| Noun | 1. | protoctist family - any of the families of Protoctista kingdom Protoctista, Protoctista - in most modern classifications, replacement for the Protista; includes: Protozoa; Euglenophyta; Chlorophyta; Cryptophyta; Heterokontophyta; Rhodophyta; unicellular protists and their descendant multicellular organisms: regarded as distinct from plants and animals family Globigerinidae, Globigerinidae - a family of protoctists family Nummulitidae, Nummulitidae - a family of fossil protoctists Arcellidae, family Arcellidae - soil and freshwater protozoa; cosmopolitan in distribution family Tribonemaceae, Tribonemaceae - simple filamentous freshwater yellow-green algae family Laminariaceae, Laminariaceae - large family of marine brown algae including many economically important large kelps chiefly of northern waters family Fucaceae, Fucaceae - small family of brown algae: gulfweeds; rockweeds Euglenaceae, family Euglenaceae - considered green algae family Volvocaceae, Volvocaceae - unicellular or colonial biflagellate free-swimming flagellates Chlamydomonadaceae, family Chlamydomonadaceae - green algae some of which are colored red by hematochrome family Zygnemataceae, Zygnemataceae - pond scums: common freshwater algae forming green slimy masses family Oedogoniaceae, Oedogoniaceae - filamentous green algae Characeae, family Characeae - green algae superficially resembling horsetail ferns: stoneworts Desmidiaceae, family Desmidiaceae - unicellular algae family Gigartinaceae, Gigartinaceae - a family of protoctist family Rhodymeniaceae, Rhodymeniaceae - a family of protoctist Bangiaceae, family Bangiaceae - a family of protoctist family Peridiniidae, Peridiniidae - marine and freshwater dinoflagellates Eimeriidae, family Eimeriidae - a family of protoctist in the order Coccidia family Plasmodiidae, Plasmodiidae - malaria parasites family Haemoproteidae, Haemoproteidae - bird parasites Babesiidae, family Babesiidae - piroplasms and cattle pathogens family - (biology) a taxonomic group containing one or more genera; "sharks belong to the fish family" |