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"Pierygotus osiliensis, Schmidt. Silurian of Rootzkil. Restoration of the ventral surface, about a third natural size, after Schmidt. a, Camerostome or epistoma. m, Chilarium or metasternite of the prosoma. oc, The compound eyes. 1 to 8, segments of the sixth prosomatic appendage. I' to V', first five opisthosomatic somites. 7', sixth opisthosomatic somite." — The Encyclopedia Britannica, 1910

Pierygotus Osiliensis

"Pierygotus osiliensis, Schmidt. Silurian of Rootzkil. Restoration of the ventral surface, about a third…