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Earliest Mysticete from the Late Eocene of Peru Sheds New Light on the Origin of Baleen Whales
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Although combined molecular and morphological analyses point to a late middle Eocene (38–39 million years ago) origin for the clade Neoceti (Odontoceti, echolocating toothed whales plus Mysticeti, baleen whales, and relatives), the oldest knownmysticete fossil dates from the latest Eocene (about 34 million years ago) of Antarctica [1, 2]. Considering that the latter is not the most stemward mysticete in recent phylogenies and that Oligocene toothed mysticetes display a broad morphological disparity most likely corresponding to contrasted ecological niches, the origin of mysticetes from a basilosaurid ancestor and its drivers are currently poorly understood [1, 3–8]. Based on an articulated cetacean skeleton from the early late Eocene(Priabonian, around 36.4million years ago) of the Pisco Basin, Peru, we describe a new archaic tooth-bearing mysticete, Mystacodon selenensis gen. et sp. nov. Being the geologically oldest neocete (crown group cetacean) and the earliest mysticete to branch off described so far, the new taxon is interpreted as morphologically intermediate between basilosaurids and later toothed mysticetes, providing thus crucial information about the anatomy of the skull, forelimb, and innominate at these critical initial stages of mysticete evolution. Major changes in the morphology of the oral apparatus (including tooth wear) and flipper compared to basilosaurids suggest that suction and possibly benthic feeding represented key, early ecological traits accompanying the emergence of modern filter-feeding baleen whales’ ancestors.
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RBINS Staff Publications 2017
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Earliest mysticete from the late Eocene of Peru sheds new light on the origin of baleen whales
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RBINS Staff Publications 2017
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Earliest perissodactyls reveal large-scale dispersals during the PETM
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Perissodactyls were a diverse order of mammals in the Northern Hemisphere during the Paleogene, but very few species remain today. They first appear during the Paleocene–Eocene Thermal Maximum (PETM; 56 Ma) on the three continents of the Northern Hemisphere. Because they lack modern diversity, the study of their evolutionary history remains difficult, relying almost exclusively on fossils. In addition, their origin and early diversification remain elusive since all main groups appear at the same time with several genera and are already diverse, contrary to other modern mammal orders. Here, we investigate the early evolution of perissodactyls by analyzing a new dataset focusing on early species to obtain a new expansive phylogeny. This new topology, in combination with new observations and comparisons demonstrates that several genera are synonymous, simplifying the evolutionary picture of early perissodactyls. We show that the number of genera was overestimated and should be significantly reevaluated. These results also highlight fast dispersals of two genera, Pliolophus and Cardiolophus, on the three Northern continents, reflecting that of other modern mammals. The phylogeny also supports a potential Indo-Pakistani origin of perissodactyls. In addition, this large-scale phylogeny shows that many species that were named as “Hyracotherium” in the past (or sometimes “Eohippus”, the “dawn-horse”) and considered as “horses”, are not actually closely related to horses (Hippomorpha), including Hyracotherium itself, but can be considered as basal perissodactyls.
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RBINS Staff Publications 2026 OA
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Early and High Medieval (c. 650 AD - 1250 AD) charcoal production and its impact on woodland composition in the Northwest-European lowland: a study of charcoal pit kilns from Sterrebeek (Central Belgium).
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RBINS Staff Publications 2021
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Early and Middle Eocene (Ypresian-Lutetian) holoplanktonic Mollusca (Gastropoda) from Uzbekistan.
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RBINS Staff Publications
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Early and Middle Holocene human occupation of the Egyptian Eastern Desert: Sodmein Cave
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RBINS Staff Publications
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Early Bronze Age population substructure in the Khabur basin: preliminary evidence from Tell Brak, Tell Arbid and Tell Barri (Syria)
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Bioarchaeological studies of human remains examine past populations through their mortuary, biological, and socio-cultural contexts. Biological distance, or biodistance, analyses use both genetic and phenetic data to investigate biological relatedness. Biodistance studies frequently employ phenotypic characteristics, or the physical expression of genetic traits that can serve as a proxy for aDNA, to understand evolution, migration, kinship and social organisation. We used phenotypic variation in dental morphology to investigate the population history of the Khabur basin in Syria, during an important period of urbanisation in the Early Bronze Age (EBA, circa 3000-2100 BCE) that shaped the political, social, and economic history of ancient Mesopotamia. Non-metric dental traits from three EBA sites, Tell Brak (n=77), Tell Barri (n=16) and Tell Arbid (n=17), were recorded using the Arizona State University Dental Anthropology System (ASUDAS). Individuals from the sites were compared using the Gower distance matrix and Mean Measure of Divergence (MMD) to examine the difference between sites as population groups. The results suggest that while sites were ancestrally similar, the observed heterogeneity between sites and was related to the socio-political nature of the community. The greatest variation was observed for the samples from Tell Brak and Tell Barri, the capital and the second-rank administrative centre, respectively. Although Tell Arbid showed less variability, some population segmentation was observed between different burial loci.
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ANTHROPOLOGICA ET PREHISTORICA
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Bibliographic references
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Early Byzantine fish consumption and trade revealed by archaeoichthyology and isotopic analysis at Sagalassos, Turkey
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We document the dietary and economic role of fish at Sagalassos, a town in ancient Pisidia (southwest Turkey) for the Early Byzantine period (c. 550 – 700 CE) through a detailed analysis of animal bones and stable isotopes. The role of fish in the diet is quantified, for the first time, based on large samples of sieved remains retrieved during the excavation of a number of spaces in an urban residence. The table and kitchen refuse from the mansion shows that fish was a regular part of the diet. However, past isotopic work focused on human individuals excavated in the city’s necropolises, slightly postdating the faunal remains examined, did not reflect this consumption of aquatic food. The studied assemblage comprises at least 12 different fish taxa, including five marine species, a Nilotic fish and six Anatolian freshwater species. Since the origin of the freshwater fishes could not be unambiguously determined by zoogeography alone, we analyzed carbon, nitrogen and sulphur stable isotope ratios in archaeological fish bones from Sagalassos as well as in bones of modern fish collected at different sites in Turkey. We show that most freshwater fish, i.e., all cyprinid species, came from Lake Eğirdir. No evidence was found for fish from the local Aksu River basin. The exact origin of pike, which account for 3% of all freshwater fish, could not be directly determined due to a shortage of modern comparative data. Using the data obtained on the provenance of the fish, the ancient trade routes possibly used in the Early Byzantine period are reconstructed using a combination of archaeological, numismatic and historical data on past commercial relations.
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RBINS Staff Publications 2023
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Early cat taming in Egypt: a correction
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A cat skeleton from a Predynastic burial in Egypt that was previously labelled as Felis silvestris is reidentified as Felis chaus. This means that the previous claim needs to be withdrawn that the specimen represents early evidence for taming of Felis silvestris that ultimately led to domestication. However, the statement that the small felid has been held in captivity for several weeks, based on the presence of healed fractures, is still valid.
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RBINS Staff Publications
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Early dispersal for quadrupedal cetaceans: an amphibious whale from the middle Eocene of the southeastern Pacific
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RBINS Staff Publications 2019