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The amoeboids comprise those Protista that form pseudopods, temporary cytoplasmic projections that are involved in locomotion and ingesting food. Originally they were grouped together as the Sarcodina, but the different sorts of amoeboid forms have each evolved a number of times. These come in four main groups: those with lobose, filose, and reticulose pseudopods, which are unsupported, and those with axopods, which are rigid projections around microtubules. The main groups of protists with axopods are: :Actinophryida? :Centrohelida? :Desmothoracida? :Gymnosphaerida? :Acantharea :Polycystinea? :Phaeodarea? The last three of these are collectively referred to as the Radiolaria?, and are typically marine forms with intricate mineral skeletons. The others, collectively referred to as the Heliozoa?, are typically freshwater forms, usually sphere-shaped and covered in ray-like axopods that gather food (hence the name, sun animal). Reticulose pseudopods are cytoplasmic strands that branch and anastomose to form a net. They are found among the Granuloreticulosa?, which includes primarily the Foraminifera? - marine amoeboids with multichambered shells. |
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The amoeboids comprise those Protista that form pseudopods, temporary cytoplasmic projections that are involved in locomotion and ingesting food. Originally they were grouped together as the Sarcodina, but the different sorts of amoeboid forms have each evolved a number of times. These come in four main groups: those with lobose, filose, and reticulose pseudopods, which are unsupported, and those with axopods, which are rigid projections around microtubules. |
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:Pelobionta? - giant amoebae & kin |
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:Pelobionts - giant amoebae & kin |
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:Vampyrellids :Nucleariids :Chlorarachniophytes? Reticulose pseudopods are cytoplasmic strands that branch and merge to form a net. They are found most notably among the Granuloreticulosa?, which includes primarily the Foraminifera? - marine amoeboids with multichambered shells. Other forms include the Gymnophrea?, Komokiacea?, and Biomyxa?. Protists with axopods are traditionally divided into the Heliozoa? and the Radiolaria?. The former are usually sphere-shaped forms covered in axopods that catch food, and in motile forms, let them roll along the substrate. These are typically freshwater, and include the following: :Actinophryids :Centrohelids :Desmothoracids :Gymnosphaerids :Dimorphids? :Sticholonche? The latter are primarily marine with intricate mineral skeletons, and include three separate groups: the Acantharea, the Polycystinea?, and the Phaeodarea?. They are distinguished from the Heliozoa by the presence of a central capsule separating the inner cytoplasm (endoplasm) from the outer (ectoplasm). Along with the Foraminifera, these are the primary protozoa found in the fossil record. |
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