The Echinoid Directory

• Test oval to subpentagonal in outline, flattened in profile with thick rounded margins that are raised aborally around the margins.
• 4 gonopores; apical disc subcentral. Hydropores lie in a groove.
• Petals flush and relatively long; closing distally. Plating with some demiplates.
• Food grooves simple and only developed near peristome.
• Ambulacral zones very much wider than interambulacral zones at ambitus.
• Basicoronal ambulacral and interambulacral plates of similar length, forming pentagon.
• First paired post-basicoronal plates much larger than others.
• Periproct oral, towards posterior margin. Opening bounded by first, second and possibly third pairs of interambulacral plates.

Middle and Upper Eocene of the Caribbean (Jamaica, Cuba, Panama).

Jacksonaster torrei Lambert, in Sanchez Roig, 1926, by original designation.

• C. torrei (Lambert, 1926); Late Eocene, Cuba.
• C. acunai (Lambert, 1926); Middle and Late Eocene, Cuba and Jamaica.

Clypeasteroida; Scutellina; Laganiformes; Laganidae; Neolaganidae.

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Differs from Neolaganum in having a relatively large number of ambulacral and interambulacral plates on the oral surface. Distinguished from Sanchezella by its more circular outline and the fact that its petals are not sunken.

J. W. Durham 1955 Classification of clypeasteroid echinoids. University of California Publications in Geological Sciences 31, 73-198.