"Spongoblast" is a term used in the field of marine biology to refer to a larval stage of sponges. The correct spelling of this word is /ˈspɒŋɡəʊblæst/. The first syllable is pronounced as "spung" with a nasal "ng" sound at the end. The second syllable is pronounced as "oh" with a short "o" sound, and the "b" and "l" are pronounced as a blend. The final syllable is pronounced as "last" with a short "a" sound. Proper spelling and phonetic transcription are crucial in communicating scientific terms accurately.