Euhoplites
''Euhoplites'' is an extinct ammonoid cephalopod from the Lower Cretaceous, characterized by strongly ribbed, more or less evolute, compressed to inflated shells with flat or concave ribs, typically with a deep narrow groove running down the middle. In some, ribs seem to zigzag between umbilical tubercles and parallel ventrolateral clavi. In others the ribs are flexuous and curve forward from the umbilical shoulder and lap onto either side of the venter. Fossils of this animal are commonly found in Lower Cretaceous, middle to upper Albian age strata.AMÉDRO, Francis (2013). "Euhoplites Barroisi sp. nov.: Une Nouvelle Ammonite de L'Albien Supérieur de Wissant (Pas-de-Calais, France)." Société Géologique du Nord. Its shell was covered with lumps and bumps. The function of these adornments are unknown, although they may have been a source of hydrodynamic drag, preventing ''Euhoplites'' from swimming at high speeds. Studying them, therefore, may give some insight into the lifes ...
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Hoplitidae
The Hoplitidae is a family of Cretaceous ammonites that lived during the middle of the period from the late Aptian to the Cenomanian. They are part of the superfamily Hoplitoidea. Members of the Hoplitidae are typically evolute, with inner whorls exposed, although some are more involute, and are commonly stout and strongly ribbed, with pronounced tubercles. The Hoplitidae are thought to be derived from the U Aptian -M Albian '' Uligella'' of the Desmoceratidae, or some related form and have been divided into three subfamilies. Subtaxa Classification of Hoplitidae was revised multiple times during last decades. Currently, is contains 3 subfamilies: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. Re