Indopinnixa kasijani Rahayu & Ng, 2010, n. sp.
Creators: name: Rahayu, Dwi Listyo
name: Ng, Peter K. L.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Pinnotheridae
Indopinnixa
Indopinnixa kasijani

description: Indopinnixa kasijani n. sp.
(Figs. 1–3)
Material. Holotype: male (3.65 × 1.90 mm) (MZB Cru 2661)), apparently free living in shell and coral debris in intertidal seagrass area, Ekas, East Lombok, Indonesia, coll. 23 July 2009. Paratype: 1 ovigerous female (5.20 × 2.60 mm) (ZRC 2010.0097), same locality as holotype.
Description. Carapace (Figs. 1 A, B, 2A) 1.92 (male), 2.0 (female) times broader than long; frontal margin slightly bilobed, about 0.17 times carapace width. Antero-, posterolateral margins separated by large protuberance directed outwards. Anterolateral margin defined by crest of small tubercles starting at base of P3, ending at swollen hepatic lobe adjacent to orbit; posterolateral margin smooth; posterior carapace margin straight. Dorsal surface of carapace convex anteriorly, posteriorly; smooth, without indication of regions except for short transverse ridge on hepatic region, shallow depression in gastro-cardiac area. Orbit smooth, entire, row of low granules at inner edge; ocular peduncles short, stout, corneas large, distinctly pigmented. Antennae long, flagellum entering orbital hiatus. Epistome narrow. Third maxilliped (Fig. 3 E, F) with bladelike dactylus, propodus spatulate, prominently produced laterally; carpus slender, merus relatively broad; dactylus, propodus, carpus with very long setae, setae relatively shorter on merus. Exopod with sharp protuberance midlength of outer margin; flagellum 2-segmented, with long setae on tip (Fig. 3 E).
Chelipeds subequal, right larger (Fig. 2 B); fingers relatively stout, pointed tips crossing when closed, forming large hiatus; dactylus smooth, sparse setae on upper margin, cutting edge with large teeth proximally; fixed finger smooth, cutting edge with several moderately small teeth; palm smooth, outer surface with longitudinal median ridge, covered by short, sparse setae; inner surface with longitudinal row of setae near lower margin; carpus smooth, row of setae on upper margin; inner lower margin of merus with row of small tubercles, plumose setae, upper margin with row of plumose setae.
P2, P3 (Fig. 2 C, D) of similar form, slender, shorter than P4; dactylus longer than propodus, merus long, about 3.5–4.0 times as long as broad, dorsal, ventral margins with short setae; P4 wide (Fig. 2 E), dactylus slightly longer than propodus, dorsal margin of propodus with row of minute tubercles, ventral margin bicarinate; carpus smooth; merus wide, 2 times as broad as long, dorsal, ventral margins with row of minute tubercles; P5 shortest (Fig. 2 F), smooth except for row of tubercles on ventral margin of merus; dorsal, ventral margins of all articles of P4, P5 with long plumose setae.
Male abdomen (Fig. 3 C) relatively broad, telson broader than sixth somite, distal margin sinuous; sixth, fifth somites fused but with visible shallow suture; fourth somite with lateral margin deeply concave, broader basally; third somite broad, first, second somites relatively short. Female abdomen broad (Fig. 3 D), with 6 free somites, telson, without constriction. G1 (Fig. 3 A, B) relatively long, long apical process with distal part curved, tip rounded; G2 very short.
Etymology. This species is named after the late Kasijan Romimohtarto, one of Indonesia’s first carcinologists, who worked mainly on crabs, notably on the taxonomy of the Dorippidae and Eumedoninae (Pilumnidae).
Habitat. The species was collected by sieving substrate consisted of sand, shell and coral debris in seagrass bed area during low tide. It was not associated with an annelid, sipunculid or any other invertebrate. It is possible, however, that the crabs were associated with a small host that was not observed and the crabs were separated during collection.
description: Published as part of Rahayu, Dwi Listyo & Ng, Peter K. L., 2010, Two new species of Indopinnixa Manning & Morton, 1987 (Crustacea: Brachyura: Pinnotheridae) from Lombok, Indonesia, pp. 59-68 in Zootaxa 2478 on pages 61-63, DOI: 10.5281/zenodo.195368