Class

Hydrozoa (Hydrozoans)

Physophora hydrostatica. Photo: (c) Simon Varney, some rights reserved (CC BY-NC)

iNaturalist • Wikipedia

Hydrozoa (hydrozoans, from ancient Greek ὕδρα, hydra, “sea serpent” and ζῷον, zoon, “animal”) are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most living in salt water. The colonies of the colonial species can be large, and in some cases the specialized individual animals cannot survive outside the colony. A few genera within this class live in fresh water. Hydrozoans are related to jellyfish and corals and belong to the…

— Wikipedia

Subtaxa

Subclass: Hydroidolina (Hydroids)

Subclass: Trachylinae

Where in Humboldt

Discussion

PLEASE SHARE YOUR THOUGHTS ABOUT HYDROZOA, THE HYDROZOANS