Magnapinna atlantica: Description of paratype

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Figure. Dorsal (left) and ventral (right) views of M. atlantica, paratype, immature male, 53 mm ML. A glass slide is placed over the fins to hold them flat. The ridges on the fins is an artifact resulting from shipment of the squid. Photographs by R. Young.

1. Arms
   1. Arm suckers in two series.
   2. Inner rings of arm suckers with smooth rings.
   

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   Figure. Side view of a portion of arm IV of M. atlantica, paratype, showing suckers with smooth sucker rings. Photograph by R. Young.

2. Tentacles
   1. Tentacle bases approximately the same thickness as adjacent arms.
      
   

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   Figure. Ventral view of the brachial crown of M. atlantica, paratype showing relative thickness of arms and tentacles. Photograph by R. Young.

   

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   FigureM. Oral views of the tentacles of M. atlantica, paratype. Top - Right tentacle. Note that two suckers are present, one at the broken tip and the other midway along the tentacle. Insect pins holding the tentacle in position. Bottom -  Left tentacle.  Note that two suckers are present, a small one near the base of the glandular region and a larger one midway from the first sucker to the broken tip. Tentacles have been stained with methylene blue to enhance the surface structure. Photographs by R. Young.

3. Head
   1. Beaks are described here.
      
      
4. Funnel
   1. Funnel locking-apparatus oval without tragus or antitragus.
   

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   Figure. Frontal view of the funnel component of the funnel locking-apparatus of M. atlantica, paratype. Apparatus slightly distorted. Photograph by R. Young.

5. Viscera
   1. Nuchal cartilage thin.
   

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   Figure. Dorsolateral view of the nuchal region of M. atlantica, paratype, showing nuchal cartilage (arrow). Photograph by R. Young.

   

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   Figure. Ventral view of the mantle cavity of M. atlantica, paratype, showing the viscera. Insert shows an expanded view of the squid for orientation. Photograph by R. Young.

6. Measurements
   1. ML - 53, FL - 41, FW - ca. 52, Tail Length - 2+, Eye Diameter -
      ca. 4.5, Lens Diameter - 1.7, HW - 7, Arm I length (right) - 9, Arm I length
      (left) - 8.5, Arm II length (right) - ca. 8.5, Arm II length (left) - 10,
      Arm III length (right) - 8.5, Arm III (left) - 9, Arm IV length (right) -
      10, Arm IV length (left) - ca. 10.

References

Vecchione, M. and R. E. Young. 2006. The squid family Magnapinnidae (Mollusca; Cephalopoda) in the North Atlantic with a description of Magnapinna atlantica, n. sp.. Proc. Biol. Soc. Wash. 119 (3): 365-372.