𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Pentadactyl ground state of the avian wing

✍ Scribed by Larsson, Hans C. E. ;Wagner, G�nter P.

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
200 KB
Volume
294
Category
Article
ISSN
0022-104X

No coin nor oath required. For personal study only.

✦ Synopsis

The issue of the homology of bird fingers with those of pentadactyl amniotes has been a topic of contention for nearly 200 years. Data from the fossil record and phylogenetic systematics ascribe bird digit homologies to digits I, II, and III of pentadactyl amniotes while embryological evidence supports digital homologies of II, III, and IV. Using a molecular marker specific for condensation competent mesenchymal cells, we describe a pentadactyl arrangement of prechondrogenic digital anlagen in the wings of stage 29 chick embryos. Only the middle three anlagen develop into mature fingers. This pattern supports the hypothesis that bird fingers develop from digital anlagen II, III, and IV of pentadactylous amniotes. In addition, this result rejects a model assuming a shift in the primary axis in bird digit development and shows that a prechondrogenic digital anlage has been maintained in the bird lineage for at least 220 million years since the last known pentadactylous ancestor of the lineage. Such a vestige suggests that strong constraints are maintaining a pentadactyl ground state in amniotes.

📜 SIMILAR VOLUMES

Pentadactyl pattern of the avian wing au
Pentadactyl pattern of the avian wing autopodium and pyramid reduction hypothesis
✍ KundráT, Martin ;Seichert, Václav ;Russell, Anthony P. ;Smetana, Karel 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 410 KB

We report herein that a pentadactyl developmental pattern is evident in early wing morphogenesis of Gallus (chicken) and Struthio (ostrich). Five avascular zones (spatially predestined locations of contiguous metacarpal and phalangeal aggregation) and four interdigital vascular spaces are establishe

Pentadactyl ground state of the manus of
Pentadactyl ground state of the manus of Alligator mississippiensis and insights into the evolution of digital reduction in Archosauria
✍ Hans C.E. Larsson; Audrey C. Heppleston; Ruth M. Elsey 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 235 KB

## Abstract The three‐fingered state of the avian manus poses intriguing questions about the evolution of digit reduction. Although digit reduction in most tetrapods appears to be the product of straightforward digit loss, avian digit reduction may have occurred with a dissociation of digit positio

The lymphatic endothelium of the avian w
The lymphatic endothelium of the avian wing is of somitic origin
✍ Jörg Wilting; Maria Papoutsi; Martin Schneider; Bodo Christ 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 497 KB 👁 1 views

It has recently been shown that there are lymphangioblasts in the early avian wing bud, but fate map studies on the origin of these cells have not yet been performed. The lymphatics in the wings of 10-day-old chick and quail embryos are characterized by both the position along with all major blood v