tetragonophthalmus (Fischer, 1839), from above From the 47th plate from Ernst Haeckel's Kunstformen der Natur (1904). https://creativecommons.org/publicdomain/mark/1

Mark 1.0falsefalse English Ernst Haeckel Kunstformen der Natur Aspidonia Limulidae (Horseshoe Crab) Trilobite Eurypterid (Sea Scorpion) 1904 Illustrated