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Journal of Paleontology

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MEXFUSUS ROTUNDICOSTATUS, A NEW GENUS AND SPECIES OF NEOGASTROPOD FROM THE LATE CRETACEOUS OF SOUTHERN MEXICO

¹ Department of Geology, University of California at Davis, One Shields Avenue 95616, <vermeij{at}geology.ucdavis.edu>, <herbert{at}geology.ucdavis.edu>
² Instituto de Geologia, Ciudad Universitaria, Coyoacan, México D. F. 04510, México, <vegver{at}servidor.unam.mx>, <mariacp{at}servidor.unam.mx>

Mexfusus rotundicostatus new genus and species is a neogastropod of uncertain affinities from the Late Cretaceous (Early Maastrichtian) Mexcala Formation of southern Mexico. It is characterized by strong, rounded, axial ribs, fine spinelets at the intersection of axial ribs and sharp spiral cords, subsutural cord, strong simple spiral cords, and an apparently smooth, glazed columellar lip. A possible second species is Peristernia conica Riedel, 1932 from the Coniacian of Cameroon.