''Septimaniceras'' is genus of

ammonites Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

that has probably evolved from '' Peronoceras'' and lived during the middle

Toarcian The Toarcian is, in the ICS' geologic timescale, an age and stage in the Early or Lower Jurassic. It spans the time between 182.7 Ma (million years ago) and 174.1 Ma. It follows the Pliensbachian and is followed by the Aalenian. The Toarcian ...

stage of

early Jurassic The Early Jurassic Epoch (geology), Epoch (in chronostratigraphy corresponding to the Lower Jurassic series (stratigraphy), Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic-J ...

. Members of this genus existed from Bifrons Subzone to lower part of Variabilis Subzone. Their fossils were found in France, Hungary and probably also in Austria.KOVÁCS, Z. (2014). Toarcian Dactylioceratidae (Ammonitina) from the Gerecse Mts (Hungary). Hantkeniana, 9, 45-77.

Description

Ammonites belonging to this genus have evolute shells of small size. Inner whorls are cadicone, while outer whorls are subquadrate. On younger whorls, ribs are widely spaced and are of 2 types. Bold ribs have large ventrolateral tubercules, while fine striate ribs exist between them. Later, single and looped ribs with ventrolateral tubercules on later ones are alternating.

References

Dactylioceratidae Toarcian life Early Jurassic ammonites of Europe Ammonitida genera {{Ammonitina-stub