''Acanthohoplites'' is an extinct genus of

ammonites 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 cuttl ...

in the

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

Parahoplitidae that lived in the Aptian and Early Albian stages of the Early Cretaceous.

Taxonomy

The taxonomic position in the ''

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ...

'' Pt L, 1957 placed the genus into the family Deshayesitidae. Newer classifications have revised that placement and the genus is now included into the family Parahoplitidae. '' Parahoplites'' and '' Hypacanthoplites'' are similar genera.

Description

These ammonites have a strongly ribbed shell and ammonitic suture. Early whorls are coronate, which later become round, then oval in section. Primary ribs may have swellings (bullae) at the umbilicus or are without. In early stages primary ribs branch mid flank at prominent lateral tubercles. In later stages lateral tubercles are reduced or absent and primary ribs branch simply at the umbilical shoulder or, again, mid flank. Sutural elements are subquadrate with narrow, shallow embayments. The first lateral lobe tends to be symmetrical.

Species

The following species have been described, either as ''Acanthoplites'' or ''Acanthohoplites''.''Acanthohoplites''
at Fossilworks.org * ''A. abichi'' * ''A. aschiltaensis'' * ''A. belohasifakaensis'' * ''A. berkleyi'' * ''A. bigoureti'' * ''A. erraticus'' * ''A. hannoverensis'' * ''A. hesper'' * ''A. impetrabilis'' * ''A. interiectus''Gómez & Salgado, 2017, p.17 * ''A. manerensis'' * ''A. midoensis'' * ''A. mitiensis'' * ''A. paucicostatus'' * ''A. schucherti'' * ''A. soaranensis'' * ''A. teres'' * ''A. trifurcatus'' * ''A. venustus'' The species ''A. nolani'' was described as '' Hoplites nolani'' and later designated the

type species In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specime ...

of the genus '' Nolaniceras'' in 1961, and was subsequently renamed as ''Nolaniceras nolani''.

Distribution

''Acanthohoplites'' has been found in Upper Aptian and Lower Albian sediments in Europe, Central Asia, East Africa, North and South America: * Río Mayer Formation,

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* Lowell Formation,

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* Paja Formation, Barichara, Colombia * Grès verts helvétiques Formation,

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* Clansayes and La Peña Formations,

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* Lemgo Formation,

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* Maputo Formation,

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* Hokodz River Basin,

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* Makatini Formation,

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* Lower Greensand Formation,

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* Morocoto River,

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Taxonomy

Description

Species

Distribution

References

Bibliography

Further reading