Bright red in color, especially specimens from great depths; some specimens are colorless.
Arctic species. Found in the Barents Sea, Kara Sea, Laptev Sea, Bering Sea.
Hyperbenthic species.
Umbrella half-spherical in shape. The ex-umbrella contains 16 ridges on its surface which are intermittent with 16 crevices. Velum very wide. 8 radial canals widen toward the end; 8 centripetal canals originate from the wide circular canal. The edge of the umbrella thickened, carries about 48 groups of tentacles of 2 types: long and short. The number of short tentacles, which may have suckers, can reach a thousand. The manubrium is fused to the sub-umbrella surface with 8 mesenteries, which extend along the edge of the umbrella and divide its internal space into 8 isolated chambers. The edge of the umbrella carries 16 small statocysts, each one of which carries 1 concretion.
Height up to 12 mm, diameter up to 15 mm.
Ptychogastria polaris is een hydroïdpoliep uit de familie Ptychogastriidae. De poliep komt uit het geslacht Ptychogastria. Ptychogastria polaris werd in 1878 voor het eerst wetenschappelijk beschreven door Allman.
Bronnen, noten en/of referenties
