First shark from the late devonian (Frasnian) gogo formation, Western Australia sheds new light on the development of tessellated calcified cartilage
Background: Living gnathostomes (jawed vertebrates) comprise two divisions, Chondrichthyes (cartilaginous fishes, including euchondrichthyans with prismatic calcified cartilage, and extinct stem chondrichthyans) and Osteichthyes (bony fishes including tetrapods). Most of the early chondrichthyan ('shark') record is based upon isolated teeth, spines, and scales, with the oldest articulated sharks that exhibit major diagnostic characters of the group - prismatic calcified cartilage and pelvic...[Show more]
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