Ptycholytoceras is a genus of fast-moving nektonic ammonoid carnivores[2] included in the Lytoceratinae in which the shell has round inner and depressed outer whorls and sides with dorso-ventrally sloping folds that do not pass onto the venter (outer rim).

Ptycholytoceras
Temporal range: Toarcian[1]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Family: Lytoceratidae
Subfamily: Lytoceratinae
Genus: Ptycholytoceras
Spath, 1927
Species

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The type species Phycholyioceras humile (Prinz), named by Spath, 1924, first described as Lytoceras humile by Prinz in 1904, came from the Lower Jurassic (Toarcian)[1] of Hungary.

References

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W.J.Arkell et al., 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L. Geological Society of America and Univ Kansas press.

  1. ^ a b Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
  2. ^ "Paleobiology Database". Retrieved 2014-05-28.