Jaw myogenesis in the monk parakeet: evidence of developmental reprogramming in the emergence of novel muscles in Psittaciformes (Aves)
| Autor: | Jorge Rafael Ronderos, Claudia Patricia Tambussi, Maria Cecilia Chiale, Julieta Carril |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
0301 basic medicine HETEROTIPY MORPHOLOGICAL NOVELTIES Otras Ciencias Biológicas Zoology 010603 evolutionary biology 01 natural sciences Ciencias Biológicas 03 medical and health sciences Basal (phylogenetics) EVO-DEVO Species Specificity biology.animal medicine Animals Monachus biology First pharyngeal arch Masseter Muscle Myogenesis Parakeets Parakeet Anatomy biology.organism_classification Biological Evolution 030104 developmental biology medicine.anatomical_structure Jaw Myiopsitta HETEROCHRONY Animal Science and Zoology Psittaciformes Heterochrony CIENCIAS NATURALES Y EXACTAS MYIOPSITTA MONACHUS |
| Popis: | Psittaciformes have apomorphies in the muscles of the jaw that include both the adductors m. ethmomandibularis (EM) and m. pseudomasseter (PM) which are equally responsible for the generation of strong bite forces. While the EM is present in all Psittaciformes, the PM can be absent or present, and even under-developed or well-developed. The aim of this study is to identify developmental reprogramming processes by comparing the myogenesis of the jaw of the monk parakeet Myiopsitta monachus with the information available about other species of Psittaciformes. Seventeen specimens including embryos at different developmental stages, and nestlings of different ages were studied through the analysis of serial histological sections. At embryonic stage 24 (S24) the muscle precursor was observed in the first pharyngeal arch. At S27 the muscle precursor was found to be divided into lateral, intermediate and medial portions. At S31 the independent development of the EM as a rostro-dorsal projection of the mm. pterygoidei could be observed. At S36 the individualization of all muscles was complete. Finally, the PM was detected two days after hatching as an aponeurotic dorsal projection of the m. adductor mandibulae externus superficialis, located lateral to the arcus jugalis. Our results suggest that in M. monachus the muscles EM and PM emerge as a result of a process of heterotipy, and variations in the degree of development of the PM are associated to a heterochronic process of post-displacement, with M. monachus having an underdeveloped PM with respect to basal Psittaciformes. Fil: Carril, Julieta. Universidad Nacional de la Plata. Facultad de Ciencias Naturales y Museo. Cátedra de Histología y Embriología Animal; Argentina Fil: Ronderos, Jorge Rafael. Universidad Nacional de la Plata. Facultad de Ciencias Naturales y Museo. Cátedra de Histología y Embriología Animal; Argentina Fil: Tambussi, Claudia Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina Fil: Chiale, Maria Cecilia. Universidad Nacional de la Plata. Facultad de Ciencias Naturales y Museo. División Zoología de Vertebrados. Sección Ornitología; Argentina |
| Databáze: | OpenAIRE |
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