Producción CyT
Congreso
Autoría
PAOLUCCI, FLORENCIA
;
Buono, Mónica R.
;
Fernández, Marta S.
Fecha
2024
Editorial y Lugar de Edición
x
Resumen
Información suministrada por el agente en
SIGEVA
The Physeteroidea, or sperm whales, are the earliest crown odontocete lineage to diverge with three extant relatives: the giant sperm whale (Physeter macrocephalus), the pygmy spermwhale (Kogia breviceps), and the dwarf sperm whale (Kogia sima). Physeteroids originated inthe late Oligocene and reached their highest diversity during the Miocene. Patagonia(Argentina) has the most important Miocene fossil record of physeteroids in the southwesternAtlantic Ocean, with at least four taxa described i...
The Physeteroidea, or sperm whales, are the earliest crown odontocete lineage to diverge with three extant relatives: the giant sperm whale (Physeter macrocephalus), the pygmy spermwhale (Kogia breviceps), and the dwarf sperm whale (Kogia sima). Physeteroids originated inthe late Oligocene and reached their highest diversity during the Miocene. Patagonia(Argentina) has the most important Miocene fossil record of physeteroids in the southwesternAtlantic Ocean, with at least four taxa described in the 19th and 20th centuries. In thiscontribution, we re-studied these Patagonian taxa, analyzing their anatomy, taxonomy, andphylogenetic relationships, and providing data about their paleobiology (e.g. feeding methods,body size, development of nasal complex). For this, detailed anatomical studies of all taxa were carried out, as well as a phylogenetic analysis under parsimony and heuristic searches. For paleobiological studies,bone correlates of soft tissue structures were explored in the fossil specimens based on theanatomical information provided by the extant taxa. Our analysis shows that the MiocenePatagonian physeteroid diversity includes four valid taxa; Diaphorocetus poucheti, Idiorophuspatagonicus, aff. Livyatan, and Cozzuoliphyseter rionegrensis. Preaulophyseter gualichensis isconsidered as nomen dubium. Idiorophus is the only Patagonian physeteroid recovered withinPhyseteridae, the remaining being stem physeteroids. Most Patagonian species were small tomedium-sized (Diaphorocetus 3.46 m, Cozzuoliphyseter 4.37 m, Idiorophus 6.07 m), with aunique record of a large to giant form (more than 8 m, aff. Livyatan). The development of thenasal complex differs between Patagonian species, but in no case does it extend along therostrum. The cranio-mandibular-dental morphology of the Patagonian physeteroids (except aff. Livyatan) shows intermediate features between a “macroraptorial” and a suction-feeding form,suggesting a combined raptorial feeding strategy using the raptorial method to capture prey andthen using suction to transport them into the oral cavity. Taken together, these results allow usto propose that different ecotypes of sperm whales inhabited Patagonian waters throughout theMiocene.
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Palabras Clave
PHYSETEROIDSPATAGONIAMIOCENE