This tree diagram shows the relationships between several groups of organisms.
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The family Amphitretidae contains three subfamilies of mesopelagic octopods that are weakly muscled (gelatinous) and have uniserial suckers on the arms.
Octopodoidea with ...
- uniserial suckers.
- gelatinous construction.
- eyes that are not hemispherical.
- Arm suckers uniserial; arrangement sometimes irregular at arm tips.
- Shape variable but not hemispherical.
- Muscles reduced; octopod with gelatinous consistency.
The following table compares the subfamilies.
Discussion of Phylogenetic Relationships
The concept of the family Amphitretidae has recently been revised (Strugnell, et al., 2013) and now includes three former families (Bolitaenidae, Amphitretidae and Vitreledonelidae) that previously were not always all considered closely related. The presence of a ctenoglossan radula in the Bolitaeninae and Amphitretinae has long supported the close relationship of these two taxa (e.g. Naef, 1921-3) and the new DNA data convincingly shows a monophyletic relationship between the Bolitaenidae and Vitreledonellidae (Strugnell, et al., 2013; this study lacked specimens of Amphitretus).
Strugnell, J. M., M. D. Norman, M. Vecchione, M. Guzik and A. L. Allcock. 2013. The ink sac clouds octopod evolutionary history. Hydrobiologia (online, 28 May), 21 pp.
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- First online 07 July 2013
- Content changed 31 October 2018
Citing this page:
Tree of Life Web Project. 2018. Amphitretidae. Version 31 October 2018 (under construction). http://tolweb.org/Amphitretidae/149568/2018.10.31 in The Tree of Life Web Project, http://tolweb.org/