The tympanoperiotic complex of the blue whale, Balaenoptera musculus DOI
Michelangelo Bisconti, Mark Bosselaers,

Camille Locatelli

et al.

The Anatomical Record, Journal Year: 2024, Volume and Issue: 307(9), P. 3041 - 3070

Published: Jan. 31, 2024

The tympanoperiotic complex of a blue whale Balaenoptera musculus is described and compared to the homologous structures in other extant fossil baleen species. periotic tympanic bulla represent informative anatomical regions both functional phylogenetic studies for this reason micro-CT scan bones was performed order better characterize their external aspect reconstruct inner structures. In particular, cochlea, semicircular canals associated portions are reconstructed so that these may be used analyses. We observed characterized by presence strong dorsal protrusion which posteriorly bordered previously undescribed morphological character we name posterotransverse fossa. peculiar shape anterior process en echelon organization posterior foramina pars cochlearis also compared. From perspective, confirmed closely related fin whale, physalus, but it suggested, based on ear bone characters only, diverged before balaenopterid species phylogeny Balaenopteridae. This placement supports series observations suggesting an early-diverging member Balaenoptera. Our results help decipher evolutionary origin largest living animal, allowing new more detailed analyses record.

Language: Английский

Pygmy Right Whale Caperea marginata (Gray, 1846) DOI
Guilherme Frainer, Simon H. Elwen

Published: Jan. 1, 2024

Language: Английский

Citations

4
Anatomy and Relationships of a New Gray Whale from the Pliocene of Piedmont, Northwestern Italy DOI Creative Commons
Michelangelo Bisconti,

Piero Damarco,

Lorenza Marengo

et al.

Diversity, Journal Year: 2024, Volume and Issue: 16(9), P. 547 - 547

Published: Sept. 5, 2024

A new fossil gray whale genus and species, Glaucobalaena inopinata, is established based on craniomandibular remains from the Pliocene Sabbie d’Asti Formation, Piedmont, northwestern Italy. The holotype (MGPT-PU 19512) consists of two cranial fragments corresponding to posterolateral corners skull, including both partial periotics, in posterior portion right mandibular ramus preserving condyle angular process. taxon characterized by (eschrichtiid) synapomorphies mandible (dorsally raised with articular surface faced dorsoposteriorly, well-developed robust process mandible) earbone (massive transverse elongation pars cochlearis, indistinct flange ventrolateral tuberosity, triangular short anterior periotic). CT scan allowed us reconstruct tridimensional renderings periotic, revealing dorsal morphology this bone. phylogenetic analysis confirmed inclusion inopinata within Eschrichtiidae (the family whom whales are included) showed that it monophyletic Gricetoides aurorae; our results show Eschrichtioides gastaldii sister group Eschrichtius. Our work lends further support idea a separate baleen whales, specialized ecomorphological characters evident skull architecture.

Language: Английский

Citations

3
The tympanoperiotic complex of the blue whale, Balaenoptera musculus DOI
Michelangelo Bisconti, Mark Bosselaers,

Camille Locatelli

et al.

The Anatomical Record, Journal Year: 2024, Volume and Issue: 307(9), P. 3041 - 3070

Published: Jan. 31, 2024

The tympanoperiotic complex of a blue whale Balaenoptera musculus is described and compared to the homologous structures in other extant fossil baleen species. periotic tympanic bulla represent informative anatomical regions both functional phylogenetic studies for this reason micro-CT scan bones was performed order better characterize their external aspect reconstruct inner structures. In particular, cochlea, semicircular canals associated portions are reconstructed so that these may be used analyses. We observed characterized by presence strong dorsal protrusion which posteriorly bordered previously undescribed morphological character we name posterotransverse fossa. peculiar shape anterior process en echelon organization posterior foramina pars cochlearis also compared. From perspective, confirmed closely related fin whale, physalus, but it suggested, based on ear bone characters only, diverged before balaenopterid species phylogeny Balaenopteridae. This placement supports series observations suggesting an early-diverging member Balaenoptera. Our results help decipher evolutionary origin largest living animal, allowing new more detailed analyses record.

Language: Английский

Citations

0