|
The actinophryids are a small, familiar group of heliozoan protists. They are the most common heliozoa in fresh water, and are especially frequent in lakes and rivers, but a few are found in marine and soil habitats as well. Each is unicellular and roughly spherical in shape, without any shell or test, and with many pseudopodia suported by axopods radiating outward from the cell body, which adhere to passing prey and allows it to roll or float about. The outer portion of the cell, or ectoplasm, is distinct and is filled with many tiny vacuoles, which assist in flotation. A few contractile vacuoles around the periphery of the cell expel excess water, and are visible as clear bulges when full. Actinophrys sol, a common heliozoan. ...
Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ...
[[{{{diversity_link}}}|Diversity]] {{{diversity}}} Binomial name {{{binomial}}} Trinomial name {{{trinomial}}} Type Species {{{type_species}}} Typical phyla Rhodophyta (red algae) Chromista Heterokontophyta (heterokonts) Haptophyta Cryptophyta (cryptomonads) Alveolates Dinoflagellata Apicomplexa Ciliophora (ciliates) Excavates Euglenozoa Percolozoa Metamonada Rhizaria Radiolaria Foraminifera Cercozoa Amoebozoa Choanozoa Many others; classification varies [[Image:{{{range_map}}}|{{{range_map_width}}}|]] Synonyms {{{synonyms}}} Protists are definitely...
Typical classes Colored groups Chrysophyceae (golden algae) Synurophyceae Actinochrysophyceae (axodines) Pelagophyceae Phaeothamniophyceae Bacillariophyceae (diatoms) Raphidophyceae Eustigmatophyceae Xanthophyceae (yellow-green algae) Phaeophyceae (brown algae) Colorless groups Oomycetes (water moulds) Hypochytridiomycetes Bicosoecea Labyrinthulomycetes (slime nets) Opalinea Proteromonadea The heterokonts or stramenopiles are a major line of eukaryotes. ...
The axodines are a group of unicellular heterokont algae. ...
Hartmann von Aue Eduard Hartmann, Austrian politician (1904 - 1966) Eduard Von Hartmann Elly Hartmann Emil Hartmann, composer (1836-1898), son of Johann Peter Emilius Hartmann Erich Hartmann (1922-1993) Felix Cardinal von Hartmann Gustav Hartmann, Berlin cabman, known as The Iron Gustav (1859-1938) Juan Hartmann, Argentinian astronomer Johann Peter...
Heliozoa, or sun animalcules, are roughly spherical amoeboids with many stiff, microtubule-supported projections called axopods radiating outward from the cell surface. ...
Vacuoles are large membrane-bound compartments within some eukaryotic cells where they serve a variety of different functions: capturing food materials or unwanted structural debris surrounding the cell, sequestering materials that might be toxic to the cell, maintaining fluid balance (called turgor) within the cell, exporting unwanted substances from the...
There are two genera included here. Actinophrys have a single, central nucleus. Most are around 40-50 μm in diameter, with axopods up to 100 μm in length, though this varies. Actinosphaerium are several times larger, from 200-1000 μm in diameter, with many nuclei, and are found exclusively in fresh water. Two other genera, Echinosphaerium and Camptonema, have been described but appear to be synonyms. To help compare different orders of magnitude this page lists lengths between 10 micrometre and 100 micrometre (10-5 m and 10-4 m). ...
(Redirected from 1 E 4 m) To help compare different orders of magnitude this page lists lengths between 10 and 100 km (104 to 105 m). ...
Reproduction takes place by fission, with open mitosis. Under unfavourable conditions, the organism will form a cyst, which is multi-walled and covered in spikes. While encysted it may undergo a peculiar process of autogamy or self-fertilization, where it goes through meiosis and divides to form two gametes, which then fuse together again. This is the only form of sexual reproduction that occurs within the group, though it is really more genetic reorganization than reproduction. Light micrograph of a newt lung cell in early anaphase of mitosis. ...
Self-fertilization (also known as autogamy) occurs in hermaphroditic organisms where the two gametes fused in fertilization come from the same individual. ...
For the article on the figure of speech, see meiosis (figure of speech). ...
Sexual reproduction is a type of reproduction that results in increasing genetic diversity of the offspring. ...
The axopods are supported by microtubules arranged in a unique and characteristic double-coil pattern. In Actinophrys, these arise from the nuclear membrane, while in Actinosphaerium some do and others don't. Other heliozoa where the microtubules arise from the nucleus have been considered possible relatives, and it now appears that the actinophryids developed from axodines such as Pedinella. These are specialized heterokont algae, related to golden algae, diatoms, brown algae, and the like, which have microtubule-supported tentacles. This article is in need of attention from an expert on the subject. ...
The axodines are a group of unicellular heterokont algae. ...
Typical classes Colored groups Chrysophyceae (golden algae) Synurophyceae Actinochrysophyceae (axodines) Pelagophyceae Phaeothamniophyceae Bacillariophyceae (diatoms) Raphidophyceae Eustigmatophyceae Xanthophyceae (yellow-green algae) Phaeophyceae (brown algae) Colorless groups Oomycetes (water moulds) Hypochytridiomycetes Bicosoecea Labyrinthulomycetes (slime nets) Opalinea Proteromonadea The heterokonts or stramenopiles are a major line of eukaryotes. ...
The golden algae or chrysophytes are a large group of heterokont algae, found mostly in freshwater. ...
Diatoms are a major group of eukaryotic algae, and are one of the most common types of phytoplankton. ...
Orders Ascoseirales Chordariales Cutleriales Desmarestiales Dictyosiphonales Dictyotales Ectocarpales Fucales Laminariales (kelps) Scytosiphonales Scytothamnales Sphacelariales Sporochnales Syringodermatales Tilopteridales The brown algae or phaeophytes are a large group of multicellular algae, including many notable seaweeds. ...
As far as the diet of the Actinophyrys goes, the protist feeds on small flagellates, diminutive cilates, microscopic algae, etc.
|
Feeds |
Contact