Gonatopsis
Richard E. Young, Michael Vecchione, and Tsunemi KuboderaThis tree diagram shows the relationships between several groups of organisms.
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close boxCharacteristics
- Arms
- Hooks in medial two armature series on arms I-III.
- Tentacles
- Tentacles absent in subadult stage.
- Head
- Radula with teeth in 5 or 7 series depending on species.
- Mantle
- Mantle tissue muscular or flabby depending on species.
- Fins
- Fins rhomboid or sagittate in shape depending on species.
- Photophores
- Photophores absent.
Comments
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.
Life History
Tentacles are present in paralarvae but are lost at different early stages depending on the species (Nesis, 1973).
Figure. Ventral view of a paralarva of G. borealis (bottom), 9 mm ML and an oral view of the paralarval tentacular club (top), 7 mm ML, off Southern California, U.S.A. Drawings from Young (1972).References
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.
About This Page
Richard E. Young
Dept of Oceanography
University of Hawaii
Honolulu, Hawaii 96822
USA
National Marine Fisheries Service
Systematics Laboratory
National Museum of Natural History
Washington, D. C. 20560
USA
Tsunemi Kubodera
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).