Morphology of the sacral region and reproductive strategies of Metriorhynchidae: a counter-inductive approach
Morphological and physiological features indicate Metriorhynchidae as the only group of crocodylomorphs with a pelagic lifestyle. Some of these features have evolved convergently in several clades of tetrapods secondarily adapted to aquatic life. One striking feature of metriorhynchids as compared t...
| Autores principales: | , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2017
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/87433 |
| Aporte de: |
| id |
I19-R120-10915-87433 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Paleontología Ciencias Naturales Crocodylomorpha Jurassic metriorhynchids Neuquén Basin Thalattosuchia viviparity |
| spellingShingle |
Paleontología Ciencias Naturales Crocodylomorpha Jurassic metriorhynchids Neuquén Basin Thalattosuchia viviparity Herrera, Laura Yanina Fernández, Marta Susana Lamas, Susana Gisela Campos, Lisandro Marianella Talevi Brandoni de Gasparini, Zulma Nélida Morphology of the sacral region and reproductive strategies of Metriorhynchidae: a counter-inductive approach |
| topic_facet |
Paleontología Ciencias Naturales Crocodylomorpha Jurassic metriorhynchids Neuquén Basin Thalattosuchia viviparity |
| description |
Morphological and physiological features indicate Metriorhynchidae as the only group of crocodylomorphs with a pelagic lifestyle. Some of these features have evolved convergently in several clades of tetrapods secondarily adapted to aquatic life. One striking feature of metriorhynchids as compared to other crocodylomorphs is the morphology of the pelvic region (i.e., ventrally deflected sacral ribs and reduced pelvic girdle), which increases significantly the depth of this region. This morphology, as a whole, resembles that of other viviparous Mesozoic marine reptiles not phylogenetically related to metriorhynchids. We tested two alternative hypotheses of reproductive strategies in this clade: oviparity vs. viviparity. Given the lack of direct evidence supporting one or the other, we explored the use of evidence that may disconfirm either of these hypotheses. Using this counter-inductive approach, we found no cases contradicting viviparity in metriorhynchids, except for their phylogenetic position as archosaurs. A survey of reproductive modes amongst amniotes depicts the evolutionary plasticity of the transition to viviparity, and a widespread occurrence among tetrapods secondarily adapted to a marine life. Assuming oviparity for metriorhynchids implies egg-laying out of the water. However, their postcranial morphology (i.e., features of fore and hind limbs, pelvic girdle, and tail) contradicts this possibility. In this context, we rejected oviparity for metriorhynchids. |
| format |
Articulo Articulo |
| author |
Herrera, Laura Yanina Fernández, Marta Susana Lamas, Susana Gisela Campos, Lisandro Marianella Talevi Brandoni de Gasparini, Zulma Nélida |
| author_facet |
Herrera, Laura Yanina Fernández, Marta Susana Lamas, Susana Gisela Campos, Lisandro Marianella Talevi Brandoni de Gasparini, Zulma Nélida |
| author_sort |
Herrera, Laura Yanina |
| title |
Morphology of the sacral region and reproductive strategies of Metriorhynchidae: a counter-inductive approach |
| title_short |
Morphology of the sacral region and reproductive strategies of Metriorhynchidae: a counter-inductive approach |
| title_full |
Morphology of the sacral region and reproductive strategies of Metriorhynchidae: a counter-inductive approach |
| title_fullStr |
Morphology of the sacral region and reproductive strategies of Metriorhynchidae: a counter-inductive approach |
| title_full_unstemmed |
Morphology of the sacral region and reproductive strategies of Metriorhynchidae: a counter-inductive approach |
| title_sort |
morphology of the sacral region and reproductive strategies of metriorhynchidae: a counter-inductive approach |
| publishDate |
2017 |
| url |
http://sedici.unlp.edu.ar/handle/10915/87433 |
| work_keys_str_mv |
AT herreralaurayanina morphologyofthesacralregionandreproductivestrategiesofmetriorhynchidaeacounterinductiveapproach AT fernandezmartasusana morphologyofthesacralregionandreproductivestrategiesofmetriorhynchidaeacounterinductiveapproach AT lamassusanagisela morphologyofthesacralregionandreproductivestrategiesofmetriorhynchidaeacounterinductiveapproach AT camposlisandro morphologyofthesacralregionandreproductivestrategiesofmetriorhynchidaeacounterinductiveapproach AT marianellatalevi morphologyofthesacralregionandreproductivestrategiesofmetriorhynchidaeacounterinductiveapproach AT brandonidegasparinizulmanelida morphologyofthesacralregionandreproductivestrategiesofmetriorhynchidaeacounterinductiveapproach |
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Repositorios |
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1764820490046668800 |