New specimens and species of the Oligocene toothed baleen whale
Por um escritor misterioso
Last updated 23 dezembro 2024
Baleen whales (Mysticeti) are gigantic filter-feeding cetaceans possessing the unique soft tissue structure baleen and lacking adult teeth; Oligocene fossils have revealed a wealth of early diverging tooth-bearing mysticetes highlighting the transition from archaeocete ancestors to early toothless baleen-bearing eomysticetid whales. The archaeocete-like, toothed mysticete Coronodon havensteini from the lower Oligocene Ashley Formation of South Carolina possesses a number of peculiar aspects of feeding morphology suggesting dental filter-feeding in the earliest diverging mysticete lineage. New fossils of Coronodon are described in detail, including (1) supplementary description of the holotype skull and skeleton of Coronodon havensteini; (2) description of two new juvenile skulls of C. havensteini and a partial skull and postcranial skeleton of an adult; (3) description of the new species Coronodon planifrons n.sp.; and (4) description of the new species Coronodon newtonorum. New specimens of Coronodon havensteini include a partial adult skeleton preserving new elements for the species including incisors, numerous upper premolars and molars, lower m4, scapula, lumbar, and caudal vertebrae, and two juvenile skulls with tympanoperiotics and teeth. Fossils from the overlying unit, the Chandler Bridge Formation, represent two new species: Coronodon newtonorum n. sp. and Coronodon planifrons n. sp. Coronodon newtonorum possesses a concave-up alveolar profile, a mandibular condyle elevated far above the toothrow, and a gracile periotic resembling those of juvenile C. havensteini. Coronodon planifrons n. sp. possesses a horizontal supraorbital process, successively smaller upper molars, massively inflated periotic, and longer intertemporal region. Coronodon planifrons n. sp. preserves one of the most complete vertebral columns among toothed mysticetes, indicating nine thoracic vertebrae, ten lumbar vertebrae, and at least 20 caudal vertebrae. The column exhibits a somewhat stabilized caudal peduncle with enlarged lumbocaudal vertebrae, and rectangular terminal caudals indicate the presence of tail flukes. Juvenile skulls reveal several ontogenetic trends in Coronodon havensteini, including the anterior migration of the orbitotemporal crest, anteroposterior elongation of the intertemporal region, inflation of the body of the periotic, enlargement of the tympanic bulla, and continued postnatal emergence of the premolars and molars from their alveoli. Disarticulated skulls suggest a degree of rostral kinesis in this genus. Phylogenetic analysis of the largest assembled supermatrix of Mysticeti (n =138 OTUs; four archaeocetes, 10 odontocetes, 124 mysticetes; 391 morphological and 27,225 molecular characters) confirms placement of Coronodon as the earliest diverging lineage of Mysticeti under equally weighted analyses whereas implied weighting places Coronodon and similar taxa outside Neoceti, prompting a review of character transformations at the base of Neoceti.
New specimens and species of the Oligocene toothed baleen whale Coronodon from South Carolina and the origin of Neoceti [PeerJ] : r/Paleontology
Lateral palatal foramina do not indicate baleen in fossil whales
A new Early Oligocene toothed 'baleen' whale (Mysticeti: Aetiocetidae) from western North America: one of the oldest and the smallest
Diversity, Free Full-Text
A new fossil species supports an early origin for toothed whale echolocation
Figure 2 from Archaeocete-like jaws in a baleen whale
Where does baleen whales come from? - Quora
New specimens and species of the Oligocene toothed baleen whale Coronodon from South Carolina and the origin of Neoceti [PeerJ]
Tokarahia: large filter feeding baleen whales (Eomysticetidae) from the Oligocene of New Zealand, Paleontology, Department of Geology
New specimens and species of the Oligocene toothed baleen whale Coronodon : r/paleonews
Three new species of extinct baleen whales found
WhaleWednesday Does your back hurt today? Probably not as bad as this ancient whale! These are vertebrae from the base of the tail of an extinct toothed baleen whale (closely related to
New Zealand Eomysticetidae: baleen whale origins
Baleen whale - Wikipedia
Dorudon, an ancient whale
Recomendado para você
-
Spelayon Consultoria EPP added - Spelayon Consultoria EPP23 dezembro 2024
-
Notícias – Senar – Programa CNA Jovem23 dezembro 2024
-
Photino Birds, Kardashev Scale Wiki23 dezembro 2024
-
Relatório Anual Cecav 2021 - ICMBio - CECAV, PDF Online23 dezembro 2024
-
Agência PUC de comunicação é finalista em concurso da APP23 dezembro 2024
-
EQUIPE carstologia23 dezembro 2024
-
Neocarus spelaion sp. n. (Parasitiformes, Opilioacaridae), a new species of cave dwelling Neocarus from Minas Gerais state, Brazil23 dezembro 2024
-
Full article: Three new species of the genus Speocera (Araneae23 dezembro 2024
-
Hotspot in ferruginous rock may have serious implications in23 dezembro 2024
-
A new species of cave-dwelling Neocarus (Opilioacaridae) from Brazil with highly modified dimorphic characters in males23 dezembro 2024
você pode gostar
-
crvena zvezda2 Logo PNG Transparent & SVG Vector - Freebie Supply23 dezembro 2024
-
Gears 5' Might Be Coming in September (Rumor)23 dezembro 2024
-
Ghost Mask MW2 Call of Duty Mask Unisex COD Ghost Mask Halloween23 dezembro 2024
-
5 Formas de Jogar Animal Crossing New Horizons Online Gratuitamente23 dezembro 2024
-
Melhores jogos de futebol para Android em 202323 dezembro 2024
-
Chloë Grace Moretz Signs With CAA – Deadline23 dezembro 2024
-
Prime Minister Dahal directs heads of security agencies to probe into Gongabu looting23 dezembro 2024
-
White Nike T Shirt Roblox - Nike Emoji,Nike Swoosh Emoji - free23 dezembro 2024
-
Multiplayer Online Games Joystick Vector SVG Icon - SVG Repo23 dezembro 2024
-
Bachelor in Paradise' Recap, Season 7, Episode 223 dezembro 2024