GonatopsisRichard E. Young, Michael Vecchione, and Tsunemi Kubodera
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The root of the current tree connects the organisms featured in this tree to their containing group and the rest of the Tree of Life. The basal branching point in the tree represents the ancestor of the other groups in the tree. This ancestor diversified over time into several descendent subgroups, which are represented as internal nodes and terminal taxa to the right.
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- Hooks in medial two armature series on arms I-III.
- Tentacles absent in subadult stage.
- Radula with teeth in 5 or 7 series depending on species.
- Mantle tissue muscular or flabby depending on species.
- Fins rhomboid or sagittate in shape depending on species.
- Photophores absent.
Gonatopsis is divided into two subgeneraa on the basis of the radular structure. G. (Gonatopsis) octopedatus and G. (Gonatopsis) japonicus have a five-tooth radula while G. (Boreoteuthis) borealis has a seven-tooth radula.
Tentacles are present in paralarvae but are lost at different early stages depending on the species (Nesis, 1973).
Young, R.E. 1972. The Systematics and Areal Distribution of Pelagic Cephalopods from the Seas off Southern California. Smithsonian Contributions to Zoology, 97:159 pages.
Richard E. Young
Dept of Oceanography
University of Hawaii
Honolulu, Hawaii 96822
National Marine Fisheries Service
National Museum of Natural History
Washington, D. C. 20560
National Science Museum, Tokyo, Department of Zoology 3-23-1 Hyakunin-cho, Shinjuku-ku, Tokyo, 169 JAPAN
Page copyright © 2005 Richard E. Young, , and
- First online 25 October 2004
Citing this page:
Young, Richard E., Vecchione, Michael, and Kubodera, Tsunemi. 2004. Gonatopsis http://tolweb.org/Gonatopsis/19764/2004.10.25 in The Tree of Life Web Project, http://tolweb.org/. Version 25 October 2004 (under construction).