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Re: The nearbird
David Marjanovic wrote:
> The first
> toe is preserved lying medial to metatarsal II.
As Xu et al. put it, "As preserved, pedal digit I lies medial to metatarsal II,
suggesting a non-reversed hallux." It does seem unlikely that _Anchiornis_ had
a perching pes. However, alone the preserved position of the hallux doesn't
impact a great deal on whether the hallux (first toe) was reversed or not. As
pointed out by Middleton (2001), it's the morphology of metatarsal I that
counts (plus the articulation on the rest of the foot).
This was recently reinforced by Hutchinson & Allen in their Naturwissenshaften
paper: "A caudal position of the fossa for metatarsal I and a longitudinal
twisting of the metatarsal I shaft are the two best indices of hallucal
retroversion â preserved position is not reliable as it is too subject to
Middleton KM (2001). The morphological basis of hallucal orientation
in extant birds. J. Morphol. 250: 51â60.
Hutchinson JR and Allen V (2008). The evolutionary continuum of limb function
from early theropods to birds. Naturwissenshaften DOI 10.1007/s00114-008-0488-3
- The nearbird
- From: David Marjanovic <email@example.com>