Mucrodactylites

Mucrodactylites, which is sometimes considered to be a synonym of Collina,^[2] is genus of ammonite that lived during middle to late Toarcian stage (Bifrons Subzone to lower Variabilis ammonite Zone) of early Jurassic. Their fossils were found in Europe, northern Africa and South America. Species belonging to this genus were probably microconchs of Catacoeloceras. As macroconch of M. mucronatus is considered to be Catacoeloceras raquinianum.^[1]

Mucrodactylites Temporal range: Toarcian PreꞒ Ꞓ O S D C P T J K Pg N [1]
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Dactylioceratidae
Subfamily:	†Dactylioceratinae
Genus:	†Mucrodactylites Buckman, 1927
Type species
Ammonites mucronatus d'Orbigny, 1845
Species
M. mucronatus d'Orbigny, 1845 M. sorguensis Monestier, 1931 M. freboldi Monestier, 1931 M. clapierensis Guex, 1972 M. marioni Lissajous, 1906 M. orientalis (Dagis, 1968) M. contiguum (Dagis, 1968) M. aveyronensis n. sp.(=M. gracile sensu Monestier & Guex)

Description

Ammonites belonging to this genus have small, evolute and compressed shells with suboval to subquadrate whorl section. Primary ribs are strong, simple and bifurcating. Secondary ribs are projected.^[1]