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Jaw muscle development as evidence for e ... ning in direct-developing frogs
Jaw muscle development as evidence for embryonic repatterning in direct-developing frogs.
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The Puerto Rican direct-developing frog Eleutherodactylus coqui (Leptodactylidae) displays a novel mode of jaw muscle development for anuran amphibians. Unlike metamorphosing species, several larval-specific features never form in E. coqui; embryonic muscle primordia initially assume an abbreviated, mid-metamorphic configuration that is soon remodelled to form the adult morphology before hatching. Also lacking are both the distinct population of larval myofibres and the conspicuous, larval-to-adult myofibre turnover that are characteristic of muscle development in metamorphosing species. These modifications are part of a comprehensive alteration in embryonic cranial patterning that has accompanied life history evolution in this highly speciose lineage. Embryonic 'repatterning' in Eleutherodactylus may reflect underlying developmental mechanisms that mediate the integrated evolution of complex structures. Such mechanisms may also facilitate, in organisms with a primitively complex life cycle, the evolutionary dissociation of embryonic, larval, and adult features.
Hanken J, Klymkowsky MW, Alley KE, Jennings DH
Proceedings. Biological sciences / The Royal Society
1997-09-22 00:00
264
1386
1349-54
Animals,Anura,Evolution,Larva,Masticatory Muscles,Microscopy, Electron, Scanning,Muscle Development
Department of Environmental, Population, and Organismic Biology, University of Colorado, Boulder 80309-0334, USA jameshankencoloradoedu
Proc. Biol. Sci.
NIGMS GM 54001
0962-8452
10.1098/rspb.1997.0187
625
True
9332017
