Arachnomorpha

 ( Arthropod Taxonomy ) 

Arachnomorpha is a proposed subdivision or clade of , comprising the group formed by the Trilobita and their close relatives (Artiopoda), Megacheira (which may be paraphyletic) and Chelicerata. Under this proposed classification scheme, Arachnomorpha is considered the sister group to Mandibulata (including insects, Crustacean and myriapods).

The arachnomorph concept has been challenged by suggestions that the artiopods are more closely related to mandibulata, forming the clade Antennulata instead.

There is no consensus as to assigning Arachnomorpha a formal Linnean rank.

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Classification Arachnomorpha Lameere, 1890 =

• † Nettapezoura
• † Dicranocaris
• †Trilobita Walch, 1771
• †Megacheira Hou & Bergstrom, 1997
• †Strabopida Hou & Bergström, 1997
• †Aglaspida Walcott, 1911
• †Cheloniellida Broili, 1932
• Chelicerata Heymons 1901
• Family †Sanctacarididae Legg & Pates, 2017
• Class Pycnogonida Latreille, 1810
• Clade Euchelicerata Weygoldt & Paulus, 1979
• Family †Offacolidae Sutton et al., 2002
• Clade Prosomapoda Lamsdell, 2013

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Phylogeny Using fossil data, Bergström & Hou (2003) gave an outline of arthropod relationships emphasizing trilobitomorphs (a group that includes trilobites and trilobite-like animals).

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