Karagandocerataceae
| Karagandocerataceae Temporal range: Early Carboniferous | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Ammonoidea |
| Order: | Goniatitida |
| Superfamily: | Karagandocerataceae Librovich 1957 |
Karagandocerataceae, Karagandoceratoidea in recent classifications, is an Early Carboniferous (Mississippian) superfamily within the ammonoid order, Goniatitida, said to contain the Karagandoceratidae and Prodromitidae.[1][2]
Analysis
Shells are discoidal to lenticular. Adult stages are oxygonic, having acute venters, or have distinct keels.[1] The ventral lobe may be either bifurcate or trifurcate (two or three pronged) and there is a tendency to increase the number of elements ontogenetically in the suture.
Taxonomic Affinities
In the most recent classifications, W.M. Furnish, et al., 2009 [3] and GONIAT[1] the Karagandocerataceae, referred to as Karaganoceratoidea, is divided into the Karagandoceratidae and Prodromitidae, with Karagandoceras, Bartzschiceras and Masonoceras included in the Karagandocertidae.
Previously,Deiter Korn (2006)[4] included Karagandoceras along with Bartzschiceras and Masonoceras in the subfamily Karagandoceratinae which he included in the Prionoceratidae as part of the Prionocerataceae. Note retention of the—aceae ending. The Prodromitidae is included in the same superfamily.
Members of the Karagandoceratidae are probably derived from different members of the Prioceratidae and therefore is an artificial grouping. The Prodromitidae, with which it is included, has been placed in the Prolecanitidain other classifications.[5]
References
- 1 2 3 taxonomy GONIAT-online
- ↑ Paleobiology Database- Karagandoceratoidea
- ↑ Classification of W.M Furnish et al, 2009
- ↑ Classification of D. Korn 2006
- ↑ Miller, Furnish, and Schindewolf 1957. Paleozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L. Geological Society of America and Univ of Kansas Press