Biology:Dapediidae
Dapediidae is an extinct family of neopterygian ray-finned fish, likely belonging to the clade Ginglymodi and thus distantly related to modern gars. They lived from the Middle Triassic to the Late Jurassic (Ladinian to Tithonian).[1] Its members were historically placed within the ginglymodian family Semionotidae, but were moved to their own family in 1966, and subsequently to the separate order Dapediiformes in 2016.[2]
Description
Dapediids had deep, laterally flattened circular bodies covered in thick ganoid scales, which gave them a resemblance to the pycnodontiforms, a group they may or may not be related to.[3] Their teeth were adapted towards a durophagous diet; some dapediids fed on hard-shelled invertebrates,[4] while at least one genus (Hemicalypterus) may have been herbivorous.[5]
Classification
Dapediids are usually considered to be either basal ginglymodians[2][5] or stem group representatives of the wider clade Holostei,[3][6] but some studies have found them to be early-diverging stem-teleosts instead.[3] In 2025 the Ladinian Guizhoubrachysomus was identified as an early-diverging dapediid, and the group was recovered within Semionotiformes as the sister group of Macrosemiidae.[7]
References
- ↑ Cawley, John J.; Marramà, Giuseppe; Carnevale, Giorgio; Villafaña, Jaime A.; López‐Romero, Faviel A.; Kriwet, Jürgen (February 2021). "Rise and fall of †Pycnodontiformes: Diversity, competition and extinction of a successful fish clade" (in en). Ecology and Evolution 11 (4): 1769–1796. doi:10.1002/ece3.7168. ISSN 2045-7758. PMID 33614003.
- ↑ 2.0 2.1 Thies, D.; Waschkewitz, J. (2016). "Redescription of Dapedium pholidotum (Agassiz, 1832) (Actinopterygii, Neopterygii) from the Lower Jurassic Posidonia Shale, with comments on the phylogenetic position of Dapedium Leach, 1822". Journal of Systematic Palaeontology 14 (4): 339–364. doi:10.1080/14772019.2015.1043361. https://www.researchgate.net/publication/281415190.
- ↑ 3.0 3.1 3.2 Latimer, A. E.; Giles, S. (2018). "A giant dapediid from the Late Triassic of Switzerland and insights into neopterygian phylogeny". Royal Society Open Science 5 (8). doi:10.1098/rsos.180497. PMID 30225040. Bibcode: 2018RSOS....580497L.
- ↑ Smithwick, F. M. (2015). "Feeding ecology of the deep-bodied fish Dapedium (Actinopterygii, Neopterygii) from the Sinemurian of Dorset, England". Palaeontology 58 (2): 293–311. doi:10.1111/pala.12145. Bibcode: 2015Palgy..58..293S.
- ↑ 5.0 5.1 Gibson, S. Z. (2016). "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". PLOS ONE 11 (9). doi:10.1371/journal.pone.0163657. PMID 27657923. Bibcode: 2016PLoSO..1163657G.
- ↑ López-Arbarello, A.; Sferco, E. (2018). "Neopterygian phylogeny: the merger assay". Royal Society Open Science 5 (3). doi:10.1098/rsos.172337. PMID 29657820. Bibcode: 2018RSOS....572337L.
- ↑ Xu, G.; Ma, X.; Liu, L.; Liao, J.; Tan, F.; Sun, C. (2025). "Taxonomic Revision of †Guizhoubrachysomus minor (†Semionotiformes, Ginglymodi) From the Middle Triassic (Ladinian) Xingyi Biota in Guizhou and Yunnan, China". Contributions from the Museum of Paleontology, University of Michigan 37 (4): 79–92. doi:10.7302/27712.
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Template:Ginglymodi Wikidata ☰ Q25387686 entry
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