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The skull of Spheniscus urbinai (1 Viewer)

Fred Ruhe

Well-known member
Carolina Acosta Hospitaleche, Ariana Paulina‐Carabajal;& Roberto Yury‐Yáñez, 2021

The skull of the Miocene Spheniscus urbinai (Aves, Sphenisciformes): osteology, brain morphology, and the cranial pneumatic systems

Journal of Anatomy. in press.
doi:10.1111/joa.13403. PMID 33576081

Abstract: https://pubmed.ncbi.nlm.nih.gov/33576081/

Spheniscus urbinai represents one of four extinct Spheniscus species from the Cenozoic of southern South America, known from several poorly described diversely complete skulls and postcranial elements. Here, we present a review of the cranial osteology of all known specimens (collected in Argentina, Chile, and Peru), including a paleoneurological analysis using CT scans, and an exploration of its cranial pneumaticity compared to other extinct and living seabirds. Our results show that among Spheniscus species, S. urbinai exhibits slightly greater cranial pneumaticity than the living species. Additionally, we confirm previous findings which indicate that the marked reduction of cranial pneumaticity-which is characteristic of living penguins-occurred early during the Eocene (as observed in the Antarctic penguin MLP 12-I-20-1, but not in the coeval Anthropornis).


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