†Sismondia javana ladronensis Nisiyama 1968 (sand dollar)
Echinoidea - Clypeasteroida - Laganidae
Full reference: S. Nisiyama. 1968. The echinoid fauna from Japan and adjacent regions, Part II. Paalaeontological Society of Japan Special Papers 13:1-480
Belongs to Sismondia javana according to S. Nisiyama 1968
Sister taxa: none
Type specimen: IGPS 73737
Ecology: slow-moving semi-infaunal detritivore
Distribution: there are no occurrences of Sismondia javana ladronensis in the database