Revision of Amydrocarcinus and Palaeograpsus (Decapoda: Brachyura: Xanthoidea) with definition of three new genera

概要

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All species referred to Palaeograpsus Bittner, 1875, have been reevaluated, resulting in three new genera, Bittneria, Magyarcarcinus, and Litograpsus. Amydrocarcinus Schweitzer et al., 2002, and Magyarcarcinus new genus are placed within the Goneplacinae MacLeay, 1838, of the Goneplacidae MacLeay, 1838, and constitute some of the earliest occurrences of the family. Bittneria new genus, Carinocarcinus Lorenthey, 1898, and Palaeograpsus sensu stricto are placed within the Eucratopsinae Stimpson, 1871, of the Panopeidae Ortmann, 1893, and document the first notice of the subfamily in the fossil record. The Pseudorhombilidae Alcock, 1900, and the Eucratopsinae are very difficult to differentiate from one another based upon dorsal carapace characters typically preserved in the fossil record, but the ratios of the frontal width and fronto-orbital width are shown to be useful for this purpose. Litograpsus new genus is placed within the Grapsidae MacLeay, 1838, sensu lato. Palaeograpsus guerini Via, 1959, is placed within Chasmocarcinus Rathbun, 1898. The Panopeidae displayed a Tethyan distribution pattern early in its history, and the Pseudorhombilidae has been largely restricted to the Americas since its first occurrence in the Miocene of Argentina (Glaessner, 1933).
日本古生物学会の論文
2004-04-30