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Cetacean Paleobiology

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Morphology of the Eye of the Southern Right Whales (Eubalaena australis)

The aim of this study was to describe the eye anatomy of the southern right whale (Eubalaena australis), and it was found that the eyes of the calves differed from those of the adults in having less periorbital fat surrounding the eyeball.
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Miocene Marine Transgressions: Paleoenvironments and Paleobiodiversity

Two major marine transgressions covered part of Patagonia during the Miocene and both are recorded in the Peninsula Valdes region. The older (early Miocene) is represented by the volumetrically…
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Eocene Basilosaurid Whales from the La Meseta Formation, Marambio (Seymour) Island, Antarctica

Abstract. Basal fully aquatic whales, the basilosaurids are worldwide known from Bartonian—Priabonian localities, indicating that this group was widely distributed during the late middle Eocene. In…
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The early Miocene balaenid Morenocetus parvus from Patagonia (Argentina) and the evolution of right whales

The analysis of cranial and periotic morphology of Morenocetus suggest that some of the specialized morphological traits of modern balaenids were acquired by the early Miocene and have remained essentially unchanged up to the present, while optimization of body length on the phylogeny of Balaenidae suggests that the primitive condition was a relatively small body length.
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Anatomy of nasal complex in the southern right whale, Eubalaena australis (Cetacea, Mysticeti)

This work investigates the nasal anatomy, osteology and myology of the southern right whale, Eubalaena australis, and makes comparisons with other mysticetes, finding a novel structure, not reported previously in any mysticete, is the presence of a vascular tissue covering the lower nasal passage.
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Diaphorocetus poucheti (Cetacea, Odontoceti, Physeteroidea) from Patagonia, Argentina: one of the earliest sperm whales

This work re-examines Diaphorocetus in detail and declares it a nomen protectum, demonstrating that facial asymmetry and a clearly defined supracranial basin have characterized this lineage for at least 20 Ma.
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A New Beaked Whale (Cetacea, Odontoceti) from the Late Miocene of Patagonia, Argentina

A phylogenetic analysis including 25 ziphiid genera and 31 characters shows Notoziphius as nested within Ziphiidae in a basal clade with Aporotus, Beneziphius, Messapicetus, and Ziphirostrum.
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Juvenile morphology: A clue to the origins of the most mysterious of mysticetes?

It is shown that at least two features, the ascending process of the maxilla and the coronoid process, arise from substantially different precursors early during ontogeny and therefore likely do not represent genuine synapomorphies and may help to reconcile morphological and molecular evidence.
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Gigantic mysticete predators roamed the Eocene Southern Ocean

Abstract Modern baleen whales (Mysticeti), the largest animals on Earth, arose from small ancestors around 36.4 million years ago (Ma). True gigantism is thought to have arisen late in mysticete…
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