sīˈfistəmə noun
( plural scyphisto·mae -(ˌ)mē ; also scyphistomas )
Etymology: New Latin, from scyph- + -stoma
: a sexually produced polypoid larva of many scyphozoans that is attached to the substrate, may produce other scyphistomae by budding, but ultimately repeatedly constricts transversely and abscises ephyrae which develop into free-swimming medusae — see strobila