Abbasites
| Abbasites Temporal range:
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Erycitidae |
| Subfamily: | †Erycitinae |
| Genus: | †Abbasites Buckman, 1921 |
| Species | |
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Abbasites is an extinct genus of ammonites from the early Middle Jurassic epoch, included in the ammonitid family Erycitidae.[2]
Description
[edit]Abbasites is small and subglobular with ribbing that divides high on its sides and which has an interruption on the venter that replaces the keel, generally characteristic of the Hammatoceratidae [3]
Classification
[edit]Abbasites was originally described by Sydney S. Buckman in 1921,[3][4] with A. abbas as its type species, and was considered by some to be a subgenus of Erycites. Abbasites was included in the Otoitidae, the ancestral family of the Stephanoceratoidea, according to Westermann (1965)[5][6] and Imlay (1984)[5] but was previously placed in the Hildoceratoid family Hammatoceratidae by Arkell et al. (1957).[3] It is currently regarded as a full genus in the Erycitidae subfamily Erycitinae.[7][8] The genus Erycites is believed to be ancestral to Abbasites. However, Abbasites is believed to have left its own descendants in the ammonite family Otoitidae.[9]
Valid species:
- Abbasites abbas, found in southern Spain.
- A. platystomus, found in southern Alaska.
- A. sparsicostatus (described by Ralph Imlay)
Dubious and excluded species:
- ?Abbasites cestiferus; type specimen too small to be certain about classification.
- (Abbasites) challinori;[10] originally thought to be closely related to A. abbas, but following subsequent study has been removed from Abbasites to the genus Opuatia[10]
References
[edit]- ^ Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Archived from the original on 2016-02-25. Retrieved 2017-10-18.
- ^ "Paleobiology Database - Abbasites". Retrieved 2017-10-19.
- ^ a b c Arkell, Kummel, and Wright 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L, Mollusca 4
- ^ Abbasites in Nomenclator Zoologicus
- ^ a b Imlay, Ralph W . 1984. Early and Middle Bajocian (Middle Jurassic) Ammonites from Southern Alaska; U.S.G.S PP 1322 [1]
- ^ Westernamm,G. E. G. 1965.Septal and Sutural Patterns in Evolution and Taxonomy of Thamboceratidae and Clydoniceratidae (M Jurassic Ammonitina).Journal of Paleontology 39(5)864-874, Sept
- ^ Kovács, Z.; Géczy, B. (2008). "Upper Toarcian – Middle Aalenian (Jurassic) Erycitinae SPATH (Ammonitina) from the Gerecse Mts, Hungary" (PDF). 125th Anniversary of the Department of Palaeontology at Budapest University – A Jubilee Volume Hantkeniana. 6: 57–108. Archived from the original (PDF) on 2011-07-16.
- ^ Dietze, V. (2010). "Rare Middle Jurassic ammonites of the families Erycitidae, Otoitidae and Stephanoceratidae from southern Germany" (PDF). Zitteliana. 50: 71–88. Archived from the original (PDF) on 2011-07-16.
- ^ Parsons C. F.2008 A Systematic Revision of the Bajocian Ammonite Subfamily Sphaeroceratinae, pages 1–90 Unpublished thesis.
- ^ a b Westernamm et al. Bajocian (Middle Jurassic) Ammonitina of New Zealand. New Zealand Journal of Geology and Geophysics, vol43, issue 1 pp 33–57; The Royal Society of New Zealand