Research Article |
Corresponding author: Azman bin Abdul Rahim ( abarahim@gmail.com ) Academic editor: Kristina von Rintelen
© 2020 NurFara-Syakira binti Feirulsha, Azman bin Abdul Rahim.
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:
Feirulsha N-S, Abdul Rahim A (2020) A new species of Pereionotus (Amphipoda, Senticaudata, Phliantidae) from Pulau Tinggi, Sultan Iskandar Marine Park, Malaysia. Zoosystematics and Evolution 96(1): 195-203. https://doi.org/10.3897/zse.96.50744
|
A new species of Pereionotus Spence Bate & Westwood, 1861 from Pulau Tinggi, Sultan Iskandar Marine Park (SIMP) is described and the first record of the genus from Malaysia. It was collected from Kg. Tg. Balang, Pulau Tinggi, Johor, Malaysia (2°16'59.5"N, 104°07'21.9"E) and can be distinguished by having wide and dorsally truncate carinae of pereonites 2–7, maxillipedal palp as long as the outer plate, lacking additional robust seta in the middle of propodi of pereopods 1–4, and the absence of short robust setae on the anterodistal corner of merus and carpus of pereopods 6–7. An updated identification key for the 11 known species in the genus is also presented.
Johor, Malaysia, new species, Pereionotus tinggiensis sp. nov., Phliantidae, Pulau Tinggi, Sultan Iskandar Marine Park, taxonomy
Phliantid amphipods resemble isopods due to their dorsoventral depression body feature (
Sultan Iskandar Marine Park (SIMP), or formerly known as the East Johor Island Archipelago (EJIA), is situated off the east coast of Johor, Malaysia, in the South China Sea. The park comprises 13 small islands off Mersing, Johor, namely Pulau Harimau, Pulau Mensirip, Pulau Goal, Pulau Tengah, Pulau Hujung, Pulau Rawa, Pulau Sibu, Pulau Tinggi, Pulau Mentinggi, Pulau Sibu Hujong, Pulau Pemanggil, Pulau Besar, and Pulau Aur. Pulau Tinggi is about 30 km southeast of Mersing and has an area of about 16 km2. Ongoing faunistic investigations of the SIMP, especially at Pulau Tinggi, have yielded over 10 new crustacean taxa, belonging to Mysida, Amphipoda, and Isopoda (e.g.,
The materials collected contain only female specimens (three individuals), collected in the rocky intertidal zone of Kg. Tg. Balang, Pulau Tinggi, Johor, (Fig.
(based on
Holotype, female, 2 mm, UKMMZ–1603, Kg. Tg. Balang, Pulau Tinggi, Johor, Malaysia, 2°16'59.5"N, 104°07'21.9"E (DMS), intertidal zone, by washing intertidal rock, Hazmi, Melvin & Azman, 31 August 2016. Paratypes, 3 specimens (2 females, 1 juvenile), UKMMZ–1604, same data as for holotype.
Pereionotus contains 11 species: P. alaniphlias (J. L. Barnard 1970); P. dieteri Coleman & Lowry, 2012; P. hartmuti Coleman & Lowry, 2012; P. hirayamai Coleman & Lowry, 2012; P. holmesi (Gurjanova, 1938); P. japonicus (Tzvetkova, 1968); P. natalensis (K. H. Barnard, 1940); P. testudo (Montagu, 1808); P. thomsoni (Stebbing, 1899); P. tinggiensis sp. nov.; P. yongensis Coleman & Lowry, 2012.
Dorsal keel consisting of subequal evenly rising dorsal humps on pereonites 2–7. Antenna 1 robust with subterminal lateral lobe. Coxae 1–4 with sparse long setae on the distal margin. Propodi of pereopods 6 and 7 without additional robust setae on the anterodistal corner of merus and carpus.
Based on holotype female, 2 mm. Body (Fig.
Antenna 1 (Fig.
Upper lip missing. Lower lip (Fig.
Coxae 1–4 with sparse setae on the distal margin.
Pereopod 1 (Fig.
Pleopod 1 (Fig.
Pereionotus tinggiensis sp. nov. shares the diagnostic characters of the genus: body depressed dorsoventrally; coxal plates 1–4 not strongly splayed; maxilla 1 with scale-like inconspicuous palp; maxilla 2 with basally fused palp; maxillipedal palp 3-articulate; basis of pereopods 5 and 6 wide, rounded and ventrally expanded; slightly shortened inner ramus of pleopods 3; uropod 2 uniramous (female), and uropod 3 lacking rami.
The new species shows significant differences from other known species of Pereionotus. However, Pereionotus tinggiensis sp. nov. appears to have some similarities to the neighbouring Australian species, namely P. dieteri, P. hartmuti, P. thomsoni, and P. yongensis. Nonetheless, certain distinct characters were observed, including, i) the presence of additional robust seta half-way on the posterior margin of propodi of pereopods 1–4 and, ii) similar robust setae on the anterior margin of the propodi of pereopods 5–7, distinguishing P. tinggiensis sp. nov. from P. thomsoni. Besides, P. hartmuti and P. yongensis were found to exhibit a dense fringe of long slender setae on the distal margin of coxa 1–4. This unique characteristic is lacking in P. tinggiensis sp. nov. The new species is similar to P. dieteri in having robust subterminal lateral lobe of peduncular article 1 of antenna 1; not having additional robust seta half-way on the posterior margin of propodi of pereopods 1–4; and lacking robust seta on the anterior margin of the propodi of pereopods 1–7, but can be distinguished from P. dieteri by the absence of one or two short robust setae on the anterodistal corner of merus and carpus of pereopods 6 and 7.
This species is named after the type locality, Pulau Tinggi, Johor, Malaysia.
1 | Propodi of pereopods 1–4 with additional robust seta halfway on the posterior margin and similar robust seta on the anterior margin on propodi of pereopods 5–7 | P. thomsoni (Stebbing, 1899) |
– | Propodi of pereopods 1–7 without additional robust seta halfway on the posterior and anterior margin | 2 |
2 | Pereonites 1–7 with lateral bulges just above coxae | P. alaniphlias (J. L. Barnard, 1940) |
– | Pereonites 1–7 without lateral bulges just above coxae | 3 |
3 | Dorsal keel humps on pereonites 3 and 4 shorter than preceding pereonites | P. hartmuti Coleman & Lowry, 2012 |
– | Dorsal keel consist of subequal evenly rising dorsal humps on pereonites 2–7 | 4 |
4 | Palp on maxilliped longer than the outer plate | P. hirayamai Coleman & Lowry, 2012 |
– | Palp on maxilliped slightly shorter than the outer plate | 5 |
5 | Basis and merus of pereopod 5 expanded posterodistally | P. natalensis (K. H. Barnard, 1940) |
– | Basis and merus of pereopod 5 not expanded posterodistally | 6 |
6 | Coxae 1–4 with sparse setae on the distal margin | P. holmesi (Gurjanova, 1938) |
– | Coxae 1–4 with dense fringe of long slender setae on the distal margin | 7 |
7 | Antenna 1 peduncular article 1 slender | P. yongensis Coleman & Lowry, 2012 |
– | Antenna 1 peduncular article 1 robust | 8 |
8 | Antenna 1 peduncular article 2 as long as wide | P. japonicus (Tzvetkova, 1968) |
– | Antenna 1 peduncular article 2 longer than wide | 9 |
9 | Antenna 1 peduncular article 1 with produced terminal lateral lobe | P. testudo (Montagu, 1808) |
– | Antenna 1 peduncular article 1 with subterminal lateral lobe | 10 |
10 | Pereopods 6 and 7 with one or two short robust setae on the anterodistal corner of merus and carpus | P. dieteri Coleman & Lowry, 2012 |
– | Pereopods 6 and 7 lacking short robust setae on the anterodistal corner of merus and carpus | P. tinggiensis sp. nov. |
This work is part of the MSc thesis of the first author in the Post-Graduation Program in Marine Science of the Universiti Kebangsaan Malaysia. We are grateful to Dr Alan Myers, Dr Koraon Wongkamhaeng, and one anonymous reviewer for their critical comments on this manuscript. This study was financially supported by the Ministry of Education (Malaysia) under the Fundamental Research Grant Scheme (FRGS/1/2019/WAB13/UKM/02/3)