Magnoteuthis magna: Original description

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

Figure. Ventral view of Mg. magna, holotype,160 mm ML. Drawing from Joubin (1920).

This description is from the english translation of Joubin's 1920 paper rather than the 1913 paper which was the original description. Presumably this description of the holotype is virtually the same as the earlier version.

1. Arms
   1. Arm suckers with smooth inner rings.
      
      

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

      

   Figure. Side and oral views of arms suckers of Mg. magna, holotype. Drawing from Joubin(1920).

   

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

   
   

   Figure. Ventral view of the brachial crown of Mg. magna, holotype, showing the how sucker size varies along the lengths of the arms. Drawing from Joubin (1920).

   2. Arm IV with 55+ pairs of suckers; arm III with 56 pairs; arm II with 60+ pairs, arm I with 68 pairs.
   3. Arm suckers increase in size from base to sucker pair 12 or 13; next 15 pairs same size, then size diminishes to tip.
      
      
2. Tentacles
   1. Club length 80% of tentacle length.
   2. Proximally suckers in narrow band that gradually broadens; at mid-club suckers cover 3/4 of tentacle circumference.
   3. Club suckers minute with smooth inner rings.
   

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

   

   Figure. Side view of a club sucker of Mg. magna, holotype. Drawing from Joubin (1920).

   

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

   
   

   Figure. Proximal region of the tentacular club of Mg. magna, holotype. Note the slender, tapering base of the club. Drawing from Joubin (1920).

3. Funnel
   1. Mantle component of the funnel locking-apparatus a "rectilinear ridge narrow anteriorly and slightly wider posteriorly".
   2. Funnel component an "auricular-like groove". 
      
   

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

   

   Figure. Ventral view of the funnel component of the funnel locking-apparatus of Mg. magna, holotype . Drawing from Joubin (1920).

4. Mantle
   1. Skin tubercules absent from mantle and elsewhere.
      
      
5. Fins
1. Fin length (without tail) 66% of ML.
2. Fin width 79% of ML (without tail); assumming (and including) a 20 mm tail the FW becomes 71% of ML
3. Fin width 120% of fin length (without tail).
   
   
6. Measurements

   Source	Joubin, 1920
   Sex	Unknown
   Mantle length	160
   Mantle width	54
   Head length	42
   Head width	43
   Fin length	105 (without tail)
   Fin width	127
   Arm I, length	80
   Arm II, length	105
   Arm III, length	82
   Arm IV, length	172
   Arm I, sucker no.	135
   Arm II, sucker no.	120+
   Arm III, sucker no.	112
   Arm IV, sucker no.	109
   Tentacle length	480
   Club length	390

Comments

This description is taken from Joubin (1920).

References

Joubin, L. 1920. Céphalopodes provenant des Campagnes de la Princesse Alice (1898-1910). 3e Serie. Monaco.