Dapedium
| Dapedium | ||||||||||||
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Dapedium sp. from the Posidonia slate at Holzmaden . |
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| Temporal occurrence | ||||||||||||
| Upper Triassic to Lower Jura | ||||||||||||
| 215 to 164.7 million years | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Dapedium | ||||||||||||
| Leach , 1822 | ||||||||||||
Dapedium is a genus of extinct bony fish from the subclass of the Neuflosser (Neopterygii).
William Elford Leach published the first description of the genus in 1822 with the type species D. politum from the early Lower Jurassic (lower Lias) by Lyme Regis ( Jurassic Coast ). In 1983 Tintori described the species D. raetium from the Upper Triassic of Lombardy .
body
The body is strongly flattened and stocky at the sides, the skin covered with thick, rhombic ganoid scales. Depending on the species, the animal can reach a length of 10 to 40 cm. The skull is armored with bumpy plates of bone, especially many-limbed in the orbital region . The pectoral and ventral fins are small, the dorsal and anal fins are long.
Habitat and way of life
Dapedium lived in the European Jurassic Sea , a shelf and marginal sea of the Tethys . The conical dentition suggests that dapedium is similar to the recent sea bream (Sparidae) , which has a similar body shape, from wired invertebrates , e.g. B. mussels or sea urchins, fed.
Systematics
Dapedium is the best-researched species of the Dapedidae family, originally assigned to the Semionotiformes . Recently the family has been classified in its own order (Dapediiformes) at the base of the bone organoids (Holostei).
literature
- Detlev Thies, Annette Herzog: New information on † Dapedium LEACH 1822 (Actinopterygii, † Semionotiformes). In: Gloria Arratia, Hans-Peter Schultze (Ed.): Mesozoic Fishes. Volume 2: Systematics and Fossil Record. Pfeil, Munich 1999, ISBN 3-931516-48-2 , pp. 143-152.
Individual evidence
- ^ Fiann M. Smithwick. Feeding ecology of the deep-bodied fish Dapedium (Actinopterygii, Neopterygii) from the Sinemurian of Dorset, England. Palaeontology, 2015; DOI: 10.1111 / pala.12145
- ^ Adriana López-Arbarello, Emilia Sferco: Neopterygian phylogeny: the merger assay. Royal Society Open Science, 21 March 2018. DOI: 10.1098 / rsos.172337
