Hematitida
Jump to navigation
Jump to search
| Hematitida Temporal range:
| |
|---|---|
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| Subclass: | |
| (unranked): | |
| Order: | †Hematitida Doguzhaeva et al., 2002[1]
|
| Family and genera | |
|
Hematitidae
| |
Hematitida is a group of coleoid cephalopods known from the early Carboniferous Period. They are the oldest definite coleoids,[2] although there are controversial claims for even older coleoids from the Devonian.[3] Fossil hematitidans have so far been found only in Arkansas and Utah of the United States.[2] The only family described so far is Hematitidae.
Characteristics
[edit | edit source]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[1]
Classification
[edit | edit source]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
[edit | edit source]- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
Lua error in Module:Taxonbar at line 165: attempt to index field 'wikibase' (a nil value).