Note

Ancistrocheirus lesueurii: Description continued

Richard E. Young
  1. Head and buccal crown
    1. Buccal crown heavily pigmented with pigment not in chromatophores.
    2. 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.  Oral view of buccal and base of brachial crowns of A. lesueurii, mature male, 60 mm ML, Hawaiian waters. Note the 8 buccal supports and the dorsal attachment to arms IV of the buccal connectives (black arrow). Note the hooks on the left arm III (red arrow) and the photophores attached to the outer surface of the left tentacle (blue arrow). Photograph by R. Young.

  2. Photophores
    1. Photophores on head and mantle in two distinct size classes.
      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. Ventral view of the anterior mantle of A. lesueurii showing large photophores (black arrows) and small photophores (magnification insert). Photographs by R. Young.

    2. Generally 22 large photophores on ventral surface of mantle arranged in fixed pattern of twos and fours as follows: 4+2+4+2+4+2+4.
    3. Large photophores on head, funnel, base of arms II and tentacular stalk.
      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 view of the distal tentacle and club of A. lesueurii showing the large, weakly attached spherical photophores on the aboral surface of the tentacle. Photograph by R. Young.

    4. Numerous very small photophores on fins, mantle, funnel, head and arms IV.
    5. No photophores on eyeballs or viscera.
    6. Additional photophores present in mature squid: Mature males with large, lidded, elongate photophores on aboral tips of arms IV; mature females with apparent photophores on tips of dorsal six arms.
    7. 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. Arm-tip photophores of mature A. lesueurii. Left - Arm IV tips of a mature male, 60 ML, from Hawaiian waters, fresh. The yellow-green color of the photophore is the true color; the white color of the photophore on the right results from overexposure of the photograph. Right - Oral view of the tip of left arm II from a mature female, 180 mm ML, from Hawaiian waters, preserved. Arm tips of the dorsal six arms of the mature female have bare, dark swellings that are probably photophores. Photographs by R. Young.

  3. Viscera
    1. Gills (in mature males, at least) with pigmented gills.
    2. 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. Ventrolateral view of the mantle cavity of a mature male A. lesueurii, 60 mm ML. Hawaiian waters, showing the distribution of pigment. Note the brown pigmented tip of the translucent-white penis and the large size of the spermatophores. Note also the black intestine that has torn loose from the ink sac and the lobes of the sperm duct lying free in the mantle cavity. Also note the pigmentation of the blood vessels of the gill. Photograph by R. Young.

About This Page


University of Hawaii, Honolulu, HI, USA

Correspondence regarding this page should be directed to Richard E. Young at

Page: Tree of Life Ancistrocheirus lesueurii: Description continued Authored by 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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