NOTE: The current system of classification for eukaryotes has been changed. In , based on new phylogenetic data the kingdom Protista was split into 5. Learn about the requirements to enter Kingdom Protista, one of the five kingdoms of life. Discover and read about the organisms that can be. Define kingdom Protoctista. kingdom Protoctista synonyms, kingdom Protoctista pronunciation, kingdom Protoctista translation, English dictionary definition of.

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The dictionary meaning of the word plasmodium is “a form within the life cycle of some simple organisms such as slime moulds, typically consisting of a mass of protoplasm containing many nuclei”.

During unfavorable conditions, plasmodia differentiate to form fruiting bodies bearing spores at the tip. This number is a matter of taste rather than tradition because there are no established rules for defining protoctist phyla.

Some have flagella or cilia.

For example, the word “protist pathogen ” may be used to denote any disease-causing microbe that is not bacteriavirusviroid or metazoa. Members of Protista are primarily aquatic in nature. The shells of fossil diatoms form thick deposits on the sea floor known as ‘ d iatomaceous earth’. Cryptophytaphylum Cryptophyta – a phylum in the kingdom Protoctista.

Protists were traditionally subdivided into several groups based on similarities to the “higher” kingdoms such as:. Unity, diversity and evolution.

kingdom Protoctista

Archaeplastida Chloroplastida ” green algae “: In contrast, Copeland’s term included nucleated protoctlsta such as diatomsgreen algae and fungi. For example, the ciliates Ciliophorawhich are unicellular microbes, include at least one species that forms a sorocarp, a multicellular spore-bearing structure; euglenoids, chrysophytes and diatoms also have multicellular derivatives. These organisms have ability of bioluminescence.


Reproduction in protists is both asexual and sexual. The word had been introduced by John Hogg in to designate “all the lower creatures, or the primary organic beings;-both Protophyta. It is believed to be the most supply of oxygen on Earth is from the plant-like protists. Plant-like protists have chlorophyll like that in plants.

Furthermore, distinguishing species of kingom living protoctists often requires time-consuming genetic, morphologic and ultrastructural studies. All of the seaweed pictures here were taken by Luis Solorzano using an Olympus C digital camera. Phylum Ciliophora Ciliates – Protozoans of this phylum move with hair like structures called cilia. In cladistic classification, the contents of Kigndom are distributed among various supergroups SARsuch as protozoa and some algae, Archaeplastidasuch as land plants and some algae, Excavatawhich are a group of unicellular organisms, and Opisthokontasuch as animals and fungi, etc.

Flagellum Cilium Pseudopodia Gliding motility. Because the protists as a whole are paraphyleticnew systems often split up or abandon the kingdom, instead treating the protist groups as separate lines of eukaryotes.

Kingdom Protista

Characteristics of Kingdom Protista: Quarterly Journal of Microscopical Science. They kingdoom from animals being unicellular while animals are multicellular. During the formation of the pseudopodia the cytoplasm streams into the lobe causing the lobe to ‘ooze’ and grow.


Chrysophytadivision Chrysophyta – mostly freshwater eukaryotic algae having the chlorophyll masked by brown or yellow pigment; yellow-green and golden-brown algae and diatoms: Meanwhile, a protist, Mixotricha paradoxa that has lost its mitochondria uses endosymbiontic bacteria as mitochondria and ectosymbiontic hair-like bacteria Treponema spirochetes for locomotion.

Other protists can engulf bacteria and other food particles, by extending their cell membrane around them to form a food vacuole and digesting them internally in a process termed phagocytosis. The cilia is also used to sweep food particles into the organism. More probable eukaryote fossils begin to appear at about 1.

Kingdom Protista

Clifford Dobell Leeuwenhoek scholar Brian J. They are with or without a cell wall. Wikipedia indefinitely move-protected pages Articles with ‘species’ microformats All articles with specifically marked weasel-worded phrases Articles with specifically marked weasel-worded phrases from April Protovtista articles with unsourced statements Articles with unsourced statements from April All Wikipedia articles needing clarification Wikipedia articles needing clarification from April Commons category link is on Wikidata Wikipedia articles with GND identifiers Wikipedia articles with NDL identifiers.

They have cell walls made of cellulose and pectin. InHerbert Copeland resurrected Hogg’s label, arguing that Haeckel’s term Protista included anucleated microbes such as protoctistwhich the term “Protoctista” literally meaning “first established beings” did not.