Tylopterella is a genus of prehistoric eurypterid

Eurypterid

Eurypterids are an extinct group of arthropods related to arachnids which include the largest known arthropods that ever lived. They are members of the extinct order Eurypterida ; which is the most diverse Paleozoic chelicerate order in terms of species...

 which lived from the Ordovician to the Upper Carboniferous period. It is of uncertain taxonomic placement

Incertae sedis

, is a term used to define a taxonomic group where its broader relationships are unknown or undefined. Uncertainty at specific taxonomic levels is attributed by , , and similar terms.-Examples:*The fossil plant Paradinandra suecica could not be assigned to any...

 within the order Eurypterida.

Description

Tylopterella is distinguishable by its small size, and its thick, partly calcareous exoskeleton with curved ridges of confluent tubercules and large knobs near the median line. Its prosoma (head) has a raised margin.

Species

• Tylopterella Størmer, 1851
• Tylopterella boyli (Whiteaves, 1884) — Silurian, USA & Canada
• ?Tylopterella menneri (Novojilov, 1959) — Devonian, Talmyr, Russia