Hypoxynoticeras

Hypoxynoticeras
Temporal range: Pliensbachian[1]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Family: †Oxynoticeratidae
Genus: †Hypoxynoticeras
Spath, 1925
Type species
Ammonites sphenonotus
Monke, 1888
Species
  • Hypoxynoticeras sphenonotum Monke, 1888

Hypoxynoticeras is an extinct genus of lower Jurassic ammonite that lived during Jamesoni zone of lower Pliensbachian. Animals belonging to this genus had small platycone shells, of which umbilicus made 25—30% of diameter. Keel was strong and ventrolateral shoulders were prominent. It is possible, that it was just a microconch, or juvenile of Radstockiceras.[1]

  1. ^ a b M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.