ArticlePloS one
Redescription and Phylogenetic Placement of †Hemicalypterus weiri Schaeffer, 1967 (Actinopterygii, Neopterygii) from the Triassic Chinle Formation, Southwestern United States: New Insights into Morphology, Ecological Niche, and Phylogeny.
Article in PloS one. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed, 19 citations in OpenAlex.
- A bristle-nosed Jurassic ray-finned fish (Actinopterygii) bears true dermal odontodes on its snout.Journal of anatomy · 2026Article
- Rise and fall of †Pycnodontiformes: Diversity, competition and extinction of a successful fish clade.Ecology and evolution · 2021Article
- A giant dapediid from the Late Triassic of Switzerland and insights into neopterygian phylogeny.Royal Society open science · 2018Article
- Evolution of caudal fin ray development and caudal fin hypural diastema complex in spotted gar, teleosts, and other neopterygian fishes.Developmental dynamics : an official publication of the American Association of Anatomists · 2018Article
- Neopterygian phylogeny: the merger assay.Royal Society open science · 2018Article
- A new species of the deep-bodied actinopterygianPeerJ · 2018Article
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Abstract
The actinopterygian fish †Hemicalypterus weiri Schaeffer, 1967 is herein redescribed and rediagnosed based on new information collected from reexamination of museum specimens as well as examination of recently collected specimens from the Upper Triassic Chinle Formation of San Juan County, Utah, United States. †Hemicalypterus is distinguishable by its deep, disc-shaped compressed body; ganoid-scaled anterior half and scaleless posterior half; spinose, prominent dorsal and ventral ridge scales anterior to dorsal and anal fins; hem-like dorsal and anal fins with rounded distal margins; small mouth gape; and specialized, multicuspid dentition. This type of dentition, when observed in extant fishes, is often associated with herbivory, and †Hemicalypterus represents the oldest known ray-finned fish to have possibly exploited an herbivorous trophic feeding niche. A phylogenetic analysis infers a placement of †Hemicalypterus within †Dapediiformes, with †Dapediiformes being recovered as sister to Ginglymodi within holostean actinopterygians.
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