Pseudopaguristes hians ( Henderson, 1888 ) Henderson, 1888

Rahayu, Dwi Listyo, 2005, Additions to the Indonesian fauna of the hermit crab genus Pseudopaguristes McLaughlin and a further division of the genus Paguristes Dana (Crustacea: Decapoda: Paguroidea: Diogenidae), Zootaxa 831, pp. 1-42 : 32-34

Pseudopaguristes hians ( Henderson, 1888) n. comb. ( Fig. 12 )

Paguristes hians Henderson, 1888: 79 , pl. 8, fig. 4; Alcock, 1905: 40, pl. 3, fig. 2; Estampador, 1937: 45; Haig & Ball, 1988: 173; Hogarth, 1988: 1100; Morgan, 1990: 21; McLaughlin & Clark, 1997: 46, fig. 14; Rahayu, 2000: 392.

Diogenes desipiens Lanchester, 1902: 366 , pl. 34, figs. 1, 1a.

Not Paguristes hians . — Grant & McCulloch, 1906: 33; McCulloch, 1913: 346 [= Paguristes monoporus Morgan, 1987 ].

Material examined. 3 males 2.5–3.7 mm, 1 female 3.5 mm (without abdomen), Pidjol Bay, Lombok Island, Siboga , stn.33, 24–25 Mar 1899, 22 m ( ZMA); 1 male 2.3 mm, Samalona, Macassar, Th. Mortensen Expedition, 29 Jun 1922, 25 m ( ZMUC)

Diagnosis. Biserial phyllobranchiae. Shield (12 a) longer than broad, rostrum broadly triangular, same length as lateral projections, with acute apex. Ocular peduncles inflated proximally, weakly inflated distally, shorter than shield, longer than antennular and antennal peduncles. Ocular acicles elongate, with two large spines distally. Subquadrate calcified interocular lobe with 3–5 rounded or subacute spinules anteriorly. Antennal flagella shorter than carapace.

Chelipeds ( Fig. 12 b, c) subequal, right slightly larger than left, dorsal and mesial surfaces of dactyl with closely­spaced strong pointed tubercles; dactyl and fixed finger with distinct hiatus. Sparse setae on chelipeds. Pereopods ( Fig. 12 d–f) similar from left to right. Dactyls of second and third pereopods 1.5 length of propodi; carpi of second pereopods each with 6 dorsal spines; carpi of third pereopods each with single dorsodistal spine. Fourth pereopod (12 g) without preungual process.

Male first pleopod reduced ( Fig. 12 h, i), male second pleopod absent, unpaired left pleopods 3 to 5 uniramous. Female with single left gonopore, brood pouch large. Telson ( Fig. 12 j) subquadrate, left and right lobes about the same length, each armed with 4–6 spines, some corneous­tipped.

Type locality. Off Manila, Philippines.

Habitat. Reported from blue mud ( Henderson 1888). The material in this study was collected from mud and coral.

Distribution. Oman, Maldives; Red and Arabian Seas, Malaysia, Philippines, and Lombok Island and Macassar in Indonesia.

Remarks. McLaughlin & Clark (1997) redescribed the holotype of this species as Paguristes hians . They did not confirm the number of gills. The specimens in this collection agree well with the redescription, and examination of gills revealed that the species possesses eight pairs of biserial phyllobranchiae. Paguristes hians is thus transferred to Pseudopaguristes . Pseudopaguristes hians n. comb. shares one character in particular with P. gracilis : the lobe between ocular acicles is calcified and armed with several subacute or blunt spinules anteriorly.

Figures

FIGURE 12. Paguristes hians (Henderson, 1888) n. comb., male 2.5 mm (ZMA): a, shield and cephalic appendages, setae omitted; b, c, left cheliped, setae omitted; d, e, left second pereopod, setae omitted; f, left third pereopod, setae omitted; g, left fourth pereopod, setae omitted: h, i, right first pleopod; j, telson; b, d, mesial view; c, dorsal view; e, f, g, lateral view; h, external view, i, internal view. Scales equal 1 mm.