𝔖 Bobbio Scriptorium
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A new evolutionary scenario for the vertebrate jaw

✍ Scribed by Y. Shigetani; F. Sugahara; S. Kuratani

Book ID
101706859
Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
360 KB
Volume
27
Category
Article
ISSN
0265-9247

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✦ Synopsis

The jaw is one of the earliest innovations in vertebrate history. Several recent findings suggest a scenario for jaw evolution as a progression of changes in pharyngeal developmental mechanisms. The lamprey, an extant jawless vertebrate, constitutes a model for the pre-gnathostome ancestry. Comparing expression patterns of regulatory genes between the gnathostome and lamprey embryos may enable us to get a glimpse of the essential changes that were responsible for the evolution of the jaw. We hypothesize that a specific topographical change of inductive tissue interactions to be described here brought about the jaw as an evolutionary novelty.

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Evolutionary innovation in the vertebrat
Evolutionary innovation in the vertebrate jaw: A derived morphology in anuran tadpoles and its possible developmental origin
✍ Mats E. Svensson; Alexander Haas πŸ“‚ Article πŸ“… 2005 πŸ› John Wiley and Sons 🌐 English βš– 246 KB

## Abstract The mouthparts of anuran tadpoles are highly derived compared to those of caecilians or salamanders. The suprarostral cartilages support the tadpole's upper beak; the infrarostral cartilages support the lower beak. Both supra‐ and infrarostral cartilages are absent in other vertebrates.