Note

Onychoteuthis compacta: Description Continued

Richard E. Young, Michael Vecchione, and Kotaro Tsuchiya
  1. Tentacles
    1. Only distal suckers are those of the terminal pad.
    2. Terminal pad with 13-16 suckers.
    3. Pigmentation absent proximal to carpal locking apparatus in midoral and ventro-oral regions of stalk.
    4. Carpal locking-apparatus with 8-9 suckers.
    5. Club with 21-22 hooks.
      6. 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 tentacular club of O. compacta, preserved, Hawaiian watera. Photograph by R. Young.

  2. Mantle
    1. Posteroventral mantle with well-developod keel (photograph far right).
    2. Chromatophores absent in a large patch between fins.
      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. Oblique-ventral view of the posterior mantle of O. compacta, preserved, Hawaiian waters. This photograph is an enlargement of one shown on the main page for this species. This close-up shows more clearly that chromatophores are absent in this large patch on the mantle. Photograph by R. Young.

  3. Photophores
    1. Visceral photophores prominent.
    2. Posterior visceral photophore round, width ave. 92% of length (range 82-100%)
      3. 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 visceral photophores of O. compacta, preserved, Hawaiian waters. Photograph by R. Young.

  4. Measurements and counts
    5. Sex Male, immat. Female, immat. Female, immat. Male, mature
    Mantle length 67 88 122 127
    Mantle width 18 23 28 25
    Fin length 38 51 70 68
    Fin width 60 67 86 72
    Club length 18 / 18 21 / 21 31 / 31 27 / 28
    Club hooks, number 22 / 22 22 / 22 21 / 22 22 / 21
    Club terminal-pad suckers, number 13 / 15 16 / 14 13 / 13 13 / 15
    Club carpal suckers, number 9 / 9
    		8 / 8 9 / 8
    Arms I, length 24 / 26 28 / 28 41 / 42 41 / 42
    Arms II, length 33 / 32 38 / 35 53 / 55 60 / 53
    Arms III, length 34 / 33 35 / 37 57 / 57 58 / 57
    Arms IV, length 33 / 33 37 / 37 54 / 52 54 / 53
    Anterior visceral photophore, length/width 1.9 / 1.8 2.3 / 1.5 2.6 / 2.3 2.0 / 1.4
    Posterior visceral photophore, length/width 2.7 / 2.7 3.2 / 2.8 5.1 / 4.2 4.4 / 4.4
    Measurements in mm; right / left
About This Page


University of Hawaii, Honolulu, HI, USA


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


Tokyo University of Fisheries, Tokyo, Japan

Page: Tree of Life Onychoteuthis compacta: Description Continued Authored by Richard E. Young, Michael Vecchione, and Kotaro Tsuchiya. 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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