''Orthildaites'' is a genus of ammonites that lived during the lower Toarcian stage of early Jurassic, during Falciferum subzone.

Description

Shell of these ammonites had quadrate whorl section with broad venter and strong keel in the center. Almost straight ribs were curving slightly forward at ventrolateral edge. Coiling has been evolute. It has evolved form genus ''

Hildaites Hildoceratinae is an extinct subfamily of cephalopods belonging to the family Hildoceratidae. Ammonites of this subfamily had shells with elliptical or quadrate whorl section with keel or tricarinate, bisulcate venter. Ribs were variable, from fa ...

'' and gave rise to ''

Hildoceras ''Hildoceras'' is a genus of ammonite from the Jurassic period in the family Hildoceratidae. The shells are characterized by a narrow discoidal evolute shape, keeled venter, concave ribs along the outer flanks, and a shallow spiral groove r ...

'' from which it differs in morphology by broader whorls and straight ribs.

Remarks

''Orthildaites'' fossils were found in Europe and north Africa.M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea. Only one (or two) species is known in the Toarcian NW European domain, its diversity is higher in the Mediterranean faunal province. Validity of ''O. orthus'' is debated, as sometimes it is considered to be valid, while other authors consider it to be a synonym of ''O. douvillei''.HOWARTH, Michael K. The ammonite family Hildoceratidae in the Lower Jurassic of Britain. Monograph of the Palaeontographical Society, 1992, 145.586: 1-106.

References

Ammonitida genera Hildoceratidae Toarcian life Early Jurassic ammonites of Europe Ammonites of Africa Ammonite genera {{Ammonitina-stub