A genus of small, primitive fish-like animals called lancelets that have gill slits but no true jaws.
From Greek branchia (gill) + stoma (mouth), referring to these creatures' gill openings; this is a scientific genus name.
Lancelets (Branchiostoma) are living fossils that show us what our own evolutionary ancestors looked like 500 million years ago—they're basically the missing link between simple worms and fish!
Complete word intelligence in one call. Free tier — 50 lookups/day.