ereyga "sertularian" kama soo baxo inta badan qaamuusyada Ingiriisiga caadiga ah. Si kastaba ha ahaatee, "Sertularia" waa cirifka hydrozoan cnidarians, oo badanaa loo yaqaan "fir badeed" ama "horny coral," oo laga helo bay'ada badda. Noolahani waxa ay samaystaan guumaysyo ka kooban burooyin gaar ah, mid walbana waxa uu leeyahay qaab-dhismeedka koobka qaabaysan ee loo yaqaan hydrotheca, kaas oo loo isticmaalo quudinta iyo taranka. Sertularians waa qayb muhiim ah oo ka mid ah hab-nololeedyada badda, waxaana aad u daraaseeyay khubarada bayooloji iyo ecologists.