Pteropoda
Prymnesiophyta. (Tardent 1993)
oceanic forms that, except for Emiliania and Gephyrocapsa, are adapted to
low nutrient levels. Coccoliths are abundant in Mesozoic and Cenozoic sediments. Phaeocystis is an important colonial, non-calcareous Prymnesiophyta.
pseudofeces ~ctenidium.
pseudoneuston ~neuston.
PSP ~paralytic shellfish poisoning.
psychrophile (syn. cryophile) able to grow at low temperatures.
Pterobranchia ~Hemichordata.
Pteropoda marine Gastropoda highly adapted to a pelagic life-style ("sea butterflies"), naked or with shells composed of aragonite (~carbonate, minerai). The
f
~
Pteropoda. (Hardy 1958)