Three-dimensional analysis of the titanosaurian limb skeletonimplications for systematic analysis
- Adrián Páramo 1
- Pedro Mocho 2
- Francisco Ortega 1
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1
Universidad Nacional de Educación a Distancia
info
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2
Universidade de Lisboa
info
ISSN: 1886-7995, 1698-6180
Año de publicación: 2020
Título del ejemplar: Dinosaurs and other Biota: from Bones to Environments
Volumen: 46
Número: 4
Páginas: 369-402
Tipo: Artículo
Otras publicaciones en: Journal of iberian geology: an international publication of earth sciences
Resumen
El esqueleto apendicular de los titanosaurios presenta similitudes morfológicas entre clados muy diversos y su información osteológica es de menor utilidad para taxonomía respecto a otras regiones del esqueleto. Es possible que se produzca una convergencia morfológica debido a similitudes morfofuncionales entre miembros de los diferentes grupos de titanosaurios. Además, la elevada variabilidad intraespecífica ha dificultado la diferenciación entre formas de titanosaurio morfológicamente similares en el Cretácico tardío del dominio Ibero-Armoricano. El uso de técnicas de morfometría geométrica 3D así como análisis discriminante en una muestra abundante de ejemplares apendiculares del yacimiento de Lo Hueco y otros taxones de titanosaurio ha permitido caracterizar algunas diferencias entre los distintos clados de titanosaurios con el control de la variabilidad intraespecífica. Estos métodos se aplicaron también en análisis de superficies permitiendo reconocer similitudes morfológicas congruentes con convergencias morfofuncionales entre uno de los morfotipos de lithostrotios identificados en Lo Hueco (Morfortipo II) y formas gráciles de colossosaurios como Mendozasaurus neguyelap. Sin embargo, el Morfotipo I de Lo Hueco presentaría una morfología titanosauriana más típica, asemejándose a Jainosaurus cf. septentrionalis. El uso de análisis discriminantes permitió distinguir Colossosauria en base a la morfología de sus extremidades por primera vez. También se puede observar que la morfología de Colossosauria y Saltasauridae divergen de morfologías apendicular no autopodiales más típicamente titanosaurianas. Nuestros resultados sugieren que las grandes diferencias morfológicas de las extremidades de Saltasauridae con otros clados se debería a su especialización en comparación a otros titanosaurios muestrados en este estudio. El uso de semilandmarks de superficie y análisis discriminante permitió proponer una serie de potenciales caracteres osteológicos nuevos, útiles para el análisis filogenético, gracias a maximizar las diferencias existentes entre los diferentes clados muestreados.
Información de financiación
Financiadores
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Ministerio de Economía y Competitividad, Gobierno de España
- CGL2012-35199
- CGL2015-68363-P
- BES-2013-065509
- EEBB-I-16-11875
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Fundação para a Ciência e a Tecnologia
- CEECIND/00726/2017
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Junta de Comunidades de Castilla-La Mancha
- SBPLY/15/180601/000045
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Junta de Comunidades de Castilla-La Mancha
- SBPLY/16/180801/000017
- SBPLY/17/ 180801/000063
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Synthesys+ EU Programme
- GB-TAF-6153
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