Typhlocarcinops serenei Türkay, 1986

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, Zootaxa 4788 (1), pp. 1-100 : 73-75

publication ID	https://doi.org/ 10.11646/zootaxa.4788.1.1
publication LSID	lsid:zoobank.org:pub:7A461DBA-00B7-48DB-9320-4775DA8F21B2
DOI	https://doi.org/10.5281/zenodo.10564047
persistent identifier	https://treatment.plazi.org/id/03C05222-FFEA-FC46-FF35-D2C9FC84FD05
treatment provided by	Plazi
scientific name	Typhlocarcinops serenei Türkay, 1986
status

Treatment

Typhlocarcinops serenei Türkay, 1986 View in CoL

( Fig. 61 View FIGURE 61 )

Typhlocarcinops serenei Türkay, 1986: 162 View in CoL , 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 GoogleMaps .

Diagnosis. Carapace broad ( Fig. 61A View FIGURE 61 ) 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 View FIGURE 61 ) bilobed, with shallow median cleft, margin of each lobe slightly convex. Orbit ( Fig. 61B View FIGURE 61 ) short, bulbous ocular peduncles filling orbit, immovable, cornea small, well pigmented. Epistome ( Fig. 61B View FIGURE 61 ) relatively broad, triangular median lobe with median suture. Third maxilliped ( Fig. 61C View FIGURE 61 ) 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 View FIGURE 61 ) 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 View FIGURE 61 ). P2−P5 ( Fig. 61F View FIGURE 61 ) 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 View FIGURE 61 ), proportionally narrow; thoracic sternites 3, 4 partially fused, with only lateral suture discernible. Male pleon ( Fig. 61C, G View FIGURE 61 ) relatively broad, telson long, 1.7 times as long as somite 6, subtriangular with rounded distal margin. G1 ( Fig. 61 View FIGURE 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 View FIGURE 61 H–L). The G1s of T. marginatus and T. transversus do not have the lower half as strongly sinuous ( Figs. 56B, C View FIGURE 56 , 60 View FIGURE 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 View FIGURE 60 , 61B, C View FIGURE 61 ) but in T. marginatus , this structure is distinctly auriculiform ( Fig. 56A View FIGURE 56 )

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 View FIGURE 61 versus Figs. 34A View FIGURE 34 , 45A View FIGURE 45 , 47A View FIGURE 47 ). In addition, the anterolateral margins of T. ocularius and T. atimovatae n. sp. are entire or only with very low lobes ( Figs. 45B View FIGURE 45 , 47B View FIGURE 47 ) while that of T. serenei has distinct low teeth ( Fig. 61A View FIGURE 61 ). The G1s of T. ocularius and T. atimovatae n. sp., are, however, more slender and proportionately longer ( Figs. 46 View FIGURE 46 , 49 View FIGURE 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 View FIGURE 34 E–G).