Overview

Brief Summary

Introduction

Cirroctopus mawsoni is the type species of the genus. It was described from a single specimen.

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Comprehensive Description

Characteristics

  1. Arms and web
    1. Arm sucker count 27-31 [arms I-IV, holotye (O'Shea, 1999)].
    2. Figure. Oral view of left arm I and adjoining web of C. mawsoni. Drawing from Berry, 1917.

    3. Sucker 11 of right arm I.
    4. Figure. Oral view of arm I sucker and adjacent cirri of C. mawsoni. Drawing from Berry, 1917.

    5. Measurements
      1. Mantle length.....................12 mm*
      2. Total length......................32 mm
      3. Posterior mantle to base arms I...15 mm
      4. Mantle width......................09 mm
      5. Head width........................09 mm
      6. Width across fins.................28 mm
      7. Fin length........................08 mm; 12 mm*
      8. Fin width (midpoint)..............06.5 mm
      9. Funnel length.....................03.5 mm
      10. Length, arms I....................17 mm; 12.3*
      11. Length, arms II...................10.8 mm*
      12. Length, arms III..................10 mm*
      13. Length, arms IV...................10 mm*
      14. Web depth, sector A...............11 mm*
      15. Web depth, sector B...............10 mm*
      16. Web depth, sector C...............09.4 mm*
      17. Web depth, sector D...............06.6 mm*
      18. Web depth, sector E...............05.4 mm*
      19. Sucker counts, arms I.............28/28*
      20. Sucker counts, arms II............27/27*
      21. Sucker counts, arms III...........27/31*
      22. Sucker counts, arms IV............29/27*
      23. Largest arm sucker diameter.......0.6 mm*
      24. Largest cirri.....................0.5-1.0 mm*
      25. Gill lamellae.....................4?*
      26. Sex...............................?
        * - Measurements of holotype from O'Shea, 1999. Other measurements from Berry, 1917.

    Comments

    Insufficient information exists to separate this species from G. glacialis although it has a lower arm sucker count (O'Shea, 1999) (but the holotype is smaller). If they prove to be synonymous, G. mawsoni has priority. Descriptions of animals in good condition from the type locality are needed.

    This species differs from G. hochbergi in having a much lighter ventral mantle surface and a lower arm sucker count (O'Shea, 1999). Some specimens of G. glacialis, at least, also have a much lighter ventral mantle (see photos under "Pigmentation" for that species).

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Distribution

Type locality: Off Adelie Land, Antarctic waters at 66°55'S, 145°21'E, 530-550 m.

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Ecology

Habitat

Depth range based on 2 specimens in 1 taxon.
Water temperature and chemistry ranges based on 2 samples.

Environmental ranges
  Depth range (m): 446 - 620
  Temperature range (°C): -1.014 - -0.110
  Nitrate (umol/L): 31.473 - 31.560
  Salinity (PPS): 34.495 - 34.573
  Oxygen (ml/l): 5.011 - 5.685
  Phosphate (umol/l): 2.234 - 2.361
  Silicate (umol/l): 75.628 - 87.605

Graphical representation

Depth range (m): 446 - 620

Temperature range (°C): -1.014 - -0.110

Nitrate (umol/L): 31.473 - 31.560

Salinity (PPS): 34.495 - 34.573

Oxygen (ml/l): 5.011 - 5.685

Phosphate (umol/l): 2.234 - 2.361

Silicate (umol/l): 75.628 - 87.605
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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