# Janaspis

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> Source: https://en.wikipedia.org/wiki/Janaspis
> Source revision: 1334989327
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{{Short description|Extinct genus of jawless fishes}}
{{Automatic_taxobox
| fossil_range = {{Fossil range|Early Devonian}}
| image = Janaspis.jpg
| image_caption = Headshield reconstruction
| taxon = Janaspis
| authority = 
| type_species = ''Janaspis pagei''
| type_species_authority =
| subdivision_ranks = Species
| subdivision = 
*''Janaspis pagei''
*''Janaspis punctata''
*''Janaspis newtonensis''
}}

'''''Janaspis''''' is an extinct genus of [osteostracan](/source/Osteostraci), that lived in the early [Devonian](/source/Devonian) period in Britain. It is characterised by a number of features of its armoured headshield, including the presence of raised rims around its eyes, the shape of its lateral and median fields (depressed areas of the headshield covered by small loose plates, which are common to most Osteostraci), its prominent dorsal spine, fairly long cornual processes (backwards pointing spines on each side of the headshield) and ornamentation. ''Janaspis'' was fairly small compared with other osteostracans, with a headshield measuring less than 60mm.<ref name=KeatingetalJVP2012>{{cite journal |author=Joseph N. Keating, Robert S. Sansom and Mark A. Purnell |year=2012 |title=A new osteostracan fauna from the Devonian of the Welsh Borderlands and observations on the taxonomy and growth of Osteostraci |journal=Journal of Vertebrate Paleontology |volume=32 |issue=5 |pages=1002–1017 |doi=10.1080/02724634.2012.693555 |s2cid=32317622 |url=https://pure.manchester.ac.uk/ws/files/21742113/POST-PEER-REVIEW-NON-PUBLISHERS.PDF }}</ref>

==References==
{{Portal|Paleontology}}
{{Reflist}}

{{Osteostraci}}
{{Taxonbar|from=Q19597617}}

Category:Osteostraci genera
Category:Early Devonian fish of Europe

{{Devonian-jawless-fish-stub}}

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Adapted from the Wikipedia article [Janaspis](https://en.wikipedia.org/wiki/Janaspis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Janaspis?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.