''Lasanius'' is a genus of
basal
Basal or basilar is a term meaning ''base'', ''bottom'', or ''minimum''.
Science
* Basal (anatomy), an anatomical term of location for features associated with the base of an organism or structure
* Basal (medicine), a minimal level that is nec ...
anaspida
Anaspida ("without shield") is an extinct group of primitive jawless vertebrates that lived primarily during the Silurian period, and became extinct soon after the start of the Devonian. They were classically regarded as the ancestors of lampre ...
from the Early
Silurian
The Silurian ( ) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the shortest period of the Paleozo ...
. Its fossils are around 10 mm to 150 mm in length.
Fossils have been found in Early Silurian-aged strata in
Ayrshire
Ayrshire ( gd, Siorrachd Inbhir Àir, ) is a historic county and registration county in south-west Scotland, located on the shores of the Firth of Clyde. Its principal towns include Ayr, Kilmarnock and Irvine and it borders the counties of Re ...
,
Muirkirk,
Scotland
Scotland (, ) is a country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a border with England to the southeast and is otherwise surrounded by the Atlantic Ocean to the ...
and
Seggholm.
References
R.H. Traquair M.D. LL.D. F.R.S. (1898) IX.—''Notes on Palœozoic fishes.''—No. II, Annals and Magazine of Natural History, 2:7, 67–70,
DOI: 10.1080/00222939808678013
Traquair, R. (1899). XXXII.—Report on Fossil Fishes collected by the Geological Survey of Scotland in the Silurian Rocks of the South of Scotland. ''Transactions of the Royal Society of Edinburgh,'' ''39''(3), 827–864.
doi:10.1017/S0080456800035237
External links
Underwhelming Fossil Fish of the Month: February 2016
Silurian jawless fish
Extinct animals of Europe
Fossil taxa described in 1898
Birkeniiformes genera
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