Hypoxynoticeras

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]

Hypoxynoticeras
Temporal range: Pliensbachian[1]
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Superfamily:
Psiloceratoidea
Family:
Oxynoticeratidae
Genus:
Hypoxynoticeras

Spath, 1925
Type species
Ammonites sphenonotus Monke, 1888
Species
  • H. sphenonotum Monke, 1888

Distribution

Fossils belonging to this genus were found in northern Germany, Poland, western Scotland and in England.[1][2]

Sources
  1. M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
  2. Pieńkowski, G. (2014). The first Early Jurassic ammonite find in central Poland. Volumina Jurassica, 12(1), 99-104.


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