|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Echinoidea - Cassiduloida
It was recombined as Cossmannaster hemisphaericus by Sanchez Roig (1926); it was recombined as Clarkiella hemispherica by Cooke (1953).
|Year||Name and author|
|1909||Cassidulus hemisphericus Slocum pp. 7-8 figs. pl. 1, figs. 7, 9|
|1915||Cassidulus conoideus Clark|
|1915||Cassidulus conoideus Clark and Twitchell p. 80 figs. Plate XXVII, Figs. 3a-d|
|1915||Cassidulus hemisphericus Clark and Twitchell p. 80|
|1926||Cossmannaster hemisphaericus Sanchez Roig p. 73|
|1953||Clarkiella hemispherica Cooke p. 18 figs. Pl 5, figs 15-18|
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.