Standard plankton nets are generally lowered and retrieved at a speed of ~0.5 ms -1. The net is towed vertically from above the bottom to the surface, bringing with it a representative sample of plankton – inclusive hydromedusae and siphonophores – from the entire water column. Most of the pelagic hydrozoans for HYPNO are collected with simple plankton nets, in the case of this Arctic cruise the double one you see in the picture. HYPNO participating on an Arctic cruise by the Institute of Marine Research on RV Helmer Hanssen 17 Aug –. The species has been known to science only for some years, and indeed very few people may have seen it alive, but this does not necessarily mean that it is an uncommon animal: in fact, it may be extremely abundant in some places and is perhaps one of the most common species living at certain depths in the Central Arctic Ocean. Jean Bouillon (1926-2009), one of the most prolific authors in Hydrozoan biology in the 20th century. The word bouilloni in the name of this critter is a tribute to Dr. Bathykorus is a combination of Bathy (from bathus, meaning depth or deep in Greek) and korus (also from Greek, meaning helmet), and it refers to the deep-sea habitat of the species, as well as to the helmet-like shape of the bell (like that of an intergalactic villain). Kevin Raskoff, who gave it its appropriate name. This jellyfish was described in 2010 by Dr. This is the original photograph of a live specimen included in the description of the species, next to a pic of its look-alike.
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