Английская Википедия:Hematitida
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Hematitida is a group of coleoid cephalopods known from the early Carboniferous Period. They are the oldest definite coleoids,[1] although there are controversial claims for even older coleoids from the Devonian.[2] Fossil hematitidans have so far been found only in Arkansas and Utah of the United States.[1] The only family described so far is Hematitidae.
Characteristics
Some features shared by hematitidans include
- a short rostrum, made of aragonite and organic material, and bearing ridges
- a short living chamber, only 1.5 to 2 times the length of the last chamber of the phragmocone
- a spherical protoconch
- a narrow, straight phragmocone
- a multi-layered conotheca - the outer wall of the phragmocone
- a narrow, ventral siphuncle[3]
Classification
The classification for this group comes from Doguzhaeva et al. 2003[4]
Order Hematitida Doguzhaeva, Mapes, & Mutvei, 2002
- Family Hematitidae Gustomesov 1976
- Hematites Flower & Gordon 1959 - type genus
- Bactritimimus Flower & Gordon, 1959
- Paleoconus Flower & Gordon, 1959
References
- ↑ 1,0 1,1 Ошибка цитирования Неверный тег
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; для сносокNishiguchi2008
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; для сносокBandel1983
не указан текст - ↑ Ошибка цитирования Неверный тег
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; для сносокDoguzhaeva2002
не указан текст - ↑ Ошибка цитирования Неверный тег
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; для сносокDoguzhaeva2003
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