Phillips, G.E., Ciampaglio, C.N. & Hayes, W.E. Jr. (2008). A New Species of Faujasiid Cassiduloid (Echinoidea: Irregularia) from the Santonian-Campanian Boundary (Upper Cretaceous) in the Eastern Gulf States. Southeastern Geology. 46/1: 43-54.

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Phillips, G.E., Ciampaglio, C.N. & Hayes, W.E. Jr.

2008

46/1: 43-54

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In central Alabama, the upper part of the Tombigbee Sand Member, Eutaw Formation (Upper Cretaceous: Gulfian: Santonian), contains the locally common faujasiid cassiduloid Hardouinia bassleri (Twitchell). A closely related, unpublished Hardouinia species occurs at a slightly younger interval in the Tombigbee Sand in northeast Mississippi and in the middle Blufftown Formation of eastern Alabama. Although very similar to H. bassleri with respect to general test morphology, phyllodes, and apical system, Hardouinia saucierae sp. nov. is distinguished by its larger size, more anterior peristome, depressed buccal pores, stouter bourrelets, lower periproct, and more acute ambitus. In Mississippi and eastern Alabama, Hardouinia saucierae occurs at or very near the Santonian-Campanian boundary. The great anatomical similarity between the new species and H. bassleri, coupled with its immediately superjacent stratigraphic occurrence and geographic proximity, suggests the slightly younger H. saucierae may be a contiguous descendant of H. bassleri. These two closely related non-co-occurring species are each accompanied by a second co-occurring species of Hardouinia, the additional species being different in each case depending on certain combinations of unit, age, and location.

Echinoidea

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