Arachnomorpha

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Arachnomorpha
Temporal range: Cambrian - Recent
Haeckel Arachnida.jpg
"Arachnida" from Ernst Haeckel's Kunstformen der Natur, 1904
Scientific classification e
Kingdom: Animalia
Phylum: Arthropoda
Clade: Arachnomorpha
Lameere, 1890
Subgroups
Synonyms
  • Arachnata Paulus, 1979
  • Palaeopoda Packard, 1903

Arachnomorpha is a proposed subdivision or clade of Arthropoda, comprising the group formed by the trilobites and their close relatives (Artiopoda), Megacheira (which may be paraphyletic) and chelicerates. Under this proposed classification scheme, Arachnomorpha is considered the sister group to Mandibulata (including insects, crustaceans and myriapods).[1]

The arachnomorph concept has been challenged by suggestions that the artiopods are more closely related to mandibulates, forming the clade Antennulata instead.[2][1]

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

Classification[edit]

Arachnomorpha Lameere, 1890 [= Arachnata Paulus, 1979, = Palaeopoda Packard, 1903]

Phylogeny[edit]

Using fossil data, Bergström & Hou (2003) gave an outline of arthropod relationships emphasizing trilobitomorphs (a group that includes trilobites and trilobite-like animals).[3]

Arthropods
Arachnomorpha
Limulavida

Sidneyia

Aglaspidida

Chelicerates

Cheloniellon

Trilobitomorpha (s.s.)
Marrellomorpha
Acercostraca

Vachonisia

Marellida

Mimetaster

Marrella

Emeraldellida

Emeraldella

Retifaciida

Retifacies

Core trilobitomorphs
Concilioterga
 Order Helmetiida

Helmetia

Kuamaia

Sapenion

Tegopelte

Nectopleura (e.g. Nektaspida)

Naraoia

Petalopleura
 Order Xandarellida

Cindarella

Xandarella

Phytophilaspis

Trilobites, subclass Trilobita

Hexapoda

Crustaceans

Yohoia

Canadaspis

Fuxianhuia

References[edit]

  1. ^ a b Aria, Cédric (2022-04-26). "The origin and early evolution of arthropods". Biological Reviews: brv.12864. doi:10.1111/brv.12864. ISSN 1464-7931.
  2. ^ Gerhard Scholtz & Gregory Edgecombe (2005). "Heads, Hox and the phylogenetic position of trilobites". Crustacea and Arthropod Relationships. CRC Press. pp. 139–165. CiteSeerX 10.1.1.130.2585.
  3. ^ Bergström, J. & Hou, X. G. (2003). "Arthropod origins" (PDF). Bulletin of Geosciences. 78 (4): 323–334. Archived from the original (PDF) on 2016-03-04. Retrieved 2014-03-03.