an Entity references as follows:
Yamaguchia toyensis is one of many aquatic oligochaetes belonging to the family Lumbriculidae discovered on the island of HokkaidÅ, Japan, which seems to be one of three "hotspots" of lumbriculid diversity (the others being the Rocky Mountains and Lake Baikal). The genus named after the great oligochaete taxonomist Professor Hideji Yamaguchi.