Pyrosoma verticillatum Neumann, 1909 Pyrosomella verticillata, the fire salp, is a species of colonial pyrosome with an Indo-Pacific distribution.

[4] The species occurs in the warm Indo-Pacific and from the Cape of Good Hope to Japan, and has also been reported from the southwest Atlantic off Rio de Janeiro.

[5] The species is bioluminescent, with each zooid possessing a pair of luminescent organs next to the oral siphon, within which light production is probably carried out by symbiotic bacteria.

Light emission is accompanied with cessation of cilia motion in zooids' oral siphons, causing colonies to start sinking in the water column.

This combined bioluminescence and descent behavior has been interpreted as a technique for avoiding predation.