Amaltheus

Amaltheus
Temporal range: Pliensbachian[1]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Family: †Amaltheidae
Genus: †Amaltheus
de Montfort, 1808
Subgenera

see text

Amaltheus is an oxyconic ammonite with a fairly open umbilicus, serrated keel, and slightly sigmoidal ribs from the Lower Jurassic, many of which are strigate. Amaltheus, named by de Montfort, 1808, is indicative of the upper Pliensbachian stage in Europe, north Africa, Caucasus, Siberia, N. Alaska, Canada, Oregon, and possibly Honduras; and is the type for the Amaltheidae and a member of the Eoderoceratoidea.[2]

Two subgenera are recognized. One, A.(Amaltheus) is already described. The other A. (Pseudoamaltheus), sometimes expressed as genus, is a late derivative of (Amaltheus) with an early loss of keel and ribbing and an extreme development of strigation.

References

Notes
  1. ^ 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.
  2. ^ "Paleobiology Database - Amaltheus". Retrieved 2017-10-19.
Bibliography
  • Arkell et al., 1957. Mesozoic Ammonoidea. Treatise in Invertebrate Paleontology, Part L; Geological Society of America and University Kansas press.
  • Donovan, Collomon,& Howarth. Classification of the Jurassic Ammonitina, in The Ammonoidea, M.R. House and J.R. Senior (eds) Academic Press 1981. Systematics Association Special Volume. 18. [1]


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