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Rudists from Resolution and Allison guyots (Mid-Pacific Mountains), recovered during Leg 143 of the Ocean Drilling Program (ODP), are recorded from Barremian to Albian strata. Taxa present belong to the families Requieniidae, Monopleuridae, and Caprinidae. Radiolitidae are noticeably absent. The Barremian interval yielded only one determinable monopleurid mdist, Petalodontia. This occurrence is compatible with its known range in Europe and establishes a circum-global Tethyan distribution for this form. Early Aptian strata produced a rich and diverse fauna of primitive caprinids, corresponding in their evolutionary development to species known from Europe and America from beds of this age. A new species of Caprina, a closely related form, also probably from that genus, and a form of unknown genus are described. All these taxa have right valves with simple, rectangular canals developed mainly on the dorsal and anterior margins. Although there is some relationship between our forms and European and American caprinids endemism exists at the generic and specific levels. The Albian interval also yielded several types of caprinids, but of larger size and having systems of pallial canals different from those of the Aptian. Of particular interest is the occurrence of "Caprina" cf. mulleri, which was previously described by Hamilton (1956) from Cape Johnson Guyot, also in the Mid-Pacific Mountains. This distinctive form may be an indicator of a Pacific Province, or endemic center. A genus related to the coalcomanid genus Caprinuloidea, an American endemic, was also found at this level. This demonstrates some relationship between the Pacific and Caribbean regions at this time.

Early Cretaceous Rudist Fauna of Allison and Resolution Guyots, Mid-Pacific Mountains