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Acanthodii
Sign in to saveAcanthodii or acanthodians is an extinct class of gnathostomes (jawed fishes). They are currently considered to represent a paraphyletic grade of various fish lineages basal to extant Chondrichthyes, which includes living sharks, rays, and chimaeras. Acanthodians possess a mosaic of features shared with both osteichthyans (bony fish) and chondrichthyans (cartilaginous fish). In general body shape, they were similar to modern sharks, but their epidermis was covered with tiny rhomboid platelets like the scales of holosteians (gars, bowfins).
Acanthodians were an extinct group of jawed fishes that lived long ago and shared features with both modern sharks and bony fishes, including shark-like bodies covered with tiny diamond-shaped scales. Scientists believe they represent an evolutionary stage that came before the split between today's sharks and rays on one side and bony fishes on the other, making them important for understanding how these major fish groups evolved.
AI-generated from the Wikipedia summary — may contain errors.
Wikidata facts
- Parent taxon
- Gnathostomata
- Image
- Mesacanthus Parexus Ischnacanthus.JPG
Show 7 more facts
- Commons category
- Chondrichthyes
- taxon name
- Acanthodii
- taxon rank
- class
- topic's main category
- Category:Acanthodii
- taxon common name
- akantodi
- topic has template
- Template:Taxonomy/Acanthodii
- on focus list of Wikimedia project
- Wikipedia:Vital articles/Level/4
Sources (1)
via Wikidata · CC0
Article · Italiano
Gli acantodi (Acanthodii), a volte chiamati impropriamente "squali spinosi", sono una classe di pesci estinti, vissuti dal Siluriano inferiore fino al Permiano superiore (da 430 a 250 milioni di anni fa).
Abstract from DBpedia / Wikipedia · CC BY-SA