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Aturia
''Aturia'' is an extinct genus of Paleocene to Miocene nautilids within Aturiidae, a monotypic family, established by Campman in 1857 for ''Aturia'' Bronn, 1838, and is included in the superfamily Nautilaceae in Kümmel 1964.
''Aturia'' is characterized by a smooth, highly involute, discoidal shell with a complex suture and subdorsal siphuncle. The shell of ''Aturia'' is rounded ventrally and flattened laterally; the dorsum is deeply inpressed. The suture, one of the most complex in the Nautiloidea, has a broad flattened ventral saddle, narrow pointed lateral lobes, broad rounded lateral saddles, broad lobes on the dorso-umbilical slopes, and a broad dorsal saddle divided by a deep, narrow median lobe. The siphuncle is moderate in size and located subdorsally in the adapical dorsal flexture of the septum. ''Aturia'' most likely preyed upon small fish and crustaceans in the open waters of the prehistoric times.
''Aturia'' is likely derived from species of the genus ''Aturoidea'' of the family Hercoglossidae. Fossils of ''Aturia'' species are fairly cosmopolitan, being found from Paleogene-aged to Miocene-aged marine strata throughout the world: after the Miocene, the various species disappear from the fossil record. In contrast to Nautilidae, ''Aturia'' has no modern descendants.
==See also==
*List of nautiloids
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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