the single known specimen of "eysyslopterus" has been recovered from silurian deposits of the ludlow epoch of the rootsikula formation of saaremaa, estonia. this formation was the habitat of a fauna of eurypterids, among them "erettopterus laticauda", "e. osiliensis", "eurypterus tetragonophthalmus", "mixopterus simonsi" and "strobilopterus laticeps". fossil remains of indeterminate osteostracid and thelodontid fishes have also been found. the habitat in which "eysyslopterus" lived is considered to be a nearshore lagoonal quiet community. the lithology (the physical characteristics of the rocks) of the zone was composed of mudcrack and burrows of dolomite and limestone.