A summary of reports of abyssal and hadal Monoplacophora and Polyplacophora (Mollusca) * Author Schwabe, Enrico text Zootaxa 2008 1866 205 222 journal article 10.5281/zenodo.183815 7ce45df8-da22-4d29-810c-33564fb50f16 1175­5326 183815 Leptochiton pergranatus Dall, 1889 Leptochiton pergranatus Dall 1889a : 414 . Dall (1889b) mentioned the occurrence of this species between the Gulf of Mexico and Dominica at depths between 208 and 2160 m .