Note

Onykia robusta: Club Hooks

Richard E. Young, Michael Vecchione, and Kotaro Tsuchiya

Four club hooks were examined with the scanning electron microscope. Their relative sizes are seen in the photograph below. The ninth hook in the ventral series, counting from the proximal end of the club (abreviated as hook V9) (far right in photograph) was the largest club hook. Its mate from the dorsal hook series (hook D9) is seen on the far left. Between these two are hooks V12 (left of center, smallest of the ventral series hooks examined) and V10 (right of center). Note the near bilateral symmetry of the ventral series hooks.

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Figure. Frontal views of hooks of O. robusta, left to right: D9, V12, V10, V9, 100 cm ML, NMNH #335984 (clubs only). Photographs by R. Young.

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Click on an image to view larger version & data in a new window
  

Figure. Side views of the four hooks, D9 (left bottom), V9 (left top), V12 (right bottom), V10 (right top). Photographs by R. Young.

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Figure. Attachment-site views of hooks V9 (left) and V12 (right). Photographs by R. Young.

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Click on an image to view larger version & data in a new window
  

Figure. Two views of hook D9. Left - top-frontal view. Right - attachment-site view. SEM photographs by R. Young.

Comments

Of the three species of Onykia examined with the SEM, the general appearance of O. robusta is most similar to O. robsoni.

About This Page


University of Hawaii, Honolulu, HI, USA


National Museum of Natural History, Washington, D. C. , USA


Tokyo University of Fisheries, Tokyo, Japan

Page: Tree of Life Onykia robusta: Club Hooks Authored by Richard E. Young, Michael Vecchione, and Kotaro Tsuchiya. The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for reuse. Click on an image or a media link to access the media data window, which provides the relevant licensing information. For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.

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Onykia (Onykia) robusta

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