Eurypterus 
Permic 
ee ees ce ee ee eee ee se ee ee ee eee eee eee eee ee ee ee ee ee ew ee eee ww eM HK 
Anthraconectes 
Stylonurus 
Carbonic 
— ae eee ee ee ee eee ee oe een mee ee ee ee eee eee eee eee ee ee meee ee ee ee ew fe we ew we eM eM wee ow 
Devonic Pterygotus 
Eusarcus 
Dolichopterus 
ee meee ewe ewe ee eee eee eee ew 
Erettopterus 
Hughmilleria 
Slimonia 
Onychopterus 
Siluric 
Lower Mo 7 Ed 
® e ‘ y ‘ “ 
Siluric. it ' if 
VI $f 
\ is 17 
Champlaini ‘SY it Ve 
( plainic) ~~ F y 
‘ i a 
nT (a . a 
oe { a 
‘SL Le 
Cambriec _ | Strabops 
‘ 
1 
Protbiype 
eee” 
Pterygotidae Eurypteridae 
Diagram of the phylogeny and geological distribution of the genera of eurypterids 
