Typhlocarcinodes integrifrons
Creators: name: Ng, Peter K. L.
name: Rahayu, Dwi Listyo
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Chasmocarcinidae
Typhlocarcinodes
Typhlocarcinodes integrifrons

description: Typhlocarcinodes integrifrons (Miers, 1881)
(Figs. 4G, H, 5L, 6F, 36–39)
Typhlocarcinus integrifrons Miers, 1881: 260, pl. 14, fig. 1.
Typhlocarcinodes integrifrons — Alcock 1900: 326.— Tesch 1918: 227.— Monod 1956: 356, 632, figs. 466–468.— Longhurst 1958: 88.— Forest & Guinot 1966: 87, fig. 8a-c.— Crosnier 1967: 334.— Manning & Holthuis 1981: 165.— Ng 1987: 92.— Ng et al. 2008: 76.
Material examined. Lectotype: male (8.5 × 6.9 mm) (NHM 81.24 a), Goree I., Senegambia (= Senegal). Paralectotype: 1 female (7.0 × 5.4 mm) (NHM 81.24 b), same data as lectotype.
Diagnosis. As for genus.
Re-description. Carapace subquadrate; dorsal surface convex, covered with small granules, denser on branchial regions, lower on gastric regions; regions separated by low but distinct grooves (Fig. 36A, 37). Front relatively broad, margin divided into 2 low rounded lobes, with longitudinal groove (Fig. 37). Anterolateral margin arcuate, granular, hirsute, with 2 low but granuliforn lobes, barely demarcated from posterolateral margin (Fig. 37). Posterolateral margins gently convex, subparallel (Fig. 37). Posterior carapace margin gently concave (Fig. 37). Epistome narrow, partially sunken (Fig. 38B). Basal antennal article transversely rectangular, distinctly wider than long; article 4 distinctly dorsoventrally flattened, twice as long as broad, margins with numerous long plumose setae (Fig. 6F). Basal antennal article 3 rectangular, longer than wide; article 3 elongated, longer than broad; article 4 slender, dorsoventrally flattened, twice as long as broad, margins with long plumose setae (Fig. 6F). Basal antennular article rectangular; antennules folding almost vertically (Fig. 6F). Eye mobile, completely filling orbit; pear-shaped, tapering gradually to small pigmented cornea; peduncle stout (Fig. 38B, 39C).
Third maxillipeds relatively short, stout, closing buccal cavern; ischium rectangular, longer than merus with shallow oblique submedian sulcus; merus convex, quadrate, slightly broader than long, anterolateral angle rounded; exopod relatively narrow, reaching to midlength of merus, with long flagellum (Figs. 5L, 39B).
Male chelipeds unequal, one larger than other; outer surface of chela with large tubercles, more or less arrange in longitudinal row, with very short setae; dactylus long, 1 large tooth, 2 small teeth on cutting edge, outer face with longitudinal ridge medially; propodal finger with longitudinal ridge medially on outer surface, cutting edge with small teeth subdistally (Figs. 37A, 38D, E).
Ambulatory legs relatively short, third leg longest; dorsal, ventral margins with long setae, outer surface with short setae; dactylus slightly longer than propodus (Fig. 37).
Male thoracic sternum relatively wide, st1, 2 completely fused to form triangular plate, st3 separated from st2 by narrow, suture; st3, 4 visibly separated by shallow oblique grooves joining at end of sterno-abdominal cavity; sutures 4–7 complete, st7, 8 separated by narrow mobile plate that covers, fused with penis; sterno-abdominal cavity relatively deep; press-button mechanism for holding male abdomen present as small sharp tubercle on anterior third of st5 (Fig. 38A, C).
Male abdomen relatively wide; a1 very broad, wide medially, tapering laterally to form acutely triangular structure, reaching to cx5; a3–5 fused, sutures visible laterally, medially; a3 expanded laterally to form triangular structure, reaching third of st7; a4 with lateral side slightly convex, a5, 6 rectangular, lateral sides straight; telson triangular, broader than long, tip rounded (Figs. 38C, 39A).
Gl stout, gently sinuous, proximally dilated, distal third more slender than proximal, tip gently tapering, with subdistal spinules (Fig. 39D–G, I, J). G2 as long as G1, slender, distal segment half length of proximal segment narrower, tapering at tip (Fig. 39H, K).
Female chelae subequal; outer surface of chelae with small tubercles; fingers not distinctly gaping (Fig. 37B). Female abdomen relatively narrow, 6 somites free, telson (Fig. 4G); vulvae round with small operculum (Fig. 4H).
Colour. Not known.
Remarks. The species was described on the basis of one male measuring “nearly 9 mm ” by 7 mm, and a smaller female (Miers 1881: 260). The material on hand agrees well with these measurements. No holotype was selected so both specimens are synytypes. The male syntype is here designated the lectotype of Typhlocarcinus integrifrons Miers, 1881.
The figures in Miers (1881: pl. 14, fig. 1) (Fig. 36) are not accurate, with the carapace depicted as more quadrate, the dorsal surface prominently granulated, the front more strongly produced, the anterolateral margins are entire, and the ambulatory legs proportionately longer (cf. Figs. 37, 38).
Distribution. Described from Senegal (Miers 1881; Monod 1956), the species has since been reported from Guinea (Monod 1956), Ivory Coast (Crosnier 1967), Sierra Leone (Monod 1956; Longhurst 1958), Ghana (Forest & Guinot 1966; Manning & Holthuis 1981), Dahomey (Crosnier 1967) and Principe I. (Forest & Guinot 1966); from depths of between 12– 100 m.
description: Published as part of Ng, Peter K. L. & Rahayu, Dwi Listyo, 2014, Revision of the family Acidopsidae Števčić, 2005, and the systematic position of Typhlocarcinodes Alcock, 1900, Caecopilumnus Borradaile, 1902, and Raoulia Ng, 1987, with descriptions of two new genera and five new species (Crustacea: Brachyura: Goneplacoidea), pp. 1-63 in Zootaxa 3773 (1) on pages 54-60, DOI: 10.11646/zootaxa.3773.1.1, http://zenodo.org/record/4909796