Note

Echinoteuthis atlantica: Description of beaks

Michael Vecchione and Richard E. Young

LOWER BEAK

We examined beaks of E. atlantica from two individuals (101, 105 mm ML). The following characters are taken from Clarke (1986). Arithmetic means from the two squid are used for characters requiring measurements.

  1. Pigmentation - Normal.
  2. Pigmentation pattern - See photographs.
  3. (Wing length)/(visible rostral edge) (profile) - 1.7
  4. Height/baseline (profile) - 1.13
  5. (Length from rostral tip to wing tip projected on baseline)/baseline (profile) - 0.21
  6. (Hood length)/(crest length) (profile) - 0.62
  7. (Crest length)/baseline (profile) - 0.65
  8. (Rostral base)/(visible rostral edge) (profile) - 0.98
  9. (Hood length)/(visible rostral edge) (profile) - 0.82
  10. Rostral width ratio [LRL/(length between jaw angles)] - 2.78
  11. Visible rostral angle (profile) - Obtuse
  12. - 30. As in E. famelica
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. Left and right side views of the same lower beak of E. atlantica, 105 mm ML, 4.7 mm LRL, immature male, 34°N, 35°W (North Atlantic). Photographs 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. Left and right side views of the same lower beak of E. atlantica, 101 mm ML, 4.1 mm LRL, immature female, 34°N, 35°W (North Atlantic). Photographs 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. Left and right side-oblique views of the same lower beak of E. atlantica, 105 mm ML, immature male, 34°N, 35°W (North Atlantic). Photographs 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. Front (left) and rear (right) views of the same lower beak of E. atlantica, 105 mm ML, immature male, 34°N, 35°W (North Atlantic). Photographs 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 view of the lower beak of E. atlantica, 105 mm ML, immature male, 34°N, 35°W (North Atlantic). 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. Two slightly different oblique rear-views of the same lower beak of E. atlantica, 105 mm ML, immature male, 34°N, 35°W (North Atlantic) showing the width of the lateral wall ridge (arrow). Photographs by R. Young.

Comments

E. atlantica lower beaks are very similar to those of E. famelica and the few beaks we have examined are insufficient to determine if they can be separated. To distinguish E. atlantica (and E. famelica) from other slender-beaked mastigoteuthids (ie, Mastigopsis. hjorti and Mastigotragus pyrodes) the page on E. famelica beaks. 

UPPER BEAK

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. Side views of the upper beak of E. atlantica. Left - 101 mm ML, immature female, 34°N, 35°W. Right - 105 mm ML, immature male, 34°N, 35°W. Photographs 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 the upper beak of E. atlantica, 105 mm ML, immature male, 34°N, 35°W. Left - Frontal view. Middle - Top view. Right - Bottom view. Photographs by R. Young.

Comments

To be added. 

About This Page


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


University of Hawaii, Honolulu, HI, USA

Page: Tree of Life Echinoteuthis atlantica: Description of beaks Authored by Michael Vecchione and Richard E. Young. 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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