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REVISION OF AMMONITES CONRADI MORTON 1834, AND THE CONCEPT OF DISCOSCAPHITES MEEK 1870

Restudy of Morton's (1834) Ammonites conradi from the Prairie Bluff Chalk, on which species Meek (1870) based the subgenus Discoscaphites, shows it to include small to medium-sized scaphites with ventrolateral, umbilical and 2 to 6 flank rows of nodes on the body chamber and varying portions of the phragmocone. Nodes of the species are characteristically subequal in size. In addition to marked sexual dimorphism, Discoscaphites conradi exhibits a range of variation from compressed, high-whorled conchs with subdued ornament to stout, subquadrate conchs with coarse ornament; the subspecies D. conradi conradi and Morton's D. conradi gulosus respectively include these two relatively more abundant end-member groups. Stephenson's (1941) Discoscaphites roanensis from the Kemp Clay of Texas becomes a synonym of D. conradi. In describing scaphites from the Western Interior, Meek (1876) enlarged the scope of Discoscaphites to include multinodose forms differing significantly from Morton's conradi, as well as forms lacking any flank nodes whatsoever. Only Meek's (1876) Scaphites (Discoscaphites) conradi var. gulosus can be included in Discoscaphites as emended in this paper. By this redefinition the range of the genus is limited to the Maestrichtian. The Eurasian genus Hoploscaphites Nowak 1911, which has been frequently confused with Dis- coscaphites owing to Meek's broad concept of the latter genus is clearly distinct from it in completely lacking flank nodes in either the type Hoploscaphites constrictus (Sowerby) or related species.