Overview

Brief Summary

Biology

only medusae, direct development
  • UNESCO-IOC Register of Marine Organisms
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Comprehensive Description

Biology

A deepwater polar hydromedusae
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Source: Arctic Ocean Diversity

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deep-red color; 10-14 radial canals, as opposed to eight radial canals common to other species of Crossota; About 275 tenacles; Stomach bottle shaped, with irregular longitudinal ridges and invaginations; 5-7 upturned lips; Without gastric preducles; Gonads on radial canals near base of stomach; Statocysts unknown
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Biology

Crossota norvegica does not have a sessile stage; rather, they spend their entire lives as plankton. They only reproduce sexually as medusa and never form polyps. They are a brilliant, blood-red color and have been observed as deep as 2600 meters under the deep Arctic Canada Basin.

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Distribution

Found in the Arctic Ocean

The deep red colored C. norvegica as observed at station 9 at 2605m and collected at 1595 m at station 11(Fig. 2, H). The collected specimen had 10 radial canals,as opposed to eight radial canals
common to other species of Crossota (see http://www.mpcfaculty.net/kevin_raskoff/arctic05paper.htm for additional photos of
this specimen). It was collected in the nets only between 1000
and –2000m.

  • Raskoff, K. A., Hopcroft, R. R., Kosobokova, K. N., Purcell, J. E. & Youngbluth, M. (2010) Jellies under ice: ROV observations from the Arctic 2005 Hidden Ocean Expedition. Deep-sea research II, 57, 111–126.
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Physical Description

Diagnostic Description

No gastric peduncle; stomach bottle-shaped with irregular longitudinal ridges; mouth with 5 to 7 upturned lips; 10-14 radial canals; gonads on radial canals near base of stomach; about 275 marginal tentacles. Height of umbrella 18 mm; width 20 mm; the color of umbrella is a deep reddish brown.

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Ecology

Habitat

Depth range based on 8 specimens in 1 taxon.
Water temperature and chemistry ranges based on 8 samples.

Environmental ranges
  Depth range (m): 687 - 937
  Temperature range (°C): 3.741 - 3.962
  Nitrate (umol/L): 14.450 - 15.089
  Salinity (PPS): 34.891 - 34.892
  Oxygen (ml/l): 6.523 - 6.562
  Phosphate (umol/l): 1.117 - 1.150
  Silicate (umol/l): 10.030 - 11.964

Graphical representation

Depth range (m): 687 - 937

Temperature range (°C): 3.741 - 3.962

Nitrate (umol/L): 14.450 - 15.089

Salinity (PPS): 34.891 - 34.892

Oxygen (ml/l): 6.523 - 6.562

Phosphate (umol/l): 1.117 - 1.150

Silicate (umol/l): 10.030 - 11.964
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Arctic; Bathypelagic (below 1000 m), often observed near the seafloor, so rarely collected by nets
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Trophic Strategy

Diet is unknown
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Life History and Behavior

Life Cycle

Holoplanktonic, without a polyp stage
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Wikipedia

Crossota norvegica


Crossota norvegica is a species of jellyfish in the phylum Cnidaria in the genus Crossota. It is closely related to Crossota millsae. It lives at depths below 1,000 m (3,300 ft) in the Arctic Ocean.[1]

Philatelic error

Crossota norvegica appeared on a stamp issued by Canada in 2007 to commemorate the International Polar Year.[2] Unfortunately, the name on the stamp was given as Crossota millsaeare, a misspelling of Crossota millsae.[3]

References

  1. ^ Raskoff, K., and R. Hopcroft (2010). Crossota norvegica. Arctic Ocean Diversity. Accessed 5 August 2012.
  2. ^ http://www.wnsstamps.ch/stamps/2007/CA/CA005MS.07.jpg
  3. ^ http://maillists.uci.edu/mailman/public/cnidaria/2007-February/001299.html
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