Subangulata

Subangulata is a genus of extinct ammonites, a type of ancient cephalopod that lived during the Early Jurassic period.

The name Subangulata comes from the Latin words "sub" meaning "under" and "angulata" meaning "angled" or "zigzag", which refers to the shape of the genus's shell. These ammonites were characterized by their compressed, swirled shell shape, with a suture pattern that featured a distinctive zigzag or wavy shape.

Subangulata fossils are found in geological strata from the Early Hettangian age, around 200 million years ago. These fossils are typically found in areas such as Southern England, France, and Tunisia, where the early Jurassic sedimentary rocks have been well-exposed through erosion.

Subangulata is considered a transitional genus between the more primitive Early Jurassic ammonites and the more advanced ones that followed. The genus's strongly swirled shell and wavy suture lines suggest a transition from the earlier, more primitive sculptured suture forms to the more complex and articulated sutures of the later ammonites.

Despite its relatively simple appearance, the Subangulata genus demonstrates an intriguing example of the evolutionary history of the ammonites during the Early Jurassic period. The Subangulata fossils provide valuable information about the lives of these ancient cephalopods and the ecosystems they inhabited, shedding light on the fascinating story of life on Earth during that time.