Karagandoceras
Karagandoceras is an ammonoid genus belonging to the goniatid family Karagandoceratidae that lived during the early Mississippian (lower Carboniferous).
| Karagandoceras Temporal range: L Mississippian | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Goniatitida |
| Family: | †Karagandoceratidae |
| Genus: | †Karagandoceras Librovitch, 1940 |
Karagandoceras has an involute, lenticular shell, with an acute ventral margin. The ventral lobe of the suture is wide with subparallel to divergent sides, divided by a median saddle with a relatively wide median lobe.
Karagandoceratids, which include Karagandoceras and Mesonoceras are a rare offshoot of the Prionorceratinae that differ from their parent group by possession of an acute ventral margin and an increasingly trifid ventral lobe.
References
- Paleobiology database-Karagandoceras 8/22/10
- Goniat online 8/22/10
- Masonoceras, a new Karaganoceratid Ammonoid from the Lower Mississippian (Lower Osagean) of Kentucky, by David M Work and Walter L Manger. Jour Paleo May 2002; v.76; no. 3; pp 574–577
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