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Author: Katsushi Sakai
The present section, Callianassida Dana, 1852, has recently been separated from the Thalassinida Dana, 1852; together these two sections constitute the infraorder Thalassinidea within the Decapoda. The section Thalassinida includes one superfamily, Thalassinoidea Dana, 1852, which is not considered herein. The Callianassida include two superfamilies, Axioidea Huxley, 1879 and Callianassoidea Dana, 1852. Those two superfamilies are reviewed according to the presence or absence of a rostral carina; cardiac sulcus(i); cardiac prominence; dorsal oval of the carapace; linea thalassinica; setal rows on carapace, abdomen, tail-fan, and pereiopods; the posterior whip of the maxilla 2 scaphognathite; a dorsal plate or lateral notch on the uropodal exopod; the male Plp1-2; and a median tooth of the prepyloric ossicle. In the present new classification, the section Callianassida thus comprises two superfamilies, Axioidea and Callianassoidea, 19 families including one new family and two families with a new status, 8 subfamilies including one subfam. nov., 116 genera including 41 gen. nov. and 8 genera sensu nov., and 419 species including 12 spp. nov. and 2 nom. nov.
Author: Katsushi Sakai
In this work, the composition of the family Upogebiidae is reasessed and the classification of its included taxa is critically reviewed. The material examined mainly originates from the collections of the Forschungsinstitut Senckenberg, Frankfurt am Main and the Zoological Museum of the University of Copenhagen, comprising samples from the Galathea Expedition 1950-1952, Dr. Th. Mortensen's expeditions, including the Java South African Expedition 1929-1930, and Dr. G. Thorson's Persian expedition. In all, two subfamilies, 11 genera and 157 species are represented in this revision.
The status of the various taxa recognized is placed in the broader context of a re-evaluation of the contents of the infraorder Thalassinidea.
The contents of the book are not only of interest for systematists but also for ecologists and environmental biologists focusing on neritic and benthic biocoenoses, as these mud shrimps are important agents in bioturbation processes of the sea floor.
Author: Katsushi Sakai
In this work, the composition of the superfamily Callianassoidea is reassessed and the classification of its included taxa is critically reviewed. The material examined mainly originates from the collections of the Zoological Museum of the University of Copenhagen, and comprises samples from the Galathea Expedition 1950-1952, Dr. Th. Mortensen’s expeditions, including the Java-South African Expedition 1929-1930, and Dr. G. Thorson’s Persian expedition. In all, three of the possibly five families currently incorporated in the Callianassoidea, i.e., Callianassidae, Gourretiidae, and Ctenochelidae, with a total of 12 subfamilies, 20 genera, and 219 species, are represented in this comprehensive revision.
The status of the various taxa recognized is placed in the broader context of a re-evaluation of the contents of the infraorder Thalassinidea, in which characters derived from the anatomy of the gastric mill may play a pivotal role.
The contents of the book are not only of interest for systematists but also for ecologists and environmental biologists focusing on neritic and benthic biocoenoses, as these mud shrimps are important agents in bioturbation processes of the sea floor.
Author: Katsushi Sakai

Abstract

An adult specimen of Upogebia pugnax is described, and the occurrence of the species in Japan is confirmed. New Caledonian specimens previously assigned to U. pugnax probably belong to a new species.

In: Crustaceana
In: Crustaceana
Author: Katsushi Sakai

A biodiversity workshop under the title “International Workshop on the Crustacea of the Andaman Sea” was held at Phuket Marine Biological Center (PMBC), Phuket, Thailand, from 29 November to 20 December 1998 in the framework of the Thai-Danish BIOSHELF programme, running from 1996 to 2000. Material of the decapod crustacean families Callianassidae Dana, 1852 and Upogebiidae Borradaile, 1903, collected in 1996 and 1998, has been made available for study. As a sequel to the report on the callianassid collections, published in 2002 (Phuket Marine Biological Center Special Publication, 23(2): 461-532 [2002]), the upogebiid collections, are treated in the present paper, with as a result records of seven species of the genus Paragebicula Sakai, 2006, including five new species, and three species of the genus Upogebia Leach, 1814, including two new species. All species are presented in revised keys to the subfamilies, genera, and species of the family Upogebiidae Borradaile, 1903.

In: Crustaceana
Author: Katsushi Sakai

The genus Laomedia De Haan, 1841 of the family Laomediidae Borradaile, 1903 includes four known species, L. astacina De Haan, 1841, L. healyi Yaldwyn & Wear, 1970, L. paucispinosa Ngoc-Ho, 1997, and L. barronensis Ngoc-Ho & Yaldwyn, 1997. Herein, a fifth, possibly new species is described that, because of the lack of undamaged, adult specimens and the absence of locality data, is designated provisionally as Laomedia sp. A. Furthermore, an extended description of Laomedia astacina is provided, based on new material from Japan and also a newly revised key to the species of the genus Laomedia is presented. In addition, a new genus, Heteroaxianassa gen. nov., is proposed.

In: Crustaceana
Author: Katsushi Sakai

Mitten crabs (Brachyura, Varunidae, Varuninae) are currently classified into six species belonging to three genera: Eriocheir De Haan, 1835, Neoeriocheir T. Sakai, 1983, and Platyeriocheir Ng, Guo & Ng, 1999, i.e., Eriocheir japonica (De Haan, 1835), E. hepuensis Dai, 1991, E. ogasawaraensis Komai, Yamasaki, Kobayashi, Yamamoto & Watanabe, 2006, and E. sinensis H. Milne Edwards, 1853; Neoeriocheir leptognatha (Rathbun, 1913); and Platyeriocheir formosa (Chan, Hung & Yu, 1995). The results of the present study, however, indicate a reclassification into four genera including one new genus, together lodging seven species, including one new species, and with an eighth currently nameless species remaining as a species inquirenda, as follows: Eriocheir De Haan, 1835, with E. japonica (De Haan, 1835) and E. ogasawaraensis Komai et al., 2006; Paraeriocheir gen. nov., with P. hepuensis (Dai, 1991) and P. sinensis (H. Milne Edwards, 1853); Platyeriocheir Ng et al., 1999, with P. formosa (Chan et al., 1995) and P. guangdonga sp. nov.; and Neoeriocheir T. Sakai, 1983, with N. leptognatha (Rathbun, 1913); under the prevailing circumstances, the species now indicated as Eriocheir sp. [= Eriocheir recta sensu Stimpson, 1858] is to be considered a species inquirenda.

In: Crustaceana