Pseudolambrus lobatus ( Flipse, 1930 )

Lee, Seok Hyun, Park, Jae Hui & Ko, Hyun Sook, 2016, First record of two species of parthenopid crabs (Crustacea: Decapoda: Parthenopidae) from Korean waters, Journal of Species Research 5 (3), pp. 359-363 : 360-362

Pseudolambrus lobatus ( Flipse, 1930)

ỄǕÑŔöNj (ṳAE)

Lambrus (Pseudolambrus) lobatus Flipse, 1930: 48 , 53, fig. 37.

Parthenope (Pseudolambrus) ozakii : Sakai, 1969: 257, fig. 6; 1976: 277, pl. 94, fig. 2.

Pseudolambrus lobatus : Ng et al., 2008: 131 (list).

Material examined. 1♂ (cl 7.2 mm, cw 7.3 mm), Korea: Munsum in Jeju Island, 28 Oct 2014, Park JH, SCUBA diving in about 20m in depth .

Description. Carapace ( Figs. 1B , 3A, B) partly broken,

362 JOURNAL OF SPECIES RESEARCH Vol. 5, No. 3

D A C B

missing right branchial region, subtriangular, depressed, as long as broad; regions indistinct; gastric and cardiac regions each with conical tubercle, gastric and cardiac regions connected saddle like ridge; branchial region flattened, depressed; hepatic margin rounded as lobe; epibranchial margin expanded, convex, dividet into 6 rectangular teeth by narrow fissures; lateral posterior margin with 7 triangular unequal sized teeth; posterior margin produced. Front rounded triangular, directed obliquely downward, concaved and depressed medially.

Left cheliped ( Fig. 3C) robust; merus subrectangular, with 4­5 lamelliform teeth on outer and inner margins; propodus subrectangular, 1.5 times longer than broad, inner margin tuberculated; movable finger curved, 2 small triangular teeth on cutting margin; fixed finger missing.

Third ambulatory leg ( Fig. 3D) short, slender; merus with 6 triangular teeth on anterior margin and 3 teeth on posterior margin; carpus with 2 lamelliform teeth on anterior margin; propodus with tooth on anterior and 2 larmelliform teeth on posterior margins; dactylus with spinules distally.

Color. Generally reddish orange.

Habitat. Broken shelly and sandy bottom at intertidal region.

Distribution. Indonesia, Philippines, Japan and now Korea.

Remarks. Pseudolambrus lobatus ( Flipse, 1930) is the first species in the genus Pseudolambrus Paul’son, 1875 from Korean waters. The genus Pseudolambrus is composed of 15 species ( Ng et al., 2008) and distinguished from other partheonpid genera by having entirely fused hepatic region and a postobital tooth on the carapace, not constricted hepatic and branchial regions, and short chelipeds ( Sakai, 1976). Pseudolambrus lobatus is different from other congeneric species by having a carapace with produced hepatic lobe, an enormous sized with a large lobe on proximal part of right cheliped, and a left cheliped with crossed dactyli ( Sakai, 1976). Althought the present specimen does not have a right cheliped and a fixed finger of the left cheliped, characteristics of the carapace and the left cheliped agree with Sakai (1976) ’s description of this species.

Figures

Fig. 1. Color photographs of two parthenopid crabs. A, Enoplolambrus laciniatus (De Haan, 1839), male (cl 38 mm, cw 38 mm): B, Pseudolambrus lobatus (Flipse, 1930), male (cl 7.2 mm, cw 7.3 mm).