Title

New Genus of Crab (Brachyura: Raninoida: Necrocarcinidae) from the Upper Cretaceous of West Antarctica, with Description of a New Species

Publication Title

Annals of Carnegie Museum

Publication Date

2012

Document Type

Article

Keywords

Antarctic Peninsula, Decapoda, Gustav Group, Hidden Lake Formation, James Ross Basin, Marambio Group, Santa Marta Formation

Disciplines

Earth Sciences | Geology | Physical Sciences and Mathematics

Abstract

A new genus of crab from the Late Cretaceous of Antarctica increases diversity within Necrocarcinidae Förster, 1968, and demonstrates what appear to be gradual evolution and sympatric speciation in the southern high latitudes. New taxa includeHadrocarcinus tectilacus, new genus, new species, as well astwo new combinations, Hadrocarcinus carinatus (Feldmann et al., 1993) and Hadrocarcinus wrighti (Feldmann et al., 1993).Necrocarcinidae was paleogeographically widespread by the middle Early Cretaceous, but the geographic distribution and diversity of the group increased even further by the middle Late Cretaceous, perhaps as a result of high sea levels and elevated global temperatures at that time. The paleogeographic range and diversity of necrocarcinids decreased during the latest Cretaceous and into the earliest Paleocene (Danian), possibly due to decreases in sea level and global temperatures, restricting the family to the northern high latitudes. Alternatively, apparent diversity trends in Necrocarcinidae may simply reflect available rock volume.