|
Didangiidae
''Didangia'' is a genus of flatworms belonging to the order Polycladida. It is the only genus in the monotypic 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 "unisp ... family Didangiidae. Species There are two species recognised in the genus ''Didangia'': * '' Didangia carneyi'' Quiroga, Bolanos & Litvaitis, 2008 * '' Didangia mactanensis'' Faubel, 1983 References {{Taxonbar, from1=Q18607063, from2=Q21293774 Platyhelminthes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Didangia Carneyi
''Didangia carneyi'' is a species of aquatic flatworm belonging to the family Didangiidae. It is found in the Gulf of Mexico. Description ''D. carneyi'' is ovoid in shape, around 1.4–2.2 mm in length. When preserved, the dorsum is a whitish color with brown to pink pigment, which is more concentrated in the pharynx region. It is possible that the species could be pink in life. Brown dots are present radially from the pharynx. The ventral surface is a cream-whitish color; the uteri are visible as two dark lines on each side of the pharynx.Quiroga, S. Y.; Bolanos, M.; Litvaitis, M. K. (2008). Two new species of flatworms (Platyhelminthes: Polycladida) from the continental slope of the Gulf of Mexico. ''Journal of the Marine Biological Association of the United Kingdom'', 88(7): 1363-1370. ''D. carneyi'' is further distinguished by the orientation of its two accessory prostatic vesicles, which each bear a stylet; additionally, the stylets merge to form a copulatory organ. Ad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flatworms
Platyhelminthes (from the Greek πλατύ, ''platy'', meaning "flat" and ἕλμινς (root: ἑλμινθ-), ''helminth-'', meaning "worm") is a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates commonly called flatworms or flat worms. Being acoelomates (having no body cavity), and having no specialised circulatory and respiratory organs, they are restricted to having flattened shapes that allow oxygen and nutrients to pass through their bodies by diffusion. The digestive cavity has only one opening for both ingestion (intake of nutrients) and egestion (removal of undigested wastes); as a result, the food can not be processed continuously. In traditional medicinal texts, Platyhelminthes are divided into Turbellaria, which are mostly non- parasitic animals such as planarians, and three entirely parasitic groups: Cestoda, Trematoda and Monogenea; however, since the turbellarians have since been proven not to be monophyletic, this classifica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polycladida
The Polycladida represents a highly diverse clade of free-living marine flatworms. They are known from the littoral to the sublittoral zone (extending to the deep hot vents), and many species are common from coral reefs. Only a few species are found in freshwater habitats. Description Polyclads range from to in length with a flattened, roughly oval, body shape and, in many cases, a pair of short tentacles on the head. They are distinguished from other related animals by the presence of a folded pharynx, an elongated intestine with numerous complex diverticula, and multiple ocelli. The etymology of the order name ''Polycladida'' corresponds to the two ancient Greek words (), meaning "numerous", and (), meaning "branch". It refers to the ramified shape of the intestine in these flatworms. Most polyclads hide away from direct light. However, some of the brightly colored species often are active during the day. With their flamboyant coloring they advertise their potential tox ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotypic
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. Theoretical implications Monotypic taxa present several important theoretical challenges in biological classification. One key issue is known as "Gregg's Paradox": if a single species is the only member of multiple hierarchical levels (for example, being the only species in its genus, which is the only genus in its family), then each level needs a distinct definition to maintain logical structure. Otherwise, the different taxonomic ranks become effectively identical, which creates problems for organizing biological diversity in a hierarchical syste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
