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Tiktaalik pectoral fin and mobile wrist

The pectoral fin retains fin rays while its endoskeleton includes a mobile, load-transmitting wrist-like joint and distal elements arranged within the fin.

Represented range375–375 Ma
RegionsFram Formation, southern Ellesmere Island, Nunavut, Canada
CladesTiktaalik roseae · Elpistostegalia

Claim ledger

morphology · high

The Tiktaalik pectoral-fin endoskeleton contains a robust humerus, radius and ulna, wrist-like joints and distal radials capable of transmitting load while retaining lepidotrichial fin rays; it is a fin, not a free-digit limb or a recorded walking trace.

claim:event:tiktaalik-pectoral-fin

References

  1. The pectoral fin of Tiktaalik roseae and the origin of the tetrapod limbShubin, N.H.; Daeschler, E.B.; Jenkins, F.A. Jr · 2006 · DOI 10.1038/nature04637
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