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Lasanius is a genus of basal Anaspida from the Early Silurian, around 443.8 million years ago, known from fossils found near Lesmahagow, Scotland. Specimens range from 13.3 to 74.5 mm in length.
Lasanius has a pair of eyes, and a notochord, and while it has rows of bony scutes running along its back, it lacks the armour typical of other Paleozoic jawless fish like Ostracoderm. There are also structures close to the front of the animal dubbed "chains" and "rods", of unclear function. At the end of the body a Hypocercal tail tail fin was present in the form of a caudal lobe. Historically, it has often been allied with the Anaspida, though other studies found it to be unrelated. A comprehensive redescription published in 2023 found that it was a stem-group Cyclostomi, more closely related to hagfish and lampreys than to jawed fish.
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