Dynomenidae and Dromiidae (Decapoda, Brachyura) from Guam, Philippine Islands, Tonga and Samoa Author Mclay, Colin L. Zoology Department, Canterbury University, Christchurch, PB 4800 (New Zealand) c. mclay @ zool. canterbury. ac. nz. text Zoosystema 2001 23 4 807 856 journal article 6377 10.5281/zenodo.4689208 72669070-3bd6-41be-bd47-f386c83d0927 1638-9387 4689208 Paradynomene tuberculata Sakai, 1963 Paradynomene tuberculata Sakai, 1963: 231 , fig. 8. — McLay 1999: 543 , figs 4e-f, 6e-f, 7c, e, 10b-d, 14a, 25d, 32a-g. MATERIAL EXAMINED. — Guam . 13°27’N , 144°47’E , North West Luminao Reef, 21 m , among dead coral, 29. V .1993 , coll. H. T . Conley, 22.7 × 21.3 mm , 1 16.1 × 16.1 mm ( GUM 310) ( ZRC 2000.2122). — Piti Lagoon, 1.2-7.5 m , in dead coral, 26. V .1994 , 1 21.7 × 20.0 mm. — Piti Lagoon, 4-8 m , among dead coral, 5. VI .1994 , 1 17.2 × 16.4 mm . — Piti Lagoon, 1.5-5 m , in coral rubble, 12. V .1997 , 1 (ovig.) 20.5 × 19.4 mm . — Luminao Reef, 21-24 m , among coral rubble, 7. V .1998 , coll. H. T . Conley, 1 8.6 × 8.8 mm ( UGI no registration numbers) ( ZRC 2000.0750). SIZE . — Maximum size for males is 22.0 × 22.8 mm , and for females 20.6 × 21.4 mm . The largest male from Guam , 22.7 × 21.3 mm , is about the same size as the largest male. The ovigerous female, 20.5 × 19.4 mm , was carrying about 840 small eggs, diameter = 0.5 mm , indicating that P. tuberculata has a planktonic larval stage. DEPTH AND HABITAT. — Before these specimens were collected from Guam , the known depth range was 35- 402 m , but it now appears that P. tuberculata occurs at shallower depths than previously thought. The depth range is now 1.5-402 m on dead coral and rocky bottoms. DISTRIBUTION. — P. tuberculata is known from the Gulf of Aden in the Indian Ocean, Japan and New Caledonia in the West Pacific and now Guam . DISCUSSION Paradynomene tuberculata has been welldescribed and illustrated by McLay (1999) where a full synonymy can be found. Amongst the dynomenids, it is very distinctive in having a strongly calcified, oblong carapace, with an areolate and granulated surface. McLay (1999) noted the similarities of P. tuberculata to some dromiids like Epigodromia McLay, 1993 . These similarities include the carapace surface, the tridentate rostrum and having a front or “face” with a dromiid conformation. These similarities may indicate evolutionary convergence in the two families wherein the species achieve a cryptic appearance by resembling their coral surroundings McLay (1999: 549) .