A new species of Calliostoma (Gastropoda: Calliostomatidae) from Weizhou Island, South China Sea

摘要

This paper describes and illustrates Calliostoma spesa new species, sampled from the intertidal zone in coarse sandy bottom in Weizhou Island, the South China Sea. The new species is characterized by its conical shell with dense spiral cords which are composed by strings of strong beads. We describe the shell characters in detail and compare it with the similar species Calliostoma basulense Poppe, Tagaro and Vilvens, 2014. Mitochondrial 16S rRNA and nuclear 28S rRNA genes of the new species are sequenced. Phylogenetic trees constructed using Bayesian inference (BI) and maximum likelihood (ML) analyses incorporating available Calliostoma sequences from GenBank, confirm the generic assignment of this taxon to a new species.