Resumen de Descriptiion of a new subespecies of Cymatium (Gastropoda, Ranellidae) from the Atlantic Sea

Francisco García-Talavera Casañas, Alejandro de Vera

• español

  Se describe Cymatium (Monoplex) comptum amphiatlanticum n. ssp, para el Oceano Atlantico. Comparandola con especies similares de su grupo taxonomico como C. comptum (Adams, 1855), C. indomelanicum Garcia-Talavera, 1997 y C. vespaceum (Lamarck, 1822), se descubrieron caracteres morfologicos distintivos, pudiendo realizarse una diagnosis diffe- rencial. En principio, C. comptum amphiatlanticum parece ser similar a C. comptum, pero tras un estudio exhaustivo de la concha, se aprecian diferencias bien definidas. Todo ello sugiere que la forma atlantica de C. comptum puede ser considerada, al menos, una nueva subespecie. Pensamos que ambas tuvieron un ancestro comun procedente del Oceano Pacifico.

• English

  Cymatium (Monoplex) comptum amphiatlanticum n. ssp. is described in the present work, from the Atlantic ocean. Comparing it with similar species of its taxonomic group as C. comptum (Adams, 1855), C. indomelanicum Garcia-Talavera, 1997 and C vespaceum (Lamarck, 1822), distinctive morphological characters of the protoconch and teleoconch were revealed. By doing this, a differential diagnosis was possible. In a first approach, C. comptum amphiatlanticum seems to be very close to C. comptum, but conspicuous differ- ences between them are visible after an exhaustive study of the shell. This suggest that the atlantic form of C. comptum can be considered, at least, a new subspecies. We understand that both had a common ancestor from the Pacific ocean.