''Hypoxynoticeras'' is an
extinct genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...
of
lower Jurassic
The Early Jurassic Epoch (in chronostratigraphy corresponding to the Lower Jurassic Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic-Jurassic extinction event, 201.3 Ma&nbs ...
ammonite
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttle ...
that lived during Jamesoni zone of
lower Pliensbachian. Animals belonging to this genus had small platycone shells, of which
umbilicus
Umbilicus may refer to:
*The navel or belly button
*Umbilicus (mollusc), a feature of gastropod, Nautilus and Ammonite shell anatomy
* ''Umbilicus'' (plant), a genus of over ninety species of perennial flowering plants
*Umbilicus urbis Romae
The ...
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''.
[
]
Distribution
Fossils belonging to this genus were found in northern Germany, Poland, western Scotland and in England.[Pieńkowski, G. (2014). The first Early Jurassic ammonite find in central Poland. Volumina Jurassica, 12(1), 99-104.]
References
Oxynoticeratidae
Ammonitida genera
Jurassic ammonites of Europe
Pliensbachian life
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