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Treubaria Setigera
''Treubaria'' is a genus of microscopic green algae, the sole genus in the family Treubariaceae. ''Treubaria'' is found in freshwater habitats and has a cosmopolitan distribution. The genus was circumscribed by Charles Jean Bernard in Protococ. Desmid. Eau Douce 5–6, 12, 169 in 1908. The genus name of ''Treubaria'' is in honour of Melchior Treub (1851–1910), who was a Dutch botanist. He worked at the Bogor Botanical Gardens in Buitenzorg on the island of Java, south of Batavia, Dutch East Indies, gaining renown for his work on tropical flora. Description ''Treubaria'' consists of single cells that are planktonic. The protoplast is 5–22 μm in diameter, spherical to multi-lobed, with 3–4 (sometimes up to 20) hollow, conical or tubular spines (up to 83 μm long) radiating from the cells. Cells are uninucleate when young, but have up to four or five nuclei when mature. They have one chloroplast when young; chloroplasts have one (or multiple) pyrenoids. ''Treubaria'' repr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. Phylogeneti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asexual Reproduction
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 eubacteria, bacteria. Many Eukaryote, eukaryotic organisms including plants, animals, and Fungus, fungi can also reproduce asexually. In Vertebrate, 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. Some Monitor lizard, monitor lizards, including Komodo dragons, can reproduce asexually. While all prokaryotes reproduce without the fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Treubaria Quadrispina
''Treubaria'' is a genus of microscopic green algae, the sole genus in the family Treubariaceae. ''Treubaria'' is found in freshwater habitats and has a cosmopolitan distribution. The genus was circumscribed by Charles Jean Bernard in Protococ. Desmid. Eau Douce 5–6, 12, 169 in 1908. The genus name of ''Treubaria'' is in honour of Melchior Treub (1851–1910), who was a Dutch botanist. He worked at the Bogor Botanical Gardens in Buitenzorg on the island of Java, south of Batavia, Dutch East Indies, gaining renown for his work on tropical flora. Description ''Treubaria'' consists of single cells that are planktonic. The protoplast is 5–22 μm in diameter, spherical to multi-lobed, with 3–4 (sometimes up to 20) hollow, conical or tubular spines (up to 83 μm long) radiating from the cells. Cells are uninucleate when young, but have up to four or five nuclei when mature. They have one chloroplast when young; chloroplasts have one (or multiple) pyrenoids. ''Treubaria'' repr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WoRMS
The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive catalogue and list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialists on each group of organism. These taxonomists control the quality of the information, which is gathered from the primary scientific literature as well as from some external regional and taxon-specific databases. WoRMS maintains valid names of all marine organisms, but also provides information on synonyms and invalid names. It is an ongoing task to maintain the registry, since new species are constantly being discovered and described by scientists; in addition, the nomenclature and taxonomy of existing species is often corrected or changed as new research is constantly being published. Subsets of WoRMS content are made available, and can have separate badging and their own home/launch pages, as "subregisters", such as the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultrastructural
Ultrastructure (or ultra-structure) is the architecture of cells and biomaterials that is visible at higher magnifications than found on a standard optical light microscope. This traditionally meant the resolution and magnification range of a conventional transmission electron microscope (TEM) when viewing biological specimens such as cells, tissue, or organs. Ultrastructure can also be viewed with scanning electron microscopy and super-resolution microscopy, although TEM is a standard histology technique for viewing ultrastructure. Such cellular structures as organelles, which allow the cell to function properly within its specified environment, can be examined at the ultrastructural level. Ultrastructure, along with molecular phylogeny, is a reliable phylogenetic way of classifying organisms. Features of ultrastructure are used industrially to control material properties and promote biocompatibility. History In 1931, German engineers Max Knoll and Ernst Ruska invented the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochiscia
''Trochiscia'' is a genus of green algae in the family Oocystaceae. It is found in the plankton of freshwater habitats. The name ''Trochiscia'' was used in 1834 by Friedrich Traugott Kützing. Description ''Trochiscia'' consists of solitary, spherical cells up to 50 μm in diameter. The cell walls are thick, and are variously sculptured with spines, ribs, reticulations, and or projections. Cells are uninucleate (one nucleus). The single chloroplast is variable in morphology, and may be stellate and axial or parietal, and may have or lack a pyrenoid. Asexual reproduction occurs by the formation of autospores or zoospores; sexual reproduction has not been observed. Species of ''Trochiscia'' are distinguished based on details of cell morphology, particularly the sculpturing of the cell wall. Taxonomy The taxonomy of ''Trochiscia'' is very unclear and in need of revision. The name ''Trochiscia'' was described twice by Kützing. His first description was in 1834, referring to a broad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elakatothrix
''Elakatothrix'' is a genus of green algae in the class Klebsormidiophyceae. Etymology Genus name ''Elakatothrix'' is composed of elakato- prefix, "spindle", and –thrix suffix, "thread", literally "spindle thread",Phycokey-Elakatothrix read on line/ref> in reference to the tapered shape of individual cell of the colonial algae. List of species * ''E. auae'' Setchell 1924 * ''E. acuta'' Pascher 1915 * ''E. alpina'' Beck-Mannagetta 1926 * ''E. americana'' Wille 1899 * ''E. arvernensis'' Chodat & Chodat 1925 * ''E. bifurcata'' Kant & Gupta 1998 * ''E. biplex'' (Nygaard 1945) Hindák 1962 * ''E. gelatinosa'' Wille 1898 * ''E. gelifacta'' (Chodat 1902) Hindák 1987 * ''E. genevensis'' (Reverdin 1919) Hindák 1962 * ''E. gloeocystiformis'' Korshikov 1953 * ''E. gracilis'' Hortobagyi 1973 * ''E. inflexa'' Hindák 1966 * ''E. lacustris'' Korshikov 1953 non Beck-Mannagetta 1931 * ''E. linearis'' Pascher 1915 * ''E. minima'' Beck-Mannagetta 1929 * ''E. obtusata'' Flechtner, Johansen & ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylindrocapsa
''Cylindrocapsa'' is a genus of green algae, specifically of the Chlorophyceae. It is commonly found in freshwater habitats. Virus-like particles have been found in a strain of one species, '' Cylindrocapsa geminella''. Description ''Cylindrocapsa'' consists of unbranched filaments, often attached to substrates or free-floating in water. Cells are initially uniseriate (that is, in one line), but may later become multi-seriate or irregularly arranged. Individual cells are ovoid to oblong to spherical, and are each surrounded by several concentric layers of a mucilaginous sheath. Cells contain a single chloroplast filling the cell, with a single pyrenoid. The chloroplast may be axial (in the middle of the cell) or parietal (lining the wall of the cell). Taxonomy The placement of ''Cylindrocapsa'' is unclear. Species differ significantly from each other, both in terms of morphology and ultrastructure. It is therefore suspected to be polyphyletic A polyphyletic group is an assem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phylogenetic
In biology, phylogenetics () is the study of the evolutionary history of life using observable characteristics of organisms (or genes), which is known as phylogenetic inference. It infers the relationship among organisms based on empirical data and observed heritable traits of DNA sequences, protein amino acid sequences, and morphology. The results are a phylogenetic tree—a diagram depicting the hypothetical relationships among the organisms, reflecting their inferred evolutionary history. The tips of a phylogenetic tree represent the observed entities, which can be living taxa or fossils. A phylogenetic diagram can be rooted or unrooted. A rooted tree diagram indicates the hypothetical common ancestor of the taxa represented on the tree. An unrooted tree diagram (a network) makes no assumption about directionality of character state transformation, and does not show the origin or "root" of the taxa in question. In addition to their use for inferring phylogenetic pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
