Hanleya Gray, 1857

Sirenko, Boris, 2014, Composition of the genus Hanleya (Mollusca: Polyplacophora: Lepidopleurida), with the description of two new species, Journal of Natural History 48 (45 - 48), pp. 2913-2945 : 2916-2917

Genus Hanleya Gray, 1857

Type species Hanleya debilis Gray, 1857 (= Chiton hanleyi Bean in Thorpe, 1844), by monotypy.

Stratigraphic range

Upper Oligocene – Recent.

Distribution

Atlantic Ocean and adjacent seas, from southern Greenland and the western Barents Sea (74.27° N) to the Brazilian coast (25.44° S), including the Mediterranean Sea, and the Gulf of Mexico. Bathymetric range extends from the intertidal zone ( H. hanleyi ) to 1680 m ( H. nagelfar ).

Diagnosis

The following diagnosis for the genus Hanleya is based on data from Sirenko (1997), Jardim and Simone (2010b), and new data in this publication.

Animal small to large. Insertion plate of head valve well developed, a primordium of insertion plates present in intermediate valves in all species. Insertion plates of tail valve well developed in Hanleya harasewychi sp. nov. and H. brachyplax , developed to a variable extent in H. hanleyi , H. nagelfar and H. mediterranea sp. nov., entirely absent in H. tropicalis . Tegmentum with large roundish or oval granules, each granule with one megalaesthete surrounded by 8–16 micraesthetes. Girdle covered with spicules or scales and longer, randomly dispersed needles or spines. Heads of major lateral teeth of radula with tridentate cusp, central denticle largest.