Abstract
The examination of a collection of benthic macroinvertebrates from the Gulf of Thailand led to the erection of two new species of cumaceans (Crustacea), namely Pseudosympodomma carinatum sp. nov. (Vaunthompsoniinae, Bodotriidae) and Paradiastylis capillata sp. nov. (Diastylidae). Among the four species of the genus Pseudosympodomma , P. carinatum sp. nov. is related to P. indicum by having the first uropodal endopod article shorter than the second, but differs from it in lacking spines on the articles of the third maxilliped, as well as in having a high number of setae on the mandible and a more developed median carina on pedigerous somites two to four. The genus Paradiastylis is characterized by the absence of an exopod on the third maxilliped of females. Among the species of the genus, P. capillata sp. nov. is related to P. bathyalis by lacking folds in the carapace and having a long telson with a cylindrical pre-anal part. However, the two species may be differentiated by the relative length of the uropod endopod (longer than the exopod in P. capillata ) and the basis of the third maxilliped (non-distally produced in P. bathyalis )
Highlights
The tropical Indo-West Pacific Region has been considered as being among the areas containing the highest biodiversities in the world from the point of
Thanks to the macrobenthic samples collected by the French company CREOCEAN as part of a large environmental monitoring carried out in the Gulf, the present paper fully describes and illustrates two new species of Cumacea (Crustacea), namely Pseudosympodomma carinatum sp. nov
The two species may be differentiated by the relative length of the uropod endopod (longer than the exopod in P. capillata) and the basis of the third maxilliped (non-distally produced in P. bathyalis)
Summary
The tropical Indo-West Pacific Region has been considered as being among the areas containing the highest biodiversities in the world from the point of view of terrestrial vegetation (Myers et al, 2000), but this seems to be true for the marine environment (Clarke and Crame, 1997; Gray, 2001). certainly potentially rich, the cumacean fauna of the region is, little known.TWO NEW CUMACEANS FROM THAILAND 407Expedition (Calman, 1905) and from the specimens of the Gulf of Siam collected by Th. The cumacean fauna of the region is, little known. Expedition (Calman, 1905) and from the specimens of the Gulf of Siam collected by Th. Mortensen for the Zoological Museum of Copenhagen (Calman, 1907, 1911). Later on, Fage (1945) studied the littoral species from the coast of Vietnam and Jones (1969) those from deep water collected by the Galathea Expedition. Petrescu (1992, 1995, 1997a) published the results of the “Grigore Antipa” Natural History Museum expedition to Indonesia, and described four new species from Malayan waters (Petrescu, 1997b). Watling and Angsupanich (2002a) described a new species from the Andaman Sea
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