This fluorescent jelly has lustrous tentacles that coil and adhere to its rim when not in use.
Its bell is translucent and pinstriped with opaque bands.
The flower hat jelly can grow to be about 15 cm (6 in) in diameter.
When first observed in the wild, typically around December, they only measure 2 cm (0.8 in).

Little is known about the details of its life cycle and no Olindias hydroids have been reported from the wild.
Flower hat jellies have bred in a display at the Monterey Bay Aquarium.
The hydroids attached themselves to various surfaces and formed small clusters.
Eventually the medusae were released at a diameter of about 1 mm (0.04 in).
Budding only happened when the hydroids were kept at water temperatures of 15 °C (59 °F); not 20 °C (68 °F) or 25 °C (77 °F).
In contrast, the two warmer temperatures appeared to produce more medusae.
This indicates that hydroid growth and reproduction (budding) occur in 15 °C (59 °F) or less, while warmer temperatures initiate the change into medusae.
This matches the annual sea temperature variations observed in its native range.
In aquariums, adults are usually kept in full salt water that is about 15–18 °C (59–64 °F).
This fluorescent jelly has lustrous tentacles that coil and adhere to its rim when not in use. Its bell is translucent and pinstriped with opaque bands. The flower hat jelly can grow to be about 15 cm (6 in) in diameter. When first observed in the wild, typically around December, they only measure 2 cm (0.8 in).
Little is known about the details of its life cycle and no Olindias hydroids have been reported from the wild. Flower hat jellies have bred in a display at the Monterey Bay Aquarium. The hydroids attached themselves to various surfaces and formed small clusters. Eventually the medusae were released at a diameter of about 1 mm (0.04 in). Budding only happened when the hydroids were kept at water temperatures of 15 °C (59 °F); not 20 °C (68 °F) or 25 °C (77 °F). In contrast, the two warmer temperatures appeared to produce more medusae. This indicates that hydroid growth and reproduction (budding) occur in 15 °C (59 °F) or less, while warmer temperatures initiate the change into medusae. This matches the annual sea temperature variations observed in its native range. In aquariums, adults are usually kept in full salt water that is about 15–18 °C (59–64 °F).
Flower hat jelly