Jamoytius kerwoodi

Jamoytius kerwoodi


fossil_range = Silurian
regnum = Animalia
phylum = Chordata
classis = Hyperoartia or Anaspida
genus = "Jamoytius"
species = "Jamoytius kerwoodi"
species_authority=White 1946cite journal
author = White, E.I.
year = 1946
title = "Jamoytius kerwoodi", a new chordate from the Silurian of Lanarkshire [Scotland]
journal = Geological Magazine
volume = 83
issue = 2
pages = 89–97
url = http://geolmag.geoscienceworld.org/cgi/content/abstract/83/2/89
accessdate = 2007-10-31

"Jamoytius kerwoodi" was a species of primitive, eel-like jawless fish that lived in the Silurian period.

"J. kerwoodi" is the earliest known anaspid. [ [http://www.btinternet.com/~vendian/FOSSILWEB/new_page_4.htm New Page 4 ] ] . It had long, paired fins running along its body - making it a good swimmer. "J. kerwoodi" resembled a lamprey, especially with its rounded mouth and elongated body. However, as it had no teeth or teeth-like structures in its mouth, it was not carnivorous like its distant modern-day relative, the lamprey. It was more likely to have been a filter-feeder or a detrius-feeder, possibly in the manner of larval lampreys.

The fish had a cartilaginous skeleton, and a branchial basket resembling the cyclostomes - used to suggest that it was a near-ancestor to that clade. It is also the earliest known vertebrate with camera-type eyes.cite journal
author = Ritchie, A.
year = 1968
title = New evidence on Jamoytius kerwoodi White, an important ostracoderm from the Silurian of Lanarkshire, Scotland
journal = Palaeontology
volume = 11
pages = 21–39
accessdate = 2007-10-31
] It also possessed weakly mineralised scales.cite journal
author = Today, G.
year = 2003
title = Fossils explained 43: Anaspid fishes
journal = Geology Today
volume = 19
issue = 3
pages = 111–113
doi = 10.1046/j.1365-2451.2003.00413.x

Further reading

Long, John A. The Rise of Fishes: 500 Million Years of Evolution Baltimore: The Johns Hopkins University Press, 1996. ISBN 0-8018-5438-5

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