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A New Species of the Freshwater Crab Genus Oziotelphusa Müller, 1887 from Tamil Nadu, India

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A New Species of the Freshwater Crab Genus Oziotelphusa Müller, 1887 from Tamil Nadu, India SPIXIANA 42 2 203-216 München, Dezember 2019 ISSN 0341-8391 A new species of the freshwater crab genus Oziotelphusa Müller, 1887 from Tamil Nadu, India (Crustacea, Decapoda, Brachyura, Gecarcinucidae) Sameer Kumar Pati & Francis Vargila Pati, S. K. & Vargila, F. 2019. A new species of the freshwater crab genus Oziotel- phusa Müller, 1887 from Tamil Nadu, India (Crustacea, Decapoda, Brachyura, Gecarcinucidae). Spixiana 42 (2): 203-216. A new species of gecarcinucid freshwater crab, Oziotelphusa naga sp. nov., is described herein from Nagercoil of Kanyakumari district in Tamil Nadu, India. The new species is distinct among the Indian congeners due to its stout and distinctly sinuous terminal segment of the male first gonopod. Among the Sri Lankan species of Oziotelphusa Müller, 1887, O. naga sp. nov. resembles O. minneriyaensis Bott, 1970, in the structure of the male gonopods but can easily be distinguished by the less convex dorsal surface of the carapace, the relatively more narrow frontal median triangle, and the relatively longer male second gonopod. Oziotelphusa is now rep- resented by 18 species: eight species from India and 10 from Sri Lanka. The distri- butional records of all the Indian species of Oziotelphusa are provided. Sameer Kumar Pati (corresponding author), Zoological Survey of India, Western Regional Centre, Akurdi, Pune-411 044, Maharashtra, India; e-mail: [email protected] Francis Vargila, Department of Zoology, Holy Cross College, Nagercoil-629 004, Tamil Nadu, India Introduction & Yeo, 2005, O. minneriyaensis Bott, 1970, O. populosa Bahir & Yeo, 2005, O. ritigala Bahir & Yeo, 2005, and The gecarcinucid genus Oziotelphusa Müller, 1887, is O. stricta Ng & Tay, 2001 (Ng & Tay 2001, Bahir & distributed in the lowlands of Sri Lanka and most Yeo 2005, Bahir et al. 2005). part of the Deccan Peninsula of India where rice is the The Indian species of Oziotelphusa are known major crop (Bahir & Yeo 2005, Pati & Sharma 2012a, only from certain districts of Indian states/union 2014, Pati et al. 2014, Raj et al. 2017). Oziotelphusa is territory: Anantapur district of Andhra Pradesh; one of the most species rich freshwater crab genera Bangalore Rural, Bangalore Urban, Chamarajanagar, in the Indian subcontinent and currently contains Chikballapura, Hassan, Kolar, Mysore, and Uttara 17 species: seven species from India: O. aurantia Kannada districts of Karnataka; Kozhikode, Malap- (Herbst, 1799), O. biloba Bahir & Yeo, 2005, O. bou- puram, Palakkad, Thrissur, Kottayam, and Kollam vieri (Rathbun, 1904), O. ganjamensis Pati & Sharma, districts of Kerala; Kolhapur, Nanded, Sangli, and 2012, O. kerala Bahir & Yeo, 2005, O. ravi Raj, Kumar Solapur districts of Maharashtra; Bhadrak, Ganjam, & Ng, 2017, and O. wagrakarowensis (Rathbun, 1904) and Puri districts of Odisha; Puducherry district of (Bahir & Yeo 2005, Pati & Sharma 2012a, Raj et al. Puducherry; Kancheepuram, Nagapattinam, Salem, 2017); and 10 species from Sri Lanka: O. ceylonensis Villupuram, and Kanyakumari districts of Tamil (Fernando, 1960), O. dakuna Bahir & Yeo, 2005, O. gal- Nadu (Table 1). There are probably more species licola Bahir & Yeo, 2005, O. hippocastanum (Müller, to be described from India as much of the Deccan 1887), O. intuta Bahir & Yeo, 2005, O. kodagoda Bahir peninsula is still largely unexplored, e. g. Odisha, 203 Fig. 1. Map showing distribution of Indian species of Oziotelphusa. Numbers correspond to the localities in Table 1. Telangana, Andhra Pradesh, part of Maharashtra Material and methods bordering with Karnataka, Belagavi and Kalaburagi divisions of Karnataka, south and central Tamil The collected crabs were preserved in 70 % ethyl alcohol Nadu, and lowlands of Kerala (Fig. 1). and deposited in the National Zoological Collection of Only three species of Oziotelphusa have so the Zoological Survey of India, Western Regional Cen- far been recorded from the state of Tamil Nadu: tre, Pune (ZSI-WRC). Specimens of O. ganjamensis were O. aurantia, O. bouvieri, and O. ravi (Latreille 1825, also examined from the collections ZSI-WRC and the Crustacean Section of the Zoological Survey of India, H. Milne Edwards 1837, A. Milne-Edwards 1869, Kolkata (ZSIK) in order to confirm its distributional Wood-Mason 1871, Henderson 1893, Ortmann 1893, range. 1897, De Man 1898, Rathbun 1904, Alcock 1910, The measurement method follows Ng (1988). The Fernando 1960, Bott 1970a,b, Bahir & Yeo 2005, Raj anatomical terminology is after Ng (1988), Ng & Tay et al. 2017) (Table 1, Fig. 1). The latter species was (2001), and Davie et al. (2015). The type specimens were only recently described by Raj et al. (2017) from photographed using Canon EOS 700D camera. The Keeriparai near Nagercoil of Kanyakumari district pencil drawings of the body parts were obtained in south Tamil Nadu. Recently, additional crab through a camera lucida and then digitally traced using specimens were collected from the rice fields near the GNU Image Manipulation Program (GIMP) soft- Nagercoil (Fig. 1). These crabs proved to be hitherto ware by following Montesanto (2015). Finally, the il- undescribed and are assigned to a new species of lustrations were processed using the Adobe Photoshop. The following abbreviations are used: cw, carapace Oziotelphusa, O. naga sp. nov. width; cl, carapace length; ch, carapace height; fw, frontal width; p2-p5, pereiopods 2-5; s1-s8, thoracic sternites 1-8; G1, male first gonopod; G2, male second gonopod. 204 Taxonomy of basal segment (Fig. 3I). Vulvae on thoracic sternite 6 oblong-ovate, large, occupying ca. 0.5 times length Family Gecarcinucidae Rathbun, 1904 of thoracic sternite 6, situated adjacent to margin with thoracic sternite 5 (Fig. 4C). Genus Oziotelphusa Müller, 1887 Description of male holotype Oziotelphusa naga sp. nov. Carapace transversely ovate, slightly broader than Figs 2-4 long (cw/cl = 1.3), moderately deep (ch/cl = 0.6); dorsal surface moderately convex, smooth except for Type material. Holotype: adult male (cw 37.79 mm, epigastric cristae, postorbital cristae, and posterolat- cl 28.33 mm, ch 17.35 mm, fw 11.50 mm), Edalakudy eral surfaces; anterolateral surface gently inflated in near Nagercoil, Kanyakumari district, Tamil Nadu, India frontal view; anterolateral margins short, strongly (8.169 °N, 77.452 °E), 9 m above sea level, 4 March 2018, convex, smooth, cristate; posterolateral margins long, collected by F. Vargila (ZSI-WRC C.1709). – Paratypes: gently concave, joins straight posterior carapace adult female (cw 38.39 mm, cl 28.85 mm, ch 19.00 mm, fw 11.68 mm), same data as holotype (ZSI-WRC C.1710); margin, with long, distinct, oblique striae; front not adult male (cw 34.86 mm, cl 26.74 mm, ch 15.98 mm, deflexed, trapezoidal, surface uneven; frontal margin fw 12.00 mm) and adult female (cw 36.33 mm, slightly broad (fw/cw = 0.3), slightly concave medi- cl 27.67 mm, ch 18.16 mm, fw 11.61 mm), same data as ally; epigastric cristae distinct, sharp, sloped laterally, holotype (ZSI-WRC C.1711); adult male (cw 33.77 mm, distinctly anterior to postorbital cristae, not confluent cl 25.64 mm, ch 15.19 mm, fw 11.14 mm) and adult with postorbital cristae; postorbital cristae distinct, female (cw 36.01 mm, cl 27.94 mm, ch 17.57 mm, sharp, almost straight, not sloping, entire; external fw 11.73 mm), same data as holotype (ZSI-WRC C.1712); orbital tooth prominent, triangular, tip slightly below adult male (cw 32.30 mm, cl 24.81 mm, ch 14.43 mm, line with frontal margin, clearly demarcated from fw 10.67 mm) and adult female (cw 35.44 mm, epibranchial tooth by V-shaped notch, outer margin cl 27.06 mm, ch 17.06 mm, fw 11.40 mm), same data as almost straight, ca. 3 times length of inner margin, holotype (ZSI-WRC C.1713). inner margin gently curved, joining supraorbital Diagnosis. Carapace dorsal surface moderately margin; epibranchial tooth moderate, sharp, very convex; frontal margin slightly concave medially; slightly elevated from postorbital cristae, distinctly postorbital cristae sharp, almost straight, not slop- away from level of supraorbital margin; postorbital ing, entire; epibranchial tooth moderate, sharp, very region strongly concave; branchial regions inflated; slightly elevated from postorbital cristae; branchial cervical grooves deep, broad, short, discontinuous, regions gently inflated; frontal median triangle not not reaching postorbital cristae; mesogastric groove as broad as frontal margin, dorsal margin completely shallow, narrow, very short, bifurcated posteriorly; fused with lateral margins; epistomal median lobe H-shaped groove visible; subhepatic region rugose; with distinct tooth (Figs 2A,B, 3A,B, 4A). Suture suborbital region rugose, glabrous; suborbital mar- between male thoracic sternites s2/s3 distinct, gin concave, entire, lined with very low, rounded deep, not reaching lateral margins; suture between granules; pterygostomial region smooth, glabrous; male thoracic sternites s3/s4 distinct as broad, deep frontal median triangle complete, not as broad as groove or visible as 2 moderately deep submedian frontal margin, dorsal margin completely fused with depressions, not reaching lateral margins (Figs 2C, lateral margins; epistomal median lobe with distinct 3D). Male pleon relatively T-shaped, lateral margins tooth (Figs 2A,B, 3A,B). strongly concave; pleonal somite 6 trapezoidal, Eyes filling up most of orbital space; eye stalk broader than long, as long as telson, with gently to moderately long, stout; cornea moderately large, distinctly concave lateral margins; telson relatively pigmented (Fig. 2B). Antennae long,
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