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Echinoidea source details
Zachos, L.G. 2012. A new genus and species of echinoid (Echinoidea, Spatangoida) from the Oligocene (Rupelian) of Mississippi. Southeastern Geology, 49/1, 43-48.
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A new genus and species of spatangoid echinoid, Tripatagus pittsi n. gen., n. sp., is described from the Marianna Limestone, Lower Oligocene (Rupelian) of Mississippi. The family is uncertain: plating of the plastron suggests the family Maretiidae; ethmolytic apical system, presence of both peripetalous and subanal fascioles, and depressed petals suggest the family Brissidae or Macropneustidae. It differs from nearly all other genera of these families in the character of 3 gonopores in an ethmolytic apical system, lacking a gonopore in genital plate 2.
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Archaechinus † accepted as Arcaechinus Kier, 1957 † (basis of record)
Tripatagus Zachos, 2012 † (original description) Tripatagus pittsi Zachos, 2012 † (original description) Diagnosis Test small, cordate. Apical system ethmolytic, 3 gonopores, no gonopore in genital plate 2. Anterior ambulacrum ... [details] Etymology Incorporates the prefix tri- with the root –patagus to indicate the 3 gonopores. [details] Etymology The specific name honors the collectors Leslie and Sue Pitts. [details] Taxonomy Placement within the Maretiidae tentative - needs to be confirmed by additional analysis. [details] Type locality HT: Smith County Lime Plant quarry, west of State Highway 18, 3 kilometers southeast of Sylvarena, 31º 59’ 24” ... [details] Type material HT: MMNS IP-4006; PT: MMNS IP-3929, IP103.1, IP103.2, IP-103.3 MMNS = Mississippi Museum of Natural Science [details] |