Pasiphaea debitusae Hayashi, 1999

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: 122

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Pasiphaea debitusae Hayashi, 1999


Pasiphaea debitusae Hayashi, 1999 

[New Japanese name: Kotsuno-shira-ebi]

Figs. 7AView FIGURE 7, 8View FIGURE 8

Pasiphaea debitusae Hayashi, 1999: 281  , figs. 8–10 [type locality: Banda Sea, Indonesia, 605– 576 m].— De Grave & Fransen 2011: 258.

Material examined. T/RV “Toyoshio-maru”, 2010-03 cruise, stn 13, W of Amami-ohshima Island, 28°23.54’N, 129°11.25’E, 0–500 m, bottom depths 683–708 m, 21 May 2010, ORI net oblique tow, 2 females (cl 7.6, 10.8 mm), CBM-ZC 11278.

Additional material. R/V “Hakuho-maru”, KH02-04 cruise, stn S1-B, Sulu Sea, Philippines, 07°56.50’N, 118°10.09’E, 292–296 m, 23 November 2002, beam trawl with 3 m span opening, coll. S. Ohtsuka, 1 female (cl 8.3 mm), 1 ovigerous female (cl 11.2 mm), CBM-ZC 8739.

Coloration in fresh condition ( Fig. 7AView FIGURE 7). Body generally transparent, with scattered red chromatophores on lateral surfaces; dorsal and ventral margins of pleomere 6 reddish; corneas gray. Antennular peduncle and flagella semi-transparent. Antennal peduncle also semi-transparent, with red tinge on basicerite and carpocerite.

Distribution. Previously known with certainty only from the Banda Sea, Indonesia, at depths of 304–605 m (see “Remarks”). The present specimens represent new records of this species from Japan and the Philippines; the bathymetric range is also slightly extended, ranging from 292 to 708 m.

Remarks. Hayashi (1999) reviewed the Pasiphaea sivado ( Risso, 1816)  species group, recognizing the following nine species: P. debitusae Hayashi, 1999  , P. fragilis Hayashi, 1999  , P. gracilis Hayashi, 1999  , P. japonica Omori, 1976  , P. laevis Hayashi, 1999  , P. marisrubri Iwasaki, 1989  , P. philippinensis Hayashi, 1999  , P. propinqua de Man  , 19016, and P. sivado  . Subsequently, Hayashi (2006) described a new species, P. mclaughlinae  from off Taiwan, which was referred to the P. sivado  species group. This informal species group is easily recognized by the possession of a posterodorsal spine on the pleomere 6 within the genus Pasiphaea Savigny, 1816  (cf. Hayashi 1999).

Pasiphaea debitusae  was originally described on the basis of material from the Banda Sea, Indonesia. There have been no subsequent records of this species. The specimens examined in this study are identified with P. debitusae  on account of the following features (cf. Hayashi 1999): rostrum very small, slender, less ascending compared with other species in the P. sivado  species group ( Fig. 8A, BView FIGURE 8); carapace dorsally rounded, with obscure branchiostegal sinus ( Fig. 8AView FIGURE 8); pleomeres all rounded dorsally, pleomere 6 with posterodorsal spine ( Fig. 8CView FIGURE 8); posterior margin of telson truncate; meri of pereopods 1 and 2 with 4–7 and 6–13 spiniform setae, respectively, included generally within variation range previously reported ( Fig. 8D, EView FIGURE 8); ischium of pereopod 2 with 1 spiniform seta on ventral margin ( Fig. 8EView FIGURE 8); and no pleurobranch on thoracomere 8. Our specimens represent the second record of the species since the original description.

Hayashi (1999) suggested that specimens from the Andaman Sea, identified with P. sivado  by Wood-Mason (1892) and Wood-Mason & Alcock (1893), might represent P. debitusae  , but this needs to be verified by examination of the voucher material.


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Pasiphaea debitusae Hayashi, 1999

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

Pasiphaea debitusae

Hayashi, 1999 : 281
De Grave & Fransen 2011 : 258