| Lasanius | |
|---|---|
 | |
| Lasanius problematicus | |
 | |
| Life reconstruction ofLasanius problematicus | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | †Anaspida? |
| Family: | †Lasaniidae |
| Genus: | †Lasanius Traquair 1898 |
| Type species | |
| Lasanius problematicus Traquair 1898 | |
| Species | |
| |
Lasanius is a genus ofbasaljawless fish from the EarlySilurian, around 443.8 million years ago, known from fossils found nearLesmahagow,Scotland. Specimens range from 13.3 to 74.5 mm in length.[1]
Lasianus has a pair of eyes, and anotochord, and while it has rows of bony scutes running along its back, it lacks the armour typical of other Paleozoic jawless fish likeostracoderms. There are also structures close to the front of the animal dubbed "chains" and "rods", of unclear function. At the end of the body ahypocercal tail fin was present in the form of a caudal lobe.[1] Historically, it has often been allied with theanaspids, though other studies found it to be unrelated. A comprehensive redescription published in 2023 found that it was a stem-groupcyclostome, more closely related tohagfish andlampreys than tojawed fish.[1]
| ||||||||||||||||||
|  | |||||||||||||||||
 | This article about aprehistoric jawless fish is astub. You can help Wikipedia byexpanding it. |
.png)