Actinastrum

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Actinastrum
Actinastrumhantzii EPA.jpg
Actinastrum hantzschii
Scientific classification OOjs UI icon edit-ltr.svg
Clade: Viridiplantae
Division: Chlorophyta
Class: Trebouxiophyceae
Order: Chlorellales
Family: Chlorellaceae
Genus: Actinastrum
Lagerheim, 1882
Type species
Actinastrum hantzschii
Lagerheim
Species

Actinastrum is a genus of mostly freshwater single-celled Eukaryotes, first described by Gustaf Lagerheim in 1882. [1]

Studies since 2002 have placed Actinastrum as either sister to or a subgrouping within Chlorella , a chlorophyte green alga genus in the family Chlorellaceae. [2] [3]

Related Research Articles

<span class="mw-page-title-main">Chlorophyta</span> Phylum of green algae

Chlorophyta is a division of green algae informally called chlorophytes.

<i>Chlorella</i> Genus of green algae

Chlorella is a genus of about thirteen species of single-celled green algae of the division Chlorophyta. The cells are spherical in shape, about 2 to 10 μm in diameter, and are without flagella. Their chloroplasts contain the green photosynthetic pigments chlorophyll-a and -b. In ideal conditions cells of Chlorella multiply rapidly, requiring only carbon dioxide, water, sunlight, and a small amount of minerals to reproduce.

Zoochlorella is a coloquial term for any green algae that lives symbiotically within the body of an aquatic invertebrate animal or a protozoan.

<span class="mw-page-title-main">Trebouxiophyceae</span> Class of algae

The Trebouxiophyceae are a class of green algae, in the division Chlorophyta. Their circumscription within the green algae is not well established due to the need for more genetic studies at higher levels within the group.

<span class="mw-page-title-main">Selenastraceae</span> Family of algae

Selenastraceae is a family of green algae in the order Sphaeropleales. Members of this family are common components of the phytoplankton in freshwater habitats worldwide. A few species have been found in brackish and marine habitats, such as in the Baltic Sea.

<i>Dictyosphaerium</i> Genus of algae

Dictyosphaerium is a genus of green algae, in the family Chlorellaceae. It occurs in freshwater habitats around the world and is planktonic.

<i>Lagerheimia</i> Genus of algae

Lagerheimia is a genus of green algae in the family Oocystaceae. It is commonly found in freshwater habitats all over the world, although some species are rare and have only been recorded from Europe or the United States.

<i>Micractinium</i> Genus of algae

Micractinium is a genus of green algae in the family Chlorellaceae. Species of the genus Micractinium are common in freshwater habitats. A few species are found as endosymbionts of protozoa, such as Micractinium conductrix and Micractinium tetrahymenae.

<i>Prototheca</i> Genus of algae

Prototheca is a genus of algae in the family Chlorellaceae. While this genus is a member of the green algae, all Prototheca no longer have chloroplasts and therefore their photosynthetic ability. Some species can cause protothecosis in humans and various vertebrates.

Dictyochloropsis reticulata is a species of green alga in the Trebouxiales. It is a known as a photobiont with several lichen species, like Lobaria pulmonaria, but also as a free-living soil alga as well. Phylogenetic analysis of rRNA sequence data revealed that the species shares a sister group relationship with two other green algae that lack motile stages, Chlorella saccharophila and C. luteoviridis.

<span class="mw-page-title-main">Klebsormidiaceae</span> Family of algae

The Klebsormidiaceae are a family containing five genera of charophyte green alga forming multicellular, non-branching filaments. The genus Chlorokybus was previously included as well, but this problematic and poorly known genus is now placed in a separate class Chlorokybophyceae.

<i>Raphidonema</i> (alga) Genus of algae

Raphidonema is a genus of filamentous green alga comprising five species. It is a member of the Trebouxiophyceae.

<span class="mw-page-title-main">Autospore</span>

Autospores are a type of spores that are produced by algae to enable asexual reproduction and spread. They are non-motile and non-flagellated aplanospores that are generated within a parent cell and have the same shape as the parent cell before their release. Autospores are also known as resting spores. Algae primarily use three different types of spores for asexual reproduction - autospores, zoospores, and aplanospores. Autospores occur in several groups of algae, including Eustigmatophyceae, Dinoflagellates, and green algae. One example of a colonial alga that produces autospores is Dichotomococcus. This alga generates two autospores per reproducing cell, and the autospores escape through a slit in the cell wall and remain attached to the mother cell. Some study on autospores and algae in general include looking into its use for biofuel, animal feed, food supplements, nutraceuticals, and pharmaceuticals.

Chlorella volutis is a species of euryhaline, unicellular microalga in the Division Chlorophyta. It is spherical to oval-shaped, is solitary and lacks a mucilaginous envelope.

Chlorella rotunda is a euryhaline, unicellular microalga in the Division Chlorophyta. It is spherical to oval-shaped, is solitary and lacks a mucilaginous envelope.

Chlorella lewinii is a euryhaline, unicellular microalga in the Division Chlorophyta. It is spherical to oval-shaped, is solitary and lacks a mucilaginous envelope.

Chlorella pulchelloides is a species of euryhaline, unicellular microalga in the Division Chlorophyta. It is spherical to oval-shaped and is solitary

Chlorella pituita is a species of euryhaline, unicellular microalga in the Division Chlorophyta. It is spherical to oval-shaped and is solitary

Chlorella coloniales is a euryhaline, unicellular microalga in the Division Chlorophyta. It is spherical to oval-shaped and is solitary

Chlorellosis is a disease caused by the infection of Chlorella, a type of microalgae containing large amount of chloroplasts. It is mainly found in sheep and cattle, while cases in humans, dogs, antelopes, beavers, camels and fish, were also reported. Symptoms of Chlorellosis including focal cutaneous lesions, lymphadenitis, and peritonitis.

References

  1. Gustaf Lagerheim (February 1882). "Bidrag till kännedomen om Stockholmstraktens Pediastréer, Protococcacéer och Palmellacéer". Öfversigt af Kongl. Vetenskaps-Akademiens Förhandlingar. 39 (2): 47–81.
  2. Wolf M, Kreinitz L, Hepperle D (April 2002). "Phylogenetic position of Actinastrum hantzschii LAGERHEIM 1 882 (Chlorophyta, Trebouxiophyceae)". Algological Studies. 104: 59–67. doi:10.1127/algol_stud/104/2002/59.
  3. Luo W, Proeschold T, Bock C, Krienitz L (April 2010). "Generic concept in Chlorella‐related coccoid green algae (Chlorophyta, Trebouxiophyceae)". Plant Biology. 12 (3): 545–553. doi:10.1111/j.1438-8677.2009.00221.x. PMID   20522192.