Revision of Cyclida (Pancrustacea, Multicrustacea), with five new genera

摘要

All cyclidan species represented by existing material are illustrated photographically. New genera within Cyclidae include Ambocyclus new genus; Carabicyclus new genus; Chernyshevine new genus, Litocyclus new genus; and Tazawacyclus new genus with the following new combinations: A. capidulum (CHERNYSCHEV, 1933); A. simulans (REED, 1908); A.? minutus (ROGERS, 1902); Carabicyclus wrighti (WOODWARD, 1870); L. bilobatus (WOODWARD, 1870); L.? communis (ROGERS, 1902); L. jonesianus (WOODWARD, 1870); L.? permarginatus (ROGERS, 1902); L. torosus (WOODWARD, 1870); Chernyshevine spinosus (CHERNYSCHEV, 1933); T tazawai (NIKO & IBARAKI, 2011); U. harknessi (WOODWARD, 1870); and U. woodwardi (REED, 1893). New genera within Americlidae include Brittaniclus and Dziklus with the following new combinations: B. rankini (WOODWARD, 1868); B. scotti (WOODWARD, 1894); B. testudo (PEACH, 1882); and D. obesus (SCHRAM, VONK & HOF, 1997). A neotype is herein designated for Halicyne plana. Each family within Cyclida occupies a distinct morphospace. Two families survived the end-Permian mass extinction event. Most cyclidans occupied marine conditions, but some are known from marginal marine and freshwater environments.