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Consensus life cycle of free-living protists, including sexual reproduction (red arrows), asexual reproduction (green arrows), colonial stages (blue), and formation of cysts. Each protist group has a different sexual cycle (light purple) as well as different means of exiting the colonial stage. [150]
The haploid life cycle (left) represents the life of a haploid individual that reproduces by fusing with a different individual (syngamy) and then undergoing meiosis to form new individuals. The diploid life cycle (right) represents the life of a diploid individual that reproduces by undergoing meiosis to generate gametes, which in turn fuse ...
Diagram of a typical foraminiferan life cycle, showing characteristic alternation of generations. Foraminifera exhibit morphological dimorphism associated with their reproductive cycle. The gamont, or sexually reproducing haploid form, is megalospheric—that is, its proloculus, or first chamber, is proportionally large.
The inner circuit illustrates the fully haploid "apogamic" life cycle. Both cycles exhibit all developmental stages. Physarum polycephalum, an acellular [1] slime mold or myxomycete popularly known as "the blob", [2] is a protist with diverse cellular forms and broad geographic distribution.
Indeed, during dinoflagellate evolution the need to adapt to fluctuating environments and/or to seasonality is thought to have driven the development of this life cycle stage. Most protists form dormant cysts in order to withstand starvation and UV damage. [104]
In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...
Parasitic protozoa use a wide variety of feeding strategies, and some may change methods of feeding in different phases of their life cycle. For instance, the malaria parasite Plasmodium feeds by pinocytosis during its immature trophozoite stage of life (ring phase), but develops a dedicated feeding organelle (cytostome) as it matures within a ...
Cilia occur in all members of the group (although the peculiar Suctoria only have them for part of their life cycle) and are variously used in swimming, crawling, attachment, feeding, and sensation. Ciliates are an important group of protists , common almost anywhere there is water—in lakes, ponds, oceans, rivers, and soils, including anoxic ...