- Arms
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Figure. Somewhat abraided slender, fragile, lightly pigmented arms of G. bonplandi that lack protective membranes. The insert shows an enlarged view of one of the suckers and clearly shows one of the three papillae at the base of the sucker stalk. These papillae are diagnostic of Grimalditeuthis. The right photograph shows a closer view of the arm bases with the beaks and buccal membrane. The latter has a few, scattered chromatophores. Photographs by R. Young.
- Photophores
- Arm tips may be photophores in mature females.Click on an image to view larger version & data in a new window
Figure. Ventral view of the head of a large G. bonplandi (150 mm ML) described by Joubin (1898). The dorsal six arms have dark tips; the insert is an enlargement of one of the arm tips.. The ventral arms have lost their tips. The heavily pigmented region is presumably photogenetic and, if so, the pigment would withdraw when light is emitted. Arm tips bare of suckers are characteristic of immature females but not males. We have examined a mature male and it lacks arm-tip photophores. The sex and state of maturity of the specimen illustrated below from Joubin, 1898 are unknown. Presumably the arm-tip photophores are characteristic of mature or nearly mature females. Painting from Joubin (1898.
Grimalditeuthis bonplandi: Description continued
Richard E. Young and Clyde F. E. RoperReferences
Joubin, L. 1898b. Observations sur divers Céphalopodes. Quatrieme note: Grimalditeuthis richardi. Bulletin de la Societe Zoologique de France, 23:101-113.
Young, R. E. (1991). Chiroteuthid and related paralarvae from Hawaiian waters. Bull. Mar. Sci., 49: 162-185.
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University of Hawaii, Honolulu, HI, USA
Smithsonian Institution, Washington, D. C., USA
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Grimalditeuthis bonplandi: Description continued
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Richard E. Young and Clyde F. E. Roper.
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