20.2" Full Dorsal Dimetrodon Vertebra - Spine Sail 20thcentury This two-strand

This two-strand

Gainesville: University Press of Florida

" ~ Seymour Cray

59" fossil root from the genus Lepidodendron which was recovered from a coal bed in Kentucky

suggesting an evolution from mako sharks rather than megatoothed sharks

20.2" Full Dorsal Dimetrodon Vertebra - Spine Sail 20thcentury This two-strandONE OF A KIND PERMIAN MATERIAL! With a fearsome jaw and reptilian appearance, Dimetrodon is often mistaken for a dinosaur. However, this family of Early Permian Age species falls into a disparate taxonomic clade known as synapsids which includes mammals. This specimen is a one of a kind, 20. 2", full dorsal Dimetrodon fossil vertebra. The purpose of the spine sail is unknown, though speculation ranges from thermoregulation to sexual dimorphism, and