Exiteloceras

Exiteloceras is an ammonite genus from the Late Cretaceous.[1]

Exiteloceras
Temporal range: Campanian–Maastrichtian[1]
Fossil specimen of Exiteloceras jenneyi
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Suborder:
Ancyloceratina
Superfamily:
Turrilitoidea
Family:
Nostoceratidae
Genus:
Exiteloceras

Hyatt, 1894
Species[2]
  • E. densicostatum
  • E. jenneyi

Exiteloceras was proposed by Alpheus Hyatt in 1894 for heteromorph ammonites with shells that are loosely coiled in a plane, early whorls varying from straight limbs connected by semicircular elbows to elliptical or nearly circular loops, later whorls being elliptical to circular. The whorl section is ovate with the dorsum on the inside curve broader than the venter on the outside. The ribs may be straight or flexuous and mostly slant. Most end with a tubule on the ventrolateral shoulder. The suture is ammonitic. The deeply incised sutural elements are asymmetric, including the double-pronged ventral lobe.

Distribution

Cretaceous of Egypt, Iraq, British Columbia, California, Colorado, Delaware, Montana, New Mexico, Wyoming.[2][3]

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References
Notes
  1. Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
  2. "Paleobiology Database - Exiteloceras". Retrieved 2014-05-28.
  3. Sandy M. S. McLachlan; James W. Haggart (2017). "Reassessment of the late Campanian (Late Cretaceous) heteromorph ammonite fauna from Hornby Island, British Columbia, with implications for the taxonomy of the Diplomoceratidae and Nostoceratidae". Journal of Systematic Palaeontology. Online edition (15): 1247–1299. doi:10.1080/14772019.2017.1381651.
Bibliography
  • A Pictorial Guide to Fossils by Gerard Ramon Case
  • Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.
  • Cobban, William A.,1974. Ammonites from the Navesink Formation at Atlantic Highlands, New Jersey; USGS Prof Paper 845.


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