Periclimenes acanthimerus, A.J.Bruce, 2006

Bruce, A. J., 2006, An unusual new Periclimenes (Crustacea, Decapoda, Palaemonidae) from New Caledonia, Zoosystema 28 (3), pp. 703-712 : 704

Periclimenes acanthimerus n. sp. ( Figs 1-6)

HOLOTYPE. — New Caledonia. BATHUS 1, NO Alis, stn DW 640, 21°52.3’S, 166°47.9’E, 174 m, 10.III.1993, coll. B. Richer de Forges , 1 ♂ (MNHN-Na 14949).

ETYMOLOGY. — From acanthus (Greek), a spine or thorn, and merus (Greek), femur.

DIAGNOSIS. — Rostrum slightly decurved, dentition 7/1,

inferior orbital angle without reflected inner flange, not strongly produced; supraocular teeth and supraorbital spines absent, antennal spine marginal, hepatic spine present; without distinct bec ocellaire; third abdominal segment not strongly posterodorsally produced; cornea globular, fourth thoracic sternite without median process; first pereiopods with fingers of chelae slender, distally subspatulate, rounded and feebly pectinate distally; major second pereiopod with fingers distally entire, dactyl of second pereiopod without lateral flange, carpus equal to about 0.2 of palm length, merus of second pereiopod without distoventral tooth, ventral margin with spinulate tubercles; dactyl of ambulatory pereiopod simply biunguiculate, propods ventrally spinulate, lacking transverse rows of long setae distally; telson with two pairs of dorsal spines.

DESCRIPTION

Medium sized pontoniine shrimp ( Fig. 1) of subcylindrical body form, closely resembling several of the deep water Periclimenes species.

Rostrum ( Fig. 2A) moderately deep, about four times as long as central depth, 0.65 of CL (estimated, extreme rostral tip missing), compressed, reaching to middle of distal segment of antennular peduncle, dorsal carina well developed, extending onto anterior fifth of carapace, margin convex, with seven small acute teeth, size diminishing slightly distally, posterior tooth situated on carapace, with two or three short plumose interdental seta between most teeth; lateral carinae ( Fig. 2B) feebly developed; ventral carina distinct on distal half of rostrum, convex, with single small acute tooth at about 0.7 of length from posterior orbital margin.

Carapace smooth, glabrous, without epigastric and supraorbital spines, orbit feebly developed, inferior orbital angle ( Fig. 2C) well developed, broad, acute in lateral view, antennal spine small, marginal, not exceeding inferior orbital angle, hepatic spine small, larger than antennal spine, at slightly lower level and anterior to level of posterior rostral tooth, anterolateral angle obtusely rounded.

Abdomen smooth, glabrous, third tergite slightly posteriorly produced, fifth segment about 0.65 of sixth segment length, sixth segment about 0.37 of CL, 1.37 times longer than deep, posterolateral angle acute, posteroventral angle subacute, pleura of segments 1-5 broadly rounded, unarmed, margins non-setose.

Telson about 3.3 times longer than anterior width,