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Overview of Actinopods: Marine Protists with Unique Feeding Strategies and Shells

Actinopods, unicellular protists from the Phylum Actinopoda, primarily inhabit marine environments as plankton. They possess axopods, elongated structures supported by microtubules, which protrude through their porous shells and help in capturing prey. Actinopods predominantly consume unicellular algae, using their axopods to ensnare and engulf them through cytoplasmic streaming. These organisms also engage in photosynthesis via algal endosymbionts. Reproduction occurs through binary fission or budding, and members like radiolarians are known for their intricate silica shells, often invisible under a light microscope.

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Overview of Actinopods: Marine Protists with Unique Feeding Strategies and Shells

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  1. ACtinopods From the Phylum Actinopoda

  2. Basic description • Unicellular protists • Mostly marine plankton organisms • Have axopods that protrude through pores in their shells • Axopods are strengthened by a cluster or microtubules

  3. What do they eat? • Unicellular algae

  4. How do they Eat? • Actinopods use axopods to trap prey • Prey becomes entangled in axopods & is later engulfed outside the main body • Cytoplasmic streaming carries prey back within the shell

  5. Do they photosynthesize? • Yes • Photosynthesize through algal endosymbionts

  6. reproduction • By binary fission or budding

  7. Movement • Some produce flagellated reproductive cells

  8. Radiolarians • Classified as an Actinopod • Some Actinopods secrete shells made of silica, which are known as radiolarians • Radiolarians are usually not visible to a light microsope

  9. The end!

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