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    Marrus orthocanna is a species of pelagic siphonophore, a colonial animal composed of a complex arrangement of zooids, some of which are polyps and some medusae. Swimming independently in the mid-ocean, it lives in the Arctic and other cold, deep waters. It is a colonial creature that is born from โ€ฆ See more

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    Like other siphonophores, Marrus orthocanna is a colony composed of a number of specialised zooids linked together by a long stem. They have different functions such as locomotion, โ€ฆ See more

    Marrus orthocanna occurs pelagically in the mesopelagic zone of the Arctic Ocean, the north west Pacific Ocean, the Bering Sea, the See more

    Like most other siphonophores, pelagic siphonophores are active swimmers. When its bell-shaped echo is contracted, water is pushed out causing the flock to move. The medusa's contractions are coordinated to allow the animal to swim forward, sideways, โ€ฆ See more

    Marrus orthocanna can reach lengths of 2-3 meters long and the tentacles can extend fifty centimeters on either side. It moves forward intermittently before pausing to put out its "fishing lines", ready to ensnare passing creatures. It is a carnivore whose โ€ฆ See more

    The first siphonophorae to be described was the Portuguese Man O'War in 1758 by Carl Linnaeus. Until the 19th century, only three more species were described. However in the โ€ฆ See more

    โ€ข Physonect siphonophore poster, NOAA Office of Ocean Exploration
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    Stephanomia amphytridis is a large and prominent species reaching up to 5 m in length, with 25 or more very large nectophores and a distinctive semirigid orange siphosome which is enclosed by many robust bracts (Pugh and Baxter 2014 ).
    The species Stephanomia amphytridis Lesueur & Petit, originally established on the basis of only an illustration of part of the siphosome, is poorly known and several descriptions in the past have been based on further siphosomal material that actually belonged to a species of Halistemma.
    This family has only recently been reinstated by Pugh and Baxter ( 2014) for a single large species Stephanomia amphytridis (Table 2) first figured from the siphosome only in 1807 by Lesueur and Petit, and subsequently found with nectosomal zooids at a number of temperate and tropical locations worldwide (except the South Pacific).
    The name Stephanomiidae was introduced by Huxley for a second siphosome he found off the east coast of Australia in 1859, which was found again by Bigelow in the tropical east Pacific in 1911, and again by Mapstone from the Flores Sea in Indonesia in 2004, this time with the nectosome as well.
  4. Stephanomia - Wikipedia

  5. Systematics of Siphonophores | SpringerLink

  6. A review of the physonect siphonophore genera - Biotaxa

  7. First full description of the large physonect siphonophore

  8. A review of the physonect siphonophore genera Halistemma โ€ฆ

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