Revision of the Early Jurassic arthropod trackways Camurichnus and Hamipes

Abstract

espanolLos icnogeneros Camurichnus y Hamipes han sido revaluados con base en sus especimenes tipo, y sus rangos geograficos y estratigraficos han sido determinados con base en revision de literatura. Las caracteristicas usadas para distinguir Camurichnus (originalmente erigido como Sagittarius) y su icnoespecie incluida alternans, han sido observadas en Bifurculapes laqueatus y por lo tanto, Camurichnus alternans es considerado un sinonimo junior subjetivo de B. laqueatus. Hamipes es un icnogenero distinto, que puede ser diferenciado de icnotaxa similares por el numero, forma y arreglo de las huellas. Huellas del Cretacico que fueron atribuidas a Hamipes, pertenecen a Bifurculapes. Ademas, la icnoespecie H. molassicus se traslada al icnogenero Conopsoides. Dado que el unico registro alternativo de Hamipes era el ejemplar tipo, el icnogenero de nuevo es conocido solo por el Jurasico Temprano de Massachusetts, Estados Unidos. Sin embargo, la reasignacion icnotaxonomica extiende los rangos geografico y estratigrafico de Bifurculapes al Cretacico de Europa. EnglishThe ichnogenera Camurichnus and Hamipes have been reevaluated based on examination of their type specimens, and their geographic and stratigraphic ranges determined based on a review of the literature. The characteristics used to distinguish Camurichnus (originally erected as Sagittarius) and its included ichnospecies alternans, have been observed in Bifurculapes laqueatus and therefore Camurichnus alternans is considered a junior subjective synonym of B. laqueatus herein. Hamipes is a distinct ichnogenus that can be differentiated from similar ichnotaxa by the number, shape, and arrangement of the tracks. Cretaceous trackways from Spain that were attributed to Hamipes belong to Bifurculapes. Additionally, the species H. molassicus is moved to the ichnogenus Conopsoides. Since the only other occurrence of Hamipes was the type specimen, the ichnogenus is again known only from the Early Jurassic of Massachusetts, U.S.A. The ichnotaxonomic reassignment, however, extends the geographic and stratigraphic range of Bifurculapes to the Cretaceous of Europe.