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Oligopygus Haldemani
Oligopygus was an Eocene sea urchin has a medium-sized test and is found throughout the south-eastern part of North America, the Caribbean, the West Indies, and Central America.
Identifiable features[]
- Test of medium size, elongate to subcircular in outline; margin and adoral surface rounded, sunken towards peristome
- Apical system subcentral, monobasal, with four gonopores. Sexual dimorphism in size of genital pores (larger in females)
- Petals well developed, open distally, anterior petal III longest, posterior pair (V & I) shortest. Pores strongly conjugate, equal number of pores in pores series in the same petal. Ambulacra beyond petals composed of primary plates, demiplates, and in some species included plates; demiplates and included plates small, thin, not reaching interior of test, absent near peristome
- Peristome subcentral, opening subpentagonal to subtrigonal, in deep transverse depression or trough
- Periproct inframarginal, midway between peristome and posterior margin
- Buccal pores present on edge of peristome
- Tubercles small, irregularly arranged both adorally and adapically
Species and locations[]
- O. costuliformis Jeannet, 1928; Late Eocene, Trinidad
- O. curasavica Molengraaff, 1929; Upper Eocene, Curacao
- O. haldemani (Conrad, 1850); Late Eocene, Florida
- O. jamaicensis Arnold & Clark, 1927; Middle Eocene, Jamaica
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Oligopygus Sea Urchin
- O. kugleri Jeannet, 1928; Late Eocene, Trinidad
- O. nancei Cooke, 1941; Late Eocene, Venezuela
- O. phelani Kier, 1967; Late Eocene, Florida, USA
- O. pinguis Palmer in Sanchez Roig, 1949: Middle-Late Eocene, Cuba
- O. putnami Israelsky; 1933; Upper Eocene, Mexico
- O. rotundus Cooke, 1942; Late Eocene, Alabama, USA
- O. sanchezi Lambert, 1932; Middle Eocene, Cuba
- O. wetherbyi de Loriol, 1888; Late Eocene, Florida, USA
- O. zyndeli Jeannet, 1928; Late Eocene, Trinidad