Crossota norvegica

Crossota norvegica is a species of hydrozoan in the family Rhopalonematidae. It is closely related to Crossota millsae and is found in the Arctic Ocean at depths below 1,000 m (3,300 ft).[1] Crossota norvegica is also known as the “Deep-Red Jellyfish.” This species is described as “alien-like” and is known for its vibrant red hue. It is a small cnidarian, reaching only up to 2 cm in its body size.[2]

Crossota norvegica
Scientific classification
Kingdom: Animalia
Phylum: Cnidaria
Class: Hydrozoa
Order: Trachymedusae
Family: Rhopalonematidae
Genus: Crossota
Species:
C. norvegica
Binomial name
Crossota norvegica
Vanhöffen, 1902

Description

Unlike other cnidarians, Crossota norvegica lives its entire life in the planktonic stage or the planula stage, instead of experiencing both the sessile stage and planula stage. Another unique trait off this species is that it does not develop into a polyp. Polyps typically produce the sexual reproduction gametes of cnidarians by budding. These polyps are stationary and non-moving forms of cnidarians (The Columbia Encyclopedia).[3] Others will reproduce sexually in the medusa stage, where they are free-swimming cnidarians. During this stage they are typically very small, around 1-50mm in diameter. It is unclear whether or not this species is dioecius, meaning that it needs both a male and a female in order to reproduce. Alternatively, some hydrozoa, but not all, can be sequential hermaphrodites where they can produce and fertilize eggs on their own, without a partner.[4] Crossota norvegica is closely related to the Crossota millsae, in which both males and females have been found and described to reproduce together. As a part of the cnidarian family, they have ectodermal cells that contain nematocysts (cnidae). Some of these nematocysts have the ability to sting. Along the cnidae are spines that will produce an acid. When the cnidae comes into contact, the nematocysts get stuck into prey. Though these are a very common type of cnidae, not all cnidae have the ability to produce acid to stun prey.[4]

Habitat and diet

Crossota norvegica lives in temperatures ranging from 3.7˚C to 3.9˚C.[5] This species has been found in waters deeper than 2,500 m. Its diet is currently unknown. Many Hydrozoa will feed on small zooplankton by use of their tentacles, whereas others eat phytoplankton.[4]

Philatelic error

Crossota norvegica appeared on a stamp issued by Canada in 2007 to commemorate the International Polar Year.[6] Unfortunately, the name on the stamp was given as Crossota millsaeare, a misspelling of Crossota millsae.[7]

gollark: ... is that an <:illum:531316942443642880> on there?
gollark: How do you derive the rules and what do you mean by "branches on the picture"?
gollark: I don't know how to actually implement the thing it says about identifying things uniquely by "a sequence of numbers which says where to turn at each intersection", since it seems like you'd need a way to convert them into a unique/canonical form for that to actually work.
gollark: I looked at that, yes.
gollark: I just picked it several years ago because it looked cool.

References
  1. Raskoff, K., and R. Hopcroft (2010). Crossota norvegica. Arctic Ocean Diversity. Accessed 5 August 2012.
  2. Raskoff, K., and R. Hopcroft (2010). Crossota norvegica. Arctic Ocean Diversity. Accessed 15 February 2018.
  3. The Columbia Encyclopedia. Encyclopedia.com. Accessed 15 February 2018.
  4. Hammond, G. (2009). "Hydroza". Animal Diversity. Accessed 15 February 2018.
  5. OBIS. Ocean Biogeographic Information System. Accessed 15 February 2018.
  6. "Archived copy". Archived from the original on 21 May 2011. Retrieved 13 November 2008.CS1 maint: archived copy as title (link)
  7. https://archive.today/20120717235742/http://maillists.uci.edu/mailman/public/cnidaria/2007-February/001299.html. Archived from the original on 17 July 2012. Retrieved 13 November 2008. Missing or empty |title= (help)
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