Extreme lower jaw elongation in a placoderm reflects high disparity and modularity in early vertebrate evolution
Melina Jobbins,
Martin Rücklin,
Marcelo R. Sánchez Villagra
et al.
Abstract:Jaws are a key vertebrate feature that arose early in our evolution. Placoderms are among the first jawed vertebrates; their fossils yield essential knowledge about the early diversification of gnathostome feeding strategies, diets and modularity. Modularity can be expressed through disproportional lengths of lower and upper jaws as in swordfish or halfbeaks.
Alienacanthus malkowskii
is an arthrodire from the Famennian of Morocco and Poland, whose most remarkable feature is its lower ja… Show more
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