Calipandalus elachys Komai & Chan, 2003

Komai, Tomoyuki, Ohtsuka, Susumu, Yamaguchi, Shuhei & Nakaguchi, Kazumitsu, 2018, New records of six deep-sea caridean shrimps (Crustacea: Decapoda) from the Ryukyu Islands and its adjacent waters, southwestern Japan, Zootaxa 4457 (1), pp. 114-128 : 120-122

Calipandalus elachys Komai & Chan, 2003

[New Japanese name: Adeyaka-hime-jinken-ebi]

Fig. 6

Calipandalus elachys Komai & Chan, 2003: 883 , figs. 1–4 [type locality: Taiwan, 267–302 m].— De Grave & Fransen 2011: 440.

Material examined. T/RV “Toyoshio-maru”, 2001-06 cruise, stn 7-1, W of Amami-ohshima Island, 28°21.23’N, 129°13.60’E, 285–288 m, 27 May 2002, beam trawl, coll. T. Komai, 1 female (cl 4.0 mm), CBM-ZC 10624.

Distribution. Previously known from SE of Taiwan, Solomon Islands and New Caledonia, suggesting a wide geographical range in the western Pacific; at depths of 229–373 m ( Komai & Chan, 2003). The present specimen

represents the first record of this species from Japanese waters, slightly extending the geographical range to the north.

Remarks. Calipandalus elachys , the type species of the monotypic genus Calipandalus Komai & Chan, 2003 , resembles species of Plesionika Spence Bate, 1888 in having thin, elongate maxilliped 3 and pereopods 1, 3–5. Nevertheless, it is immediately distinguished from Plesionika by the absence of an exopod on the maxilliped 3 ( Fig. 6C ) ( Komai & Chan, 2003). Other characters diagnosing C. elachys include: rostrum reaching only to distal margin of article 1 of antennular peduncle (less than half of carapace length), armed dorsally with 9–11 spines of which 5–7 on carapace bearing basal suture and ventrally with 2 or 3 tiny subdistal spines ( Fig. 6A ); orbital margin of carapace with bristle-like setae, suborbital lobe broadly rounded ( Fig. 6A ); pleura of pleomeres 4 and 5 each with small posteroventral spine ( Fig. 6B ); telson armed with 4 pairs of dorsolateral spiniform setae (including 1 pair at posterolateral corners) ( Fig. 6B ); eye large, with conspicuous ocellus ( Fig. 6A ); pereopods 2 chela with distinct hiatus between fingers proximally; carpi of pereopods 3–5 all shorter than propodi ( Fig. 6D ); dactyli of pereopods 3–5 short, less than 0.2 times as long as propodi, poorly armed on flexor margin (at most 1 or 2 minute spiniform seta present) ( Fig. 6E ). The present specimen lacks pereopods 2, but otherwise well agrees with C. elachys in the diagnostic characters mentioned above; the rostrum has 10 dorsal spines, including 5 postrostral, and 2 tiny ventral subdistal spines, included well within the known variation range. The tegmental scales on the

carapace, telson and antennal scales, mentioned in the original description, are not seen in the present specimen, but minute pits representing the basal sockets of the tegmental scale are seen.

The present specimen represents the second record of the species since the original description.

Figures

FIGURE 6. Calipandalus elachys Komai & Chan, 2003, female (cl 4.0 mm), CBM-ZC 10624. A, carapace and cephalic appendages, lateral view; B, pleomeres 5, 6 and telson, lateral view; C, left maxilliped 3, lateral view; D, right pereopod 3, lateral view; E, same, dactylus, lateral view.