Arachnomorpha
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| "Arachnida" from Ernst Haeckel's Kunstformen der Natur, 1904 | |
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Arachnomorpha
Lameere, 1890
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Arachnomorpha is a subdivision or clade of Arthropoda, comprising the monophyletic group formed by the trilobites, other great appendage arthropods and trilobite-like families (Helmetiidae, Xandarellidae, Naraoiidae, Liwiidae, and Tegopeltidae), and a diverse sister clade including the chelicerates.[1][2] 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.[3] Arachnomorpha are considered the sister group to the crustaceans, which are increasingly being accepted as members of the mandibulate clade (including insects and myriapods).[2]
The arachnomorph concept has been challenged by suggestions that the trilobites fall in the mandibulata stem-group.[4]
There is no consensus as to assigning Arachnomorpha a formal Linnean rank.
A proposal, which contraposed many synapomorphies uniting them to the Trilobita instead.[5] to consider the Olenellinae as sister group to the Chelicerata has been refuted.[6]
Classification
- ?Pycnogonida Latreille, 1806 (incl. Pantopoda Gerstaecker, 1863)
Arachnomorpha Lameere, 1890 [= Arachnata Paulus, 1979, = Palaeopoda Packard, 1903]
- Trilobita Walch, 1771
- Megacheira Hou & Bergstrom, 1997
- 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
Phylogeny
Using fossil data, Bergström & Hou (2003) gave an outline of arthropod relationships emphasizing trilobitomorphs (a group that includes trilobites and trilobite-like animals).[7]
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References
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