Research Article |
Corresponding author: Yume Imada ( imayume.ac@gmail.com ) Academic editor: Michael Ohl
© 2018 Yume Imada, Makoto Kato.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Imada Y, Kato M (2018) Descriptions of new species of Issikiomartyria (Lepidoptera, Micropterigidae) and a new genus Melinopteryx gen. n. with two new species from Japan. Zoosystematics and Evolution 94(2): 211-235. https://doi.org/10.3897/zse.94.13748
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Micropterigidae is considered to be the sister group of all other extant Lepidoptera. In Japan, 17 species of five genera have been recorded including three endemic genera, Issikiomartyria Hashimoto, 2006, Kurokopteryx Hashimoto, 2006 and Neomicropteryx Issiki, 1931, all of which are associated with the liverwort genus Conocephalum Hill. We discovered four new species of Issikiomartyria from snowy regions in Northeastern Japan, and two new species of a new genus Melinopteryx gen. n. from the subalpine zone of the Akaishi Mountain Range. All these new taxa, I. hyperborea sp. n., I. leptobelos sp. n., I. catapasta sp. n., I. trochos sp. n., M. coruscans sp. n. and M. bilobata sp. n. are also associated with Conocephalum liverworts. Furthermore, females of I. akemiae Hashimoto, 2006 and I. plicata Hashimoto, 2006 are described here for the first time. Our extensive surveys revealed that the fine-scale endemism of Issikiomartyria restricted to the fragmented area facing the Japan Sea. Keys to Issikiomartyria species based on the adult morphology are provided.
Sea of Japan, nonglossata, Zeugloptera , bryophyte-feeding
Micropterigidae represents one of the branches in the first splitting event among extant Lepidoptera (
Micropterigidae in Japan comprise 17 described species in five genera: namely, Micropterix Hübner, 1825, Paramartyria Issiki, 1931, Neomicropteryx Issiki, 1931, Kurokopteryx Hashimoto, 2006, and Issikiomartyria Hashimoto, 2006. Micropterix is a genus distributed over the Palearctic ecozone as far as the Himalayan foothills (
All species of Japanese endemic genera, comprising at least 14 species, feed exclusively on Conocephalum Hill. liverworts and also seem to occupy similar ecological niches (
Our thorough field surveys for molecular phylogenetic analysis have revealed that the micropterigid fauna in the Northeastern Japan is unexpectedly diverse. We reveal a new genus that inhabits an elevational zone of ca. 1500–1800 m in the Akaishi Mountain Range, which is sister to Issikiomartyria in the molecular phylogenetic analysis of
In this study, males and females of four Issikiomartyria species new to science and females of two known species are described. Also, a new genus is established based on two species new to science. An updated account of the distribution of micropterigids in the northeastern Japan based on the detailed additional sampling records is provided.
Adults and larvae of micropterigid moths were collected from temperate forests in Japan, and larvae were reared in plastic cases with their host-plants. A total of 226 adult pinned specimens were used for this study. For genital dissections, the whole abdomen was removed and macerated for 30 min in 10 % KOH. Residual scales and tissues were then washed in distilled water to remove KOH, immersed in 50 % ethanol and dehydrated in an ethanol series. Genitalia were then stained with 5 % chlorazol black E for 10 min, and dehydrated in a series of 70−100 % ethanol. After washing, specimens were mounted and stored in 70 % glycerol. For some specimens, to examine the wing veins, wings were removed and scales were removed by brushing in 70 % EtOH. Observation and measurements were made under an Olympus BX53F microscope at 10–40× with the aid of a micrometer scale.
All the specimens examined in this study are deposited in the following collections: National Museum of Nature and Science (NMNS), Graduate School of Human and Environmental Studies, Kyoto University (KUHE).
Terminology follows
Melinopteryx coruscans sp. n. by present designation.
Aedeagus with three pairs of dorsal fins, a pair of lateral triangular fins, and a ventral longitudinal fin. Genital chamber with a large genital sclerite with four paddle-shaped accessory sclerites at posterior end.
The generic description is based on M. coruscans sp. n. and M. bilobata sp. n.
Head capsule densely covered by microtrichia; genal area glossy and naked; most of clypeus, frons, and vertex covered with brownish yellow piliform scales. Ocelli present. Antenna moniliform, approximately as long as forewing in male, longer than in female; densely covered with fuscous piliform scales on scape and pedicel; scape the largest segment, three times longer than most basal flagellum; pedicel small, as long as most basal flagellum. SOI (
Habitus of adult males of Melinopteryx and Issikiomartyria. A: Melinopteryx coruscans sp. n. [holotype; MC 0204]; B: M. bilobata sp. n. [holotype: MC 0221]; C: Issikiomartyria hyperborea sp. n. [holotype: MC0252]; D: I. leptobelos sp. n. [MC 0250]; E: I. catapasta sp. n. [MC 0241]; F: I. trochos sp. n. [MC 0231]
Adult heads of Melinopteryx and Issikiomartyria. A: Melinopteryx bilobata sp. n., frontal view; B: ditto, posterior view; C: Issikiomartyria hyperborea sp. n., frontal view. Abbreviations: an = antenna; cl = clypeus; dp = distal prelabium; ess = epistomal sulcus; gl = galea; la = labium; lp = labial palp; md = mandible; mp = mandibular palp; oc = ocellus; os = occipital sulcus; pp = proximal prelabium. Scale bars: 0.5 mm.
Foretibial epiphysis absent. Antero-lateral processes of pronotum present, weakly sclerotized.
Wing venation as shown in Fig.
Male abdomen and genitalia. Sternum VIII membranous. Segment IX a complete ring, well sclerotized, with a posterior expansion dorsally. Valva triangular, broadly membranous at proximo-dorsal surface, with a proximo-ventral ridge; anterior portion fused with median plate; median plate large, roughly fan-shaped. Phallobase strongly curved, without ventral longitudinal ridge. Aedeagus stout at caudal end, with three pairs of fins dorso-medially; a pair of lateral triangular fins extending horizontally; a pair of ventral fin extending vertically; dorsal apex of aedeagus acute and ventral one slightly forked, longer than dorsal one; gonopore opening horizontally; vesica with serrate minute projections. Tergum X broader than long, with a pair of long ventral plates (venter X plates) extending antero-ventrally at base of terminal processes.
Female abdomen and genitalia. Segment IX forming a complete ring, strongly sclerotized, with a dorso-lateral concavity, without lateral protrusion. Segment X composed by lateral sclerites and one or two dorsal sclerotized plates; lateral sclerites simple, broader than long, having digitate projections with an apical seta at terminal inner margin. Corpus bursae large, globular, membranous, with signa composed of three or four sclerites near caudal end. Genital chamber with a large sclerite (genital sclerite) and a few tiny sclerites; genital sclerite deeply furcated posteriorly into four paddle-shaped accessory sclerites.
The genetic distance between Melinopteryx coruscans sp. n. (labelled as ‘Issikiomartyria’ sp. in
The genus name is a compound noun derived from the Greek words transliterated into Latin, “melinos” (honey-color) and “pteryx” (wing), referring to the adult wing color of the species of this genus. The gender is feminine.
Holotype: JAPAN [HONSHU] 1♂collected by MK on 29.VII.2007 at Shirabiso-touge (1800m), Iida-shi, Nagano Pref (Fig.
Paratypes: JAPAN [HONSHU] 13♂1♀ collected by MK on 29.VII.2007 at same locality as holotype, KUHE.
Additional materials: JAPAN [HONSHU] 1♀ emerged on 9.VI.2014 from a larva collected by YI on 27.IV.2014 at same locality as holotype, KUHE; 1♂1♀ collected by MK on 13.VII.2009 at Irisawai (1115m), Ohshika-mura, Nagano Pref (Fig.
Japan, Nagano Pref: Shirabiso-touge (Honshu).
Aedeagus with a pair of ventral longitudinal fins, extending more than half of aedeagal length; female corpus bursae with two forms of signa consisting of two semicircular sclerite and a long rectangular sclerite.
Head dark brown, naked and glossy on both sides, sparsely covered with brownish yellow piliform scales with dark yellow scales on vertex. Antenna about same length of forewing in male, about 4/5 in female; with 67 (60–74) flagellomeres in males (n=7). Labial palp 2-segmented. Thorax grayish brown, sparsely covered with purple and brownish gold scales on prothorax with blue metallic scales, with dark yellow piliform scales on tegula. Forewing with brownish purple luster tinged with coppery, densely covered with golden luster over basal half of dorsum; cilia grayish brown, pale yellow on apex; ventral surface glossy grayish purple. Forewing length 5.1 mm (4.8–6.0, n=8) and 5.1 mm (n=1) in male and female, respectively. Hindwing glossy brownish purple scattered with piliform scales on basal half; cilia grayish brown; ventral surface same as forewing. Abdomen sparsely covered with grayish brown piliform scales.
Male abdomen and genitalia (Fig.
Male genitalia of Melinopteryx coruscans sp. n. [holotype]. A: genitalia capsule, dorsal view; B: phallus, dorsal view; C: ditto, lateral view; D: median plate; E: left valva, inner view; F: tergum X and venter X plate, dorsal view; G: ditto, oblique view; H: genital capsule, lateral view. Abbreviations: df =dorsal fin; ltf = lateral triangular fin; mdr = mid-dorsal ridge; vlf = ventral longitudinal fin. Scale bars: 0.2 mm.
Female abdomen and genitalia (Fig.
Female genitalia of Melinopteryx coruscans sp. n. [paratype]. A: genitalia capsule, dorsal view; B: ditto, ventral view; C: female genitalia, lateral view; D: signa; E: genital sclerite, dorsal view; F: ditto, lateral view; G: arising part of ductus spermathecae, dorsal view. Abbreviation: ds = dorsal sclerite. Scale bars: 0.2 mm.
Geographic variation is recognizable between individuals in the populations at Irisawai and Shirabiso-touge. In the populations of Irisawai, the proximal portion of the male tergum X is stouter and much more developed than that of Shirabiso-touge; wing color tinged with strongly purplish scales at Irisawai population, whereas wing color of the individuals at Shirabiso-touge tend to be more tinged with coppery and golden scales.
Melinopteryx coruscans sp. n. is distinguished from M. bilobata sp. n. based on the following character states: aedeagus with a ventral longitudinal fin extending more than half of aedeagal length; female segment X with a rectangular plate of dorsal sclerites; corpus bursae with two different forms of signa consisting of a pair of semicircular sclerites and a ribbon-shaped sclerite. This species corresponds to “ ‘Issikiomartyria’ sp.” in
The specific name is a participle in the nominative singular from the Latin word “coruscans”, which stands for flashing.
The Western mountain range of the Akaishi Mountain Range of Japan (Honshu: Nagano Pref.).
There is a single generation per year; however, there may be one generation per two years in some populations at high elevation, where larvae exhibit two significantly different size during the same period of time. The habitat is the peak or valley of sub-alpine forests at approximately 1100–1820 m of the Akaishi Mountain Range of Japan. The dominant arboreal species of their habitat are Tsuga diversifolia (Maxim.) Mast., Abies veitchii Lindl., and Picea jezoensis var. hondoensis (Mayr) Rehde (Pinaceae). The larvae feed on the thalli of Conocephalum liverworts.
Holotype: JAPAN [HONSHU] 1♂ collected by YI on 3.VII.2016 at Ikawa-touge (1559m), Tatsuno-cho, Shizuoka Pref (Fig.
Paratypes: JAPAN [HONSHU] 5♂1♀ collected by T. Kato on 10.VII.2016 at same locality as holotype, NMNS.
Additional materials: JAPAN [HONSHU] 1♂ emerged on 15.VI.2015 from larva collected by MK on 10.V.2015 at same locality as holotype, NMNS; 10♂ collected by YI on 3.VII.2016 at same locality, KUHE.
Japan, Shizuoka Pref: Ushikubi-touge (Honshu).
Aedeagus with a short ventral fin in male genitalia; female segment X with two reduced lobes of dorsal sclerite.
Head dark brown, naked and glossy on both sides, sparsely covered with brownish yellow piliform scales with dark yellow scales on vertex. Antenna slightly longer than forewing in male; with 67 (64–73) flagellomeres in males (n=8). Labial palp 2-segmented. Thorax grayish brown, sparsely covered with purple and brownish gold scales on prothorax with blue metallic scales, with dark yellow piliform scales on tegula. Legs covered with glossy fuscous scales. Forewing with brownish purple luster tinged with coppery, densely covered with golden luster over basal half of dorsum; cilia grayish brown, pale yellow on apex; ventral surface glossy grayish purple. Forewing length 4.9 mm (4.6–5.0, n=10) in male. Hindwing glossy brownish purple scattered with piliform scales on basal half; cilia grayish brown; ventral surface same as forewing. Abdomen sparsely covered with grayish brown piliform scales.
Male abdomen and genitalia (Fig.
Female abdomen and genitalia (Fig.
Female genitalia of Melinopteryx bilobata sp. n. [paratype]. A: genitalia capsule, dorsal view; B: ditto, ventral view; C: a lobe of dorsal sclerotized plate of Segment X, dorsal view; D: female genitalia, lateral view; E: genital sclerite, dorsal view; F: ditto, lateral view; G: arising part of ductus spermathecae, dorsal view. Scale bars: 0.2 mm. Abbreviation: ldsp = two lobes of dorsal sclerotized plate of segment X.
Melinopteryx bilobata sp. n. is distinguished from M. coruscans sp. n. based on the following characteristics: aedeagus with a ventral protrusion at base; female segment X with a pair of small dorsal sclerites.
The specific name is a compound adjective in the nominative singular from the Latin words, “bi-” (two) and “lobatus” (having diminutive lobes), referring to a pair of small dorsal sclerites of the female genitalia (Fig.
The Eastern mountain range of the Akaishi Mountain Range of Japan (Honshu: Shizuoka Pref.).
The larvae feed on the thalli of Conocephalum conicum (L.) Dum. The habitat is a forest path along the mountain ridge of sub-alpine or cool-temperate forests at approximately 1500 m of the Akaishi Mountain Range of Japan, where Fagus crenata Blume (Fagaceae) and Abies firma (Sieb. & Zucc.) (Pinaceae) dominate.
Neomicropteryx nudata Issiki, 1953, fixed by original designation.
Aedeagus with two pairs of dorsal fins.
The generic description is based on I. nudata (Issiki, 1953), I. akemiae, I. plicata, I. distincta Hashimoto, 2006, I. bisegmentata, I. hyperborea sp. n., I. leptobelos sp. n., I. catapasta sp. n., I. trochos sp. n., and on the previous studies on this group (
Head capsule densely covered by microtrichia, apart from genal area where glossy and naked; most of clypeus, frons, and vertex covered with brownish yellow piliform scales. Ocelli present. Antenna moniliform, approximately as long as forewing in male, longer than in female; scape the largest segment, twice longer than most basal flagellum; pedicel bulbous, larger than most basal flagellum; basal one or two flagellomeres cylindrical. SOI about 0.4. MIOI about 0.5. Interocellar sulcus almost complete. Postinterocellar sulcus distinct. Epicranial sulcus distinct between occipital foramen and postinterocellar sulcus, being as a short distance anterior to interocellar sulcus. Temporal sulcus as a darker line. Occipital sulcus almost complete, but slightly indistinct on dorso-lateral corner. Occipus fan-shaped. Mandibular teeth greatly reduced. Labial palp 1- or 2-segmented. Maxillary palp 5-segmented. Proximal prelabium obscure. Foretibial epiphysis absent. Antero-lateral processes of pronotum present, strongly sclerotized. Fore- and hindwings obtuse at apex, forewing with brown to purple luster, without any distinct maculation. Forewing with R1 unforked; R3 stalked with R4+5. Hindwing with a main stem of R absent; most anterior vein of hindwing forked near terminal end (Sc1 and Sc2 + R1). Sternum V gland present; orifice of gland a narrow slit.
Male abdomen and genitalia. Sternum VIII membranous. Segment IX a complete ring, well sclerotized, with a posterior expansion dorsally; posterior margin gradually expanded from dorsum to venter. Valva triangular, broadly membranous at inner surface, with a proximo-ventral ridge whose anterior portion fused with median plate; median plate large, roughly fan-shaped. Phallobase strongly curved, with or without longitudinal ventral ridge(s) on midline. Aedeagus with acute apex, ventrally forked slightly at caudal end; with two pairs of basal fins dorso-medially and a pair of lateral triangular fins; gonopore opening horizontally; vesica with serrate minute projections. Tergum X, broader than long, with a pair of long ventral plates (venter X plates) extending antero-ventrally at base of terminal processes.
Female abdomen and genitalia. Segment IX forming a complete ring, strongly sclerotized; anterior margin gradually expanded anteriorly from dorsum to venter; mid-dorsal length generally shorter than 2/5 of mid-ventral length; laterally protruded in some species. Segment X consisting of a pair of lateral sclerites and a dorsal sclerotized plate; lateral sclerites simple, broader than long, with digitate projections having an apical seta at terminal inner margin. Corpus bursae large, globular, membraneous, with signa composed of four sclerites. Ductus spermathecae arising from a hexagonal or round concavity. Genital chamber with small sclerite(s).
The following characters are regarded as synapomorphies of Issikiomartyia: aedeagus with two pairs of hornlike dorsal projections and without any protrusion vertically in male: sclerite in female genital chamber greatly reduced.
Holotype: JAPAN [HONSHU] 1♂ emerged on 24.V.2012 from larva collected by T. Kato on 4.V.2012 at Tairadate (240m), Sotogahama-machi, Aomori Pref (Fig.
Paratype: JAPAN [HONSHU] 1♀ emerged on 24.V.2012 from larva collected by MK on 24.V.2012 at same locality, NMNS.
Additional materials: JAPAN [HONSHU] 1♀ emerged on 24.V.2014 from larva collected by YI on 10.V.2014 at same locality, KUHE.
Japan, Aomori Pref: Tairadate (Honshu).
Aedeagus with a pair of lateral triangular fins arising from ventral margin, extending horizontally. Female segment IX with a strong concavity extending from lateral to ventral sides.
Head dark brown, naked and glossy on both sides, sparsely covered with yellow piliform scales with dark yellow scales on vertex. Antenna slightly longer than forewing in male; densely covered with fuscous piliform scales on scape and pedicel. Labial palp 1-segmented. Forewing length 3.8 mm (n=1) and 3.9 mm (n=1) in male and female.
Male abdomen and genitalia (Fig.
Female abdomen and genitalia (Fig.
Issikiomartyria hyperborea sp. n. is distinguishable from the known Issikiomartyria species by the following characters. In the male, aedeagus with a pair of latero-basal fins arising from ventral side. In the female, segment IX with a deep concavity extending from lateral to ventral sides; dorsal sclerite of segment X convex vertically in the middle.
The specific name is an adjective in the nominative singular derived from the Greek word transliterated into Latin, “hyperboreus”, indicating the mythical people of Greek mythology who lived “Beyond the North Wind”.
This species has only been found from Tsugaru peninsula of Japan (Fig.
Larvae feed on the thalli of Conocephalum conicum. The locality is a forest path along a stream in the cool-temperate forests at approximately 250 m of Tsugaru peninsula, where Fagus crenata and Quercus crispula Blume (Fagaceae) dominate.
Holotype: JAPAN [HONSHU] 1♂ collected by YI on 15.VI.2015 at Hachimori (100 m), Happo-cho, Akita Pref (Fig.
Paratype: JAPAN [HONSHU] 9♂2♀ collected by YI on 15.VI.2015 at same locality, NMNS.
Japan, Akita Pref: Hachimori (Honshu).
Apical part of valva digitiform. Tergum X longer than 3/4 of valva.
Head dark brown, naked and glossy on both sides, sparsely covered with yellow piliform scales with dark yellow scales on vertex. Antenna longer than forewing in male; with 56 (45–61) flagellomeres in males (n=5). Labial palp 1-segmented. Forewing length 4.5 mm (4.0–4.7, n=9) in male.
Male abdomen and genitalia (Fig.
Female abdomen and genitalia (Fig.
Issikiomartyria leptobelos sp. n. is unique in valva with the digitiform apex in the male. This species is most similar to I. hyperborea sp. n., but can be distinguished by the segment IX without a concavity at lateral and ventral sides in the female.
The specific name is a compound noun in apposition derived from the Greek words transliterated into Latin, “leptos” (fine) and “belos” (divine, arrow), referring to the digitiform valva of this species.
This species has only been found from Hachimori-cho (Honshu: Akita Pref).
Larvae feed on the thalli of Conocephalum conicum. The locality is a forest path along a stream in the cool-temperate forests at 100–340 m.
Holotype: JAPAN [HONSHU] 1♂ collected by YI on 21.VI.2015 at Tachimata-keikoku (620 m), Kitaakita-shi, Akita Pref (Fig.
Paratypes: JAPAN [HONSHU] 1♀ collected by YI on 13.VI.2016 at same locality as holotype (Fig.
Additional materials: JAPAN [HONSHU] 3♂ collected by YI on 21.VI.2015 at same locality as holotype, KUHE; 3♂ 1♀ collected by YI on 13.VI.2016 at same locality, KUHE; 1♂ collected by YI on 14.VI.2016 at Mt. Moriyoshi (380 m), Kitaakita-shi, Akita Pref (Fig.
Japan, Akita Pref: Tachimata-keikoku (Honshu).
Middle portion of tergum X in male undeveloped, approximately half of lateral portions. Female genital chamber with numerous sclerites at proximo-dorsally.
Head dark brown, naked and glossy on both sides, sparsely covered with yellow piliform scales with dark yellow scales on vertex. Antenna longer than forewing in male, with 60 flagellomeres in female (n=1). Labial palp 1-segmented. Forewing length 4.3 mm (4.1–4.6, n=9) in male.
Male abdomen and genitalia (Fig.
Female abdomen and genitalia (Fig.
Issikiomartyria catapasta sp. n. is most similar to I. trochos sp. n. in that lateral parts of tergum X extending dorsally, but can be distinguished by the following traits: two basal pairs of dorsal and lateral aedeagal fins closer to each other; numerous tiny sclerites scattered dorsally in female genital chamber; corpus bursae without tiny sclerites.
The specific name is a noun in the genitive singular derived from a Latin word, “catapastus” (patchwork), referring to the numerous tiny sclerites in the female genital chamber of this species (Fig.
This species has only been found from Kitaakita-shi (Honshu: Akita Pref).
Larvae feed on the thalli of Conocephalum conicum. The localities are forest paths along mountain streams of cool-temperate forests at 380–620 m, where Fagus crenata Blume (Fagaceae), Pterocarya rhoifolia Sieb. Et Zucc. (Junglandaceae) and Aesculus turbinate Blume (Sapindaceae) predominately occur.
Holotype: JAPAN [HONSHU] 1♂ collected by YI on 19.VI.2015 at Mahirudake-rindou (410 m), Nishiwaga-cho, Iwate Pref (Fig.
Paratypes: JAPAN [HONSHU] 3♂1♀ collected by YI on 19.VI.2015 at same as holotype locality, NMNS.
Additional materials: 1♂ collected by YI on 11.VI.2016 at Kodera-keikoku (580 m), Ohemachi, Yamagata Pref (Fig.
Japan, Iwate Pref: Mahirudake-rindou (Honshu).
Male tergum X with middle portion as large as lateral portions, lateral portions extending dorsally. Female corpus bursae with tiny sclerites on membrane surface near caudal end.
Head dark brown, naked and glossy on both side, sparsely covered with yellow piliform scales with dark yellow scales on vertex. Antenna longer than forewing in male; with 62 (61–65) flagellomeres in males (n= 3). Labial palp 1-segmented. Forewing length 4.4 mm (4.2–4.7, n=8) in male.
Male abdomen and genitalia (Fig.
Female abdomen and genitalia (Fig.
Female genitalia of Issikiomartyria trochos sp. n. [paratype]. A: genitalia capsule, dorsal view; B: ditto, ventral view; C: female genitalia, lateral view; D: genital sclerite; E: arising part of ductus spermathecae, dorsal view. Scale bars: 0.2 mm. Abbreviation: scg = sclerotized granules of corpus bursae.
Issikiomartyria trochos sp. n. is most similar to I. catapasta sp. n. in that lateral parts of tergum X extending dorsally, but can be distinguished by the following traits: dorso- and latero-basal aedeagal fins separated from each other; female genital chamber without small sclerites; corpus bursae with tiny sclerites on membrane surface near caudal end.
The specific name is a noun in apposition from the Greek word, “trochos” (wheel, disk), referring to the unusually extended form of tergum X of this species.
This species has been found from the northern part of the main island of Japan (Honshu: Yamagata Pref.).
Larvae feed on the thalli of Conocephalum conicum. The habitat is a forest path along mountain streams of cool-temperate forests at 340–595 m, where Fagus crenata and Quercus crispula dominate.
Issikiomartyria akemiae Hashimoto, 2006: 70, fig. 20.
Lectotype: JAPAN [HONSHU] 5♂1♀ collected by MK on 8.VI.2009 at Kiyotsu-kyo, Niigata Pref (Fig.
(based on female). Head dark brown, naked and glossy on both side, sparsely covered with yellow piliform scales with dark yellow scales on vertex. Antenna longer than forewing in male. Labial palp 1-segmented.
Female abdomen and genitalia (Fig.
I. akemiae can be distinguished by female genitalia having the ductus spermathecae forked in the middle.
Larvae feed on the thalli of Conocephalum conicum.
Issikiomartyria plicata Hashimoto, 2006: 71, fig. 21.
Lectotype: JAPAN [HONSHU] 11♂2♀ collected by MK, YI on 8.VI.2009 at Amamizukoshi (495m), Matsunoyama-cho, Niigata Pref (Fig.
Additional materials: JAPAN [HONSHU] 2♂ collected by YI on 14.V.2008 at Shimooritateurasa, Uonuma-shi, Niigata Pref (Fig.
(based on female). Head dark brown, naked and glossy on both side, sparsely covered with yellow piliform scales with dark yellow scales on vertex. Antenna longer than forewing in male. Labial palp 1-segmented.
Female abdomen and genitalia (Fig.
I. plicata can be distinguished from other species of Issikiomartyria based on the female genitalia in that having densely sclerotized zone at distal end of corpus bursae.
Larvae feed on the thalli of Conocephalum conicum.
1 | Forewing with Rl vein deeply bifurcate, except for Austromartyria porphyrodes Turner, 1932 | Southern Hemisphere genera |
– | Forewing with Rl vein unforked (rarely shallowly bifurcate as an individual variation) | (Northern Hemisphere genera)...2 |
2 | Fore- and hindwings with an acute apex; hindwing usually with a complete stem vein of Rl | Micropterix |
– | Fore- and hindwings with an obtusely round apex; hindwing with an incomplete stem vein of Rl | 3 |
3 | Head covered with yellow or orange piliform scales | 4 |
– | Head covered with black piliform scales | 8 |
4 | Foretibia with epiphysis | 5 |
– | Foretibia without epiphysis | 6 |
5 | Fore- and hindwings with a radial cell; aedeagus with about 20 to 50 minute serrate projections; female segment X without a dorsal sclerite | Paramartyria |
– | Fore- and hindwings without a radial cell; aedeagus with a few minute serrate projections; female segment X with a dorsal sclerite | Palaeomicroides Issiki, 1931 |
6 | Fore- and hindwings without a radial cell | 7 |
– | Fore-and hindwings with a radial cell | 8 |
7 | Pedicel as large as the most basal flagellum; labial palp developed, 2-segmented; aedeagus with three pairs of dorsal ridges, a pair of lateral triangular fins, a ventral longitudinal fin extended vertically | Melinopteryx gen. n. |
– | Pedicel twice as large as the most basal flagellum; labial palp weakly developed, usually 1-segmented (except for I. bisegmentata); aedeagus with two pairs of dorsal ridges and a pair of lateral triangular fins, without ventral fins | Issikiomartyria |
8 | A basal stalk of each flagellomere distinct; aedeagus divided into dorsal and ventral branches; corpus bursae large, with four distinct tridentaform signa | Epimartyria Walsingham, 1898 |
– | A basal stalk of each flagellomere distinct; aedeagus not divided; corpus bursae small, with or without four minute signa | Vietomartyria Hashimoto & Mey, 2000 |
9 | Forewing slender; valva with a costal long projection curved ventro-mesally; aedeagus without dorsal and ventral longitudinal ridges; female segment X without a dorsal sclerotized plate | Kurokopteryx |
– | Forewing rather broad and oval; valva without such a long projection; aedeagus with dorsal and ventral longitudinal ridges; female segment X with a dorsal sclerotized plate | Neomicropteryx |
1 | Valva with digitiform apex; tergum X longer than 3/4 of valva | I. leptobelos sp. n. |
– | Valva gradually tapering toward apex; tergum X shorter than 3/4 of valva | 2 |
2 | Tergum X with a pair of lateral flanges or protrusions exerted vertically; aedeagus with broad, triangular latero-basal fins | 3 |
– | Tergum X without lateral flanges; aedeagus with narrow latero-basal fins | 4 |
3 | A pair of latero-basal fins of aedeagus acute at base, arising from ventral side | I. hyperborea sp. n. |
– | A pair of latero-basal fins of aedeagus broad at base, arising from lateral side | 5 |
4 | Valva with a mid-dorsal ridge; aedeagus with a pair of lateral triangular fins at or near middle | 6 |
– | Valva without mid-dorsal ridge; aedeagus with a pair of lateral triangular fins near terminal end | I. bisegmentata |
5 | Valva with a mid-dorsal ridge; middle portion of tergum X smaller than lateral portion; dorso- and latero-basal aedeagal fins and flanges close to each other | I. catapasta sp. n. |
– | Valva without mid-dorsal ridge; middle portion of tergum X almost same size as lateral portion; dorso- and latero-basal aedeagal fins and flanges separated from each other | I. trochos sp. n. |
6 | Dorso-basal margin of valva strongly expanded posteriorly; a mid-dorsal ridge of valva a thin plate expanding ventro-mesally; dorso- and latero-basal aedeagal fins rather broadly separated from each other; lateral triangular fins of aedeagus small | I. distincta |
– | Dorso-basal margin of valva not expanded; a mid-dorsal ridge of valva either hornlike or a rather thick plate; dorso- and latero-basal aedeagal ridges close to each other; lateral triangular fins of aedeagus relatively large | 7 |
7 | A mid-dorsal ridge of valva a thick plate, rounded; phallobase without a longitudinal ventral ridge; proximo-lateral fins of aedeagus short, rather stout; medial part of tergum X broadly concave | I. nudata |
– | A mid-dorsal ridge of valva hornlike, acute ventrally; phallobase with longitudinal ventral ridges; proximo-lateral fins of aedeagus slender; medial part of tergum X not concave | 8 |
8 | Phallobase with two longitudinal short ridges running parallel each other; proximo-lateral fins of aedeagus extending antero-dorsally | I. akemiae |
– | Phallobase with a longitudinal ridge; proximo-lateral projections extending horizontally | I. plicata |
1 | Segment IX with a deep concavity on ventral side | I. hyperborea sp. n. |
– | Segment IX without concavity on ventral side | 2 |
2 | Segment IX with a dorso-lateral protrusion | 3 |
– | Segment IX without protrusion | 4 |
3 | Genital chamber with numerous small sclerites scattered; distal surface of corpus bursae smooth, without sclerotization | I. catapasta sp. n. |
– | Genital chamber without sclerites on dorsal side but with a large one on ventral side; corpus bursae densely covered with weakly sclerotized granules on distal surface | I. trochos sp. n. |
4 | Mid-dorsal length of segment IX ring shorter than 1/3 of ventral length | I. leptobelos sp. n. |
– | Mid-dorsal length of segment IX ring longer than 1/3 of ventral length | 5 |
5 | Distal zone of corpus bursae densely sclerotized | I. plicata |
– | Distal zone of corpus bursae without sclerotization | 6 |
6 | Signa composed of four reduced sclerites in corpus bursae | I. nudata |
– | Signa composed of four tridenta-form sclerites in corpus bursae | 7 |
7 | Sclerites in signa shallowly bifurcated; ductus spermathecae forked in middle | I. akemiae |
– | Sclerites in signa deeply bifurcated; ductus spermathecae without forked | I. bisegmentata |
All specimens described below are stored in KUHE.
Issikiomartyria bisegmentata Hashimoto, 2006
JAPAN [HONSHU] 2♂ collected by YI on 20.X.2013 at Aosawa tunnel, Sakata-shi, Yamagata Pref (Fig.
Issikiomartyria distincta Hashimoto, 2006
JAPAN [HONSHU] 2 larvae collected by YI on 20.V.2013 at Shirabu-onsen, Yonezawa-shi, Yamagata Pref (Fig.
Issikiomartyria nudata Hashimoto, 2006
JAPAN [HONSHU] 4♂ collected by MK on 14.VII.2009 at Renge-onsen, Otoigawa-shi, Niigata Pref (Fig.
Kurokopteryx dolichocerata Hashimoto, 2006
JAPAN [HONSHU] 4♂ collected by YI on 12.VI.2011 at Kashio, Ohshika-mura, Nagano Pref (Fig.
Neomicropteryx kazusana Hashimoto, 1992
JAPAN [HONSHU] 5♂ collected by MK on 14.V.2008 at Mt. Kiyosumi, Kamogawa-shi, Chiba Pref (Fig.
Neomicropteryx matsumurana Issiki, 1931
JAPAN [HONSHU] 1♂ emerged on 20.IV.2014 from larva collected by YI on 19.X.2013 at Nogawakeikoku, Nagai-shi, Yamagata Pref (Fig.
Paramartyria immaculatella Issiki, 1931
JAPAN [HONSHU] 5♂ collected by YI on 12.VI.2016 at Sanzugawa-keikoku, Yuzawa-shi, Akita Pref (Fig.
Our extensive field surveys have revealed that the distribution of Issikiomartyria is extended from northernmost to the central region of Honshu. Issikiomartyria species tend to be found from the geographically fragmented area facing the Japan Sea but not from the Pacific Ocean sides, although we conducted a census with considerable efforts throughout northeastern Honshu. The host-plant species is not likely to be the limiting factor of their distribution, because Conocephalum liverwort is widespread in the mainland of Japan (Imada Y and Kato M, pers. obs.). The Japan Sea side of the Japanese archipelago corresponds to the largely snow-covered area (
To our knowledge, Issikiomartyria offers a largest example of regional diversification of insects in the northeastern Japan. Especially, it should be noted that I. hyperborea sp. n. may be the only insect species endemic to the Tsugaru peninsula so far known, which can be morphologically well-differenciated from the rest of Issikiomartyria spp. Several groups of animals represent genetic variations among the geographic populations in the northeastern Japan: terrestrial animals (Suzuki et al. 2004); Carabus ground beetles (
Furthermore, we have discovered two species of Melinopteryx gen. n., M. coruscans sp. n. and M. bilobata sp. n., from highlands of the Akaishi Mountain Range. Melinopteryx gen. n. is sister to Issikiomartyria in a molecular phylogenetic analysis (
The Japanese patterns of allopatry is even more extreme than that found in New Zealand Sabatinca yet contrasts markedly with a pattern of sympatry found in New Caledonia (
We thank Toru Kato and Natsuhiko Yoshikawa for providing materials used in this study; Yoshiko Yamane, Yumiko Imada and Yasuharu Imada for supporting the field surveys; Takafumi Nakano, George Gibbs, David Lees, Donald Davis, Conrad Labandeira for valuable comments for the previous manuscripts. This study was partly supported by JSPS KAKENHI Grant Numbers, 14J00160, 15H02420, and Yoshida Scholarship Foundation.