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Harpagofututor volsellorhinus New Genus and Species (Chondrichthyes, Chondrenchelyiformes) from the Namurian Bear Gulch Limestone, Chondrenchelys problematica Traquair (Visean), and Their Sexual Dimorphism

Richard Lund
Journal of Paleontology
Vol. 56, No. 4 (Jul., 1982), pp. 938-958
Stable URL: http://www.jstor.org/stable/1304712
Page Count: 21
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Harpagofututor volsellorhinus New Genus and Species (Chondrichthyes, Chondrenchelyiformes) from the Namurian Bear Gulch Limestone, Chondrenchelys problematica Traquair (Visean), and Their Sexual Dimorphism
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Abstract

A new chondrenchelyoid bradyodont, Harpagofututor volsellorhinus is described from the Namurian Bear Gulch limestone beds, Bear Gulch member of the Heath Formation, of Montana. It has a bladelike body form with a low, continuous dorsal fin, segmental vertebral arcualia, and a biserial archipterygial pectoral fin, as does Chondrenchelys problematica. There are two paired flat upper tooth plates, and a symphysial plus two paired crushing lower tooth plates. Males have large paired, distally biramous ethmoid claspers. In C. problematica, the anterior set of the two paired upper plates is sharp edged, shearing past the sharp median and two anterior paired lower plates. The posterior pair of both upper and lower plates is durophagous. Male Chondrenchelys have hypertrophied pectoral fins, while females have slightly built fins. Pelvic fins of females of both species are reduced. The Carboniferous tooth plate genera Platyxystrodus and Solenodus are tentatively assigned to this order.

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