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

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Calipandalus elachys Komai & Chan, 2003


Calipandalus elachys Komai & Chan, 2003 

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

Fig. 6View FIGURE 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. 6CView FIGURE 6) ( 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. 6AView FIGURE 6); orbital margin of carapace with bristle-like setae, suborbital lobe broadly rounded ( Fig. 6AView FIGURE 6); pleura of pleomeres 4 and 5 each with small posteroventral spine ( Fig. 6BView FIGURE 6); telson armed with 4 pairs of dorsolateral spiniform setae (including 1 pair at posterolateral corners) ( Fig. 6BView FIGURE 6); eye large, with conspicuous ocellus ( Fig. 6AView FIGURE 6); pereopods 2 chela with distinct hiatus between fingers proximally; carpi of pereopods 3–5 all shorter than propodi ( Fig. 6DView FIGURE 6); 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. 6EView FIGURE 6). 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.














Calipandalus elachys Komai & Chan, 2003

Komai, Tomoyuki, Ohtsuka, Susumu, Yamaguchi, Shuhei & Nakaguchi, Kazumitsu 2018

Calipandalus elachys

Komai & Chan, 2003 : 883
De Grave & Fransen 2011 : 440