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Eyespot (flatworm)
Eyespot can mean: Visual features * Eyespot (mimicry), a color mark that looks somewhat like an eye * Eyespot, a sensory organ of invertebrates; see simple eye in invertebrates * Eyespot, a type of eye in some gastropods, a part of sensory organs of gastropods * Eyespot apparatus, a photoreceptive organelle found in the flagellate (motile) cells unicellular photosynthetic organisms Diseases * Eyespot (wheat), a disease of wheat. * Groundnut eyespot virus, a plant pathogenic virus Fish species * Eyespot gourami ('' Parasphaerichthys ocellatus'') * Eyespot puffer (''Tetraodon biocellatus'') * Eyespot skate (''Atlantoraja cyclophora'') Reptile species * Eyespot gecko (''Gonatodes ocellatus'') See also * Floaters Floaters or eye floaters are sometimes visible deposits (e.g., the shadows of tiny structures of protein or other cell debris projected onto the retina) within the eye's vitreous humour ("the vitreous"), which is normally transparent, or between ... {{disambig [Baidu] |
Eyespot (mimicry)
An eyespot (sometimes ocellus) is an eye-like marking. They are found in butterflies, reptiles, cats, birds and fish. Eyespots could be explained in at least three different ways. They may be a form of mimicry in which a spot on the body of an animal resembles an eye of a different animal, to deceive potential predator or prey species. They may be a form of self-mimicry, to draw a predator's attention away from the prey's most vulnerable body parts. Or they may serve to make the prey appear inedible or dangerous. Eyespot markings may play a role in intraspecies communication or courtship; the best-known example is probably the eyespots on a peacock's display feathers. The pattern-forming biological process (morphogenesis) of eyespots in a wide variety of animals is controlled by a small number of genes active in embryonic development, including the genes called Engrailed, Distal-less, Hedgehog, Antennapedia, and the Notch signaling pathway. Artificial eyespots have been show ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Simple Eye In Invertebrates
A simple eye (sometimes called a pigment pit) refers to a form of eye or an optical arrangement composed of a single lens and without an elaborate retina such as occurs in most vertebrates. In this sense "simple eye" is distinct from a multi-lensed "compound eye", and is not necessarily at all simple in the usual sense of the word. The structure of an animal's eye is determined by the environment in which it lives, and the behavioural tasks it must fulfill to survive. Arthropods differ widely in the habitats in which they live, as well as their visual requirements for finding food or conspecifics, and avoiding predators. Consequently, an enormous variety of eye types are found in arthropods. They possess a wide variety of novel solutions to overcome visual problems or limitations. Use of the term ''simple eye'' is flexible, and must be interpreted in proper context; for example, the eyes of humans and of other large animals such as most cephalopods, are '' camera eyes'' and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sensory Organs Of Gastropods
The sensory organs of gastropods (snails and slugs) include olfactory organs, eyes, statocysts and mechanoreceptors. Gastropods have no sense of hearing.Chase R.: ''Sensory Organs and the Nervous System''. in Barker G. M. (ed.): ''The biology of terrestrial molluscs''. CABI Publishing, Oxon, UK, 2001, . 1–146, cited pages: 179–211. Olfactory organs In terrestrial gastropods the most important sensory organs are the olfactory organs which are located on the tips of the 4 tentacles. Some terrestrial gastropods can track the odor of food using their tentacles (tropotaxis) and the wind (anemotaxis). In opisthobranch marine gastropods, the chemosensory organs are two protruding structures on top of the head. These are known as rhinophores. An opisthobranch sea slug ''Navanax inermis'' has chemoreceptors on the sides of its mouth to track mucopolysaccharides in the slime trails of prey, and of potential mates. The freshwater snail ''Bithynia tentaculata'' is capable of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eyespot Apparatus
The eyespot apparatus (or '' stigma'') is a photoreceptive organelle found in the flagellate or (motile) cells of green algae and other unicellular photosynthetic organisms such as euglenids. It allows the cells to sense light direction and intensity and respond to it, prompting the organism to either swim towards the light (positive phototaxis), or away from it (negative phototaxis). A related response ("photoshock" or photophobic response) occurs when cells are briefly exposed to high light intensity, causing the cell to stop, briefly swim backwards, then change swimming direction. Eyespot-mediated light perception helps the cells in finding an environment with optimal light conditions for photosynthesis. Eyespots are the simplest and most common "eyes" found in nature, composed of photoreceptors and areas of bright orange-red red pigment granules. Signals relayed from the eyespot photoreceptors result in alteration of the beating pattern of the flagella, generating a phot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eyespot (wheat)
Eyespot is an important fungal disease of wheat caused by the necrotrophic fungus Tapesia yallundae (syn: ''Pseudocercosporella herpotrichoides''; W-type namorph ''Oculimacula yallundae'') and Tapesia acuformis (syn: ''Pseudocercosporella herpotrichoides''; R-type namorph ''Oculimacula acuformis''). It is also called Strawbreaker. Eyespot is more severe where wheat is grown continuously and when the weather is cool and moist. Treating crops against eyespot with fungicide costs millions to farmers and is complicated by the pathogen becoming resistant to the more commonly used fungicides. Severe cases of the disease can reduce yield by up to 40%. It is most common in temperate regions such as North and South America, Europe, Australia, New Zealand and Africa.Hollmann, M. (n.d.). Eyespot of Wheat, Retrieved October 27, 2007, fro/ref> Symptoms The eye-shaped elliptical lesions which give eyespot its name form on lower stem bases near to the soil surface. The lesions are straw yel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Groundnut Eyespot Virus
Groundnut may refer to: * Seeds that ripen underground, of the following plants, all in the Faboideae subfamily of the legumes: ** ''Best Basketball Player'', Obinna Udunni ** ''Arachis villosulicarpa'', a perennial peanut species ** '' Vigna subterranea'', the Bambara groundnut ** '' Macrotyloma geocarpum'', the African groundnut * Roots and tubers: ** ''Apios americana'', the American groundnut or potato-bean ** '' Conopodium majus'', called the kippernut among many other names ** '' Panax trifolius'', or dwarf ginseng See also * Ground nuts, nuts subjected to grinding * Earthnut (other) Earthnut is a common name for several unrelated plants which produce a subterranean edible seed, fruit or root Earthnut may refer to: * Truffle * Peanut * Roots and tubers: ** ''Lathyrus tuberosus'' ** ''Conopodium majus'' ** ''Bunium persicum ... * Tanganyika groundnut scheme * {{Disambiguation, plant By beanie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasphaerichthys Ocellatus
The eyespot gourami (''Parasphaerichthys ocellatus'') is a species of gourami endemic to Myanmar where it occurs in small, muddy streams and well vegetated shores of lakes. The species reaches 5 cm (2 inches) in standard length Fish measurement is the measuring of individual fish and various parts of their anatomies. These data are used in many areas of ichthyology, including taxonomy and fisheries biology. Overall length * Standard length (SL) is the length of a fish m .... References eyespot gourami Endemic fauna of Myanmar Fish of Myanmar eyespot gourami {{Anabantiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetraodon Biocellatus
''Dichotomyctere ocellatus'' (syn. ''Tetraodon biocellatus''), commonly the figure 8 puffer or eyespot puffer, is a pufferfish found in freshwater in Southeast Asia. It is known from the lower reaches of the Mekong (Cambodia), the Peninsular Malaysia as well as Borneo (Sarawak, Kalimantan). Characteristics Figure 8 puffers grow to about total length (TL). They are colourful fish, with greenish yellow patterns on their backs. These patterns vary greatly from fish to fish, but the markings either side of the caudal fin resemble the number eight, or eye-spots (earning the species another common name as "eyespot puffer"). Figure 8 puffers are relatively peaceful among Tetraodontidae, and have been kept successfully with other fish such as bumblebee gobies and mollies, but as with all pufferfish there is a risk that tankmates will not be tolerated. Like all members of its family, the figure 8 puffer is capable of inflating itself with water or air when stressed or otherwise frigh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eyespot Skate
The eyespot skate (''Atlantoraja cyclophora'') is a species of fish in the family Arhynchobatidae. It is found in Argentina, Brazil, and Uruguay. Its natural habitats are open sea The sea, connected as the world ocean or simply the ocean, is the body of salty water that covers approximately 71% of the Earth's surface. The word sea is also used to denote second-order sections of the sea, such as the Mediterranean Sea, ...s and shallow seas. Sources Atlantoraja Fish described in 1903 Taxonomy articles created by Polbot {{Rajiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eyespot Gecko
The eyespot gecko (''Gonatodes ocellatus'') is a species of lizard Lizards are a widespread group of squamate reptiles, with over 7,000 species, ranging across all continents except Antarctica, as well as most oceanic island chains. The group is paraphyletic since it excludes the snakes and Amphisbaenia alt ... in the Sphaerodactylidae family native to Tobago. References Gonatodes Reptiles described in 1831 Taxa named by John Edward Gray {{Gecko-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
