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Branchiopoda: Spinicaudata: Limnadiidae) of Tropical Asia, with the Description of a New Species

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Branchiopoda: Spinicaudata: Limnadiidae) of Tropical Asia, with the Description of a New Species Zoological Studies 59:41 (2020) doi:10.6620/ZS.2020.59-41 Special Issue: Fossil and Modern Clam Shrimp (Branchiopoda: Spinicaudata, Laevicaudata) Open Access Review of the Eulimnadia (Branchiopoda: Spinicaudata: Limnadiidae) of Tropical Asia, with the Description of a New Species La-orsri Sanoamuang1,2,*, Sameer M. Padhye3,4, and D. Christopher Rogers5 1Applied Taxonomic Research Center, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. *Correspondence: E-mail: [email protected] (Sanoamuang) 2International College, Khon Kaen University, Khon Kaen 40002, Thailand 3Systematics, Ecology & Conservation Lab, Zoo Outreach Organization, Coimbatore, India. E-mail: [email protected] (Padhye) 4Present address: Biologia Life Science LLP, Ahmednagar, India 5Kansas Biological Survey, and The Biodiversity Institute, The University of Kansas, Higuchi Hall, 2101 Constant Avenue, Lawrence, KS 66047-3759, USA. E-mail: [email protected] (Rogers) Received 18 November 2019 / Accepted 19 December 2019 / Published 5 August 2020 Special issue (articles 32-46) communicated by Thomas A. Hegna and D. Christopher Rogers We describe a new species of Eulimnadia from the Oriental region using museum specimens collected from India and fresh material from Thailand. This species has egg morphology resembling E. magdalensis s. lat. and E. chaperi, but distinctly differs from them by presence of a narrow depression at the polygon floor. We also comment on the species status of E. khoratensis from Thailand based on egg morphology, and present a taxonomic key for identification of tropical Asian species of Eulimnadia. Key words: Eulimnadia cryptus sp. nov., Eulimnadia michaeli, Spiny clam shrimp, Diplostraca, Systematics, Synonymy. BACKGROUND sp. from Northeast Thailand (Martin et al. 2003), Cyclestheria hislopi (Baird, 1859) from Cambodia, The large branchiopods are a relatively small group Malaysia, Singapore, Indonesia and Thailand (Martin of primitive crustaceans comprising the fairy shrimps et al. 2003), and Eulimnadia “magdalensis” Roessler, (Anostraca), tadpole shrimps (Notostraca), and clam 1990 from Cambodia (Rabet 2010; Padhye and Rabet shrimps (Laevicaudata, Spinicaudata, Cyclestherida) 2017). Following intensive collections of clam shrimp (Brendonck et al. 2008). In Southeast Asia (SE Asia), across Thailand since 2012, a total of eight species of clam shrimp and fairy shrimp occur mostly in seasonal, clam shrimps (one species of Cyclestheria, two species lentic, freshwater habitats (Rogers et al. 2013). Although of smooth clam shrimps, and five species of spiny clam tadpole shrimp have been found in India, China, and shrimps) have so far been recorded in this country Japan, there are no records of this group in SE Asia (Rogers et al. 2013 2016a b). Two species of smooth (Rogers et al. 2013). The clam shrimps of SE Asia have or laevicaudatan clam shrimps include the recently only recently been examined (Rogers et al. 2016a b), described; Lynceus spinimanus Rogers, Saengphan, most records (25 species) have been documented from Thaimuangphol and Sanoamuang, 2016, and Lynceus the Indian subcontinent (Rogers and Padhye 2015; planifascius Rogers, Saengphan, Thaimuangphol and Padhye and Rabet 2017; Padhye and Kulkarni 2017; Sanoamuang, 2016 (Rogers et al. 2016a). In addition, Padhye et al. 2018; Padhye and Lazo-Wasem 2018). five species of spiny or Spinicaudatan clam shrimps During 2003–2010, there were only three records of consist of (1) Cyzicus pilosus Rogers, Thaimuangphol, clam shrimps from SE Asia; including Eulimnadia Saengphan and Sanoamuang, 2013; (2) Leptestheria Citation: Sanoamuang L, Padhye SM, Rogers DC. 2020. Review of the Eulimnadia (Branchiopoda: Spinicaudata: Limnadiidae) of tropical Asia, with the description of a new species. Zool Stud 59:41. doi:10.6620/ZS.2020.59-41. © 2020 Academia Sinica, Taiwan 1 Zoological Studies 59:41 (2020) page 2 of 7 serracauda Rogers, Dadseepai and Sanoamuang, 2016; Chon Buri Province: Highway 3 (Sukhumvit Road), (3) Eulimnadia khoratensis Rogers, Dadseepai and between Sattahip and Nang Sar-re, pool formed in Sanoamuang, 2016; (4) Eulimnadia indocylindrova road ruts on east side, 12°43'24.75"N, 100°53'17.52"E, Durga Prasad and Simhachalam, 2004; and (5) 12 June 2015, D.C. Rogers, L. Sanoamuang, N. Eulimnadia compressa (Baird, 1860) (Rogers et al. 2013 Sanoamuang coll, 23 hermaphrodites. Khon Kaen 2016b). However, our re-examination of specimens Province, Nai Muang District, table drain on Jenjobtid of the species previously identified as E. compressa Road, 16°05'42.57"N, 102°44'37.73"E, 9 May 2015, demonstrates it to be a new species. Thus, we describe P. Dadseepai coll, 46 hermaphrodites. Rice paddies Eulimnadia cryptus sp. nov., correct a taxonomic error, on south side of Highway 208, 16°19'18.09"N, and present keys to the Asian Eulimnadia species (note 102°51'35.63"E, 19 June 2015; D.C. Rogers, and P. Timms and Rogers (2020) provide diagnostic features Dadseepai coll., 64 hermaphrodites. Muang District, of Eulimnmadia and Paralimnadia) based on egg Ban Pet, Bypass Road, 16°25'50.71"N, 102°46'00.23"E, morphology. 12 June 2015, D.C. Rogers, and P. Dadseepai coll., 136 hermaphrodites. Muang District, Ban Pet, Bypass Road, 16°25'59.61"N, 102°45’55.98"E, 12 June 2015, MATERIALS AND METHODS D.C. Rogers and P. Dadseepai coll., 71 hermaphrodites. Muang District, Ban Pet, Bypass Road, 16°26'50.86"N, Specimens were examined using a Wild M8 and 102°46'08.23"E, 12 June 2015, D.C. Rogers and P. a Zeiss Stemi 2000 stereomicroscope outfitted with Dadseepai coll., 13 hermaphrodites. Ban Phai District, a Q-Imaging Micropublisher 5.0 RTV digital camera Ban Nong Wang Rai, 16°05'42.57"N, 102°44'37.73"E, utilizing Q-Capture 7.0 acquisition software. Scanning 9 June 2015, P. Dadseepai coll., 44 hermaphrodites. Electron Microscopy (SEM) images of the eggs were Maha Sarakham Province: Agricultural drain on west taken with a Philips XL-30 Environmental Scanning side of 2300 Road, 16°14'14.51"N, 102°54'52.19"E, Electron Microscope at an accelerating voltage of 10 19 June 2015, D.C. Rogers and P. Dadseepai coll., 8 kV using the chemical drying protocol given by Nation hermaphrodites. Roi Et Province: Roadside rice paddy, (1983). across road from Lao Luang Sub District Administration Organisation Public Park on west side of Highway 214, between Kaset Wisai and Si Khot, just east of Lao RESULTS Luang, 15°43'33.51"N, 103°34'45.34"E, 23 May 2015, P. Dadseepai coll., 62 hermaphrodites. Udon Thani SYSTEMATICS Province: Rice paddy on north side of Highway 2023 Limnadiidae Baird, 1849 east of Phan Don, 17°07'27.48"N, 102°58'25.22"E, 20 June 2015, D.C. Rogers, S. Tiang-nga, and S. Mali- Eulimnadia cryptus sp. nov. ong coll., 58 hermaphrodites. Rice paddy on north side (Figs. 1, 2) of Highway 2023, between Kumphawapi and Wiang urn:lsid:zoobank.org:act:86CA69FE-1ED3-404B-8B88- Kham, 17°06'39.31"N, 103°02'18.81"E, 20 June 2015, CA2DBE05E5F3 D.C. Rogers, S. Tiang-nga, and S. Mali-ong coll., 107 hermaphrodites. Rice paddy 1.7 km east of Highway = Eulimnadia sp. Rogers et al. 2013a: 76, Fig. 1D 2023, between Tat Thong and Champi, 17°01'22.90"N, = Eulimnadia compressa (Baird, 1860) in Rogers and 103°08'32.22"E, 20 June 2015, D.C. Rogers, S. Tiang- Padhye 2015: 401; Rogers et al. 2016b: 567, Fig. nga, and S. Mali-ong coll., 4 hermaphrodites. Rice 1A–C paddy on west side of Highway 2 n 023, just north of Champi, 16°59'25.35"N, 103°09'08.90"E, 20 June 2015, Distribution: India, Thailand, and Cambodia D.C. Rogers, S. Tiang-nga, and S. Mali-ong coll., 107 (Rabet 2010; Rogers et al. 2013a; Rogers and Padhye hermaphrodites. 2015; Padhye and Rabet 2017; this study). Types: We designate material from USNM Habitat: All our collections were from 1143259 as the types. The holotype is deposited at the anthropogenic rainwater puddles, table drains, rice United States Natural History Museum (Smithsonian), paddies, and storm water retention basins. under collection number USNM 1604207. The Material examined: India, Tamil Nadu: remaining E. cryptus sp. nov. are designated as Chingleput, unused rice patty six kilometres north paratypes and are retained as USNM 1143259. of Mahabalipuram, 12.67°N, 80.17°E, 24 October The original lot also contained nine specimens 1980, D. Belk, USNM 1143259, 43 hermaphrodites of Eulimnadia indocylindrova Durga Prasad and (see comments below under “Types”). Thailand, Simhachalam, 2004 (fide Padhye et al. 2015). The © 2020 Academia Sinica, Taiwan Zoological Studies 59:41 (2020) page 3 of 7 material of E. indocylindrova is now USNM 1604210. acute, slightly upturned apically, 0.7x ocular tubercle Diagnosis: (Modified from Rogers et al. 2016b). width. Angle between rostrum and frons 100° to 90°. Defining characters only visible with scanning electron Rostrum even with head ventral surface. Pedunculate microscopy. Mature egg (Fig. 1A–C) with 14–18 frontal organ length approximately 0.60x to 1.2x polygons, each with deep, sloping sides, towards a distance of organ from ocular tubercle. Frontal organ shallowly furrowed base, often with several small pits prominent, pedunculate, directed anteriorly, and elongate (Fig. 1D). Polygons margined with narrow ridges, ovate to subtriangular. First antennae well below and bearing uneven edges, which can project as flat, posterior to rostrum, pedunculate, and 0.5x as long as narrow lobes especially at ridgeline intersections. second antennal peduncle. Second antennae 2 to 2.5x Each depression with a central, transverse wrinkled head length. Second antennal peduncle subcylindrical, groove, lacking subtending pores. Eggs 120–130 μm in subequal in length to head, slightly geniculate, and diameter. bearing dorsal transverse rows of spiniform setae. Description: Egg as for diagnosis above. Second antennal anterior flagellum (exopod) with six or Description based on putative hermaphrodite.
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