Perhaps Tulerpeton had only 5 fingers (and five toes)

Let’s get right to it.
Tulerpeton (Fig. 1) was originally described with six fingers. If not six fingers, where did that sixth finger come from?

The other hand.
Specifically, the tip of finger 4 from the left hand (Fig. 1) provides a suitable match.  The left hand is otherwise buried in the matrix beneath the well-exposed right hand.

Figure 1. Tulerpeton manus with digit 6 re-identified as the top of digit 4 from the other hand.

Figure 1. Tulerpeton manus with digit 6 re-identified as the top of digit 4 from the other hand. The drawing at left is the in situ presentation. The diagram at right is the traditional six-finger interpretation. The manus in the middle represents the new hypothesis of digit identity.

Tulerpeton sisters in the LRT
don’t have a digit 6. So, maybe the original description was a mistake.

Likewise, the pes of Tulerpeton
was also originally described with six digits (Fig. 2). However, a new interpretation first discussed here indicated only five toes were present. That sixth digit was created to fill a perceived space produced by broken and displaced phalanges.

Figure 1. Tulerpeton pes reconstruction options using published images of the in situ fossil.

Figure 2. Tulerpeton pes reconstruction options using published images of the in situ fossil.

References
Coates MI and Ruta M 2001 2002. Fins to limbs: What the fossils say. Evolution & Development 4(5): 390–401.
Lebedev OA 1984. The first find of a Devonian tetrapod in USSR. Doklady Akad. Navk. SSSR. 278: 1407–1413.
Lebedev OA and Clack JA 1993. Upper Devonian tetrapods from Andreyeva, Tula Region, Russia. Paleontology36: 721-734.
Lebedev OA and Coates MI 1995. postcranial skeleton of the Devonian tetrapod Tulerpeton curtum Lebedev. Zoological Journal of the Linnean Society. 114 (3): 307–348.
Mondéjar-Fernandez J, Clément G and Sanchez S 2014. New insights into the scales of the Devonian tetrapods Tulerpeton curtum Lebedeve, 1984. Journal of Vertebrate Paleontology 34:1454-1459.

wiki/Tulerpeton

 

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