Typhlocarcinops serenei Turkay 1986
Creators: name: Ng, Peter K. L.
name: Rahayu, Dwi Listyo
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Pilumnidae
Typhlocarcinops
Typhlocarcinops serenei

description: Typhlocarcinops serenei Türkay, 1986   
(Fig. 61)  
 Typhlocarcinops serenei Türkay, 1986: 162, text-figs. 51–55, figs. 11, 12; Ng 1987: 78; Ng et al. 2008: 144.   
 Material examined. Paratype: 1 male (4.2 × 3.4 mm) (SMF 13559), station S0-02/20-G, Ras Abu Shagara (Sudan), 20º57.1’N 36º26.9’E, 601 m, Red Sea, coll. FS Sonne, 13 October 1977.   
 Diagnosis. Carapace broad (Fig. 61A) about 1.4−2.0 times broader than long, surface smooth anteriorly, with granules posteriorly, regions indistinct, H-shaped gastro-cardiac grooves slightly indicated; anterolateral margin arcuate, lined with tiny granules and sparse setae, separated by 3 shallow depression, forming 4 low, broad lobes; posterolateral surface and margin with scarce, scattered tubercles. Front (Fig. 61A, B) bilobed, with shallow median cleft, margin of each lobe slightly convex. Orbit (Fig. 61B) short, bulbous ocular peduncles filling orbit, immovable, cornea small, well pigmented. Epistome (Fig. 61B) relatively broad, triangular median lobe with median suture. Third maxilliped (Fig. 61C) with merus broad, squarish, anteroexternal angle rounded, outer and inner margins straight, ischium and merus subequal, inner margin slightly shorter than outer margin, lower margin slightly oblique; exopod relatively slender, tip reaching to just before distal edge of merus, inner margin with distinct tooth. Chelipeds in male unequal, outer surface of fingers of chela (Fig. 61E) smooth, with longitudinal ridge and scattered tubercles proximally on dactylus and fixed finger; surface of palm of major chela smooth; cutting edges of fingers with broad teeth; inner angle of carpus without protuberance, with short, broad tooth (Fig. 61D). P2−P5 (Fig. 61F) proportionally long, fringe by sparse long setae on dorsal and ventral margins, merus of P5 not reaching front when folded. Fused thoracic sternites 1, 2 broadly triangular (Fig. 61C), proportionally narrow; thoracic sternites 3, 4 partially fused, with only lateral suture discernible. Male pleon (Fig. 61C, G) relatively broad, telson long, 1.7 times as long as somite 6, subtriangular with rounded distal margin. G1 (Fig. 61 H–L) slender, upper half distinctly longer than lower half, slightly sinuous, distal part directed upwards with pointed tip. Female not known.   
 Remarks. While the morphology of T. serenei resembles T. marginatus and T. transversus in the rectangular carapace shape and presence of low lobes on the anterolateral margin, it differs markedly in the shape of the G1, with the lower part strongly sinuous and the upper half relatively straighter and the tip not curved laterally (Fig. 61 H–L). The G1s of T. marginatus and T. transversus do not have the lower half as strongly sinuous (Figs. 56B, C, 60 C–G) and in T. transversus, the tip is slightly bent. The third maxilliped of T. serenei resembles that of T. transversus in that the anteroexternal angle of the merus is rounded and not auriculiform (Figs. 60A, 61B, C) but in T. marginatus, this structure is distinctly auriculiform (Fig. 56A)   
 The structure of the G1, notably strongly sinuous lower part, also allies T. serenei with T. tonsuratus, T. ocularius and T. atimovatae n. sp., although these species have distinctly more quadrate carapaces which are also relatively high (Fig. 61A versus Figs. 34A, 45A, 47A). In addition, the anterolateral margins of T. ocularius and T. atimovatae n. sp. are entire or only with very low lobes (Figs. 45B, 47B) while that of T. serenei has distinct low teeth (Fig. 61A). The G1s of T. ocularius and T. atimovatae n. sp., are, however, more slender and proportionately longer (Figs. 46, 49 C–F). The G1 of T. serenei most closely resembles that of T. tonsuratus but in this species, the tip is more elongate and gently upcurved (Fig. 34 E–G).   
 Type locality. Ras Abu Shagara, Sudan, Red Sea.   
 Distribution. Red Sea, from depths of 363– 601 m.
description: Published as part of Ng, Peter K. L. & Rahayu, Dwi Listyo, 2020, A synopsis of Typhlocarcinops Rathbun, 1909 (Crustacea: Decapoda: Brachyura: Pilumnidae), with descriptions of nine new species from the Indo-West Pacific, pp. 1-100 in Zootaxa 4788 (1) on pages 73-75, DOI: 10.11646/zootaxa.4788.1.1, http://zenodo.org/record/3878222