''Rosacea'' is a genus in the

Prayidae Prayidae is a family of marine invertebrates in the order Siphonophorae. They are colonial, and the colonies can superficially resemble jellyfish; although they appear to be a single organism, each specimen is actually a colony of Siphonophor ...

. The genus contains bioluminescent species.

References

Prayidae Hydrozoan genera Bioluminescent cnidarians {{Siphonophorae-stub