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 morphologyedit
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.
Referencesedit
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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frechites, early, triassic, ammonite, kind, cephalopod, with, external, shell, included, ceratitid, family, beyrichitidae, temporal, range, early, triassic, scientific, classification, kingdom, animalia, phylum, mollusca, class, cephalopoda, subclass, ammonoid. Frechites is an early Triassic ammonite a kind of cephalopod with an external shell included in the ceratitid family Beyrichitidae FrechitesTemporal range early Triassic Scientific classification Kingdom Animalia Phylum Mollusca Class Cephalopoda Subclass Ammonoidea Order Ceratitida Family Beyrichitidae Genus FrechitesSmith 1932Taxonomic revision editJ 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 editThe 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 References editFrechites 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 nbsp This Ceratitida related article is a stub You can help Wikipedia by expanding it vte nbsp This Svalbard related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Frechites amp oldid 1083368207, wikipedia, wiki, book, books, library,
