part of part of pectoral girdle bone pectoral girdle skeleton dermal bone ventral cleithrum According to Forey 1988, History of the Coelacanth fish: 'In placoderms there are large overlapping plates which completely encircle the body and superficially may be matched with those in osteichthyans (Stensio, 1959; Forey, 1980; Jarvik, 1980). Thus, the anterior median ventral, anteroventral and anterior lateral of placoderms lie in the same positions as the interclavicle, clavicle (ventral cleithrum) and cleithrum (dorsal cleithrum) of osteichthyans.' UBERON:4300015 Wasila M Dahdul