''Hypoxynoticeras'' is an
extinct
Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...
genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
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&nb ...
ammonite
Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ...
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''.
[
]
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
{{ammonitina-stub