View source for Parexus

{{Short description|Extinct genus of cartilaginous fishes}}
{{more citations needed|date=September 2014}}
{{Speciesbox
| fossil_range = Early [[Devonian]]
| image = Parexus sp.png
| genus = Parexus
| parent_authority = Agassiz, 1845
| species = recurvus
| authority = Agassiz, 1845
| synonyms = *''Parexus falcatus''
*''Farnellia tuberculata'' <small>Traquair</small>
| synonyms_ref = <ref name=Burrowetal>{{Cite journal|author1=Carole J. Burrow |author2=Michael J. Newman |author3=Robert G. Davidson |author4=Jan L. den Blaauwen |year=2013 |title=Redescription of ''Parexus recurvus'', an Early Devonian acanthodian from the Midland Valley of Scotland |journal=Alcheringa: An Australasian Journal of Palaeontology |volume=37 |issue=3 |pages=392–414 |doi=10.1080/03115518.2013.765656 |s2cid=84927480 }}</ref>
}}
'''''Parexus''''' is an extinct genus of [[Acanthodii|acanthodian fish]]. Acanthodians are often referred to as ‘spiny sharks’, although acanthodians are not true sharks and evolved perhaps 50 million years earlier than sharks. Acanthodians share several features with bony fish and cartilaginous fish; they often have spines supporting their fins.
''Parexus'' is recognised by its large anterior dorsal fin spine. Several fossils have been discovered from the Early (Lower) Devonian Period of [[Tillywhandland]], Scotland. Two species were described, ''P. recurvus'' and ''P. falcatus'', both from Scotland; according to Burrow ''et al.'' (2013) ''P. falcatus'' is in fact a [[Synonym (taxonomy)|junior synonym]] of ''P. recurvus''.<ref name=Burrowetal />
==References==
{{Reflist}}
{{Chondrichthyan genera|A.}}
{{Taxonbar|from=Q7136939|from2=Q20719008}}
[[Category:Prehistoric cartilaginous fish genera]]
[[Category:Early Devonian cartilaginous fish]]
[[Category:Devonian cartilaginous fish of Europe]]
[[Category:Devonian Scotland]]
[[Category:Fossils of Scotland]]
{{Acanthodii-stub}}
{{Devonian-fish-stub}}