Systems of Arachnida

  • Petar Beron
Part of the Monographiae Biologicae book series (MOBI, volume 94)


Heymons (1901), the author of the term Chelicerata, united Merostomata (Eurypterids and Xiphosurans) with Arachnida in one monophyletic group. Dunlop and Selden (1997) restricted this term to Lemoneites, Xiphosura, Chasmataspida, Eurypterida, and Arachnida. There were many attempts to create a “natural” system of the monophyletic (Wheeler et al. 1993) class of Arachnida. Presently, it seems well established that the class Arachnida (Lamarck 1801) is composed of 10 recent orders plus 2–6 orders of “Acari” and variable number of fossil taxa. The seemingly undisputed orders are Palpigradi, Solifugae, Amblypygi, Uropygi, Schizomida, Ricinulei, Scorpiones, Pseudoscorpiones, Opiliones, and Araneae. The Acari have been (and still are) subject of various systems (see Beron 2008, 2011), more often considered as two (Acariformes and Parasitiformes) or three (+ Opilioacarida) orders. In the recent Manual of Acarology, Krantz and Walter and eds. (2009) agree on six orders of “Acari,” Mesostigmata, Holothyrida, Ixodida, Opilioacarida, Sarcoptiformes, and Trombidiformes, grouped in two superorders: Acariformes and Parasitiformes. Some authors (Stockwell 1989, Lourenço 2000) still raise some orders into subclasses or even classes (Opilionida, Scorpionida).


Systems Arachnology Arrangements Orders Suborders Thorell Pocock Millot Shear Kury Quintero Harvey Stockwell Platnick 


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Authors and Affiliations

  • Petar Beron
    • 1
  1. 1.National Museum of Natural History, Bulgarian Academy of SciencesSofiaBulgaria

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