''Hemihoplites'' is an extinct genus of ammonoid cephalopods belonging to the family Hemihoplitidae. with and (1996), ''Mollusca 4 Revised , Cretaceous Ammonoidea'', vol. 4, in ''Treatise on Invertebrate Paleontology'', Part L (Roger L. Kaesler et el. eds.), Boulder, Colorado: The Geological Society of America & Lawrence, Kansas: University of Kansas Press, pp. 228, 231. These fast-moving

nekton Nekton or necton (from the ) is any aquatic organism that can actively and persistently propel itself through a water column (i.e. swimming) without touching the bottom. Nektons generally have powerful tails and appendages (e.g. fins, pleopods, ...

carnivore A carnivore , or meat-eater (Latin, ''caro'', genitive ''carnis'', meaning meat or "flesh" and ''vorare'' meaning "to devour"), is an animal or plant Plants are the eukaryotes that form the Kingdom (biology), kingdom Plantae; they ar ...

s lived in the

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...

period, from the

Hauterivian The Hauterivian is, in the geologic timescale, an age in the Early Cretaceous Epoch or a stage in the Lower Cretaceous Series. It spans the time between 132.6 ± 2 Ma and 125.77 (million years ago). The Hauterivian is preceded by the Valangi ...

age to the

Barremian The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 125.77 Ma (million years ago) and 121.4 ± 1.0 Ma (Historically, this stage was placed at 129.4 million to approximately 125 million years ago) It is a ...

age.Sepkoski, Jac
Sepkoski's Online Genus Database – Cephalopoda
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Description

It is evolute, compressed. The Whorl section is rectangular. The ribs are simple or branching or long or short, well spaced, straight or slightly flexuous, crossing flat venter transversely, typically with distinct umbilical and ventrolateral tubercles.

Species

* ''Hemihoplites feraudianus'' (d'Orbigny, 1841) * ''Hemihoplites mexicanus'' Imlay, 1940 * ''Hemihoplites ploszkiewiczi'' Riccardi and Aguirre Urreta, 1989 * ''Hemihoplites soulieri'' (Matheron, 1878) * ''Hemihoplites varicostatus'' Riccardi and Aguirre Urreta, 1989

Distribution

Fossils of species within this genus have been found in the

rocks of Antarctida (

Alexander Island Alexander Island, which is also known as Alexander I Island, Alexander I Land, Alexander Land, Alexander I Archipelago, and Zemlja Alexandra I, is the largest island of Antarctica. It lies in the Bellingshausen Sea west of Palmer Land, Antarcti ...

), Bulgaria, southeastern France, Mexico, Slovakia, South Africa and Trinidad and Tobago.

References

External links

* * Cretaceous ammonites Ammonites of Europe Ammonitida genera Ancyloceratoidea Cretaceous France Fossils of France Fossils of Antarctica Ammonites of North America {{Ammonitida-stub