Note

Ancistroteuthis lichtensteinii: Club Hooks

Richard E. Young, Michael Vecchione, and Kotaro Tsuchiya

Three hooks of A. lichtensteini type B, were examined with a scanning electron microscope (SEM). Their relative sizes are seen in the photograph below. The 6th hook from the proximal end of the club in the ventral series (ie, hook V6) was the largest hook of all the club hooks. The hook situated two hooks more distally (hook V8) was also examined as was the hook from the dorsal series (hook D5) that lies opposite but slightly proximal to hook V6. Proceeding from left to right the hooks are D5, V8 and V6. Note the presence of a distinct "hairlip" on the hooks of the ventral series and the large size difference between hooks V6 and D5.

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

Figure. Frontal views of the three hooks (D5, left; V8, middle; V6,right) of A. lichtensteini examined, 157 mm ML, 05°30'S, 16°28'W. SEM photograph by R. Young.

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

Figure. Top-frontal views of the two hooks of the ventral series. Left is the largest hook (V6) and right is hook V8. The lateral claw-grooves on the hook extend nearly to the hook tip. They do not join near the hook tip. The medial lateral lobe of V6 is greatly reduced and nearly absent in V8. SEM photograph by R. Young.

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

Figure. Oblique-side views of the two ventral-series hooks. Top - Hook V6. Bottom - Hook V8. SEM photograph by R. Young.

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

Figure. Oblique views of the attachment areas. Left - Hook V6. Right - Hook V8. The hairlip appears less accentuated in hook V8. SEM photograph by R. Young.

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

Figure. Various views of hook D5. Top, left - Top-frontal view. Top, right - Side-oblique view. Bottom - Attachment-site view. The lateral claw-grooves do not meet (same as the ventral series hooks). The hook is bilaterally symmetrical as is typical of onychoteuthid dorsal-series hooks. SEM photograph by R. Young.

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 Ancistroteuthis lichtensteinii: 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.

close box

This page is a note that is attached to a leaf of the Tree of Life.

ToL notes provide brief accounts of characteristics, short summaries, commentaries, media files, taxonomic information, or identification tools for a given group of organisms.

For a more detailed explanation of the different ToL page types, have a look at the Structure of the Tree of Life page.

close box

Ancistroteuthis lichtensteinii

Page Content

articles & notes

collections

people

Explore Other Groups

random page

  go to the Tree of Life home page
top