Traditionally, pycnogonids were classified as the most primitive chelicerates and their relationships with other chelicerate taxa had been considered to be problematical at best. Recent research has demonstrated that pycnogonids are closely related to mites and ticks and they are now considered to be an order of Arachnids, Order Pycnogonida (Bain, in press). Within the pycnogonida, there are currently a number of different classification schemes, most with seven to nine different families. The most commonly used classification schemes are those of Stock (1994) and Hedgpeth (1947, 1982) each with eight families. Arnaud and Bamber (1987), a recent summary of pycnogonid biology, use a combination of these two classification schemes. There are currently 86 pycnogonid genera and at least a thousand species (Bain, 1992). There is no recent published species catalog for the group.
A Comparison of Current Pycnogonid Classifications
(modified from Bain, in press)
|Hedgpeth (1947, 1982); King (1973)||Stock (1994)||Arnaud & Bamber (1987)|
1 Pallene is a preoccupied genus name (Flynn 1929, p. 252). Most species of Pallene
have been changed to Callipallene and the family name changed to
2 Includes the genus Endeis
3 Includes the family Tanystylidae
4 Contains only the genus Austrodecus
5 Contains both Austrodecus and Pantopipetta
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