Dapediidae Temporal range: Ladinian–Tithonian PreꞒ Ꞓ O S D C P T J K Pg N
Fossil specimen of Dapedium politum
Artist's reconstruction of Sargodon
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Infraclass:	Holostei (?)
Order:	†Dapediiformes Thies & Waschkewitz, 2016
Family:	†Dapediidae Lehman, 1966
Genera
†Aetheolepis †Dandya †Dapedium †Hemicalypterus †Heterostrophus †Paradapedium †Sargodon †Scopulipiscis †Tetragonolepis

Dapediidae is an extinct family of neopterygian ray-finned fish that lived from the Middle Triassic to Late Jurassic (Ladinian to Tithonian).^[1] 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.^[2]

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]

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]

v t e Neopterygii
Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Class: Actinopterygii Clade: Actinopteri Actinopterygii see Actinopterygii Neopterygii see below↓ Neopterygii
Neopterygii †Besania †Boreichthys †Caelatichthys †Cephaloxenus †Chrotichthys †Dollopterus †Frodoichthys †Gimlichthys †Habroichthys †Hulettia †Pristisomus †Tungusichthys †Venusichthys †Zeuchthiscus †Bobasatraniiformes? †Guildayichthyidae? †Pholidopleuriformes? Arctosomus Australosomus Gracilignathichthys Macroaethes Pholidopleurus †Redfieldiiformes? Atopocephala Brookvalia Calaichthys Cionichthys Daedalichthys Denwoodichthys Dictyopyge Endemichthys Geitonichthys Helichthys Hiascoactinus Ischnolepis Lasalichthys Leighiscus Mauritanichthys Molybdichthys Pacorichthys Phlyctaenichthys Redfieldius Sakamenichthys Schizurichthys Sinkiangichthys? †Platysiagidae Caelatichthys? Helmolepis Platysiagum †Polzbergiiformes Hydropessum? Cleithrolepididae Cleithrolepidina Cleithrolepis Polzbergiidae Felberia Luopingichthys? Polzbergia Serrolepis Stoppania †Colobodontidae Chaohuperleidus? Colobodus Crenilepis Dactylolepis? Engycolobodus? Feroxichthys Gabanellia? Nephrotus? †Perleididae Aetheodontus? Alvinia? Chaohuperleidus? Ctenognathichthys? Daninia Diandongperleidus? Dipteronotus? Endennia? Eoperleidus Fuyuanperleidus? Luopingperleidus? Manlietta Megaperleidus? Meidiichthys Meridensia? Moradebrichthys? Paraperleidus Peltoperleidus? Perleidus Plesiofuro? Plesioperleidus Procheirichthys? Teffichthys? Tripelta †Louwoichthyiformes Peltoperleidus? Louwoichthyidae Ctenognathichthys? Louwoichthys Luopingichthys? Pseudobeaconiidae Anatoia Caminchaia Dipteronotus? Echentaia Mendocinichthys Pasambaya Pseudobeaconia †Luganoiiformes Altisolepis? Fuyuanperleidus? Luganoia †Peltopleuriformes Habroichthys? Peltopleuridae Altisolepis? Nannolepis Peltopleurus Placopleurus Thoracopteridae Gigantopterus Italopterus Peripeltopleurus Potanichthys Thoracopterus Wushaichthys †Dapediidae Aetheolepis Dandya Dapedium Hemicalypterus Heterostrophus Paradapedium Sargodon Scopulipiscis Tetragonolepis †Pycnodontiformes see Pycnodontiformes Holostei Ginglymodi see Ginglymodi includes gars Halecomorphi see Halecomorphi includes bowfin Teleostei see Teleostei includes the majority of modern fish