Dapediidae

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Dapediidae
Dapedium politum.jpg
Fossil specimen of Dapedium politum
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Infraclass: Holostei (?)
Order: †Dapediiformes
Thies & Waschkewitz, 2016
Family: †Dapediidae
Lehman, 1966
Genera

Dapediidae is an extinct family of neopterygian ray-finned fish that lived during the Triassic and Jurassic periods. It is the only family of the order Dapediiformes. Its members were historically placed within the ginglymodian family Semionotidae, but were moved to their own family in 1966.[1]

Description[]

Dapediids had deep, laterally flattened bodies covered in thick ganoid scales, which gave them a resemblance to the pycnodontiforms, a group they may or may not be related to.[2] Their teeth were adapted towards a durophagous diet; some dapediids fed on hard-shelled invertebrates,[3] while at least one genus (Hemicalypterus) may have been herbivorous.[4]

Classification[]

Dapediids are usually considered to be either basal ginglymodians[1][4] or stem group representatives of the wider clade Holostei,[2][5] but some studies have found them to be early-diverging stem-teleosts instead.[2]

References[]

  1. ^ a b 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.
  2. ^ a b c 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): 180497. doi:10.1098/rsos.180497.
  3. ^ 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.
  4. ^ a b 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): e0163657. doi:10.1371/journal.pone.0163657.
  5. ^ López-Arbarello, A.; Sferco, E. (2018). "Neopterygian phylogeny: the merger assay". Royal Society Open Science. 5 (3): 172337. doi:10.1098/rsos.172337.


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