Abstract
ABSTRACT Nearly 4000 hybodontoid teeth assignable to the typically Mesozoic genera Acrodus and Polyacrodus were recovered by bulk-sampling techniques from the Early Permian Wichita-Albany Group in north-central Texas. They belong to 37 local faunas. Generic assignments are based mainly on crown histology, following the methods of earlier workers. This approach must suffice until the suborder can be revised using a new methodology, yet to be devised. The roots of all the teeth bear specialized foramina on the labial side, parallel to the root-crown contact. The teeth questionably assigned to Acrodus have roots morphologically different from those of Mesozoic species. Hybodus is absent. Tooth morphotypes are assigned to six new species: ?A. olsoni (large teeth with symmetrical crowns; dentition moderately hetero-dont), ?A. sweetlacruzensis (arcuate root-crown contact; roots with deep, closed sulcus; dentition tion homodont), P. zideki (teeth small; crowns uncrenulated, possess longitudinal and transverse oc...
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