0.8" Captorhinus Aguti Fossil Femur Bone Permian Age Reptile 299 Mil Yrs Old Display COA

Location: Admiral Formation, Lawton, Oklahoma

Weight: 0.5 Ounces

Dimensions: 0.8 Inches Long, 0.2 Inches Wide, 0.2 Inches Thick

Comes with a free Gem Jar display. 

Comes with a Certificate of Authenticity.

The item pictured is the one you will receive. 

Captorhinus aguti represents an early reptilian taxon from Permian-age deposits in North America and is considered a key example of primitive amniote evolution. The genus was relatively small, with a total body length of approximately 30 cm and a skull length of around 7 cm. Limb proportions and body structure suggest a terrestrial lifestyle, with morphology broadly comparable to modern small reptiles.

Captorhinus belonged to the captorhinomorphs, a basal reptile clade distinguished by an anapsid skull condition, characterized by the absence of temporal openings for jaw musculature. This cranial configuration indicates an early stage of reptilian functional anatomy before the evolution of more advanced synapsid and diapsid skull structures. As reptile evolution progressed, groups with enhanced jaw mechanics and more efficient feeding strategies became dominant.

The eventual decline of captorhinomorphs and their replacement by more derived reptilian lineages illustrates a major transition in Paleozoic terrestrial ecosystems. Captorhinus, therefore, provides an important reference point for studying early reptile diversity and evolutionary experimentation.