while E. boloniense is the thickest one. This species lived during upper Albian. E. barroisi These ammonites had moderately evolute whorls, where umbilicus makes 29% of diameter. Whorld section is subhexagonal and biggest thickness is at the level of umbilical tubercules. Umbilical wall is rounded and flanks are slightly convex. Lautiform ribs begins at spiny umbilical tubercules and are tending strongly forward. They are joining at the strongly developed ventro-lateral clavi, which are pinched obliquely to siphonal line and are alternating on both sides. Some other ribs are zigzagging from umblical tubercules to ventro-lateral clavi. On the venter, there is deep concave groove. This is very well visible difference from its predecessor, E. lautus which had siphonal channel. Very similar is E. loricatus, shich also has only ventral groove and is missing siphonal channel. Difference is, that in the case of E. loricatus, ventro-lateral clavi are not oblique to siphonal line, while they are oblique to it in the case of E. barroisi. Important difference is also in stratigraphy, as E. loricatus is middle albian species, while E. barroisi lived during upper Albian zone of Dipoloceras cristatum. There is a gap between their occurrence during the zone of Dimorphoplites biplicatus ammonite zone, during which, the only member of this genus was E. lautus. Evolution Euhoplites has evolved during Lower Albian from Hoplites (Hoplites) canavarii. Among early species belonging to this genus were Euhoplites loricatus, E. aspasia, or E. meandrinus. These early species were added to genus Proeuhoplites, but this genus is by some authors considered to be synonym of Euhoplites. Later species have evolved channelled venter by which they differ from these early species. To these later species belongs for example Euhoplites truncatus, E. lautus, or E. elenae. In the Upper Albian, during Hysteroceras varicosum zone, Euhoplites inornatus has evolved. This differs greatly from contemporaneous members of this genus by not having channelled venter and it looked much more similar to genus Anahoplites. For this species a monotypic genus Euhoplitoides was proposed, but it is also considered to be just a synonym of Euhoplites. Latest members of this genus gave rise to genus Hyphoplites (Discohoplites). References Treatise on Invertebrate Paleontology, Part L, Mollusca 4, 1957. Geological Soc. of America and Univ. Kansas Press. External links for pictures of Euhoplites: Gault ammonites Les Euhoplites Hoplitidae Ammonitida genera Early Cretaceous ammonites Ammonites of Europe Albian life Albian genus extinctions