Note

Heteroteuthis dagamensis: Description continued

Michael Vecchione, Richard E. Young, and Clyde F. E. Roper
  1. Arms
    1. Arms short, thick. Arm formula: III=>IV>II=>I.
    2. Arms without obvious aboral keels or protective membranes.
    3. All arm suckers globular with smooth inner rings.
    4. Moderately deep web joins arms all arms but arms IV.
    5. Arms I-III with biserial suckers; arms IV with suckers irregularly arranged near tips; more pronounced in males.

  2. Tentacles
    1. Tentacular clubs short, curved without protective membranes.
    2. Tentacular organ present.
    3. Club suckers diminish is size at proximal and distal ends of club.
    4. Suckers number approximately 18-22 across middle of club.
      5. 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 the tentacular club of H. dagamensis 16 mm ML, mature male. Drawing by A. Hart.

  3. Head
    1. Eyes large, about 40-45% of ML.
    2. Secondary ventral eyelid present overlapping cornea.
    3. Short, broad nuchal cartilage protrudes from skin.

  4. Funnel
    1. Funnel component of the funnel/mantle locking-apparatus with elongate, slightly curved groove. Mantle component with strongly curved,  slender ridge that terminates anteriorly in slight depression.
    2. Lateral funnel adductors present; attach to funnel near anterior end of funnel locking-apparatus.
    3. Dorsal pad of funnel organ with inverted V-shape bearing large medial ridge and terminal papilla. Ventral pads large and oval.
    4. Funnel valve present.

  5. Mantle
    1. Ventral shield about 40% of ventral mantle length.
    2. Anterior ventral margin of mantle slightly excavated.
      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

      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. Mantle and shield of H. dagamensis. Top - Ventral view, 16 mm ML, mature male. Drawing by A. Hart. Bottom left - Ventral view, 19 mm ML, male. Bottom right - Side view, 17 mm ML, female. Photographs by R. Young.

  6. Fins
    1. Fins with curved posterior lobes.
    2. Anterior fin attachment about 50% of ML behind middorsal mantle margin.
      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. Dorsal view of H. dagamensis 19 mm ML, male, showing rounded posterior fin lobes. Photograph by R. Young.


  7. Photophores
    1. Large (ca. 35% of ML) visceral photophore present.
      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 H. dagamensis, female, showing photophore and funnel pigmentation. Photograph by R. Young.

  8. Measurements in mm.
    9.   Syntype  Syntype
    		ELTANIN 1816* 
    Sex  female ?  female ?  Male 
    Dorsal mantle length  19  21
    		16 
    Ventral mantle length  21  23
    		19 
    Shield length      7.5 
    Mantle width  18  18
    		11 
    Head width  14  15
    		 
    Fin length  15  17
    		10 
    Fin width      8 
    Length, arm I    12 (left), 12 (right) 7 (left), 9.5 (right) 
               arm II
    		  18.5 (left), 15 (right)
    		9 (left), 10.5 (right) 
               arm III
    		  16.5 (left), 15 (right)
    		13 
               arm IV
    		  17.5 (left), 16.5 (right)
    		14 
    Web depth, sector A      4 
                   sector B     3 
                   sector C     3 
                   sector D      
                   sector E      
    Tentacular club length      3 
    *Illustrated above
About This Page

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

Richard E. Young
University of Hawaii, Honolulu, HI, USA

Clyde F. E. Roper
Smithsonian Institution, Washington, D. C., USA

Correspondence regarding this page should be directed to Clyde F. E. Roper at roper.clyde@si.edu

Page: Tree of Life Heteroteuthis dagamensis: Description continued Authored by Michael Vecchione, Richard E. Young, and Clyde F. E. Roper. 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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