Marsupium Explained

Marsupium is the Latin word for a (brood) pouch in several animal groups:

Pouch (marsupial), in marsupials
Brood pouch (Peracarida), in peracarid crustaceans
Brood pouch (Syngnathidae), in syngnathids such as sea horses
Brood pouch (gastropod), a part of the reproductive system of gastropods, a structure in ovoviviparous gastropods, where embryos develop

See also