Luteuthis shuishi Description Continued

1. Mantle
   1. Mantle opening narrow.
   

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   Figure. Enlargement of one of the title photographs of L. shuishi showing the funnel and mantle opening. Photograph from O'Shea and Lu, 2002.

2. Optic lobe
   1. Optic lobe spherical.
   2. Single optic nerve bundle arises from optic lobe.
   

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   Figure. Dissection of the head of L. shuishi showing optic lobe, nerve bundle and white body of holotype. Photograph from O'Shea and Lu, 2002.

3. Beaks
   1. Lateral walls of lower beaks with a weak fold on either side that runs from the jaw angle to the lower corner of lateral wall.
   

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   Figure. Oblique and lateral views of the upper beak (top) and the same views of the lower beak (bottom) of L. shuishi, holotype. Photographs from O'Shea and Lu, 2002.

4. Radula
   1. Radula with 8 rows of long narrow, homodont teeth.
   

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   Figure. Radula of L. shuishi, holotype. Note the asymmetry in the photograph. A diamond shape is placed on the rhachidian tooth series. The extra tooth series (coleoid radulas have a maximum of seven series), apparently, represents an enlarged marginal plate along the right side. Photomicrograph from O'Shea and Lu, 2002

5. Pigmentation
   1. Dorsal and ventral surfaces of mantle, head and arms white to translucent.
   2. Distal margin of fin pinkish red (see dorsal and ventral views of the web in photographs below) .
   

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   Figure. Dorsal (left) and ventral (right) views of the fins of L. shuishi, holotype. Photographs from O'Shea and Lu, 2002.

   3. Oral face of arms beside each sucker row pinkish red as is central, oral region of the web.
   

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   Figure. Oral view of arms and web of L. shuishi, holotype. Photograph from O'Shea and Lu, 2002.

   4. Cirri darker red.
   5. Eyes scarlet, opening to eye (eyelid) lightly pigmented (see arrow in the photograph).
   

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   Figure. Enlargement of portion of the head of L. shuishi showing eye and opening of canal that leads to the eye, holotype. Photograph from O'Shea and Lu, 2002.

   6. Tip of funnel heavily pigmented (see photograph at the top of this page).
      
      
6. Measurements and counts

   Sex	Female
   Mantle length	87.5 mm
   Mantle width	130
   Mantle aperature	30
   Fin length	95
   Fin width	48
   Eye lid opening	8
   Arm I, length (right/left)	250*/238
   Arm II, length	280/259
   Arm III, length	278/244
   Arm IV, length	223/242
   Web depth, sector A	67.5
   Web depth, sector B	53/60
   Web depth, sector C	51/68
   Web depth, sector D	39/50
   Web depth, sector E	30
   Arm I, sucker count	47*/35*
   Arm II, sucker count	57*/44*
   Arm III, sucker count	46*/43*
   Arm IV, sucker count	36*/40*
   Max. cirrus length	1.0-1.5
   Max. sucker diameter	3.7-4.0
   Gill lamellae	-

   * Damaged

   These measurements and counts are from O'Shea and Lu, 2002.

Comments

References

O'Shea, S. and C. C. Lu. 2002. A New Species of Luteuthis (Mollusca: Cephalopoda: Cirroctopoda) from the South China Sea. Zoological Studies, 41: 119-126.