Palaeos		Eurypterida
Arthropoda		Dendrogram

Eurypterida Dendrogram

<==o †EURYPTERIDA (sea scorpions) 
   | ?- †Glyptoscorpius
   |--o †EURYPTERACEA
   |  |--o †Eurypteridae
   |  |  |-- †Eurypterus
   |  |  |-- †Onychopterella
   |  |  `-- †Tylopterella
   |  `--+-- †Adelophthalmidae
   |     |--o †MIXOPTERACEA
   |     |  |--o †Carcinosomatidae
   |     |  |  `-- †Carcinosoma
   |     |  `--+--o †Mixopteridae
   |     |     |  `-- †Mixopterus
   |     |     `--o †Megalograptidae
   |     |        |-- †Megalograptus
   |     |        `-- †Echinognathus
   |     `--o †PTERYGOTINA
   |        |--†Hughmilleriidae
   |        |  |?- †Hastimima
   |        |  |-- †Hughmilleria
   |        |  |-- †Salteropterus
   |        |  |-- †Grossopterus
   |        |  `-- †Lepidoderma
   |        `--+--o †Slimoniidae
   |           |  `-- †Slimonia
   |           `--o †Pterygotidae
   |              `-- †Pterygotus
   `--o †STYLONAURACEA
      |--o †Mycteropidae
      |  `-- †Mycterops
      `--+--o †Rhenopteridae
         |  `-- †Rhenopterus
         `--+--o †Dolichopteridae
            |  |-- †Dolichopterus
            |  `-- †Strobilopterus   |     
            `--o †Stylonuridae (paraphyletic?)
               |-- †Stylonurus
               |-- †Drepanopterus
               |-- †Brachyopterus
               |-- †Ctenopterus
               |-- †Tarsopterella
               |-- †Melbournopterus
               `--o †Hibbertopteridae 
                  |-- †Campylocephalus
                  `-- †Hibbertopterus

This phylogeny was revised to revised to reflect newer, but still unpublished sources -- mostly student papers and abstracts.  We have also made a wild guess about the position of the Hibbertopteridae.  ATW060226.