Tactopoda

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Tactopoda
Waterbear.jpg
The tardigrade Hypsibius dujardini
The Childrens Museum of Indianapolis - Atlantic blue crab.jpg
The blue crab Callinectes sapidus, an arthropod
Scientific classification e
Kingdom: Animalia
Subkingdom: Eumetazoa
Clade: Bilateria
Clade: Nephrozoa
(unranked): Protostomia
Superphylum: Ecdysozoa
(unranked): Panarthropoda
(unranked): Tactopoda
Budd, 2001 [1]

Tactopoda is a proposed clade of protostome animals that includes the phyla Tardigrada and Euarthropoda, supported by various morphological observations.[1][2]

The competing hypothesis is Arthropoda (= Euarthropoda + Onychophora)[3]

Classification[edit]

Phylogeny[edit]

Panarthropoda

Velvet worms (Onychophora)

Tactopoda
Tardigrada

Eutardigrada

Heterotardigrada

Mesotardigrada

Arthropoda

Trilobitomorpha/Trilobita

?Pycnogonida

Chelicerata

Xiphosura

Eurypterida

Chasmataspidida

Arachnida

?Pycnogonida

Mandibulata
Myriapoda

Symphyla

Chilopoda

Diplopoda

Pauropoda

Pancrustacea
Oligostraca

Ostracoda

Some of Maxillopoda

Altocrustacea
Multicrustacea

The rest of Maxillopoda

Malacostraca

Allotriocarida
Xenocarida

Remipedia

Cephalocarida

Branchiopoda

Hexapoda
Ellipura

Collembola

Protura

?Diplura

?Diplura

Ectognatha

Insecta

References[edit]

  1. ^ a b Graham E. Budd (2001). "Tardigrades as 'stem-group arthropods': the evidence from the Cambrian fauna" (PDF). Zoologischer Anzeiger. 240 (3–4): 265–279. doi:10.1078/0044-5231-00034. Archived from the original (PDF) on 2016-03-03.
  2. ^ Smith, M. R.; Ortega Hernández, J. (2014). "Hallucigenia’s onychophoran-like claws and the case for Tactopoda". Nature. 514 (7522): 363–366. doi:10.1038/nature13576. PMID 25132546.
  3. ^ J. Ortega-Hernández, “Making sense of ‘lower’ and ‘upper’ stem-group Euarthropoda, with comments on the strict use of the name Arthropoda von Siebold, 1848,” Biol. Rev., vol. 91, no. 1, pp. 255–273, 2016.