Note

Onychoteuthis borealijaponicus: Description continued

Michael Vecchione, Richard E. Young, and Kotaro Tsuchiya
  1. Arms
    1. Arms II-IV subequal; Arms I smallest.
    2. Largest suckers of arms I-III subequal; largest suckers of arms IV smaller (see relative sizes of suckers in drawing at right. A-D = largest suckers of arms I-IV respectively).
    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. Oral view of largest arm suckers of O. borealijaponicus. A-D = suckers of arms I-IV respectively, 81 mm ML, off southern California. Drawing from Young (1972).

  2. Tentacles
    1. Club with 14-16 terminal-pad suckers.
    2. Carpal locking apparatus with 8-11 suckers.
    3. Pigmentation absent proximal to carpus on mid-oral and ventro-oral edge.
    4. Distal ventral-hooks with spike (top drawing below).
    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. Top - Oral view of hook number 9 of ventral hook-series of O. borealijaponicus. Drawing from Young (1972). Bottom - Oral view of preserved tentacular club of O. borealijaponicus, 175 mm ML, immat. female, 45°N, 175°W. Photograph by R. Young.

  3. Gladius
    1. Gladius similar to other members of the genus.
    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. Ventral view of the gladius of O. borealijaponicus with cross-sections, 325 mm GL. Drawing from Toll (1982).

  4. Measurements and counts
  5. Sex Female, immat. Male, immat. Male, immat. Female, immat. Female, immat
    Mantle length 69 73 80 163 175
    Mantle width 15 15 20 34 44
    Fin length 38 43 46 93 98
    Fin width 47 56 64 106 117
    Club length 18 / 18 23 / 23 29 / 29 54 / 53 57 / 60
    Club hooks, number 26 / 24 25 / 26 25 / 25 27 / 26 26 / 26
    Club terminal-pad suckers, number 14 / 14 16 / 14 14 / 15 16 / 15 15 / 16
    Club carpal suckers, number 10 / 10 9 / 8 10 / 10 10 / 11 10 / 9
    Arms I, length 20 / 21 22 / 23 34 / 35 - / - 61 / 61
    Arms II, length 27 / 25 31 / 31 43 / 43 74 / 77 75 / 74
    Arms III, length 25 / 26 31 / 28 42 / 41 73 / 73 71 / 75
    Arms IV, length 25 / 24 32 / 30 44 / 44 77 / 76 77 / 76
    Anterior visceral photophore, length/width 1.5 / 0.9 1.9 / 0.8 1.8 / 1.3 1.9 / 1.5 1.9 / 2.3
    Posterior visceral photophore, length/width 1.9 / 1.0 2.3 / 1.3 2.6 / 1.8 5.1 / 3.2 4.0 / 2.6
    Measurements in mm; right / left

References

Toll, R.B. 1982. The comparative morphology of the gladius in the Order Teuthoidea (Mollusca: Cephalopoda) in relation to systematics and phylogeny. PhD. Dissertation, University of Miami, 390 pp.

Young, R. E. 1972. The systematics and areal distribution of pelagic cephalopods from the seas off Southern California. Smithson. Contr. Zool., 97: 1-159.

About This Page


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


University of Hawaii, Honolulu, HI, USA


Tokyo University of Fisheries, Tokyo, Japan

Correspondence regarding this page should be directed to Kotaro Tsuchiya at

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