Dynomene pilumnoides Alcock, 1900

Published, First, 2009, New records of crabs (Decapoda: Brachyura) from the New Zealand region, including a new species of Rochinia A. Milne-Edwards, 1875 (Majidae), and a revision of the genus Dromia Weber, 1795 (Dromiidae), Zootaxa 2111, pp. 1-66 : 12

Dynomene pilumnoides Alcock, 1900

( Figs. 3a, b)

Dynomene pilumnoides Alcock, 1900:133 ; l90l: 35, pl. 1, fig. 2. — Barnard 1947:

371; 1950: 337, f ig.65 a–c. — Sakai 1965: 12, pl. 6, fig. 2; 1976: 29, pl. 6, fig. 3. — Serène & Vadon l98l:121. — Miyake 1983: 11, pl.4, fig. 2. — Baba 1986: 310, fig. 163. — Garth et al. 1987: 241. — Nagai 1989: 43. – McLay 1999: 494, figs 3c, d, 8d, e, 11, 12e, f, 14c, 17d, 21a–g. — McLay & Ng 2005: 20. — Guinot & Quenette 2005: 282, fig. 4C, D

Maxillothrix actaeiformis Stebbing, 1921: 457 , pl. 14 (Crust. Pl. 109).

Material Examined. Monowai Seamount: 1 female, 10.0 mm x 8.4 mm, 27°12.51'S 177°26.02'E, rock dredge, Tangaroa , stn TAN0411/32, 252– 403m, 7 Oct. 2004. ( NIWA 48574 )

Comparative Material. Fiji: 1 male, 13.5 mm x 11.4 mm, 18°18.4' S, 178°02.5' E, 233–248 m, MUSORSTOM 10, DW1377, 17 Aug. 1998 .

Remarks. Dynomene pilumnoides is the second dynomenid species discovered in New Zealand. D. pilumnoides can be separated from the other dynomenid species, Metadynomene tanensis , by virtue of its 4 sub-acute anterolateral teeth (versus 3 blunt teeth) and the short plumose setae, interspersed with clumps of longer filiform setae, on its carapace (versus short soft setae all about the same length). Species of Dynomene are for the most part found in shallow water, occurring from the intertidal to 100 m. D. pilumnoides has the greatest depth range, 18–400 m, and it has been collected from rocky bottoms covered in Lithothamnion (Rhodophyta) , sponges and corals. The specimen of D. pilumnoides was taken with a rock dredge that also caught Cheiraster sp. (Asteroides) , Bathymodiolus sp. and Branchipolynoe sp. (Polychaeta) in other nearby samples. The Monowai Seamount is part of the Kermadec volcanic system.

The specimen ( Fig. 3b) collected during the MUSORSTOM 10 expedition is a new record for Fiji. The seven species of Dynomene can be identified using the key provided by McLay (2001: 810).

Geographical Distribution D. pilumnoides has a wide Indo-West Pacific distribution that includes Madagascar, Réunion, Australia, Indonesia, Philippines, Japan, Hawaiian Is , New Caledonia, and now Fiji and the Monowai Seamount, New Zealand. Depth range is 18–403m although most records come from 100–300m.