Description of New Genera and Species of Japanese Crabs, Together With Systematically and Biogeographically Interesting Species (I)

First report of two rare xanthid crabs (Crustacea: Decapoda: Brachyura: Xanthidae) from Pakistan

“…Guinot (1976: 204) was the first to exclude A. echinus from the genus Actaea, although she did not establish any new taxa for this species. Actaea echinus was eventually transferred by Sakai (1983) to a new genus, Odhneria, along with the type species, O. acutidens Sakai, 1983. He (Sakai, 1983: 13) provided a short diagnosis distinguishing this genus from Actaea: 'The carapace of this new genus is a little broader than long, compared with that of Actaea, the proportion between length to breadth being 1:1.5, while that of Actaea is 1:1.4.…”

A new species of the genus Ilyograpsus, I. vanninii sp. nov. (Brachyura, Grapsidae) from Somalia

“…-The type specimen of I. nodulosus Sakai, 1983 from Iriomote Island is known to be missing, but the present specimens collected from Kochi are identified as I. nodulosus by the feature of the carapace surface. In the specimens from Kochi, the gastric and cardiac regions are, respectively, distinctly convex, transversely separated by a distinct notch, and bordered longitudinally, by an obscure notch, from the slightly convex branchial region.…”

“…However the new species is clearly different from I. paludicola (Rathbun, 1909), because in I. vanninii several oblique ridges are present in the lateral part of the branchial region; the 2 nd tooth of the anterolateral margin of the carapace shows a low, triangular tooth; and the 3 rd anterolateral tooth is tipped with a small, anteriorly directed distal tooth; the carapace width at the level of the orbital teeth is about the same as the largest carapace width. However, in I. paludicola the carapace regions are beset with obscure tubercles and a few oblique ridges are present in the lateral part of branchial region; the 2 nd and 3 rd distinct, lateral teeth of the carapace are protruded laterally, and especially the 3 rd lateral tooth is in the shape of a strong, (Rathbun, 1909) and I. nodulosus Sakai, 1983. A, I. nodulosus, BLT 18322, ovig.…”

“…The carapace bears one tubercle in the hepatic region, and two tubercles obliquely on the branchial region as seen in I. nodulosus. Sakai's (1983) specimens, a male and a female, were incomplete, i.e., without pereiopods, so the present specimen from Kochi is used to describe the pereiopods.…”

“…The crab genus Ilyograpsus is known to comprise three species, Ilyograpsus paludicola (Rathbun, 1909) from Thailand, I. rhizophorae Barnard, 1955 from Mozambique, and I. nodulosus Sakai, 1983 from Japan. In the course of this study, it has turned out that two ovigerous specimens from Abo, Somalia, stored under the name of I. paludicola, are very different from the female holotype of I. paludicola in the form of the carapace and of the orbit.…”