Pyrosoma atlanticum

Taxon-Order: 

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Distribution: 
Between 50°N and 50°S in all oceans.
Habitat: 
Undergo diel vertical migrations from surface waters to 750 m depth.
Size: 
To 600 mm
Diet: 
Plankton (centric diatoms, silico-flagellates and even fragments of small crustaceans, coccolithophores).
Predators: 
Demersal fish.
Useful Facts or Characters: 

A colony with tough consistency and cylindrical in shape; one end open and one end closed.  It narrows toward the closed end and can be pink or yellowish pink in color.

Natural History: 

Pyrosomes are hollow tubular colonies of individual zooids that reside next to one another in a common tunic and result from asexual reproduction.  Pyrosomes often produce light (bioluminescence) and are capable of forming dense aggregations.