Abbasites
| Abbasites Temporal range: early Middle Jurassic | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Erycitidae |
| Subfamily: | †Erycitinae |
| Genus: | †Abbasites Buckman, 1921 |
| Species | |
| |
Abbasites is an extinct ammonite genus from the early Middle Jurassic included in the ammonitid family Erycitidae.
Description
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 [1]
Classification
Abbasites was originally described by Sydney S. Buckman in 1921,[1][2] 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 Stephanocerataceae, according to Westermann (1965)[3][4] and Imlay (1984)[3] but was previously placed in the Hildoceratacean family Hammatoceratidae by Arkell et al. (1957).[1] It is currently regarded as a full genus in the Erycitidae subfamily Erycitinae.[5][6] 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.[7]
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;[8] originally thought to be closely related to A. abbas, but following subsequent study has been removed from Abbasites to the genus Opuatia[8]
References
- 1 2 3 Arkell,Kummel, and Wright 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L, Mollusca 4
- ↑ Abbasites in Nomenclator Zoologicus
- 1 2 Imlay, Ralph W . 1984. Early and Middle Bajocian (Middle Jurassic) Ammonites from Southern Alaska; U.S.G.S PP 1322
- ↑ 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.
- ↑ Dietze, V.; et al. (2010). "Rare Middle Jurassic ammonites of the families Erycitidae, Otoitidae and Stephanoceratidae from southern Germany" (PDF). Zitteliana. 50: 71–88.
- ↑ Parsons C. F.2008 A Systematic Revision of the Bajocian Ammonite Subfamily Sphaeroceratinae, pages 1–90 Unpublished thesis.
- 1 2 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