Periclimenaeus holthuisi Bruce, 1969

Bruce, A. J., 2006, Periclimenaeus nielbrucei sp. nov. (Crustacea: Decapoda: Pontoniinae), a new sponge associate from the Capricorn Islands, Queensland, with notes on related Periclimenaeus species, Zootaxa 1224, pp. 1-22 : 12-14

Periclimenaeus holthuisi Bruce, 1969

( Fig. 7 A–F)

Periclimeneus rhodope — Holthuis, 1952: 125 –129, figs. 54–55 bis.

Periclimenaeus holthuisi Bruce, 1969: 159 –160. — Chace and Bruce, 1993: 92. — Li, 2000: 142.

Material examined

1 ovig. Ψ, holotype, CL 7.1 mm, Siboga stn 248, Rumahlusi, Tioor Island, dredge to 54 m, 4/ 5 November 1899, ZMA De. 102519.

Remarks

Body and anterior appendages intact, complete, with only left first pereiopod attached. Detached first pereiopod, both second pereiopods and five ambulatory pereiopods present. Also a full set of dissected mouthparts:

A broad, rounded inferior orbital angle is present; the first abdominal segment is without an anterodorsal lobe; the proximal segment of antennule with well developed ventromedial tooth. The incisor process ( Fig. 7 A) is obliquely truncate distally, with 32 minute subuniform teeth, medially acute, laterally rounded. The first pereiopod fingers are densely setose with strongly hooked tips ( Fig. 7 B), with the cutting edges obsolete, the fixed finger is distally bidentate.. The second pereiopods have the cutting edges of the fingers entire, the minor second pereiopod chela is with the fixed finger non­cannulate. The third pereiopod has the dactyl ( Fig. 7 D) about 0.18 of the propod length, unguis ( Fig. 7 E) distinctly demarcated, robust, curved, about 2.3 times longer than basal width, with 8 small acute ventral denticles, corpus compressed, about 1.5 times longer than basal width, without basal process, dorsal margin feebly convex, ventral margin with laminar subquadrate accessory tooth ( Fig. 7 F) distally, ventral margin with 4 small acute denticles, proximal ventral margin of corpus with 8 small denticles, distal denticles erect, proximal denticles anteroverted; The propod ( Fig. 7 C) is about 5.0 times longer than wide, tapering slightly distally, with a pair of distoventral spines and 13 further spines evenly distributed along the ventral border. Fourth and fifth propods and dactyls similar, unguis/corpus denticulations 8/7, 8/8 respectively, propodal distoventral/ventral spines 2/7, 1/4, respectively, fifth propod with several distal setae.

The major second pereiopod chela has a length of 8.8 mm, the minor chela 5.0 mm. Ova 0.5 mm in length.

The accessory teeth of the ambulatory dactyls appear unique in this genus and resemble those of some species of Onycocaris . The species is known only from the holotype specimen, collected in 1899, and its host is unknown..

Figures

FIGURE 7. Periclimenaeus holthuisi Bruce, 1969, ovigerous female holotype. A, mandible, distal incisor process. B, first pereiopod, finger tips, dactyl uppermost. C, third pereiopod, propod and dactyl. D, same, distal propod and dactyl. E, fourth pereiopod, distal dactyl. F, same, dactylar accessory tooth. Periclimenaeus arthrodactylus Holthuis, 1952, ovigerous female holotype. G, first pereiopod, fingers of chela. H, fourth pereiopod, distal propod and dactyl. I, fifth pereiopod, distal dactyl.