Research Article |
Corresponding author: Rainer Günther ( rainer.guenther@mfn-berlin.de ) Academic editor: Johannes Penner
© 2017 Rainer Günther, Stephen Richards.
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:
Günther R, Richards S (2017) Three new species of the microhylid frog genus Choerophryne (Amphibia, Anura, Microhylidae) from Papua New Guinea. Zoosystematics and Evolution 93(2): 265-279. https://doi.org/10.3897/zse.93.11576
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We describe three new species of the microhylid frog genus Choerophryne from the mountains and foothills of southern and northeastern Papua New Guinea. All three species lack elongated snouts and all are arboreal calling from elevated perch sites between ~1 and 10 m above the forest floor. Advertisement calls and habitat preferences are described for each species. Descriptions of these three frogs brings the total number of Choerophryne recognized to 34 but numerous additional species undoubtedly remain to be discovered in poorly-surveyed mountainous regions of New Guinea.
New Guinea, taxonomy, frogs, Gulf Province, Southern Highlands Province, Huon Peninsula
The microhylid genus Choerophryne Kampen, 1914 currently contains 31 species of small (SUL < 30 mm), terrestrial or arboreal frogs (
Here we describe three new species of Choerophryne lacking elongated snouts, two from the southern slopes of Papua New Guinea’s central cordillera and one from the mountains of the Huon Peninsula in northern Papua New Guinea. There is no doubt that many species of this moderately diverse genus remain to be discovered and described from the large areas of mountainous terrain in New Guinea that remain incompletely surveyed.
Male frogs were collected at night after they were located by their advertisement calls. Representative specimens were photographed in life, and all specimens were anaesthetised in an aqueous chlorobutanol solution next day and subsequently fixed in 5% formalin. Liver samples were taken from some specimens before fixation, and stored in 95% ethanol to enable later DNA sequencing. All specimens were transferred to 70% ethanol within two days of fixation. The following measurements were taken with a digital caliper (> 10 mm) or with a binocular dissecting microscope fitted with an ocular micrometer (< 10 mm) to the nearest 0.1 mm from preserved specimens only:
SUL snout-urostyle length from tip of snout to distal tip of urostyle bone; SUL is generally slightly shorter than snout-vent length (SVL). As the measurement error is higher in the latter, we prefer to use the former. Both measurements are sufficiently similar (unpublished data) that, where relevant, we compare our SUL measurements with SVL’s presented for members of the genus in some papers;
TL tibia length: external distance between knee and ankle
TaL length of tarsus: external distance between tibio-tarsal and heel joints held at right angles;
T4L length of 4th toe: from tip of toe to proximal end of inner metatarsal tubercle;
T4D transversal diameter of disc of 4th toe;
T1D transversal diameter of disc of first toe;
F3L length of 3rd finger;
F3D transversal diameter of disc of 3rd finger;
F1D transversal diameter of disc of first finger;
HL head length, from tip of snout to posterior margin of tympanum;
HW head width, taken in the region of the tympana;
SL snout length, from an imaginary line connecting the centres of the eyes to tip of the snout;
END distance from anterior corner of orbital opening to centre of naris;
IND internarial distance between centres of nares;
ED eye diameter, from anterior to posterior corner of orbital opening;
TyD horizontal diameter of tympanum.
Advertisement calls were recorded under natural conditions with a Sony Pro-Walkman or a Sony TCM 5000EV tape recorder and a Sennheiser ME66 Microphone with K6 power module, and analysed with Avisoft-SAS Lab Pro software. Air temperatures adjacent to calling males were recorded using a rapid-reading digital thermometer.
Type material of Choerophryne species examined for this study, including species previously included in Albericus, is listed in
Abbreviations of collections:
A species of the genus Choerophryne lacking an elongated snout. Snout-urostyle length in males (n=5) from 13.4–17.3 mm (mean 14.7±1.58 mm). No webs between fingers or toes; fifth toe longer than third; finger discs wider than toe discs (ratio T4D/F3D 0.78–0.88); shanks short (TL/SUL 0.38–0.44). Eyes medium sized (ED/SUL 0.110–0.127), eye-naris distance greater than internarial distance (END/IND 1.00–1.25). Dorsum with a brown hour-glass mark that has an approximately median constriction; and a pale cross with a definite posterior ‘extension’ on head. Dorsal surfaces covered with tubercles in life, lower surface smooth and brown with numerous whitish dots, inguinal region yellowish. Advertisement call a series of musical clicks sounding like ‘tink-tink-tink…’ lasting 1.01–4.75 s and containing 5–22 clicks (notes) per call at a repetition rate of 4.39–5.18 notes/s. Dominant frequency is at 5.5 kHz.
Adult male with a SUL of 14.9 mm. Additional measurements and ratios are listed in Table
Body measurements and body ratios of the type series of Choerophryne crucifer sp. n.
Reg.-No. |
|
|
|
|
|
Mean±SD |
---|---|---|---|---|---|---|
SUL | 13.4 | 13.8 | 13.9 | 17.3 | 14.9 | 14.7±1.580 |
TL | 5.3 | 5.7 | 6.1 | 7.0 | 6.5 | |
TaL | 3.7 | 3.5 | 3.9 | 4.7 | 4.5 | |
T4L | 4.9 | 4.8 | 5.4 | 5.6 | 5.5 | |
T4D | 0.7 | 0.7 | 0.7 | 0.9 | 0.7 | |
T1D | 0.6 | 0.6 | 0.6 | 0.9 | 0.5 | |
F3L | 3.6 | 3.9 | 4.2 | 4.0 | 4.2 | |
F3D | 0.8 | 0.8 | 0.9 | 1.1 | 0.8 | |
F1D | 0.5 | 0.5 | 0.5 | 0.7 | 0.5 | |
HL | 4.0 | 3.7 | 3.6 | 5.5 | 3.7 | |
HW | 4.5 | 4.6 | 4.9 | 5.8 | 5.1 | |
END | 1.1 | 1.1 | 1.2 | 1.5 | 1.5 | |
IND | 1.0 | 1.1 | 1.0 | 1.3 | 1.2 | |
SL | 2.1 | 2.0 | 2.3 | 2.8 | 2.5 | |
ED | 1.7 | 1.6 | 1.6 | 1.9 | 1.8 | |
TyD | 0.5 | 0.5 | 0.4 | 0.7 | 0.6 | |
TL/SUL | 0.40 | 0.41 | 0.44 | 0.38 | 0.44 | 0.41±0.026 |
TaL/SUL | 0.28 | 0.25 | 0.28 | 0.27 | 0.30 | 0.28±0.018 |
T4L/SUL | 0.37 | 0.35 | 0.39 | 0.32 | 0.37 | 0.36±0.026 |
T4D/SUL | 0.052 | 0.051 | 0.050 | 0.052 | 0.047 | 0.050±0.002 |
F3L/SUL | 0.27 | 0.28 | 0.30 | 0.23 | 0.28 | 0.27±0.026 |
F3D/SUL | 0.060 | 0.058 | 0.065 | 0.064 | 0.054 | 0.060±0.004 |
T4D/F3D | 0.88 | 0.88 | 0.78 | 0.82 | 0.88 | 0.85±0.046 |
T1D/F1D | 1.20 | 1.20 | 1.20 | 1.29 | 1.00 | 1.18±0.107 |
HL/SUL | 0.30 | 0.27 | 0.26 | 0.32 | 0.25 | 0.28±0.029 |
HW/SUL | 0.34 | 0.33 | 0.35 | 0.34 | 0.34 | 0.34±0.007 |
HL/HW | 0.89 | 0.80 | 0.73 | 0.95 | 0.73 | 0.82±0.098 |
END/IND | 1.10 | 1.00 | 1.20 | 1.15 | 1.25 | 1.14±0.096 |
ED/SUL | 0.127 | 0.116 | 0.115 | 0.110 | 0.121 | 0.118±0.006 |
TyD/SUL | 0.037 | 0.036 | 0.029 | 0.040 | 0.040 | 0.036±0.005 |
TyD/ED | 0.29 | 0.31 | 0.25 | 0.37 | 0.33 | 0.31±0.045 |
SL/SUL | 0.157 | 0.145 | 0.165 | 0.162 | 0.168 | 0.159±0.009 |
(Fig.
Based on paratype
Measurements and body ratios of the type specimens are presented in Table
All records of Choerophryne crucifer are from lowland and foothill forest in south-central Papua New Guinea, at altitudes ranging from ~100 m in the lowlands and foothills of Gulf Province to nearly 1,000 m asl on Iagifu Ridge in Southern Highlands Province. Males called at night from the upper surfaces of leaves, generally between 2–10 m above the forest floor.
The advertisement call of the new species, recorded at air temperatures of 23.2–24.0 °C, consists of a series, or ‘train’ of rather musical clicks (Fig.
The specific epithet crucifer is a Latin substantive in apposition and means carrier (porter) of a cross. It refers to the conspicuous yellowish cross on the head of most specimens.
With its short snout Choerophryne crucifer differs from all twelve Choerophryne with an elongated snout and would have been placed in the genus Albericus in the former sense. According to
Choerophryne gudrunae has longer legs (TL/SVL 0.44–0.46 vs. 0.38–0.44) and a higher ratio of END/IND (1.20–1.50 vs. 1.00–1.25) than C. crucifer. The advertisement calls of the former consist of about 10 clicks, those of C. crucifer of 13 on average. Dominant frequency of gudrunae-calls is at 3.5 kHz, of crucifer-calls at 5.5 kHz.
Choerophryne gunnari has longer legs (TL/SVL 0.44–0.51), a higher ratio END/IND (1.25–1.45) and conspicuous blue pigmentation on the belly and hind limbs (absent in C. crucifer). Note repetition rate of the advertisement call of C. gunnari is, according to the spectrograms published by
Choerophryne sanguinopicta occurs at elevations of >1,400 m asl (vs. lowlands and foothills <1000 m asl) and exhibits an extraordinary polychromatic colouration (absent in C. crucifer). Moreover its advertisement calls are very long series (several minutes) of clicks with a note (= call) repetition rate of less than three calls/s and a dominant frequency of around 4.0 kHz (vs. shorter series of clicks, each series lasting less than 4 seconds and with a repetition rate of more than 4.4 per second and a higher dominant frequency (at 5.5 kHz) in C. crucifer).
Choerophryne valkuriarum generally occurs at elevations over 2000 m asl (vs. <1000 m asl in C. crucifer). According to
Choerophryne variegata is known from a single specimen, and its advertisement call is unknown. According to measurements by
A species of the genus Choerophryne lacking an elongated snout. Snout-urostyle length in males (n=7) from 14.0–15.2 mm (mean 14.4±0.45 mm). No webs between fingers or toes; fifth toe longer than third; finger discs wider than toe discs (ratio T4D/F3D 0.67–0.89); shanks medium-length (TL/SUL 0.43–0.47). Eyes fairly large (ED/SUL 0.126–0.143), eye-naris distance greater than internarial distance (END/IND 1.00–1.17). Almost all specimens with a yellowish (whitish in preservative) interocular stripe, an irregular longitudinal mark of the same colour in the scapular region and a narrow streak between corner of the mouth and tympanum. No brown hour-glass mark on dorsum and no light cross on head. Best diagnostic character is the advertisement call: a rattle of 0.7–1.0 s duration with a dominant frequency of 3.5 kHz.
Adult male with a SUL of 14.9 mm. Additional measurements and ratios are listed in Table
Body measurements and body ratios of the type series of Choerophryne multisyllaba sp. n.
Reg.-No |
|
|
|
|
|
|
|
Mean±SD |
---|---|---|---|---|---|---|---|---|
SUL | 14.2 | 14.3 | 14.1 | 14.9 | 15.2 | 14.3 | 14.0 | 14.4±0.45 |
TL | 6.2 | 6.3 | 6.0 | 6.5 | 7.0 | 6.7 | 6.1 | |
Tal | 4.3 | 4.4 | 4.3 | 4.5 | 4.8 | 4.5 | 4.4 | |
T4L | 5.7 | 5.5 | 5.8 | 5.5 | 6.2 | 5.4 | 5.2 | |
T4D | 0.8 | 0.9 | 0.7 | 0.8 | 1.0 | 0.7 | 0.8 | |
T1D | 0.7 | 0.7 | 0.6 | 0.7 | 0.9 | 0.7 | 0.7 | |
F3L | 4.3 | 4.5 | 4.4 | 4.5 | 4.6 | 4.2 | 4.0 | |
F3D | 1.2 | 1.1 | 0.9 | 1.2 | 1.3 | 1.0 | 0.9 | |
F1D | 0.6 | 0.7 | 0.6 | 0.7 | 0.9 | 0.7 | 0.7 | |
HL | 4.4 | 4.3 | 4.4 | 5.0 | 4.5 | 4.5 | 4.2 | |
HW | 5.7 | 5.4 | 5.3 | 5.8 | 5.7 | 5.5 | 5.6 | |
END | 1.4 | 1.4 | 1.4 | 1.5 | 1.4 | 1.4 | 1.3 | |
IND | 1.4 | 1.3 | 1.2 | 1.3 | 1.3 | 1.2 | 1.3 | |
SL | 2.4 | 2.3 | 2.5 | 2.5 | 2.7 | 2.3 | 2.2 | |
ED | 2.0 | 1.8 | 2.0 | 1.9 | 2.0 | 2.0 | 2.0 | |
TyD | 0.8 | 0.7 | 0.8 | 0.8 | 0.6 | 0.6 | 0.7 | |
TL/SUL | 0.44 | 0.44 | 0.43 | 0.44 | 0.46 | 0.47 | 0.44 | 0.45±0.013 |
TaL/SUL | 0.30 | 0.31 | 0.30 | 0.30 | 0.32 | 0.31 | 0.31 | 0.31±0.007 |
T4L/SUL | 0.40 | 0.38 | 0.41 | 0.37 | 0.41 | 0.38 | 0.37 | 0.39±0.018 |
T4D/SUL | 0.056 | 0.063 | 0.050 | 0.054 | 0.066 | 0.049 | 0.057 | 0.056±0.006 |
F3L/SUL | 0.30 | 0.31 | 0.31 | 0.30 | 0.30 | 0.29 | 0.29 | 0.30±0.008 |
F3D/SUL | 0.085 | 0.077 | 0.064 | 0.081 | 0.086 | 0.070 | 0.064 | 0.075±0.009 |
T4D/F3D | 0.67 | 0.82 | 0.88 | 0.67 | 0.77 | 0.70 | 0.89 | 0.77±0.095 |
T1D/F1D | 1.17 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.02±0.064 |
HL/SUL | 0.31 | 0.30 | 0.31 | 0.34 | 0.30 | 0.31 | 0.30 | 0.31±0.014 |
HW/SUL | 0.40 | 0.38 | 0.38 | 0.39 | 0.38 | 0.38 | 0.40 | 0.39±0.009 |
HL/HW | 0.77 | 0.80 | 0.83 | 0.86 | 0.79 | 0.82 | 0.75 | 0.80±0.037 |
END/IND | 1.00 | 1.08 | 1.17 | 1.15 | 1.08 | 1.17 | 1.00 | 1.09±0.074 |
ED/SUL | 0.141 | 0.126 | 0.142 | 0.128 | 0.132 | 0.140 | 0.143 | 0.136±0.007 |
TyD/SUL | 0.056 | 0.049 | 0.057 | 0.054 | 0.039 | 0.042 | 0.050 | 0.050±0.007 |
TyD/ED | 0.40 | 0.39 | 0.40 | 0.42 | 0.30 | 0.30 | 0.35 | 0.37±0.050 |
SL/SUL | 0.169 | 0.161 | 0.177 | 0.168 | 0.178 | 0.161 | 0.157 | 0.167±0.008 |
Colour of holotype in life unknown. In preservative ground colour of dorsal surfaces of head, body, upper arm, forearm, thigh and shank light-grey, that of hands and feet yellowish. All dorsal surfaces more or less densely dotted with tiny dark brown dots: less so on hands, feet, between eyes, on tibiotarsal joint and on sacral region continued on to thighs; more so on all other dorsal surfaces. A scarcely visible pale interocular stripe and a pale, irregular stripe(s) in the scapular region; a similarly inconspicuous pale, irregular stripe along the upper flanks and a pale lumbar “eye-spots” (Fig.
Morphological variation in the paratypes. Measurements and body ratios of the type specimens are presented in Table
Colour in preservative of the type series: The pale inter-ocular stripe is more strongly expressed in the paratypes than in the holotype. The pale and irregularly shaped longitudinal line in the scapular region is also more strongly developed in most paratypes, and in some specimens it reaches the inguinal region. Ground colour of the dorsal surfaces in all specimens is off-white. Tiny, clearly demarcated brown dots are distributed on all dorsal surfaces. These dots form clusters of small circles on various body parts. In addition there are light or dark brown spots of different shape on various parts of the dorsal and lateral surfaces. Paler areas occur mostly on the snout, extremities, sacral region and upper flanks. Ground colour of ventral surfaces is also off-white and covered by many tiny brown dots. Their distribution ventrally is more homogenous than on dorsal surfaces, and larger spots are rare. Small and inconspicuous white spots occur on ventral surfaces of all specimens.
Tubercles are generally few and inconspicuous on dorsal surfaces but more conspicuous on flanks. Striking in all specimens studied is a tubercle directly behind the angle of the jaw and several tubercles in the postocular region.
Colour in life of two paratypes (
Choerophryne multisyllaba is currently known from two locations: the vicinity of the type locality at elevations between about 1,300–1,400 m asl on Iagifu Ridge in the Agogo Range, Southern Highlands Province, and at 1,600 m asl at Sawetau Camp in the Muller Range, Western Province (05°39.397’S, 142°18.277’E;
Forty-six calls from the male holotype (
The specific epithet multisyllaba is a Latin feminine adjective meaning polysyllabic and refers to the polysyllabic advertisement call.
With its short snout Choerophryne multisyllaba differs from all twelve Choerophryne with an elongated snout. Most short-snouted Choerophryne utter buzzing, squeaking or clicking advertisement calls. Choerophryne multisyllaba is the first whose call sounds like a rattle (similar to the rattle calls of various Oreophryne-species).
Choerophryne crucifer differs significantly from C. multisyllaba in the following body ratios: HW/SUL (p=0.005), ED/SUL (p=0.009), TyD/SUL (p=0.015), T1D/F1D (p=0.018) and F3D/SUL (p=0.022). Moreover, note repetition rate ranges from 4.4 to 5.2/s in the former and from 21 to 31 notes/s in the latter.
Choerophryne gudrunae has a higher ratio END/IND than C. multisyllaba (1.20–1.50 vs. 1.00–1.17). The advertisement call of the former consists of about 10 clicks, those of the new species of 18–23. Note repetition rate in C. gudrunae is about 5 notes/s and in C. multisyllaba of more than 20 notes/s.
Choerophryne gunnari has a higher ratio END/IND (1.25–1.45 vs. 1.00–1.17) and conspicuous blue pigmentation on the belly and hind limbs, which is absent in C. multisyllaba. Note repetition rate of the advertisement call of C. gunnari is, according to the spectrograms published by
Choerophryne sanguinopicta is larger than C. multisyllaba (SVL 15.4–17.4 mm vs. SUL 14.0–15.2 mm); its dorsum has a pale blue or green ground colour (off-white in C. multisyllaba) and its advertisement call is a very long series (several minutes) of clicks with a note (=call) repetition rate of less than three calls/s and a dominant frequency of around 4.0 kHz vs. much shorter series of clicks (each series lasting less than one second) with a repetition rate of more than 20 notes per second and a lower dominant frequency (at 3.5 kHz) in C. multisyllaba.
Choerophryne valkuriarum has shorter shanks (TL/SVL 0.37–0.44 vs. 0.43–0.47 in C. multisyllaba) and strongly different advertisement calls.
Choerophryne variegata is known from a single specimen and its advertisement call is unknown. According to measurements by
This new species differs by its polysyllabic calls clearly from the next new species which utters disyllabic calls.
A species of the genus Choerophryne lacking an elongated snout. Snout-urostyle length in males (n=10) from 14.2–17.4 mm (mean 15.4±0.94 mm). No webs between fingers or toes; fifth toe longer than third; finger discs wider than toe discs (ratio T4D/F3D 0.70–0.89); shanks short (TL/SUL 0.36–0.42). Eyes medium sized (ED/SUL 0.115–0.141), eye-naris distance about same as internarial distance (END/IND 0.86–1.25). A brown hour-glass mark present on dorsum, with anterior part of mark much smaller than posterior part. Dorsal surfaces covered with scattered tubercles in life but these become inconspicuous or are absent in preservative. Lower surfaces smooth with a mixture of small brown dots and larger brown spots on a yellow-grey background, throat more strongly pigmented than remaining ventral surfaces. Advertisement calls consist generally of two short but clearly pulsed notes produced in long series, a call structure that is unique for short-snouted species in the genus Choerophryne. Dominant frequency is at 3.5 kHz.
Adult male with a SUL of 14.4 mm. Additional measurements and ratios are listed in Table
Body measurements and body ratios of the type series of Choerophryne bisyllaba sp. n.
Reg.-No |
|
|
|
|
|
|
|
|
|
|
|
Mean±SD |
---|---|---|---|---|---|---|---|---|---|---|---|---|
SUL | 14.4 | 15.1 | 15.2 | 16.0 | 15.7 | 14.5 | 17.4 | 15.2 | 14.2 | 15.4 | 15.7 | 15.4±0.94 |
TL | 5.7 | 6.2 | 5.9 | 6.4 | 5.8 | 5.2 | 6.4 | 6.4 | 5.6 | 6.4 | 6.0 | |
TaL | 3.6 | 4.1 | 4.0 | 4.5 | 3.8 | 4.0 | 4.4 | 4.4 | 4.7 | 5.2 | 5.5 | |
T4L | 5.0 | 5.2 | 4.9 | 5.5 | 5.1 | 4.8 | 5.7 | 5.4 | 4.7 | 5.2 | 5.5 | |
T4D | 0.8 | 0.8 | 0.7 | 0.8 | 0.7 | 0.7 | 0.8 | 0.8 | 0.7 | 0.8 | 0.9 | |
T1D | 0.6 | 0.6 | 0.5 | 0.5 | 0.5 | 0.4 | 0.7 | 0.6 | 0.5 | 0.6 | 0.7 | |
F3L | 3.6 | 3.5 | 3.5 | 4.5 | 3.7 | 3.6 | 4.3 | 4.1 | 3.4 | 3.9 | 4.4 | |
F3D | 0.9 | 0.9 | 0.8 | 1.0 | 1.0 | 0.8 | 1.0 | 0.9 | 0.9 | 1.0 | 1.0 | |
F1D | 0.5 | 0.6 | 0.5 | 0.5 | 0.6 | 0.5 | 0.6 | 0.5 | 0.5 | 0.6 | 0.5 | |
HL | 4.7 | 5.1 | 4.7 | 5.4 | 5.2 | 4.9 | 5.4 | 4.8 | 4.5 | 5.1 | 5.0 | |
HW | 5.7 | 6.0 | 5.7 | 6.1 | 5.8 | 5.5 | 6.3 | 5.5 | 5.3 | 6.2 | 5.7 | |
END | 1.2 | 1.4 | 1.5 | 1.7 | 1.4 | 1.3 | 1.5 | 1.4 | 1.2 | 1.4 | 1.2 | |
IND | 1.3 | 1.4 | 1.2 | 1.6 | 1.2 | 1.4 | 1.4 | 1.3 | 1.3 | 1.4 | 1.4 | |
SL | 2.5 | 2.3 | 2.3 | 2.7 | 2.4 | 2.2 | 2.5 | 2.3 | 2.2 | 2.5 | 2.5 | |
ED | 1.9 | 2.1 | 2.0 | 2.1 | 2.0 | 1.8 | 2.0 | 1.9 | 2.0 | 2.0 | 2.0 | |
TyD | 0.8 | 0.9 | 0.8 | 1.0 | 0.8 | 0.7 | 0.8 | 0.7 | 0.8 | 1.0 | 0.8 | |
TL/SUL | 0.40 | 0.41 | 0.39 | 0.40 | 0.37 | 0.36 | 0.37 | 0.42 | 0.39 | 0.42 | 0.38 | 0.39±0.020 |
TaL/SUL | 0.25 | 0.27 | 0.26 | 0.28 | 0.24 | 0.28 | 0.25 | 0.29 | 0.28 | 0.27 | 0.27 | 0.27±0.016 |
T4L/SUL | 0.35 | 0.34 | 0.32 | 0.34 | 0.32 | 0.33 | 0.33 | 0.36 | 0.33 | 0.34 | 0.35 | 0.34±0.013 |
T4D/F3D | 0.056 | 0.053 | 0.046 | 0.050 | 0.045 | 0.048 | 0.046 | 0.053 | 0.049 | 0.052 | 0.057 | 0.050±0.004 |
F3L/SUL | 0.25 | 0.23 | 0.23 | 0.28 | 0.24 | 0.25 | 0.25 | 0.27 | 0.24 | 0.25 | 0.28 | 0.25±0.018 |
F3D/SUL | 0.063 | 0.060 | 0.053 | 0.063 | 0.064 | 0.055 | 0.057 | 0.059 | 0.063 | 0.065 | 0.064 | 0.061±0.004 |
T4D/F3D | 0.89 | 0.89 | 0.88 | 0.80 | 0.70 | 0.88 | 0.80 | 0.89 | 0.78 | 0.80 | 0.70 | 0.82±0.073 |
T1D/F1D | 1.20 | 1.00 | 1.00 | 1.00 | 0.83 | 0.80 | 1.17 | 1.20 | 1.00 | 1.00 | 1.40 | 1.05±0.170 |
HL/SUL | 0.33 | 0.34 | 0.31 | 0.34 | 0.33 | 0.34 | 0.31 | 0.32 | 0.32 | 0.33 | 0.32 | 0.33±0.011 |
HW/SUL | 0.40 | 0.40 | 0.38 | 0.38 | 0.37 | 0.38 | 0.36 | 0.36 | 0.37 | 0.40 | 0.36 | 0.38±0.016 |
HL/HW | 0.82 | 0.85 | 0.82 | 0.88 | 0.90 | 0.89 | 0.86 | 0.87 | 0.85 | 0.82 | 0.88 | 0.86±0.029 |
END/IND | 0.92 | 1.00 | 1.25 | 1.06 | 1.17 | 0.93 | 1.07 | 1.08 | 0.92 | 1.00 | 0.86 | 1.02±0.120 |
ED/SUL | 0.132 | 0.139 | 0.132 | 0.131 | 0.127 | 0.124 | 0.115 | 0.125 | 0.141 | 0.130 | 0.127 | 0.129±0.007 |
TyD/SUL | 0.056 | 0.060 | 0.053 | 0.063 | 0.051 | 0.048 | 0.046 | 0.046 | 0.056 | 0.065 | 0.051 | 0.054±0.007 |
TyD/ED | 0.42 | 0.43 | 0.40 | 0.48 | 0.48 | 0.39 | 0.40 | 0.37 | 0.40 | 0.50 | 0.40 | 0.42±0.043 |
SL/SUL | 0.174 | 0.152 | 0.151 | 0.169 | 0.153 | 0.152 | 0.144 | 0.151 | 0.155 | 0.162 | 0.159 | 0.157±0.009 |
(Fig.
Measurements and body ratios of the type specimens are presented in Table
Colour images taken in life are available for three individuals from the type series, but we are unable to assign them to specific vouchered specimens. Two of these individuals are shown in Figs
Choerophryne bisyllaba is currently known only from two locations at elevations between 2,200 and 2,400 m asl in the mountains of the Huon Peninsula, Morobe Province, north-eastern Papua New Guinea (Fig.
Map showing collection localities of three new Choerophryne species. Symbols in white are type localities, those in black represent additional collection localities. Squares = C. crucifer; circles = C. multisyllaba; diamonds = C. bisyllaba. Elevation data are based on 30 m LiDAR Digital Elevation Model (DEM) data from ASTER GDEM v2 (product of METI and NASA).
The advertisement call of C. bisyllaba normally consists of two notes that are uttered in long series lasting up to several minutes (Fig.
The specific epithet bisyllaba is a feminine Latin adjective (in accordance with the feminine genus name) and means disyllabic. It refers to the advertisement call of the species which consists predominantly of two notes (or syllables).
With its short snout Choerophryne bisyllaba differs from all Choerophryne with an elongated snout. According to
Choerophryne variegata is known from a single specimen, and its advertisement call is unknown. According to measurements by
SJR is grateful to World Wide Fund for Nature-PNG for their support of field work in Gulf and Southern Highlands Provinces, and to the Tree Kangaroo Conservation Project for support of field work in Morobe Province. Jim Robins of the PNG National Research Institute and Barnabas Wilmott of the PNG Department of Environment and Conservation (now Conservation and Environment Protection Authority) provided relevant visas and export approvals. Carolyn Kovach and Mark Hutschinson provided assistance and support at the South Australian Museum, Adelaide. We are grateful to Lukas Kirschey (