- Head and buccal crown
- Buccal crown heavily pigmented with pigment not in chromatophores.
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.
- Photophores
- Photophores on head and mantle in two distinct size classes. 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.
- 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.
- 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
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.
- Numerous very small photophores on fins, mantle, funnel, head and arms IV.
- No photophores on eyeballs or viscera.
- 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.
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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.
- Photophores on head and mantle in two distinct size classes.
- Viscera
- Gills (in mature males, at least) with pigmented gills.
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.
- Gills (in mature males, at least) with pigmented gills.
Ancistrocheirus lesueurii: Description continued
Richard E. YoungAbout This Page
University of Hawaii, Honolulu, HI, USA
Correspondence regarding this page should be directed to Richard E. Young at
Page copyright © 2006
Page: Tree of Life
Ancistrocheirus lesueurii: Description continued
Authored by
Richard E. Young.
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