Flabellisphinctes

Flabellisphinctes
Temporal range:
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Family: †Perisphinctidae
Genus: †Flabellisphinctes
Mangold & Elmi, 1966

Flabellisphinctes is small, evolute genus of perisphinctid ammonite. Its fossils are known from the upper Middle Jurassic (Callovian), which occurred between 160 and 154 million years ago.

Flabellisphinctes is included in the subfamily Grossouviinae which is part of the Perisphinctidae. The shell is around 5 cm (abt. 2in) in diameter, with closely spaced radial ribs on the inner whorls. Outer whorls with ribs are more widely spaced, coming off the umbilical shoulder and flattening about mid flank, and dividing near the ventrolateral shoulder into well-defined ribs that cross the venter with a kink mid-way. Whorl cross-section is suboval and compressed, with a narrowly arched rim.

References

  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 2008-05-07. Retrieved 2017-10-18.
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