Habrobathynella vaitarini Reddy & Totakura, 2010, n. sp.
Creators: name: Reddy, Yenumula Ranga
name: Totakura, Venkateswara Rao
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Bathynellacea
Parabathynellidae
Habrobathynella
Habrobathynella vaitarini

description: Habrobathynella vaitarini n. sp.
(Figs 9–14)
Type material. Holotype 3 (dissected on 3 slides) (C5836/2, C5840/2, C5841/2), allotype Ƥ (dissected on 3 slides) [MNHN-Sy26(1–3)] and 7 paratypes: 2 Ƥ (dissected on 3 slides each) [MNHN-Sy27(1–3), MNHN- Sy28(1–3)]; 2 Ƥ (in alcohol in 1 vial) (MNHN-Sy44); 2 33 (dissected on 3 slides each) [(MNHN-Sy30(1– 3), MNHN-Sy31(1-3)] and 1 3 (whole-mounted) (MNHN-Sy32), River Krishna at Madipadu village (16°48ʹ50ʹ N 80°04ʹ22ʹ E; elevation 40 m; water temperature 32°C; pH 7.5), in Guntur District, Andhra Pradesh, India, leg. V.R. Totakura, 27 July 2008.
Other material examined. 1 3, 2 Ƥ in alcohol in 1 vial (MNHN-Sy45), River Krishna at Pulichintala village (16°49ʹ22ʹ N 80°04ʹ0 3ʹ E; elevation 44 m; water temperature 32°C; pH 7.5), in Guntur District, Andhra Pradesh, India, leg. V.R. Totakura, 27 July 2008; 1 Ƥ (in ethanol in junior author’s collection), leg. V.R. Totakura, 12 October 2008; 1 Ƥ (dissected on 3 slides) [(MNHN-Sy29(1-3)], 3 Ƥ (in alcohol in 1 vial) (MNHN-Sy44), River Krishna at Challagariga village (16°45ʹ32ʹ N 80°07΄35΄ E; elevation 39 m) in Guntur District, Andhra Pradesh, India, leg. V.R. Totakura, 27 July 2008.
Diagnosis: Male thoracopod VIII subglobular, with dentate and inner lobes only moderately produced; outer lobe smooth, narrow and shorter than basipod; exopod small, appearing as incurved claw laterally. Basipod unornamented, basipodal seta lying apart from endopodal seta. Uropodal sympod with inhomonomous row of 7 spines, ultimate spine being longer and thicker than proximal ones. Setae on uropodal endopod short. Maxilla with 3 unequal setae on segment 1 and fairly long claw-like seta on segment 2. Pleotelson slightly produced postero-laterally; setae shorter than furca. Caudal furca longer than wide
Description of adult male. Total body length of holotype 1.25 mm, of paratypes 1.06–1.3 mm, mean 1.2 mm (n = 4). Body (Fig. 9)) elongate, heavily chitinised and perforated, 9.1 times as long as wide. Head 1.2 times as long as wide, 14.2% longer than first three thoracic segments combined.
Antennule (Figs 10 a, 11a): 6-segmented; 25.2% longer than head. First segment with 2 dorsal plumose and 1 ventral setae at subdistal outer margin, 1 plumose seta at outer distal corner, 1 long simple seta on dorsal surface. Second segment with 1 plumose seta on papillate projection on ventral surface, 2 dorsal plumose setae at subdistal outer margin, 1 simple seta at inner distal corner. Third segment with 1 small dorsal seta at inner distal corner, 1 small plumose seta and 1 long simple seta at about outer distal corner. Inner flagellum longer than wide, with 2 unequal setae on apical margin and 1 long subapical seta. Fourth segment with 2 unequal plumose setae on apophysis and 1 plumose seta near inner distal corner and 1 stub seta. Fifth segment with 3 unequal ventral aesthetascs overreaching ultimate segment and 2 setae on distal dorsal surface and 2 setae at inner distal corner. Sixth segment with 3 aesthetascs and 4 unequal setae.
Antenna (Fig. 10 b): 2-segmented, proximal segment bare, 0.4 times as long as distal segment; second segment 1.8 times as long as wide, with 1 tiny proximal seta, 2 unequal terminal setae, of which inner one plumose and 2.5 times as long as segment, and 1 subterminal dorsal seta.
Labrum (Figs 10 c, 11b): dentate margin vaguely vaulted on either side, bearing 10 main nearly uniform, pointed, curved teeth, and 1 small tooth on either side. Also, 4 rows of fine spinules (ctenidia) and 3 teats on ventral surface, as illustrated.
Mandible (Figs 10 d–f, 11c): distal part of pars incisiva with 4 unequal teeth. Tooth of ventral edge large, lateral margin finely denticulate. Pars molaris developed into pyriform outgrowth, 1.4 times as long as wide, carrying 2 finely denticulate, curved unequal teeth and some setules on inner margin, proximal tooth larger, and 3 somewhat strong, unequal, finely denticulate teeth in a group at distal end, all teeth articulate, distal outer margin of pars molaris with very tiny denticles. Palp completely absent.
Paragnath (Fig. 10 g) as in H. krishna.
Maxillule (Fig. 10 h–i): with 2 endites; proximal endite oval, carrying 3 nearly equal claw-like pinnate spines on inner distal margin and 1 short smooth subdistal spine. Distal endite strong, 2.2 times as long as maximum width and armed with 4 terminal claws, distalmost one large, bent inwards, 2 unequal claws (1 long, 1 reduced) on inner margin and 3 subterminal setae on outer distal margin.
Maxilla (Figs 10 j–k, 11d): 3-segmented, somewhat bent inwards; basal segment 1.6 times as long as wide, with 3 unequal slender setae on small protuberance at inner distal corner. Second segment 1.2 times as long as basal segment and armed with 13 simple setae including 2 setae at mid-inner margin and 1 long prehensile claw-like seta at inner distal corner. Third segment almost completely fused with terminal claw, which has finely serrulate inner margin.
Thoracopods I–VII (Figs 12 a–e, 13a–b): as in H. krishna. except for proportions of exo- and endopodal segments.
Thoracopod VIII (Fig.14 a–b): subglobular, 1.3 times as long as wide; in lateral view, protopod large; outer lobe conical, fused with protopod and extending beyond midlength of basipod. Penile region at the same level as exopod. Dentate lobe slightly longer than inner lobe and with about 6 denticles. Inner lobe ovate in outline. Basipod well defined at base, with 1 seta at outer distal angle and without ornamentation on inner distal region. Exopod small, incurved claw, heavily chitinised, distinct from basipod, closely pressed against dentate lobe and carrying 2 large denticles. Endopod represented by a small seta lying close to exopod.
cate, 56% of sympod length, disto-lateral margins ornamented with spinules and with 2 unequal, short barbed setae at proximal quarter of outer margin, longer seta 0.3 times as long as endopod.
Pleotelson (Fig. 13 c–e): with 1 seta on either side at base of caudal furca; seta 0.6 times as long as caudal furca, in lateral view.
Anal operculum: somewhat protruded in lateral view (Fig. 13 d), medially concave in ventral view (Fig. 13 e).
Caudal furca (Fig. 13 c–e): longer than maximum width, with 1 terminal and 3 inner serrulate spines and 2 unequal dorsal plumose setae; each spine with transverse row of very tiny spinules at base; furcal organ small, ventral.
Description of adult female. Total body length of allotype 1.29 mm, of paratypes 0.9–1.4 mm, mean 1.3 mm (n = 4). Body and all appendages except Th. VIII as in male.
Thoracopod VIII (Fig. 14 c): small, somewhat triangular lobe.
Variation. Shape of the female thoracopod VIII varies slightly (Fig. 14 c–d). No variation in the number of spines on uropodal sympod (Fig. 13 c, e).
Etymology. The specific epithet is derived from the Vedic term Vaitarini, which is equivalent to the Greek Styx, meaning a river in the underground; proposed here as a noun in apposition to the generic name.
description: Published as part of Reddy, Yenumula Ranga & Totakura, Venkateswara Rao, 2010, A taxonomic revision of the genus Habrobathynella Schminke, 1973, with the description of four new species from southeastern India (Crustacea, Malacostraca, Bathynellacea), pp. 1-54 in Zootaxa 2532 on pages 13-20, DOI: 10.5281/zenodo.196550