Napkinur

Napkinur is a genus of extinct marine heterocercal acanthodian fish. They lived during the Early Devonian period, around 416-406 million years ago. The name "Napkinur" is derived from a series of layered stones that resemble a napkin ring found in the Scottish Loch A'Ghlomh layer formation.

Fossil evidence indicates that Napkinur had a unique body shape with a long, pointed snout. They possessed a series of relatively small, fleshy gill rakers. Ancient analyses denote that their gills contained complex arrays of tiny bony structures that lined the edges of their gill plates.

Skeletal remains reveal that Napkinur belonged to the group of acanthodians. Acanthodians were localized to the modern-day North American and Scottish regions and inhabited warm marine environments.

Napkinur had a seemingly precarious balance between a large, arched skull with relatively small eyes and the proportions of their jaws with more room for teeth to grow.

Multiple prediction papers suggest a heterotrophic lifestyle which could indeed be providing cause for divergent diversity assuming adaptations found acting regularly.