Voragonema pendunculata (No common name)

Voragonema pendunculata is a small (~4 cm across) red jellyfish that has 1000-2000 very fine tentacles. It also spends its entire life in the water column; it does not go through a sessile phase in its development, which makes it different from most other jellyfish.
First described in 1913 from a specimen collected near the mouth of the Columbia River, we often see these jellies near Southern Hydrate Ridge, hovering above the methane seep areas.
Reference:
Wikipedia
WoRMS Taxonomic Database
Marine Life Field Guide (Neptune Canada)