''Notidanodon'' is an extinct
genus of
cow shark. Fossils ascribed to this genus are known from the
Jurassic,
Cretaceous, and
Paleogene
The Paleogene ( ; British English, also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period, geologic period and system that spans 43 million years from the end of the Cretaceous Period million yea ...
periods. The genus is known from every continent including Antarctica.
Species
The earliest occurrences of attributed specimens are from the
Tithonian
In the geological timescale, the Tithonian is the latest age of the Late Jurassic Epoch and the uppermost stage of the Upper Jurassic Series. It spans the time between 152.1 ± 4 Ma and 145.0 ± 4 Ma (million years ago). It is preceded by the K ...
of New Zealand, and the latest are from the
Thanetian of Europe, Asia, and North America. Currently, four
Mesozoic species and two
Cenozoic
The Cenozoic ( ; ) is Earth's current geological era, representing the last 66million years of Earth's history. It is characterised by the dominance of mammals, birds and flowering plants, a cooling and drying climate, and the current configura ...
species are attributed to the genus, but the long temporal range and wide range of variation may mean this genus is
paraphyletic
In taxonomy (general), taxonomy, a group is paraphyletic if it consists of the group's most recent common ancestor, last common ancestor and most of its descendants, excluding a few Monophyly, monophyletic subgroups. The group is said to be pa ...
. Due to this, revisions may be required in the near future.
Mesozoic species
* ''N. dentatus''
* ''N. lanceolatus''
* ''N. antarcti''
Cenozoic species
* ''N. brotzeni''
* ''N. loozi''
References
{{Taxonbar, from=Q26972743
Prehistoric shark genera
Hexanchidae