The genus Cyamiocardium Soot-Ryen, 1951 (Bivalvia: Cyamiidae) in sub-Antarctic and Antarctic waters

URCOLA, MATÍAS R.; ZELAYA, DIEGO G.

POLAR BIOLOGY

SPRINGER

Año: 2018 vol. 41 p. 1157 - 1164

0722-4060

For more than 50 years the genus Cyamiocardium was regarded as represented bythree species: Cyamiocardium denticulatum (with Cyamiocardium rotundatum asa synonym), Cyamiocardium dahli, and Cyamiocardium crassilabrum. However,in the last years, the latter was removed from Cyamiocardium, alternatively beingplaced into Perrierina. All these species were mainly based on the general shellmorphology of a reduced number of specimens, with scarce (or no) informationon their anatomy and reproductive traits. The present study provides the firstsystematic revision of the species of Cyamiocardium occurring in sub-Antarcticand Antarctic waters. For that, an extant source of material was available; andseveral characters not studied (in detail) before, such as prodissoconchmorphology and microsculpture, gross anatomy, and reproductive characteristics,were investigated. As part of this study, the identity of C. denticulatum (the type species of the genus) and that of C. dahli are clarified. In addition, C. rotundatum is revalidated as a full species, and C. crassilabrum is transferred again to Cyamiocardium. Furthermore, three new species were detected and are described herein: Cyamiocardium chuanisinense new species, Cyamiocardium namuncurense new species, and Cyamiocardium yeskumaala new species. The new information arising from this study is used to redefine the genus Cyamiocardium, and to re-analyze the similarities/differences of this genus with other cyamiids.