Note

Planctoteuthis danae: Description continued

Richard E. Young
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    Figure. Side view of a mature male of P. danae, 92 mm ML, in a shipboard aquarium. Note the thick gelatinous layer over the mantle, tail, head and arm bases. This layer is, presumably, vacuolated and aids buoyancy. Photograph by Karen Osborn.

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

    Figure. Ventral view of P. danae, 47 mm ML. Drawing from Roper and Young (1967).

  1. Arms
    1. Arm lengths: arms I: 38-44% of ML (subadults); arms III: 50-55% of ML (subadults); arms IV: 74-91% of ML (subadults).
    2. Arm I with ca. 40 pairs of suckers; arm II with 45 pairs of suckers; arm III with 35 pairs of suckers; arm IV with 12 suckers on proximal quarter (Joubin, 1931).
    3. Largest arm suckers in small squid with 7-9 small, blunt teeth on distal margin of ring; proximally teeth fuse into a virtually smooth ring.
    4. Lateral arms in holotype with two greatly enlarged (2-3 times larger) suckers; enlarged suckers at position of sucker pairs 15 and 16 on arms II and 18 and 19 on arms III (Joubin, 1931).

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    Figure. Oral views of arm III (top) and arm IV of P. danae, holotype, ca 65 mm ML. Drawings from Joubin (1931).

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    Figure. Side view of arm III of P. danae, holotype, ca. 65 mm ML, showing two suckers with initial enlargement in mid-arm. Photograph by R. Young.

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      Figure. Left - Oral views of large arm suckers of P. danae, 47 mm ML, eastern tropical Pacific Ocean. A-D - Suckers from arms I-IV respectively. Drawings from Roper and Young (1967). Right - Oral view of early stage of enlargement of sucker of a lateral arm, holotype. Drawing from Joubin (1931).

  2. Tentacular clubs
    1. Club of holotype with about 60 suckers (Joubin, 1931).
    2. Club length 12-18% of ML.
    3. "Carpal" suckers on club with broader apertures than regular club suckers.

  3. Viscera
    1. Reproductive structures
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      Figure. Views of the viscera of P. danae. Left - Ventrolateral view of the nearly mature female, 130 mm ML. Photograph by xxxxx. Right - Ventral view of the just mature Male, 92 mm ML. Photograph by Karen Osborn.

Comments

This description is from Roper and Young (1967) unless otherwise indicated. 

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University of Hawaii, Honolulu, HI, USA

Page: Tree of Life Planctoteuthis danae: 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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