Hoplites (ammonite)

Hoplites is a genus of ammonite that lived from the Early Albian to the beginning of the Middle Albian.[2] Its fossils have been found in Europe, Transcaspia and Mexico. Shell has compressed, rectangular till depressed and trapezoidal whorl section. There are strong umbilical bullae from which, prominent ribs are branching and these are interrupted on venter. Ends of ribs on the venter are prominent and can be both alternate or opposite. Some species have zigzaging ribs and these ribs ends usually thickened, or they can be raised into ventrolateral tubercules. These tubercules are mostly oblique clavi.[1]

Hoplites
Temporal range: Albian[1]
Douvilleiceras mammilatum and Hoplites dentatus
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Suborder:
Ammonitina
Superfamily:
Hoplitoidea
Family:
Hoplitidae
Subfamily:
Hoplitinae
Genus:
Hoplites

Neumayr, 1875
Type species
Ammonites dentatus (Sowerby, 1821)
Subgenera
  • H. (Hoplites) Neumayr, 1875
  • H. (Isohoplites) Casey, 1954
Synonyms
  • Amedroites Cooper & Owen, 2011
  • Daghestanites Glazunova, 1953
  • Lautihoplites Baraboshkin, 1996
  • Odonthoplites Breistroffer, 1947

Evolution

Subgenus H. (Isohoplites) has evolved in Early Albian from Otohoplites normanniae that gave rise to H. (I.) steinmanni, which is the only member of subgenus Isohoplites. From this, subgenus Hoplites has evolved and gave subsequently rise to Anahoplites (from H. (H.) dentatus) and Euhoplites (from H. (H.) canavarii).[2]

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References
  1. Wright, C. W. (1996). Treatise on Invertebrate Paleontology, Part L, Mollusca 4: Cretaceous Ammonoidea (with contributions by JH Calloman (sic) and MK Howarth). Geological Survey of America and University of Kansas, Boulder, Colorado, and Lawrence, Kansas, 362.
  2. Amédro, F., Matrion, B., Magniez-Jannin, F., & Touch, R. (2014). La limite Albien inférieur-Albien moyen dans l’Albien type de l’Aube (France): ammonites, foraminifères, séquences. Revue de Paléobiologie, 33(1), 159-279.


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