[1] Rosalindidae are hydrozoans that are characterized by their ability to form colonies of polyps and attach to various surfaces, such as seaweed and shells, in the ocean.

[4] Rosalindidae make up the order Anthoathecata - a hydroid group generally known for its fragility due to the lack of a perisarc to protect its gonophores and hydranths.

[3] However, colonies of polyps that fall under the genus Rosalinda possess a perisarcal skeleton composed of hydranths with several tentacles covering the body.

Rosalindidae were spotted growing in deep-coral ecosystems in these oceanic areas, ranging from the deep-neritic to bathyal zones.

Rosalinda naumovi was identified in the shallower waters of the Northwestern Pacific while another unidentified species was discovered in Sagami Bay, Japan.

[5] One research expedition discovered Rosalindidae species among coral mounds near the West African coast.

[7] Rosalindidae are part of a larger group of hydrozoans, which consume phytoplankton, zooplankton, and tiny suspended particles using their tentacles.