salp

noun, plural sal·pas, sal·pae [sal-pee] /ˈsæl pi/.

1. any free-swimming, oceanic tunicate of the genus Salpa, having a transparent, more or less fusiform body.

noun plural -pas or -pae (-piː)

1. any of various minute floating animals of the genus Salpa, of warm oceans, having a transparent barrel-shaped body with openings at either end: class Thaliacea, subphylum Tunicata (tunicates)