Taxonomic Revision of the Superspecific Groups of the Cretaceous and Cenozoic Tellinidae |
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acutely rounded adductor muscle scar antero-dorsal margin Arcopagia Beaks bluntly truncate broadly arcuate broadly rounded cardinal is small coalescent with pallial concentric ridges Conrad Cossmann Cretaceous depressed ligamental groove DESCRIPTION Deshayes dorsal margin Dorsal view elongate-ovate end is rounded end of ligamental entirely coalescent Eocene Exterior of left Exterior of right figs FIGURED SPECIMEN fold is obsolete genus GEOLOGIC RANGE Gmelin HABITAT Hanley height Hinge plate holotype inequilateral Interior Iredale Lamarck laterals of left left anterior cardinals left posterior cardinals left valve length Linearia Linnaeus lunule Macoma margin is broadly margin is coalescent mid-length millimeters moderately oblique Olsson Omala Pallial sinus posterior and left posterior end postero-dorsal margin postero-umbonal fold Quadrans radial striae right posterior right valve Römer Sculpture consists Shell of medium Shell small sinus is large Sowerby species Strigilla subequilateral Subgenus suborbicular Tellinidae thickness thin trigonal Type TYPE-SPECIES USNM valve are obsolete valves are absent ventral margin