Clibanarius harisi, Rahayu, 2003

Rahayu, D. L., 2003, Hermit crab species of the genus Clibanarius (Crustacea: Decapoda: Diogenidae) from mangrove habitats in Papua, Indonesia, with description of a new species, Memoirs of Museum Victoria 60 (1), pp. 99-104 : 101-103

Clibanarius harisi sp. nov.

Figure 1

Material examined. Holotype. Stn EM 334, 4º49.39'S, 136º38.10'E, 2.7–6.9 m, otter trawl, 14 Feb 2000, 1 female, 6.8 mm, A. Haris ( MZB Cru 1500).

Paratypes. Stn EM 279, 04º48.15'S, 136º50.59'E, 4.5–5.7 m, otter trawl, 7 and 14 Feb 2000, 2 males, 10.1 and 6.5 mm, 1 female, 8.2 mm, A. Haris ( ZRC 2002.0271 ); collected with holotype, 1 male 11.1 mm ( MZB Cru 1501); Pulau Kamora, intertidal, 8 Jun and 16 Oct 2000, 2 males, 2.5 and 3.2 mm, 3 females, 2.4, 4.0 and 4.1 mm, D.L. Rahayu ( RCO Ca 0101) .

Other material. Stn EM 275, 04º52.67'S, 136º47.22'E, 5.4-7.2 m, otter trawl, 17 Dec 1997, 1 male 5.1 mm, K. Hortle ( PTFI) ; Poriri , intertidal, 15 Feb and 4 Aug 1999, 1 male, 6.1 mm 1 female, 11.1 mm, A. Haris ( MNHN) ; stn EM 430, 04º56.48'S, 137º3.19'E, 3–4 m, trawl, 16 Feb and 17 Mar 2000, 1 male, 5.1 mm, 1 female, 2.7 mm, A. Haris ( RCO 0105 ) ; stn EM 332, 04º48.61'S, 136º39.14'E, 1.8–5.4 m, otter trawl, 14 Feb 2000, 1 female, 6.2 mm, A. Haris ( PTFI) ; stn EM 772, 04º56.84'S, 137º7.39'E, 6 m, otter trawl, 19 Mar 2000, 1 male, 6.6 mm, A. Haris ( PTFI) .

Description. Shield slightly longer than broad; dorsal surface with scattered tubercles and sparse tufts of setae, lateral margins rounded and armed with 2 or 3 teeth. Rostrum triangular, acute, longer than lateral projections, exceeding bases of ocular acicles. Lateral projections broadly triangular terminating in 1or 2 small teeth.

Ocular peduncles slender, inflated basally, about 0.8 length of shield, reaching distal 0.8 of antennular peduncles. Corneas weakly dilated, diameter approximately 0.16 length of peduncles. Ocular acicles small, triangular, with 4 or 5 marginal spines.

Antennular peduncles slender; ultimate, penultimate and basal segments unarmed.

Antennal peduncles reaching distal 0.8 of ocular peduncles. First segment short with small spinule on distolateral margin; second segment with dorsolateral distal angle produced, terminating in small spine; 1 spinule on distomesial margin; third segment with ventrodistal spine; fourth segment with small dorsodistal spine; fifth segment unarmed. All segments with scattered setae. Antennal acicles exceeding base of fifth peduncular segment, terminating in acute spine; mesial margin with 5 corneous spines.

Chelipeds subequal, right slightly larger than left, armament similar, scarcely setose. Merus with row of crenulations along dorsal margin; ventrolateral margin with large and pointed tubercles, 2 strong spines distally; ventromesial margin with row of tubercles, 1 strong pointed tooth proximally. Carpus half length of merus, dorsomesial margin with 3 strong spines and 2 weak tubercles; dorsal surface with scattered large and small tubercles; mesial and ventral faces nearly smooth. Palm as long as or slightly longer than carpus, dorsomesial margin with longitudinal row of spines; dorsal surface with irregular, widely-spaced longitudinal rows of spines, dorsolateral face with irregular rows of pointed tubercles, continuing onto fixed finger; mesial face with blunt tubercles. Fixed finger slightly broader than dactyl; cutting edge with large median tooth followed by smaller teeth, terminating in large corneous claw; dorsal surface covered with conical tubercles. Dactyl slender, as long as or slightly shorter than palm; cutting edge with large median tooth followed by smaller teeth, terminating in large corneous claw; dorsal surface with row of pointed tubercles, decreasing in size distally; dorsomesial margin with row of pointed tubercles; mesial face with row of tubercles.

Second and third pereopods sparsely setose, moderately long, generally similar from left to right. Second pereopods with meri almost 1.5 times length of carpi; dorsal margins unarmed, ventral margins each with 1 strong distal spine and row of spinules proximally. Carpi 0.7 length of meri, dorsodistal margins each with 1 strong, corneous-tipped spine and 1 weaker spine. Propodi slender, 1.4 length of carpi, 3.6 longer than wide, unarmed, lateral faces slightly flattened. Dactyls slightly curved, 1.3 length of propodi, terminating in small corneous claws; dorsal margins each with shallow longitudinal groove and dense and stiff tufts of setae; lateral faces each with 3 shallow longitudinal grooves: first groove 0.75 length of dactyl; second groove wider, 0.5 length of dactyl; third groove longer and very narrow; mesial faces each with 1 longitudinal groove; ventral margins each with row of spinules in distal half. Third pereopods stouter than the second; meri each with distal spine on ventral margin; carpi 1.8 length of meri, dorsodistal margins each with strong, corneous-tipped spine; propodi stout, 1.2 length of carpi, 2.7 longer than wide, unarmed, lateral faces slightly flattened; dactyls 1.5 longer than propodi; grooves on dorsal margins and lateral faces, and row of spinules on ventral margins similar to second pereopods.

Telson with asymmetrical posterior lobes, left longer than right, separated by shallow median cleft; terminal margins each with strong spines, smaller spines on right margin.

Colour in life. Shield yellowish-white with 2 brown spots on dorsal surface. Ocular peduncles light olive-green with 3 longitudinal brown stripes: 1 broad stripe on dorsal surface, tapering distally, broadened proximally; lateral and mesial faces each with 1 narrow stripe. Penultimate segments of antennular peduncles bluish-brown, ultimate segments brown. Antennal peduncles and antennal acicles brown. Chelipeds generally greenish-brown; meri, carpi and palms greenish-brown with blue spines; fixed fingers and dactyls light brown or red-brown with bluish-white spines, claws black. Meri and carpi of second and third pereopods dark greenish-brown; propodi and dactyls greenish-brown. In smaller specimens, dactyls and propodi greenish-orange.

In alcohol, chelipeds, pereopods and ocular peduncles redorange. Longitudinal stripes on ocular peduncles dark red.

Etymology. This species is dedicated to Mr Abdul Haris who collected most specimens of this species.

Distribution. South coast of Papua, Indonesia; 0–7.2 m depth.

Remarks. Most species of Clibanarius that possess longitudinal stripes on the dorsal surfaces of the ocular peduncles also have longitudinal stripes on the second and third pereopods, such as Clibanarius ambonensis , C. antennatus , C. bistriatus Rahayu and Forest, 1992 , C. clibanarius (Herbst, 1791) , C. eurysternus (Hilgendorf, 1878) , C. fonticola McLaughlin and Murray, 1990 , C. infraspinatus (Hilgendorf, 1869) , C. padavensis De Man, 1888 , C. rhabdodactylus Forest, 1953 , C. signatus Heller, 1861 , C. taeniatus (Milne Edwards, 1848) , and C. zebra Dana, 1852 . However, C. harisi possesses longitudinal stripes on the dorsal surface of the ocular peduncles, and lacks longitudinal stripes on the pereopods. The most similar species to C. harisi is C. infraspinatus . Both species possess a strong spine on the ventromesial margins of the meri of the chelipeds, and longitudinal stripes on the dorsal surfaces of the ocular peduncles. Clibanarius harisi differs from C. infraspinatus by the presence of longitudinal sulci on the lateral faces of the dactyls of the second and third pereopods, the absence of row of spines on the dorsal margin of the carpus of each second pereopod and the absence of longitudinal stripes on the lateral faces of the second and third pereopods. In addition, the shield of C. infraspinatus is more elongate and the spines on the propodi of the chelipeds are stronger than in C. harisi .

The coloration preserved in alcohol is uniform red, similar to C. clibanarius described by De Man (1888: 237) based on specimens in the Berlin Zoological Museum. The photograph of the type specimen of C. clibanarius from the Berlin Zoological Museum given by Sakai (1999) has no visible longitudinal stripes on the pereopods. However, McLaughlin (pers. comm.) examined the type specimen and confirmed the presence of faint longitudinal lines on the ocular peduncles and pereopods as mentioned by Alcock (1905). The presence of faint longitudinal stripes on the pereopods, and the absence of a strong spine on the ventromesial margin of the meri of the chelipeds distinguish C. clibanariu s from C. harisi .

Figures

Figure 1. Clibanarius harisi sp. nov. Holotype, female, 6.8 mm (ZRC Cru 1500). a, shield and cephalic appendages, dorsal view; b, left cheliped, dorsomesial view; c, left cheliped, lateral view; d, left chela, dorsal view; e, second left pereopod, lateral view; f, third left pereopod, lateral view; g, telson, dorsal view. Scale = 2 mm. Setae omitted except on third left pereopod.