Temporal range: Late Silurian
Mixopterus was characterised by a robust exoskeleton with scattered tubercles or semicircular scales. The prosoma (head) was subquadrate, protruding antemedially. The chelicerae (claws in front of the mouth) were small. The first two pairs of walking legs were strongly developed, with long paired spines. The third and fourth walking legs were moderately sized, with short spines. The preabdomen, the front portion of the body, was narrow with axial furrows, while the postabdomen was narrow. The telson was a curved spine.
Three species are currently classified under the genus:
- Mixopterus kiaeri Størmer, 1934 - Ringerike, Norway (Silurian)
- Mixopterus multispinosus (Clarke & Ruedemann, 1912) - New York (Silurian)
- Mixopterus simonsoni Schmidt, 1883 - Saaremaa, Estonia
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