hapettimia

Hapettimia is a genus of extinct sea urchins that lived during the Cretaceous period. Fossil remains of Hapettimia have been found in what is now Wyoming, USA, and northeastern Queensland, Australia.

The genus was first described by the paleontologist Charles W. Erben in 1973. Erben recognized Hapettimia as a distinct genus on the basis of its unique morphology, particularly the shape and size of its teeth.

Hapettimia urchins were characterized by their relatively small size, typically measuring between 3 and 6 centimeters in diameter. They had a rounded, symmetrical body, with a flat, disc-shaped upper surface and a more pointed, conical lower surface.

The teeth of Hapettimia urchins were long and slender, with a distinctive hooked apex. They were attached to the lower surface of the urchin's body and were likely used for capturing and eating small prey, such as plankton and alga.

Several species of Hapettimia have been identified, including Hapettimia quadrii and Hapettimia evansi. The genus is thought to have evolved during the mid-Cretaceous period, around 100-90 million years ago.

Hapettimia urchins likely played an important role in the marine ecosystems in which they lived, serving as both predators and prey. Their fossil remains can provide valuable insights into the evolution and diversity of ancient sea urchin populations.

The classification and distribution of Hapettimia species continue to be the subject of ongoing research and study. Further analysis of its fossil remains will likely yield new information about the biology and ecology of these extinct sea urchins.