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Boreomysis Megalops
''Boreomysis'' (from Greek ''Boreas (god), Boreas'', the god of the northern winds, and the genus name ''Mysis'') is a Mysida, mysid crustacean genus, the type of the subfamily Boreomysinae of the family Mysidae. Majority of the species are found in the ocean deep water. Cosmopolitan. 38 species. Description Compared to another genus of the subfamily, ''Neobirsteiniamysis'', the members of the genus ''Boreomysis'' have narrower telson, not expanded in the central part, being always narrower than in the anterior part. Also the eyes are mostly normally developed. Although in certain species the eyes may be reduced to certain extent, they still always possess cornea, unlike in ''Neobirsteiniamysis''. Taxonomy The originally designated type species is ''Boreomysis arctica, Mysis arctica'' Krøyer, 1861. ''Boreomysis'' is one of the most difficult mysid genera, mostly due to considerable variation with age. Classification The species of ''Boreomysis'' are distributed among two subge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Georg Ossian Sars
Prof Georg Ossian Sars HFRSE (20 April 1837 – 9 April 1927) was a Norway, Norwegian marine biology, marine and freshwater biology, freshwater biologist. Life Georg Ossian Sars was born on 20 April 1837 in Kinn (former municipality), Kinn, Norway (now part of Flora, Norway, Flora), the son of Pastor Michael Sars and Maren Sars; the historian Ernst Sars was his elder brother, and the singer and women's skiing pioneer Eva Nansen was his younger sister.Google Translate He grew up in Manger, Norway, Manger, Hordaland, where his father was the local priest. He studied from 1852 to 1854 at Bergen Cathedral School, from 1854 at Oslo Cathedral School, Christiania Cathedral School, and joined the university at Christiana (now the University of Oslo) in 1857. He indulged his interest in natural history while studying medicine; having collected water fleas in local lakes with Wilhelm Lilljeborg's works, he discovered new species, and this resulted in his first scientific publication. Geor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornea
The cornea is the transparency (optics), transparent front part of the eyeball which covers the Iris (anatomy), iris, pupil, and Anterior chamber of eyeball, anterior chamber. Along with the anterior chamber and Lens (anatomy), lens, the cornea Refraction, refracts light, accounting for approximately two-thirds of the eye's total optical power. In humans, the refractive power of the cornea is approximately 43 dioptres. The cornea can be reshaped by surgical procedures such as LASIK. While the cornea contributes most of the eye's focusing power, its Focus (optics), focus is fixed. Accommodation (eye), Accommodation (the refocusing of light to better view near objects) is accomplished by changing the geometry of the lens. Medical terms related to the cornea often start with the prefix "''wikt:kerat-, kerat-''" from the Ancient Greek, Greek word κέρας, ''horn''. Structure The cornea has myelinated, unmyelinated nerve endings sensitive to touch, temperature and chemicals; a to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epipelagic
The photic zone (or euphotic zone, epipelagic zone, or sunlight zone) is the uppermost layer of a body of water that receives sunlight, allowing phytoplankton to perform photosynthesis. It undergoes a series of physical, chemical, and biological processes that supply nutrients into the upper water column. The photic zone is home to the majority of aquatic life due to the activity ( primary production) of the phytoplankton. The thicknesses of the photic and euphotic zones vary with the intensity of sunlight as a function of season and latitude and with the degree of water turbidity. The bottommost, or aphotic, zone is the region of perpetual darkness that lies beneath the photic zone and includes most of the ocean waters. Photosynthesis in photic zone In the photic zone, the photosynthesis rate exceeds the respiration rate. This is due to the abundant solar energy which is used as an energy source for photosynthesis by primary producers such as phytoplankton. These phytopla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Victor Vladimirovich Petryashov
Victor Vladimirovich Petryashov (16 March 1956 - 2 July 2018) was a Russian zoologist, carcinologist, hydrobiologist and biogeographer. His scientific research focused on taxonomy and distribution of malacostracan crustaceans, particularly orders Mysida, Lophogastrida and Leptostraca, and marine biogeography and hydrobiology of Arctic, Antarctic and temperate seas of the World, and he published over 120 works.Spiridonov, V.A., Daneliya, M.E., Smirnov, I.S., Chernyshev, A.B., Gagaev, S.Y. 2019. To the memory of Victor Vladimirovich Petryashov (1956−1918). Invertebrate Zoology, 16(3): 311–322 V.V. Petryashov spent all his professional life in St. Petersburg in the Zoological Institute of the Russian Academy of Sciences. As a senior researcher he also curated the malacostracan crustacean collection of the Zoological Institute. Named taxa Mysida: *'' Paracanthomysis shikhotaniensis'' Petrjashov, 1983 *'' Stylomysis arcticoglacialis'' (Petryashov, 1990) (originally '' Mysis ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carcinologist
This is a list of notable carcinologists. A carcinologist is a scientist who studies crustaceans or is otherwise involved in carcinology (the science of crustaceans). References {{Reflist, 24em Carcinologists, . Lists of zoologists, Carcinologists ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boreomysis Megalops
''Boreomysis'' (from Greek ''Boreas (god), Boreas'', the god of the northern winds, and the genus name ''Mysis'') is a Mysida, mysid crustacean genus, the type of the subfamily Boreomysinae of the family Mysidae. Majority of the species are found in the ocean deep water. Cosmopolitan. 38 species. Description Compared to another genus of the subfamily, ''Neobirsteiniamysis'', the members of the genus ''Boreomysis'' have narrower telson, not expanded in the central part, being always narrower than in the anterior part. Also the eyes are mostly normally developed. Although in certain species the eyes may be reduced to certain extent, they still always possess cornea, unlike in ''Neobirsteiniamysis''. Taxonomy The originally designated type species is ''Boreomysis arctica, Mysis arctica'' Krøyer, 1861. ''Boreomysis'' is one of the most difficult mysid genera, mostly due to considerable variation with age. Classification The species of ''Boreomysis'' are distributed among two subge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boreomysis Dubia
''Boreomysis'' (from Greek ''Boreas'', the god of the northern winds, and the genus name ''Mysis'') is a mysid crustacean genus, the type of the subfamily Boreomysinae of the family Mysidae. Majority of the species are found in the ocean deep water. Cosmopolitan. 38 species. Description Compared to another genus of the subfamily, '' Neobirsteiniamysis'', the members of the genus ''Boreomysis'' have narrower telson, not expanded in the central part, being always narrower than in the anterior part. Also the eyes are mostly normally developed. Although in certain species the eyes may be reduced to certain extent, they still always possess cornea, unlike in '' Neobirsteiniamysis''. Taxonomy The originally designated type species is '' Mysis arctica'' Krøyer, 1861. ''Boreomysis'' is one of the most difficult mysid genera, mostly due to considerable variation with age. Classification The species of ''Boreomysis'' are distributed among two subgenera: *''Boreomysis'' sensu stricto, 3 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pereopod
The anatomy of a decapod consists of 20 body segments grouped into two main body parts: the cephalothorax and the pleon (abdomen). Each segment – often called a somite – may possess one pair of appendages, although in various groups these may be reduced or missing. Cephalothorax Head # antennules # antennae #mandibles # first maxillae # second maxillae The head also bears the (usually stalked) compound eyes. The distal portion of a mandible or maxilla which has a sensory function is known as a palp. Thorax / pereon #first maxillipeds #second maxillipeds #third maxillipeds #first pereiopods #second pereiopods #third pereiopods #fourth pereiopods #fifth pereiopods Maxillipeds are appendages modified to function as mouthparts. Particularly in the less advanced decapods, these can be very similar to the pereiopods. Pereiopods are primarily walking legs and are also used for gathering food. They are also the ten legs from which decapods take their name. Those pereiopods which ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carapace
A carapace is a dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tortoises, the underside is called the plastron. In botany, a carapace refers to the hard outer cover of a seed which protects the inner embryo. Crustaceans In crustaceans, the carapace functions as a protective cover over the cephalothorax (i.e., the fused head and thorax, as distinct from the abdomen behind). Where it projects forward beyond the eyes, this projection is called a rostrum. The carapace is calcified to varying degrees in different crustaceans. Zooplankton within the phylum Crustacea also have a carapace. These include Cladocera, ostracods, and isopods, but isopods only have a developed "cephalic shield" carapace covering the head. Arachnids In arachnids, the carapace is formed by the fusion of prosomal tergites into a single pl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rostrum (anatomy)
Rostrum (from Latin ', meaning '':wikt:beak, beak'') is a term used in anatomy for several kinds of hard, beak-like structures projecting out from the head or mouth of an animal. Despite some visual similarity, many of these are Phylogenetics, phylogenetically unrelated structures in widely varying species. Invertebrates * In spiders, the rostrum is a part of the mouth of which it borders the opening in front. Homologous of an upper lip, this outgrowth is especially characterised by the presence of a pocket-shaped secreting organ, the rostral gland, only accessible by the sole means of histology and electron microscopy (external link "archentoflor"). * In crustaceans, the rostrum is the forward extension of the carapace in front of the eyes. It is generally a rigid structure, but can be connected by a hinged joint, as seen in Leptostraca. * Among insects, the rostrum is the name for the piercing insect mouthparts, mouthparts of the order Hemiptera as well as those of the snow s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boreomysis Arctica
''Boreomysis'' (from Greek ''Boreas'', the god of the northern winds, and the genus name ''Mysis'') is a mysid crustacean genus, the type of the subfamily Boreomysinae of the family Mysidae. Majority of the species are found in the ocean deep water. Cosmopolitan. 38 species. Description Compared to another genus of the subfamily, '' Neobirsteiniamysis'', the members of the genus ''Boreomysis'' have narrower telson, not expanded in the central part, being always narrower than in the anterior part. Also the eyes are mostly normally developed. Although in certain species the eyes may be reduced to certain extent, they still always possess cornea, unlike in '' Neobirsteiniamysis''. Taxonomy The originally designated type species is '' Mysis arctica'' Krøyer, 1861. ''Boreomysis'' is one of the most difficult mysid genera, mostly due to considerable variation with age. Classification The species of ''Boreomysis'' are distributed among two subgenera: *''Boreomysis'' sensu stricto, 3 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
