Quadrivisio bengalensis Stebbing 1907
Creators: name: Thacker, Dimple
name: Myers, Alan A.
name: Trivedi, Jigneshkumar N.
name: Mitra, Santanu
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Maeridae
Quadrivisio
Quadrivisio bengalensis

description: Quadrivisio bengalensis Stebbing, 1907
(Figs. 2d, 12–14)
Material examined. 4 males (9–12 mm), LFSC.ZRC–205, Kalupada Ghat, Chilika Lake, (19°52'27"N 85°24'26"E), Odisha, India, 1 September 2018, coll. D. Thacker.
Description. Based on male (12 mm).
Head. Eyes ommatidia divided into two clusters on each side. Antenna 1 shorter than antenna 2; peduncular article 1 and 2 subequal; article 3 one fifth of the size of article 2; accessory flagellum 9 articulated (Fig. 12: A1). Antenna 2 peduncular article 4 0.77 x of article 5 (Fig. 12: A2). Mandible accessory setal row with 8 setae; molar well developed (Fig. 12: Md). Maxilla 1 inner plate inner margin with simple setae; outer plate with 6 dentate setae apically; palp article 2 with 7 small apical robust setae and 1 simple setae (Fig. 12: Mx1). Maxilla 2 inner plate with simple setae on inner margin and apically; outer plate with simple apical setae (Fig. 12: Mx2). Maxilliped inner plate setose marginally with simple setae and apically with 3 small robust setae; outer plate with 11 robust marginal setae; palp 4 articulated (Fig. 12: Mxp).
Pereon. Gnathopod 1 coxa longer than broad, subrectangular; basis distally expanding with 2 tufts of long setae on posterior margin and few small setae on anterior margin; merus with posterodistal spine; propodus palm straight; dactylus curved, smaller than palm (Fig. 13: G1). Gnathopod 2 coxa longer than broad; basis with few long setae on posterior margin; propodus posterior margin straight, palm transverse with one distal protuberance with 5 small spine, dactylus subequal to palm (Fig. 13: G2).
Pleon. Eprimera 1–3 with a posteroventral corner acutely produced (Figs. 14: Ep1–Ep3). Uropod 1 peduncle subequal to rami (Fig. 14: U1). Uropod 2 peduncle subequal rami (Fig. 14: U2). Uropod 3 peduncle half of the size of subequal leaf like rami (Fig. 14: U3). Telson deeply cleft with 6 apical setae and 8 setae on inner margin on each lobe (Fig. 14: T).
Remarks.
Hitherto two species of genus Quadrivisio Stebbing, 1907 have been reported from India including Q. bengalensis. The specimen described here matches with the description and figures of Q. bengalensis given by Stebbing (1907).
Distribution. India (Stebbing 1907; Annandale 1908; Chilton 1921; Barnard 1935; Nayar 1959; Rabindranath 1972; Lyla et al. 1998; Lyla et al. 2004; Nair et al. 1983; Dev Roy et al. 2009; Venkataraman 2007; Mondal et al. 2010; Thilagavathi et al. 2013; Khan et al. 2017; Mandal & Nandi 1989; Danda et al. 2017), Kenya (Chevreux 1913), Thailand (Chilton 1925; Hughes & Kaji 2016), Fiji (Schellenberg 1938), South China Sea (Ren 2012).
description: Published as part of Thacker, Dimple, Myers, Alan A., Trivedi, Jigneshkumar N. & Mitra, Santanu, 2024, On a small collection of amphipods (Crustacea, Amphipoda) from Chilika Lake with the description of three new species and a new genus, pp. 383-404 in Zootaxa 5446 (3) on pages 398-402, DOI: 10.11646/zootaxa.5446.3.4, http://zenodo.org/record/11101909