Frechites

Frechites is an early Triassic ammonite, a kind of cephalopod with an external shell, included in the ceratitid family Beyrichitidae.

Frechites
Temporal range: early Triassic
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ceratitida
Family:
Beyrichitidae
Genus:
Frechites

Smith, 1932

Taxonomic revision

J.P. Smith, 1932, put Frechites in the Ceratididae where it remained included in the Treatise Part L. It was later removed to the Beyrichitidae, established by Spath, 1934.

Comparative morphology

The shell of Frechites is robust, involute, and strongly ribbed. The outer whorl embraces most of the inner, leaving a small umbilicus. Short, strong ribs appear along the umbilical shoulder that split in twos and threes in the middle of the sides, which continue to the outer, or ventrolateral, shoulder but do not cross the venter, or outer rim, which is left smooth.

The suture of Frechites is partly ammonitic, with a slightly serrate first lateral saddle. The other saddles in the suture are rounded and smooth. As such this is intermediate between common Ceratitidae with entirely ceratite sutures -smooth saddles, serrate lobes, and the normal Beyrichideae with sutures that tend to be ammonitic or subammonitid, with deep serrated lobes and high serrated saddles.

gollark: Fascinating.
gollark: No. Also, it uses chatboxes or something, I don't think we have those.
gollark: Although you'd then need central coordination, you would probably want central coordination anyway.
gollark: I would have separate drones running each part of the route.
gollark: That doesn't tell you how much they use *per second* or anything *when flying*.

References
  • Frechites -Paleobio
  • Treatise on Invertebrate Paleontology, Part L, 1957. Geological Society of America and University Kansas Press.
  • J.P. Smith, 1932. Lower Triassic Ammonoids of North America. U.S. Geological Survey Professional Paper 167.


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