Lasanius

Lasanius is a genus of basal agnathan (jawless) anapsid fish from the Early Silurian. Its fossils are around 10 mm to 150 mm in length.

Life reconstruction of Lasanius problematicus

Lasanius
Temporal range: Late Silurian
Lasanius problematicus
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Subphylum:
Vertebrata
Class:
†Anaspida
Order:
†Birkeniiformes
Family:
†Lasaniidae
Genus:
†Lasanius

Traquair 1898
Type species
Lasanius problematicus
Traquair 1898
Species
  • L. altus Smith 1958
  • L. armatus Traquair 1899
  • L. problematicus Traquair 1898

Fossils have been found in Early Silurian-aged strata in Ayrshire, Muirkirk, Scotland and Seggholm.

A comprehensive redescription published in 2023 found that it was a stem-group cyclostome, related to hagfish and lampreys.[1]

References
  1. Reeves, Jane C.; Wogelius, Roy A.; Keating, Joseph N.; Sansom, Robert S. (March 2023). Cavin, Lionel (ed.). "Lasanius , an exceptionally preserved Silurian jawless fish from Scotland". Palaeontology. 66 (2): e12643. Bibcode:2023Palgy..6612643R. doi:10.1111/pala.12643. ISSN 0031-0239.

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



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