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Conostichoceras : ウィキペディア英語版 | Conostichoceras
''Conostichoceras'' is an exogastric, breviconic oncocerid included in the family Nothoceratidae, known from the Middle Devonian of central Europe and Upper Devonian of Australia.〔Sweet, W.C. 1964. Nautiloidea-Oncocerida Treatise on Invertebrate Paleontology part K.〕 It probably lived on and swum above the sea floor.〔(''Conostichoceras'' ). The Paleobiology Database.〕 ==Morphology== ''Conostichoceras'', named by Foeste, 1926, produced a depressed exogastric breviconic shell with short, wide chambers and large living chamber, similar to ''Blakeoceras'' and ''Turnoceras'' but differing details especially of the siphuncle. The siphuncle is ventral; nummuloidal in the adapical half of the phragmocone but with concave profiles in the adoral half, and is actinosiphonate. The sides of the living chamber in the adult converge slightly on the aperture.〔
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