Tonicia, GRAY, 1847

GENUS TONICIA GRAY, 1847 View in CoL

Type species: Chiton ‘ elegans ’ Frembly, 1827 [non de Blainville, 1825], by subsequent designation Gray (1847: 168) = Tonicia ‘ elegans ’ ( Frembly, 1827).

Diagnosis: Animal oval to elongate oval, girdle leathery, clothed with multiple spicules. Tegmentum smooth, covered by irregularly arranged macro- and microaesthetes; radial ridges of ocelli pores on head valve in the contact between central and lateral areas of intermediate valve and in postmucronal area of tail valves. Tail valve flattened, mucro subcentral, not prominent; anterior and posterior slopes practically straight. Slit formula 8–9/1/8–12, slits deep. Teeth strongly grooved on outside and directed outwards in head and tail valves.