Arachnomorpha
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Arachnomorpha ("Spider Shapes") Lameere 1890 is a subdivision of Arthropoda, containing the monophyletic group formed by the trilobites and the chelicerates. Great debate is held on the position of the Pycnogonida, which are currently thought not to be placed in the immediate vicinity of the Chelicerata (Dunlop & Arango, 2005).
There is no consensus as to assigning it a formal Linnean category. It could be a subphylum and then its subgroups Chelicerophora and Trilobita should be ranked as infraphyla and the Chelicerata sensu stricto should be a superclass.
The proposal of Lauterbach (1980) to consider the Olenellinae as sister group to the Chelicerata was refuted by Fortey & Whittington (1989), which contraposed many synapomorphies uniting them to the Trilobita instead.
Synonyms include Arachnata Paulus, 1979 and Palaeopoda Packard 1903.
[edit] Classification of the Arachnomorpha
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- ???Pycnogonida Latreille, 1806 (incl. Pantopoda Gerstaecker 1863)
Arachnomorpha Lameere 1890 [= Arachnata Paulus, 1979, = Palaeopoda Packard 1903]
- Trilobita Walch 1771
- Strabopida Hou & Bergström, 1997
- Aglaspida Walcott, 1911
- Cheloniellida Broili, 1932
- Chelicerata Heymons 1901 [= Euchelicerata Weygoldt & Paulus, 1979]
- Class Xiphosura Latreille, 1802
- Class Chasmataspida Caster & Brooks, 1956
- Class Eurypterida Burmeister, 1843
- Class Arachnida Lamarck, 1801
[edit] References
Dunlop, J. A. & Arango, C. P. 2005. Pycnogonid affinities: a review. Journal of Zoological Systematics and Evolutionary Research, 43: 8-21.
Fortey, RA, and HB Whittington. 1989. The Trilobita as a natural group. Historical Biology, 2:125–138.
Lauterbach, K. E. 1980. Schüsselereignisse in der Evolution des Groundplans der Arachnata (Arthropoda). Abhandlungen des Naturwissenschaftlichen Vereins Hamburg (NF), 23:163-327.
