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    Helmet jellyfish - Wikipedia

    The helmet jellyfish (Periphylla periphylla), sometimes called the merchant-cap, is a luminescent, red-colored jellyfish of the deep sea, belonging to the order Coronatae of the phylum Cnidaria. It is the only species in the monotypic genus Periphylla and is one of the rare examples in Scyphozoa which life-cycle … Meer weergeven

    Helmet jellyfish reach a body size of up to 30 cm (12 in). The average wet weight of the jellyfish is 540 grams. Overall, helmet jellyfish have a uniform size. They consist 90% of water,… Meer weergeven

    The helmet jelly is found in nearly every ocean of the world, as well as in the Norwegian fjords and in the Mediterranean Sea. The only ocean they are… Meer weergeven

    The jellyfish is found in depths up to 2700 meters and is adapted to its dark environment. Not only have they become adapted and … Meer weergeven

    Periphylla periphylla represents an exception, very rarely found in the phylum Cnidaria: the medusae do not go through a polyp … Meer weergeven

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  2. Periphylla - Wikipedia

  3. Creature Feature: Helmet jellyfish - Twilight Zone

  4. ADW: Periphylla periphylla: INFORMATION

    WebThe value for P. pe­ri­phylla, cal­cu­lated in the range of 5°C - 10°C, was found to be 2.6. This value in­di­cates that tem­per­a­ture af­fects the bio­chem­i­cal re­ac­tions of the or­gan­ism. A value of 1 would mean that the or­gan­ism is …

  5. Periphylla periphylla - Wikipedia

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    The diagonal is used for the corkscrew reaction that is used in order to obtain and capture prey. Periphylla periphylla represents an exception, very rarely found in the phylum Cnidaria: the medusae do not go through a polyp stage, thus presenting a "holopelagic" life cycle.
    en.wikipedia.org/wiki/Helmet_jellyfish
    In February 2010, direct visual observations of groups were made at the surface, as well as with the ROV which documented that P. periphylla would form groups also at depth ( Fig. 5 ). In total 5 pairs of individuals with their tentacles entangled were recorded with the ROV.
    While it has a wide distribution, P. periphylla is significantly more abundant in some Norwegian Fjords. ( BBC, 2005; Brueggeman, 1998; Dupont and Aksnes, 2010) These members of the Class Scyphozoa live anywhere from the surface to 1000 meters deep in the ocean. At night, or when feeding, they may get closer to the surface.
    animaldiversity.org/accounts/Periphylla_periphylla/
    The water content of P. periphylla is 95.7 - 96.6 percent of the total wet weight. The measured salinity of the surrounding water when this was measured was 33.1-33.3 percent. Periphylla periphylla are one of the only five scyphozoan species that is bioluminescent.
    animaldiversity.org/accounts/Periphylla_periphylla/
  7. Periphylla | Encyclopedia MDPI

  8. Social behaviour in mesopelagic jellyfish | Scientific …

    Web11 jun. 2015 · We made acoustic records of diel migrating jellyfish Periphylla periphylla forming small, ephemeral groups at the upper fringe of an acoustic scattering layer consisting of krill.

  9. Marine Curios #1 – Periphylla periphylla, or helmet jellyfish

  10. Fecundity and early life of the deep-water jellyfish Periphylla ...

  11. Causes for mass occurrences of the jellyfish Periphylla periphylla: a ...