Tactopoda

Tactopoda or Arthropodoidea is a proposed clade of ecdysozoan animals that includes the phyla Tardigrada and Euarthropoda, supported by various morphological observations.^[1][2][3] The cladogram below shows the relationships implied by this hypothesis.

Subkingdom:Eumetazoa

Clade:ParaHoxozoa

Clade:Bilateria

Clade:Nephrozoa

Quick facts Scientific classification ...

Tactopoda Temporal range: Fortunian–Present PreꞒ Ꞓ O S D C P T J K Pg N
The tardigrade Hypsibius dujardini
The blue crab Callinectes sapidus, an arthropod
Scientific classification
Kingdom:	Animalia
Subkingdom:	Eumetazoa
Clade:	ParaHoxozoa
Clade:	Bilateria
Clade:	Nephrozoa
Clade:	Protostomia
Superphylum:	Ecdysozoa
Clade:	Panarthropoda
(unranked):	Tactopoda Budd, 2001[1]

Close

The competing hypothesis is that Antennopoda^[4][5] (= Euarthropoda + Onychophora, the arthropods and the velvet worms) is monophyletic,^[6] and tardigrades lie outside this grouping.

Anatomic arguments for the tactopoda monophyly include similarities in the anatomies of head, legs, and muscles between the arthropods and the tardigrades. Anatomic arguments against it include that tardigrades lack the kind of circulatory system (including a dorsal heart) which the arthropods and the velvet worms share. Graham Budd argued that the lack of this system in recent tardigrades is due to their miniature size, which makes a complex circulatory system superfluous; thus, the loss of this feature would be a secondary property, acquired as the tardigrade stem group turned smaller, and both the Euarthropoda+Onychophora circulatory system and a relatively large size should be a feature of the last common ancestor of all three groups.^[1] However, Gregory Edgecombe also invoked phylogenomic evidence in favour of the alternative Euarthropoda+Onychophora grouping.^[6]