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Abstract:

Snakes are an extremely modified and long-lived clade of lizards that have either lost or highly altered many of the synapomorphies that would clearly link them to their closest sister-group among squamates. We focus here on one postcranial morphological complex, the intercentrum system which in most non-ophidian squamates is limited to the cervical and caudal regions. The Cervical Intercentrum System (CeIS) is composed of a single intercentral element that sometimes articulates with a ventral projection (hypapophyses) of the centrum; the Caudal Intercentrum System (CaIS) is formed by an intercentral element, the haemal arch/chevron bone, and paired ventral projections of the centrum, the haemapophyses. In modern snakes, the intercentrum element of the CeIS is considered lost or fused to the hypaphophysis, and the chevron bone in CaIS is considered lost. Here, we describe new specimens of the early snake Dinilysia patagonica, and reinterpret previously known specimens of Dinilysia and Najash rionegrina, that do not show the expected snake morphology. The anatomy of these fossil taxa unambiguously shows that free cervical and caudal intercentra attached to distinct downgrowths (hypapophyses and haemapophyses) of the centra, are present in basal fossil snakes, and agrees with the proposed loss of post atlas-axis intercentra in later evolving snakes. © 2019, The Author(s).

Registro:

Documento: Artículo
Título:The evolution of the axial skeleton intercentrum system in snakes revealed by new data from the Cretaceous snakes Dinilysia and Najash
Autor:Garberoglio, F.F.; Gómez, R.O.; Simões, T.R.; Caldwell, M.W.; Apesteguía, S.
Filiación:CONICET, Buenos Aires, Argentina
Área de Paleontología, Fundación de Historia Natural Félix de Azara. CEBBAD, Universidad Maimónides. Hidalgo 775 (1405), Buenos Aires, Argentina
IGEBA-Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria (1428), Buenos Aires, Argentina
Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria (1428), Buenos Aires, Argentina
Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada
Palabras clave:anatomy; article; Cretaceous; female; fossil; morphology; nonhuman; skeleton; snake
Año:2019
Volumen:9
Número:1
DOI: http://dx.doi.org/10.1038/s41598-018-36979-9
Título revista:Scientific Reports
Título revista abreviado:Sci. Rep.
ISSN:20452322
Registro:http://digital.bl.fcen.uba.ar/collection/paper/document/paper_20452322_v9_n1_p_Garberoglio

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Citas:

---------- APA ----------
Garberoglio, F.F., Gómez, R.O., Simões, T.R., Caldwell, M.W. & Apesteguía, S. (2019) . The evolution of the axial skeleton intercentrum system in snakes revealed by new data from the Cretaceous snakes Dinilysia and Najash. Scientific Reports, 9(1).
http://dx.doi.org/10.1038/s41598-018-36979-9
---------- CHICAGO ----------
Garberoglio, F.F., Gómez, R.O., Simões, T.R., Caldwell, M.W., Apesteguía, S. "The evolution of the axial skeleton intercentrum system in snakes revealed by new data from the Cretaceous snakes Dinilysia and Najash" . Scientific Reports 9, no. 1 (2019).
http://dx.doi.org/10.1038/s41598-018-36979-9
---------- MLA ----------
Garberoglio, F.F., Gómez, R.O., Simões, T.R., Caldwell, M.W., Apesteguía, S. "The evolution of the axial skeleton intercentrum system in snakes revealed by new data from the Cretaceous snakes Dinilysia and Najash" . Scientific Reports, vol. 9, no. 1, 2019.
http://dx.doi.org/10.1038/s41598-018-36979-9
---------- VANCOUVER ----------
Garberoglio, F.F., Gómez, R.O., Simões, T.R., Caldwell, M.W., Apesteguía, S. The evolution of the axial skeleton intercentrum system in snakes revealed by new data from the Cretaceous snakes Dinilysia and Najash. Sci. Rep. 2019;9(1).
http://dx.doi.org/10.1038/s41598-018-36979-9