Periproct inframarginal in most species; combed areas small; internal supports in an inner ring around lantern as ... [details]
South Australia and Tasmania [details]
Baja California [details]
Miocene to Recent [details]
Early Miocene [details]
Miocene [details]
Small to large, flattened ; margin of test more or less strongly indented at posterior ambulacra, less distinctly ... [details]
HT: UCMP 31712; PT: UCMP 11027 [details]