Neocallichirus frouini, Ngoc-Ho, 2005

Ngoc-Ho, Nguyen, 2005, Thalassinidea (Crustacea, Decapoda) from French Polynesia, Zoosystema 27 (1), pp. 47-83 : 74-76

Neocallichirus frouini n. sp.

( Fig. 14 )

TYPE MATERIAL. — Holotype: French Polynesia, Tahiti, stn 13, 17°31’25”S, 149°32’08”W, 18 m, mud, 16.I.1995, P. Frouin coll.,, cl. 5.5, tl. 19 mm ( MNHN Th 1432) ( Fig. 14A, B, I, L, M ). Paratypes: stn 15, 17°31’30’’S, 149°32’12’’W, 6 m, fine sand, 5.VII.1994, P. Frouin coll., 4, cl. 4.5 mm, tl. 16 mm ( Fig. 14 C-H, J, K, N), cl. 3.5-4 mm, tl. 12.5-14 mm, 2, cl. 3.5 mm, tl. 12.5 mm ( Fig. 14O ), cl. 3 mm, tl. 11 mm ( MNHN Th 1433).

ETYMOLOGY. — The species is named for Patrick Frouin who collected the material.

OTHER MATERIAL EXAMINED. — Neocallichirus mauritianus (Miers, 1882) : Mauritius. 1880, Robillard coll., 1, cl. 13 mm, tl. 48 mm (MNHN Th 504).

DISTRIBUTION. — Only known from Tahiti.

DIAGNOSIS. — Rostrum very short, no rostral spine; abdominal segments 3-5 with lateral tufts of setae; telson with lateral borders regularly curved, posterior border weakly concave medially, unarmed.

Eyestalk with cornea dorsal, subterminal, disk-shaped; A1 peduncle shorter than that of A2. Mxp3 subpediform with both ischium and merus tapering distally; propodus with rounded lower border, about three or four times as wide as dactylus at proximal third, narrowing distally; dactylus digitiform, slender.

P1 unequal, dissimilar. Major P1 ischium convex with 12-16 lower spinules; merus with dilated lower border, widest in proximal third carrying two or three large spines, narrower distally with five to six spinules; carpus, propodal palm and fixed finger unarmed.

Plp1 uniramous, Plp2 biramous with appendix interna in both sexes; Plp3 with embedded appendix interna. Uropod exopod with rounded posterior border, uropod endopod subquadrate.

Thalassinidea (Crustacea, Decapoda ) from French Polynesia

Ngoc-Ho N.

DESCRIPTION

Carapace ( Fig. 14B ) with very short triangular rostrum, no rostral spine. Abdominal segments 3-5 ( Fig. 14A ) with lateral tufts of setae. Telson ( Fig. 14I ) approximately 1.2 times as wide as long, lateral borders regularly curved, posterior border slightly concave medially, unarmed.

Eyestalk ( Fig. 14B ) with blunt distal tip; cornea dorsal, subterminal, disk-shaped. A1 peduncle shorter than that of A2, reaching about midlength of last A2 article, latter about as long as penultimate; antennal acicle very small. Mxp1 ( Fig. 14J ) epipod tapering distally. Mxp2 ( Fig. 14K ) exopod shorter than merus, small epipod. Mxp3 subpediform ( Fig. 14G, H ) without exopod, both ischium and merus with lower border regularly curved and tapering distally; ischium nearly twice as long as merus bearing weak mesial crest of spinules; carpus as long as merus, lower border rounded; propodus about three or four times as wide as dactylus near proximal third, narrowing distally to digitiform slender dactylus.

P1 unequal, dissimilar. Major P1 ( Fig. 14C ) ischium with convex lower border bearing 12- 16 spinules; merus with dilated triangular lower border, wide in proximal third carrying two or three large spines, narrower distally with five to six spinules; carpus about as long as merus, lower border rounded posteriorly, unarmed; propodal palm approximately one and a half times as long as carpus and twice as long as fingers, unarmed and so is fixed finger; dactylus cutting edge with large flat tooth proximally and small triangular tooth on distal third. Minor P1 ( Fig. 14D ) with all articles unarmed, carpus largest, about twice as long as palm, latter nearly as long as fingers. P2, P3 ( Fig. 14E, F ) as figured, P3 propodus with moderate rounded posterior lobe; P4 and P5 subchelate.

Figures

FIG. 14. — Neocallichirus frouini n. sp., Tahiti; A, B, I, L, M, holotype, (MNHN Th 1432); C-H, J, K, N, paratype (MNHN Th 1433); O, paratype (MNHN Th 1433); A, lateral view; B, anterior part of carapace; C, D, major and minor pereopod 1; E, F, pereopod 2 and 3; G, H, maxilliped 3 and ischium in mesial view; I, telson and uropods; J, K, maxilliped 1 and 2; L, pleopod 1; M, O, pleopod 2;