Abstract The Holocene fossil crab genus Arges De Haan, 1833, is here shown to be a senior subjective synonym of the pilumnid crab Typhlocarcinops Rathbun, 1909. Both genera possess the diagnostic character of an extremely wide first male pleonal somite that reaches across the wide thoracic sternum to the base of the coxae of the fourth pair of ambulatory legs. Arges parallelus (De Haan, 1833), is also here regarded as a senior subjective synonym of Typhlocarcinops decrescens Rathbun, 1904, a species known from Japan, China, Hong Kong, the Philippines and Indonesian Papua.
The name, Galathea keijii, was given to a Miocene fossil species of squat lobster from Japan by Karasawa (1993: 39, pl. 6, figs. 1, 2, 3, 10). In the same year, the name, Galathea keijii, was established for a living species from the Andaman Sea and Arabian Sea (Tirmizi Javed 1993: 50, fig. 22). Therefore, both names are homonymous. The description of Karasawa was published in the Bulletin of the Mizunami Fossil Museum, no. 20, which, on the inside back cover states the date of publication as December 25, 1993. The description of Tirmizi Javed was published in "Indian Ocean galatheids (Crustacea: Anomura)" by the Marine Reference Collection and Resource Centre, University of Karachi. This work was published in 1993 but the day and month of publication were not cited in the publication. In the absence of evidence to the contrary, the date of publication for "Indian Ocean galatheids (Crustacea: Anomura)" is deemed to be the last day of 1993, by application of Article 21.3.2 of the International Code of Zoological Nomenclature (ICZN 1999: 20). As such, application of Article 52 on the principle of homonymy of the International Code of Zoological Nomenclature (ICZN, 1999: 56) shows that Galathea keijii Karasawa, 1993, takes precedence over Galathea keijii Tirmizi Javed, 1993. In accordance with Article 60 on the replacement of junior homonyms (ICZN 1999: 62, 63) a new replacement name, Galathea nasimae, is here proposed for Galathea keijii Tirmizi Javed, 1993. It is dedicated to the late Dr. Nasima M. Tirmizi (Marine Reference Collection and Resource Centre, University of Karachi).
Abstract A large assemblage of small specimens of Tridactylastacus sinensis Feldmann, Schweitzer, and Zhang in Feldmann et al., 2012, from the Middle Triassic (Anisian) Luoping Biota, Yunnan Province, China, permitted cladistic analysis confirming their placement within Litogastridae in the superfamily Glypheoidea. Orientation of 86 specimens closely spaced on a single slab from one bedding surface revealed a preferred orientation suggestive of mild current activity. The specimens were interpreted to have been victims of a mass kill, possibly an algal bloom, within the water column.
Abstract The revised diagnosis and description are given for Cancer (Arges) parallelusDe Haan, 1833, a fossil crab first described from Japan during the 19th century. The neotype of this species from the Holocene (about 9,000–5,000 ybp) Nanyo Formation of Ise Bay, central Japan, is herein designated. The monotypic genus ArgesDe Haan, 1833 belongs to the pilumnid subfamily Rhizopinae Stimpson, 1858 and has close affinities with TyphlocarcinusStimpson, 1858, a genus of Rhizopinae.
All genera previously referred to the Carcineretidae are herein evaluated, and the family is restricted to three genera, Carcineretes, Cancrixantho, and Mascaranada, for which diagnoses are provided. Ophthalmoplax and Longusorbis are herein removed to the Portunidae, and Longusorbis eutychius new species is described from the Eocene Tepetate Formation of Baja California Sur, Mexico, extending the range of that genus across the K/P boundary. The placement of Ophthalmoplax into the Portunidae marks the first confirmed notice of the family in Cretaceous rocks, a major range extension for the family. Important characteristics of the Portunoidea are discussed in the context of placement of fossil taxa within the superfamily and its constituent families.
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