Ptychogastria polaris Allman, 1878
Phylum Cnidaria / Class Hydrozoa / Order Trachymedusae / Family Ptychogastriidae

Don’t expect to find this attractive jelly on your next boating excursion – it lives in deep water of places like Monterey Canyon or the fjords of British Columbia, and shallow water (10 meters depth) in Arctic and Antarctic habitats. It’s too bad since it is one of the more beautiful jellies anywhere. Although capable of swimming, Ptychogastria normally sits attached to rock walls using adhesive tentacles. Additional filiform tentacles extend outward to capture passing prey. Both the adhesive and filiform tentacles are grouped into about 48 clusters. The bell is only a little more than 2 cm diameter at most and has 16 radiating ridges. Stomach lobes are attached to each of the 8 radial canals by mesentery tissue, with a conspicuous gonad pair on the side of each lobe (16 total and yellow in color). The muscular velum is relatively wide.

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