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Potamodrilidae
Potamodrilidae is a family of Meiofauna, meiofaunal annelids, Monotypic taxon, monotypically containing only the genus ''Potamodrilus''. Potamodrialidae is the sister group to Aeolosomatidae, by all accounts. Beyond that, its Phylogenetics, phylogenetic position is uncertain. The species of this genus are found in Europe. Species: * ''Potamodrilus fluviatilus'' (Lastockin, 1935) * ''Potamodrilus rivularis'' Lastočkin, 1935 References Further reading * Protostome enigmatic taxa Annelids {{annelid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potamodrilus Fluviatilus
Potamodrilidae is a family of Meiofauna, meiofaunal annelids, Monotypic taxon, monotypically containing only the genus ''Potamodrilus''. Potamodrialidae is the sister group to Aeolosomatidae, by all accounts. Beyond that, its Phylogenetics, phylogenetic position is uncertain. The species of this genus are found in Europe. Species: * ''Potamodrilus fluviatilus'' (Lastockin, 1935) * ''Potamodrilus rivularis'' Lastočkin, 1935 References Further reading * Protostome enigmatic taxa Annelids {{annelid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potamodrilus Rivularis
Potamodrilidae is a family of meiofaunal annelids, monotypically containing only the genus ''Potamodrilus''. Potamodrialidae is the sister group to Aeolosomatidae, by all accounts. Beyond that, its phylogenetic position is uncertain. The species of this genus are found in Europe. Species: * ''Potamodrilus fluviatilus Potamodrilidae is a family of Meiofauna, meiofaunal annelids, Monotypic taxon, monotypically containing only the genus ''Potamodrilus''. Potamodrialidae is the sister group to Aeolosomatidae, by all accounts. Beyond that, its Phylogenetics, phyloge ...'' (Lastockin, 1935) * '' Potamodrilus rivularis'' Lastočkin, 1935 References Further reading * Protostome enigmatic taxa Annelids {{annelid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meiofauna
Meiobenthos, also called meiofauna, are small benthic invertebrates that live in both marine and fresh water environments. The term ''meiofauna'' loosely defines a group of organisms by their size, larger than microfauna but smaller than macrofauna, rather than a taxonomic grouping. In practice, that is organisms that can pass through a 1 mm mesh but will be retained by a 45 μm mesh, but the exact dimensions will vary from researcher to researcher. Whether an organism will pass through a 1 mm mesh will also depend upon whether it is alive or dead at the time of sorting. The term ''meiobenthos'' was first coined in 1942 by Mare, but organisms that would fit into the meiofauna category have been studied since the 18th century. A comprehensive text on meiofauna is ''Introduction to the study of meiofauna'' by Higgins and Thiel (1988). Meiofaunal taxa File:Ammonia tepida.jpg, Live foraminifera ''Ammonia tepida'' (Rotaliida) File:Waterbear.jpg, Water bear ''Hypsi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotypic Taxon
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. In contrast, an oligotypic taxon contains more than one but only a very few subordinate taxa. Examples Just as the term ''monotypic'' is used to describe a taxon including only one subdivision, the contained taxon can also be referred to as monotypic within the higher-level taxon, e.g. a genus monotypic within a family. Some examples of monotypic groups are: Plants * In the order Amborellales, there is only one family, Amborellaceae and there is only one genus, '' Amborella'', and in this genus there is only one species, namely ''Amborella trichopoda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aeolosomatidae
The Aeolosomatidae is a family of very small, aquatic annelid worms, between 0.3 and 10 mm in length and 0.04-0.06 mm in diameter. About 30 species have been described in three genera. These worms are known as suction-feeding worms and occupy freshwater, brackish, and saltwater habitats. They are bottom and sediment dwellers, inhabiting spaces around aquatic plants and the detritus-rich sands and sediments of freshwater habitats (microfauna) Ecology Aeolosomatids feed on microalgae, microorganisms, and detritus. They place their prostomia over the substrate and create a vacuum, swallowing small particles and their attached algae. They are able to reproduce sexually, but most reproduction is asexual. This is done by paratomy Paratomy is a form of asexual reproduction in animals where the organism splits in a plane perpendicular to the antero-posterior axis and the split is preceded by the "pregeneration" of the anterior structures in the posterior portion. The developi .../fissio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phylogenetics
In biology, phylogenetics (; from Greek language, Greek wikt:φυλή, φυλή/wikt:φῦλον, φῦλον [] "tribe, clan, race", and wikt:γενετικός, γενετικός [] "origin, source, birth") is the study of the evolutionary history and relationships among or within groups of organisms. These relationships are determined by Computational phylogenetics, phylogenetic inference methods that focus on observed heritable traits, such as DNA sequences, Protein, protein Amino acid, amino acid sequences, or Morphology (biology), morphology. The result of such an analysis is a phylogenetic tree—a diagram containing a hypothesis of relationships that reflects the evolutionary history of a group of organisms. The tips of a phylogenetic tree can be living taxa or fossils, and represent the "end" or the present time in an evolutionary lineage. A phylogenetic diagram can be rooted or unrooted. A rooted tree diagram indicates the hypothetical common ancestor of the tree. An un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protostome Enigmatic Taxa
Protostomia () is the clade of animals once thought to be characterized by the formation of the organism's mouth before its anus during embryonic development. This nature has since been discovered to be extremely variable among Protostomia's members, although the reverse is typically true of its sister clade, Deuterostomia. Well known examples of protostomes are arthropods, molluscs, annelids, flatworms and nematodes. They are also called schizocoelomates since schizocoely typically occurs in them. Together with the Deuterostomia and Xenacoelomorpha, these form the clade Bilateria, animals with bilateral symmetry, anteroposterior axis and three germ layers. Protostomy In animals at least as complex as earthworms, the first phase in gut development involves the embryo forming a dent on one side (the blastopore) which deepens to become its digestive tube (the archenteron). In the sister-clade, the deuterostomes (), the original dent becomes the anus while the gut e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
