Dimorphostylis

Akiyama, Tadashi, 2011, The Cumacean Dimorphostylis elegans Gamô, 1960 (Crustacea), D. bathyelegans n. sp. and D. brevicarpus n. sp. from Japan, Zootaxa 2994, pp. 45-59 : 50

Dimorphostylis sp.

( Fig. 4 )

Material examined. 1 preparatory female, 5.3 mm, dissected (NSMT-Cr 21690), off Kii Peninsula, 33˚27.01´N, 135˚34.15´E, 411–450 m (KT-05-30, St. SS-1), 25 November 2005; 1 young male, 3.8 mm (NSMT-Cr 21691), south of Omae-zaki, Honshu Island, 34˚17.55´N, 138˚14.46´E, 443.4 m (KT-04-6, St. KS-2-1), 30 April 2004.

Remarks. The female specimen, similar to Dimorphostylis elegans , is characterized by (1) the carapace being furnished with 4 horns on anterior and posterior end of dorso-lateral ridges ( Fig. 4 A, B), (2) uropod peduncle nearly 3 times long as the endopod ( Fig. 4 C). A sediment sample (KT-04-6, St. KS-2-1) included a young male with the horny carapace and a preparatory female of D. elegans with the normal shape of carapace. Although the other morphological characters of the female specimen agree with D. elegans , the horny carapace can not be explained as morphological variation.

Figures

FIGURE 4. Dimorphostylis sp., preparatory female. A, carapace, dorsal view; B, carapace, lateral view; C, uropod with pleonite 6.