Quadrivisio bengalensis Stebbing, 1907

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, Zootaxa 5446 (3), pp. 383-404 : 398-402

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).

Figures

FIGURE 2. (a) Parhyale kalinga sp. nov., male paratype (LFSC.ZRC-200): 7 mm, Kalupada Ghat; (b) Chilikorchestia chiltoni gen. nov. sp. nov., male paratype (LFSC.ZRC-202): 11 mm, Honeymoon Island; (c) Grandidierella rabindranathi sp. nov., male paratype (LFSC.ZRC-204): 6 mm, Barkuda Island; (d) Quadrivisio bengalensis Stebbing, 1907, male (LFSC.ZRC-205): 9 mm, Kalupada Ghat, Chilika Lake, Odisha, India. Scale bars—1 mm.

FIGURE 12. Quadrivisio bengalensis Stebbing, 1907, male (LFSC.ZRC-205): 12 mm, Kalupada Ghat, Chilika Lake, (19°52'27"N 85°24'26"E), Odisha, India. Scale bars—0.3 mm.

FIGURE 13. Quadrivisio bengalensis Stebbing, 1907, male (LFSC.ZRC-205): 12 mm, Kalupada Ghat, Chilika Lake, (19°52'27"N 85°24'26"E), Odisha, India. Scale bars—1.0 mm.

FIGURE 14. Quadrivisio bengalensis Stebbing, 1907, male (LFSC.ZRC-205): 12 mm, Kalupada Ghat, Chilika Lake, (19°52'27"N 85°24'26"E), Odisha, India. Scale bars—0.3 mm.