On the phylogenetic relationships of Russian carditids Ainicardita and Lunulicardita (Bivalvia: Carditidae)

PEREZ, DAMIÁN EDUARDO

Oxford

Congreso; 64th Palaeontological Association Annual Meeting; 2020

The Palaeontological Association

Two genera of Carditidae were erected by Popov to group carditids from the east of Russia: Ainicardita and Lunulicardita. The former has an elongated elliptical outline with low umbones and strong cardinal teeth. In contrast, the latter has a high outline with strongly recurved umbones and enlarged cardinal teeth. Both taxa include large and massive shells. These genera were not considered in recently proposed systematics classifications of the family and herein are included for the first time. A cladistic phylogenetic analysis of the family is carried out with more than one species of each genus and the obtained placements are discussed. Ainicardita is a monophyletic taxon included within Venericorini as a sister clade of (Megacardita+Bathycardita). Lunulicardita is placed as sister taxon of the enigmatic living genus Strophocardia, and both are included within the clade Cyclocardida. Lunulicardita and Strophocardia genera were synonymized in the past and could represent a unique lineage. Also, a relationship between the clades Venericorini and Cyclocardida are obtained.