... , 1936 ) presented a classification dividing edrioasteroids into five families: Stromatocystitidae, Hemicystitidae, Agelacrinitidae, Edrioasteridae, and Cyathocystidae, and this classification was followed by Regnéll, ( 1966 ). Kesling ( 1967 ) added Pyrgocystidae to this scheme...

... as reported by Sprinkle and Parsley (1982) . Order Edrioasterida Bell, 1976 Family Edrioasteridae Bather, 1898 Genus Edrioaster Billings, 1858 Edrioaster priscus ( Miller and Gurley, 1894 ) Figures 3 , 4   Figure 3 —Photographs of specimens of Edrioaster priscus...

... the paleoecology of the Chisholm Shale setting from which their specimens were collected, as well as the evolutionary implications that Totiglobus might have for the rest of the Class Edrioasteroidea. Their description of the morphology of Totiglobus , a member of the Order Edrioasterida, is based on 48 type...

.... Edrioasterida (Middle Cambrian through Middle Ordovician) is characterized by extremely wide ambulacra with externally exposed, biserial flooring plates, thick tessellate interambulacral plates, and a large globular theca. Isorophida (Middle Cambrian through Late Permian) is characterized, in post-Cambrian taxa...

... with pentaradiate ambulacra in a 2-1-2 pattern. Bell ( 1976 ) subdivided them into two major groups, the Isorophida, which have uniserial ambulacral flooring plates, and the Edrioasterida, which have biserial alternating ambulacral flooring plates. Bell ( 1976 , fig. 2, p. 25) showed that edrioasterid flooring...