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During the Late Jurassic
The siphuncle is the tube between the septum walls that allows the shell to be filled with gas or water
Features skeletal structure and internal organs
called a hyponome
Taung Child Skull reconstruction
Psychopyge elegans, trilobite (Replica) Stegosaurus During the Late JurassicIn addition to its many spines this very unusual trilobite also has a large spine or appendage on the front of the head. This specimen is from the Hamar Laghdad Formation, Alnif region, Morocco. Trilobites are very well known, and possibly the second most famous fossil group after the dinosaurs with some 15,000 known species. Trilobites are extinct arthropods that form the class Trilobita. They appeared at the start of the Cambrian period and
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