Nanosesarma jousseaumei ( Nobili, 1906 )

Nanosesarma jousseaumei ( Nobili, 1906) View in CoL

( Figs. 1E View Figure 1 , 6 View Figure 6 , 7I, J View Figure 7 )

Sesarma (Sesarma) jousseaumei Nobili, 1906: 411 View in CoL . — Nobili, 1906: 323, pl. 8, fig. 9.

Sesarma (Sesarma) jousseaumei View in CoL — Laurie, 1915: 416. — Guinot, 1976: 283.

Nanosesarma jousseaumei View in CoL — Holthuis, 1977:172–174. — Ng et al., 2008: 221. — Poupin et al., 2018: 71, fig. 19G.

Material examined. 5 males (CL: 2.71–4.82 mm, CW: 3.12–5.55 mm), 12 females (CL: 5.43– 5.41 mm, CW: 4.08–6.24 mm), LFSC.ZRC-187, India, Gujarat, Shivrajpur (21°19’55”N 68°57’02”E), coll. Jigneshkumar Trivedi, 3 February, 2016 GoogleMaps .

Diagnosis. Carapace quadrangular, 1.1–1.15 times wider than long, lateral margins almost straight, converging posteriorly; dorsal surface smooth, covered with setal tufts and long setae sparsely set among shorter plumose setae, regions well defined, front slightly protruded, bilobed with a shallow depression, extending to gastric region, straight depression separating gastric and cardiac regions, cardiac region with 2 small elevations, separated from intestinal region by a shallow depression, weakly granulated oblique ridge on posterior surface of carapace, extending from lateral margin to posterior edge. External orbital tooth triangular, followed by small, blunt epibranchial tooth( Figs.1E View Figure 1 , 6A View Figure 6 ). Basal antennal article ( Fig. 6B View Figure 6 ) long, reaching to base of flagellum.

Third maxilliped morphology identical to that of N. sarii ; ischium 1.33 times longer than merus, internal margin crenulated, possess long setae, merus 1.26 times longer than wide, with crenulated longitudinal margins, internal margin with long setae. exopod slender, with long flagellum ( Fig. 6C View Figure 6 ).

Chelipeds distinctly unequal, palm relatively large, dorsal surface without oblique pectinate crest or granulated ridges, outer surface bearing 3 rows of tubercles fully covered with dense setae extending anteriorly to proximal portion of fingers ( Fig. 6D View Figure 6 ), lower one with small tubercles, extending to basal third length of pollex, middle one shortest, oblique, with relatively large tubercles, upper row of granules short, nearly parallel to median one. Upper margin with sparse tubercles, some tubercles present on upper part. Fingers shorter than palm, with a large gap in proximal half, dactylus straight, dorsal surface completely smooth, small proximal granules with a large distinct tubercle on outer surface, distal half of cutting edge with 6 or 7 low tubercles, distalmost larger, pollex cutting edge with large prominent tubercle in middle part, tips of fingers spatulated ( Fig. 6E View Figure 6 ).

Pereopods medium-sized, all articles except dactylus, densely covered with short plumose setae, long bristles between them. Meral posterior margins with distinct tooth-shaped granules, posterodistal margin with spiniform teeth, proximal one largest. Carpal anterior and posterior margins with longitudinal line of small tubercles, P5 without such line on posterior surface of carpus. Propodi smooth, 1.5 times as long as wide, posterodistal end with 2 groups of 3 small spines. Dactylus ending in large spine; 6 spines in 2 rows along posterior margin ( Fig. 6F View Figure 6 ).

Male pleon bluntly triangular, pleomere 6 about 3.5 times as broad as long, lateral margins gently converging distally, telson 0.97 times as long as wide, rounded distally ( Fig.6G View Figure 6 ). Female pleon large, round, pleomere 6 longer than others, telson small, inserted into pleomere 6 ( Fig. 6H View Figure 6 ).

G1 long, straight, distal part long, gently bending outwards, covered with long setae, posterior surface concave, groove nearly straight, terminal opening in posterior apical part. Some plumose setae along lateral margin ( Fig. 7I–J View Figure 7 ).

Remarks. The specimens examined in the present study agree with the descriptions and illustrations of N. jousseaumei and N. sarii as discussed in Naderloo and Türkay (2009). The morphological comparison of N. jousseaumei with other species of Nanosesarma reported from India is provided in Tab. 1.

Distribution. Nanosesarma jousseaumei was originally described from Gulf of Aden ( Nobili, 1906), and later reported from Madagascar, Dar es Salaam, Persian Gulf ( Naderloo and Türkay, 2009), Mayotte ( Poupin et al., 2018), and India ( Trivedi et al., 2018). In India,it is known only from Gujarat ( Ghosh, 2004; Dev Roy, 2013; present study).