First occurrence of hybodontid teeth in the Luoping Biota (Middle Triassic, Anisian) and recovery of the marine ecosystem after the end-Permian mass extinction

Wen, Wen; Zhang, Qiyue; Kriwet, Jürgen; Hu, Shixue; Zhou, Changyong; Huang, Jinyuan; Cui, Xindong; Xiao, Min; Benton, Michael J.

doi:10.1016/j.palaeo.2023.111471

Cited by 3 publications

(3 citation statements)

References 61 publications

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“…Specimen SC2022.35.3 (Figure 4g-l) has a straight crown and a labial peg but it lacks a main cusp, lateral cusplets, and ridges, indicating that this tooth was located in a posterior tooth file (i.e., closest to the jaw hinge). An increase in tooth width, along with increased distal inclination and/or offset of the medial cusp, from the symphysis towards the commissure, has been documented in Paleozoic hybodont sharks [48,[58][59][60]. Our observations of the Columnaodus witzkei gen. et sp.…”

Section: Remarkssupporting

confidence: 67%

“…Additionally, the lateral teeth of Lonchidion do not appear to become as large as those of Colmnaodus witzkei gen. et sp. nov. Teeth of Jurassic Luopingselache [48] are larger than those of Columnaodus witzkei get. et sp.…”

Section: Remarksmentioning

confidence: 80%

“…The teeth lack tubules within the crown, which may exclude placement in the family Acrodontidae [13,45]. If the genus Polyacrodus is treated as a nomen dubium (consisting of species more appropriately assigned to other hybodontid genera), the validity of the family Polyacrodontidae (which currently also includes Roongodus) can be called into question and is therefore not considered herein [46][47][48]. Furthermore, the tooth shape, including the crown and base, eliminates consideration of the currently monogeneric family Tristychiidae [49].…”

Section: Remarksmentioning

confidence: 99%

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A Description of the New Hybodont Shark Genus, Columnaodus, from the Burlington and Keokuk Limestones (Carboniferous, Mississippian, Osagean) of Illinois and Iowa, USA

Cicimurri,

Ciampaglio,

Hoenig

et al. 2024

Diversity

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Bonebeds occurring in exposures of the Burlington and Keokuk Limestones (Mississippian/Osagean) along the Iowa and Illinois border (USA) contain an abundant and diverse collection of chondrichthyan remains that includes teeth, spines, denticles, and coprolites. These remains represent cochliodont, hybodont, petalodont, ctenacanthid, symmoriid, and acanthodian (stem chondrichthyan) taxa. The thickest of these beds, herein referred to as the Burlington–Keokuk bonebed, occurs at the top of the Burlington Limestone and presents a remarkable opportunity to study the assemblage of mid-continent, Middle Mississippian chondrichthyans. Bulk matrix samples of this bonebed were collected from two quarries (Biggsville Quarry, Biggsville, IL, USA, and Nelson Quarry, Mediapolis, IA, USA) and disaggregated. Among the multitude of previously known taxa, several teeth represented a new genus and species of hybodont shark. Herein, we describe these teeth as Columnaodus witzkei (gen. et sp. nov.), a hybodontiform with dental features comparable to unnamed specimens reported from elsewhere.

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Section: Remarkssupporting

confidence: 67%

Section: Remarksmentioning

confidence: 80%