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 | |
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Genus: | Hypoxynoticeras Spath, 1925 |
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Ammonites sphenonotus Monke, 1888 | |
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Distribution
Fossils belonging to this genus were found in northern Germany, Poland, western Scotland and in England.[1][2]
Sources
- M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
- Pieńkowski, G. (2014). The first Early Jurassic ammonite find in central Poland. Volumina Jurassica, 12(1), 99-104.
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