| Polyarthra | |
|---|---|
 | |
| Polyarthra | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Rotifera |
| Class: | Monogononta |
| Order: | Ploima |
| Family: | Synchaetidae |
| Genus: | Polyarthra Ehrenberg, 1834 |
Polyarthra is a genus of rotifers belonging to the family Synchaetidae. [1]
The genus has almost cosmopolitan distribution. [1]
Species: [1]
Asexual reproduction is a type of reproduction that does not involve the fusion of gametes or change in the number of chromosomes. The offspring that arise by asexual reproduction from either unicellular or multicellular organisms inherit the full set of genes of their single parent and thus the newly created individual is genetically and physically similar to the parent or an exact clone of the parent. Asexual reproduction is the primary form of reproduction for single-celled organisms such as archaea and bacteria. Many eukaryotic organisms including plants, animals, and fungi can also reproduce asexually. In vertebrates, the most common form of asexual reproduction is parthenogenesis, which is typically used as an alternative to sexual reproduction in times when reproductive opportunities are limited. Komodo dragons and some monitor lizards can reproduce asexually.
The rotifers, commonly called wheel animals or wheel animalcules, make up a phylum of microscopic and near-microscopic pseudocoelomate animals.
Bdelloidea is a class of rotifers found in freshwater habitats all over the world. There are over 450 described species of bdelloid rotifers, distinguished from each other mainly on the basis of morphology. The main characteristics that distinguish bdelloids from related groups of rotifers are exclusively parthenogenetic reproduction and the ability to survive in dry, harsh environments by entering a state of desiccation-induced dormancy (anhydrobiosis) at any life stage. They are often referred to as "ancient asexuals" due to their unique asexual history that spans back to over 25 million years ago through fossil evidence. Bdelloid rotifers are microscopic organisms, typically between 150 and 700 µm in length. Most are slightly too small to be seen with the naked eye, but appear as tiny white dots through even a weak hand lens, especially in bright light. In June 2021, biologists reported the restoration of bdelloid rotifers after being frozen for 24,000 years in the Siberian permafrost.
Monogononta is a class of rotifers, found mostly in freshwater but also in soil and marine environments. They include both free-swimming and sessile forms. Monogononts generally have a reduced corona, and each individual has a single gonad, which gives the group its name. Males are generally smaller than females, and are produced only during certain times of the year, with females otherwise reproducing through parthenogenesis.
A cercaria is the larval form of the trematode class of parasites. It develops within the germinal cells of the sporocyst or redia. A cercaria has a tapering head with large penetration glands. It may or may not have a long swimming "tail", depending on the species. The motile cercaria finds and settles in a host where it will become either an adult, or a mesocercaria, or a metacercaria, according to species.
Pompholyx may refer to:
Rotaria is a genus of asexual, microscopic animal known as a bdelloid rotifer. Analysis published in 2007 of morphology and DNA sequence data of species from the genus confirmed that despite their asexual mechanism of reproduction, two fundamental properties of species, independent evolution and ecological divergence by natural selection occurred. This demonstrates that sex is not a necessary condition for speciation.
Brachionus is a genus of planktonic rotifers occurring in freshwater, alkaline and brackish water.
Syndermata is a clade of animals that, in some systems, is considered synonymous with Rotifera. Older systems separate Rotifera and Acanthocephala as different phyla, and group them both under Syndermata. This clade is placed in the Platyzoa.
Gnathifera is a clade of generally small spiralians characterized by complex jaws made of chitin. It comprises the phyla Gnathostomulida, Rotifera, Micrognathozoa, and Chaetognatha. It may also include the Cycliophora.
Lake Harihari is a dune-dammed lake 10 km south of Kawhia in the Waikato region of New Zealand. Its water quality is the best amongst the Waikato dune lakes. It is ranked eighth in importance in the region. Its quality has been attributed to its remoteness.
Synchaeta is a genus of rotifers belonging to the family Synchaetidae.
Cephalodella is a genus of rotifers in the family Notommatidae.
Habrotrocha is a genus of bdelloid rotifers.
Longipedia is a genus of marine copepods of the family Longipediidae, order Canuelloida.
The Maribor Island is the name of a natural island on the Drava river near the town of Maribor, in the region of Lower Styria of the European country of Slovenia. In 1951 it was protected as a natural heritage, and today it has the condition of natural geomorphological and botanical monument. At the same time it is an important habitat for animal species, especially birds. Access to the island is possible thanks to a picturesque path that leads along the left bank of the Drava past the bay of Koblarjev.
Lindia is a genus of rotifers belonging to the family Lindiidae.
Euchlanis is a genus of rotifers belonging to the family Euchlanidae.
Longipediidae is a family of copepods belonging to the order Polyarthra. It contains a single genus.
Epiphanes is a genus of rotifers belonging to the family Epiphanidae.
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