Slimonia

Slimonia is a genus of Silurian eurypterid roughly similar to the genus Pterygotus. Slimonia resembled Pterygotus, save that the former's telson is larger, and that its body was smaller and more slender than the latter. Unlike Pterygotus, which lived in estuaries, Slimonia species lived exclusively in freshwater environments. Slimonia preyed on smaller fish, such as heterostracans and early osteostracans by seizing and rending them with its large chelicerae. The largest species of Slimonia was extremely long, around two meters. It carried its body on spindly legs and was likely an ambush predator. The lungs of the species were located on the underside of the body in a series of folds.^[1]

Description

Slimonia is distinguishable by its quadrate (roughly square) prosoma, or head, with small compound eyes on the front corners. They had large cordate bodies, with a narrow postabdomen and a telson with a "strongly expanded anterior half." Their chelicerae (claws) were small; their walking legs had denticles, but no spines. Genital appendages were long and narrow in both males and females^[2].

Species

There are three species currently classified under Slimonia:

• Slimonia acuminata Salter, 1856 - Silurian, Herefordshire, England
• Slimona boliviana Kjellesvig-Waering, 1973 - Silurian, Cochambamba, Bolivia
• Slimonia dubia Laurie, 1899 - Silurian, Pentland Hills, Scotland

References