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Petrunkevitch, A. I.
1949.
A study of Palaeozoic Arachnida. Transactions of the Connecticut Academy of Arts and Sciences, 37, 69-315.
Comments:
Petrunkevitch's scheme was based primarily on whether the prosoma-opisthosoma junction was broad (Latigastra), narrow (Caulogastra) or variable (Soluta) and the orientation of the chelicerae which hang down in one subclass (Stethostomata). He did not propose relationships between the orders. This scheme is significant as the fossil order Trigonotarbida makes its first appearance here, but its subclass Soluta can be criticised for being defined on what he believed to be a variable character (in fact it is restricted in all trigonotarbids).
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Class ARACHNIDA
Subclass LATIGASTRA
Order SCORPIONES
Order PSEUDOSCORPIONES
Order OPILIONES
Order ARCHITARBI (=Phalangiotarbida)
Order ACARI
Subclass STETHOSTOMATA
Order HAPTOPODA
Order ANTHRACOMARTI
Subclass SOLUTA
Order TRIGONOTARBI
Subclass CAULOGASTRA
Branch LATISTERNA
Order PALPIGRADI
Branch CAMAROSTOMATA
Order THELYPHONIDA
Order KUSTARACHNAE (=opilionids)
Branch LABELLATA
Order PHRYNCHNIDIA (=Amblypygi)
Order ARANEAE
Branch CUCULLIFERA
Order RICINULEI
Branch ROSTRATA
Order SOLIFUGAE
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