Model of Jimbacrinus bostocki.
Image: Jon Augier
Source: Museum Victoria
Fossil of Jimbacrinus bostocki.
Image: Jon Augier
Source: Museum Victoria
Jimbacrinus had five arms which were lined with fine tentacle-like structures called pinnules. Like all crinoids, it used these unfurled arms to feed on small animals and particles in the water.
Fossils of Jimbacrinus show that they were abundant seafloor animals in what is now Western Australia during the Permian.