Vermiceras

Vermiceras is an ancient sea creature called an ammonite that belongs to the group known as Ammonitida. This amazing creature lived millions of years ago during the Early Jurassic period.

The shell of Vermiceras is special. It spirals outward in a pattern called "evolute" and has many long, straight lines or ribs that run along its surface. These ribs do not branch out but stay in one direction. The shell is not very wide, and as it grows, the loops or "whorls" add up quickly, making many turns.

One clear feature of Vermiceras is a sharp ridge that runs along the bottom part of its shell, called a "ventral keel." Scientists have measured the size of this ammonite and found that its shell was about 5.2 centimeters or 2 inches in diameter. This helps us understand how big these creatures were when they swam in the ancient oceans.

Subgenera and species

Here are some names of different kinds of Vermiceras:

• V. (=Metophioceras) galaczi
• V. (=Metophioceras) rotarium
• V. (=Metophioceras) rotticus
• V. (=Metophioceras) trigonatum
• V. (=Protocymbites) azzouzi
• V. densicostatum

And some more types:

• V. (Gyrophioceras)

  • V. (G.) mineralense
  • V. (G.) morganense
  • V. (G.) praespiratissimum
  • V. (G.) supraspiratum

• V. (Paracaloceras)

  • V. (P.) concavum
  • V. (P.) coregonense
  • V. (P.) multicostatum
  • V. (P.) rursicostatum
  • V. (P.) varaense