Chiton (Chiton) granosus Frembly 1827

Chile Central

Animal of large size, up to 45 mm in examined specimens. Intermediate valves often eroded and rather flat. Anterior valve convex, post-mucronal slope straight. Mucro moderately blunt; centrally located on posterior valve. Jugal tract smooth, central areas with somewhat beaded longitudinal ribs. Lateral triangle barely raised; low, broad, nodular rib extends along diagonal line. Often a few other radiating rows of nodules appear on lateral triangle. Terminal areas with 10–12 radiating rows of widely spaced nodules. Color of tegmentum nearly totally dark brown to greenish brown, with occasional streaks of cream white on jugal and central areas. Girdle black. Interior of valves white with dull blue muscle scars and reddish brown on posterior slope of callus (After Bullock 1988). According to Osorio (2002) this species is gonochoric, like almost all other chiton species that have been studied. It can reach a maximum length of 80 mm.

Marincovich (1973) gives the northernmost distribution for this species at Paita (05°05’34”S; 81°06’07”W), Peru. Osorio et al. (2005) records the southernmost record of this species at Boca del Guafo (43°39’S; 74°00’W), Region of Aysén, southern Chile.