Jenkins et al.—Four new species of seep-restricted bivalve Caspiconcha Conclusions
Weformally described four new species of seep-restricted genus Caspiconcha from late Albian to early Campanian of Spain, New Zealand, and Japan. The augmented fossil record clearly shows that Caspiconcha reached its highest diversity and broad- est distribution in the Albian, followed by a decrease in diversity, abundance, and geographic range. In the Late Cretaceous, only two species of Caspiconcha are known and are geographically restricted to the western Pacific (New Zealand and Japan). The New Zealand record marks the last abundant occurrence of Caspiconcha, and so far, only one species of Caspiconcha is known to have survived until the Campanian. With the identification of ‘Calyptogena’ sp. of Hikida et al. (2003) as a newspecies of Caspiconcha, the alleged lastCretaceous record of the family Vesicomyidae has been dismissed.
Acknowledgments
We thank two anonymous referees and editors of the journal for their constructive and helpful comments. RGJ thanks Y. Miya- jima (Kyoto University) and K. Sato for helping with fieldwork in Japan; RGJ and AK thank S. Kelly (CASP, University of Cambridge, UK) for access to Greenland Caspiconcha collec- tion in Sedgwick Museum; and SK thanks L. Agirrezabala (Universidad del País Vasco, Spain) and J.S. Crampton (GNS Science, New Zealand) for making the fieldwork in Spain and New Zealand possible and enjoyable, and G. Hundertmark (Göttingen) for photography. The research of RGJ was sup- ported by JSPS KAKENHI Grant Number 26287131, 26400500, and 16H05740 and Grant for Program to Dis- seminate Tenure Tracking System (JST); AK was supported by the research grant no. 2012/07/B/ST10/04189 from National Science Centre, Poland; and SK was supported by the Deutsche Forschungsgemeinschaft through grant Ki802/6-1.
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