Endocranial Morphology of a Middle Miocene South American Dugongid and the Neurosensorial Evolution of Sirenians

Kerber, Leonardo; Moraes–Santos, Heloísa

doi:10.1007/s10914-021-09555-8

Cited by 7 publications

(1 citation statement)

References 48 publications

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“…This sedimentary unit was deposited during the Early to Middle Miocene (Ramos et al, 2004; Martinez et al, 2017; Aguilera et al, 2020, 2022) in coastal marine environments with a tidal regime, marginal lagoons with mangrove forests, and tropical storms, before the origin of the Amazon delta (Aguilera et al, 2020, 2022). A diverse fossil record of marine organisms has been found in the outcrops of this formation (e.g., Ramos et al, 2004; Tavora et al, 2010; Nogueira et al, 2011, 2019; Aguilera & Páes, 2012; Aguilera et al, 2014, 2017; Martinez et al, 2017; Nogueira & Nogueira, 2017; Kerber & Moraes‐Santos, 2021).…”

Section: Methodsmentioning

confidence: 99%

Scanning holotypes from the Vertebrate Paleontology Collection at the Museu Paraense Emilio Goeldi (Brazil): Tools for research and science outreach

Kerber

Moraes–Santos

Ramos

2023

Curator The Museum Journal

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The scanning of paleontological collections is increasingly important for morphological studies and science outreach. In addition to ensuring data sharing, digitization contributes to preserving morphological information in case of damage to the original specimens. In this communication, we aim to report digital versions of the holotypes from the Vertebrate Paleontology Collection at the Museu Paraense Emilio Goeldi, Brazil. For this purpose, eighteen holotypes of Early/Middle Miocene Teleostei from Pirabas Formation, northern Brazil, were scanned using microtomography, and cybertypes were proposed. The CT‐Scan data were stored in a virtual repository, can be freely accessed, and are available for future studies on the morphology of these specimens. Furthermore, these specimens are tiny and fragile, and digital versions can be an alternative to safely handling them. Finally, the digitization of important specimens, at least of holotypes, needs to be a standard practice in museum collections over the next years.

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Section: Methodsmentioning

confidence: 99%

Scanning holotypes from the Vertebrate Paleontology Collection at the Museu Paraense Emilio Goeldi (Brazil): Tools for research and science outreach

Kerber

Moraes–Santos

Ramos

2023

Curator The Museum Journal

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Morphology and postnatal ontogeny of the cranial endocast and paranasal sinuses of capybara (Hydrochoerus hydrochaeris), the largest living rodent

Ferreira

Dozo

Bubadué

et al. 2021

Journal of Morphology

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Recent studies have analyzed and described the endocranial cavities of caviomorph rodents. However, no study has documented the changes in the morphology and relative size of such cavities during ontogeny. Expecting to contribute to the discussion of the endocranial spaces of extinct caviomorphs, we aimed to characterize the cranial endocast morphology and paranasal sinuses of the largest living rodent, Hydrochoerus hydrochaeris, by focusing on its ontogenetic growth patterns. We analyzed 12 specimens of different ontogenetic stages and provided a comparison with other cavioids. Our study demonstrates that the adult cranial endocast of H. hydrochaeris is characterized by olfactory bulbs with an irregular shape, showing an elongated olfactory tract without a clear circular fissure, a marked temporal region that makes the endocast with rhombus outline, and gyrencephaly. Some of these traits change as the brain grows. The cranial pneumatization is present in the frontal and lacrimal bones. We identified two recesses (frontal and lacrimal) and one sinus (frontal). These pneumatic cavities increase their volume as the cranium grows, covering the cranial region of the cranial endocast. The encephalization quotient was calculated for each specimen, demonstrating that it decreases as the individual grows, being much higher in younger specimens than in adults. Our resultsshow that the ontogenetic stage can be a confounding factor when it comes to the general patterns of encephalization of extinct rodents, reinforcing the need for paleobiologists to take the age of the specimens into account in future studies on this subject to avoid age-related biases.

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What Can We Infer About the Behavior of Extinct Sirenians?

Domning

2022

Ethology and Behavioral Ecology of Marine Mammals

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Endocranial Morphology of a Middle Miocene South American Dugongid and the Neurosensorial Evolution of Sirenians

Cited by 7 publications

References 48 publications

Scanning holotypes from the Vertebrate Paleontology Collection at the Museu Paraense Emilio Goeldi (Brazil): Tools for research and science outreach

Scanning holotypes from the Vertebrate Paleontology Collection at the Museu Paraense Emilio Goeldi (Brazil): Tools for research and science outreach

Morphology and postnatal ontogeny of the cranial endocast and paranasal sinuses of capybara (Hydrochoerus hydrochaeris), the largest living rodent

What Can We Infer About the Behavior of Extinct Sirenians?

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