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Dasyatis Americana
The southern stingray (''Hypanus americanus'') is a whiptail stingray found in tropical and subtropical waters of the Western Atlantic Ocean from New Jersey to southern Brazil. It has a flat, diamond-shaped disc, with a mud brown, olive, and grey dorsal surface and white underbelly (ventral surface). The barb on its tail is serrated and covered in a venomous mucus, used for self-defense. Description The southern stingray is adapted for life on the sea bed. Its flattened, diamond-shaped body is more angular than other rays. In public aquariums, female southern stingrays have been seen biting one another on the edges of their fins. Reproduction has also been known to occur within large public aquariums. Gallery File:Dasyatis americana bonaire.jpg, A southern stingray in Bonaire. File:Southern stingrays at stingray city.jpg, Several southern stingrays swimming around at Grand Cayman. File:Southern Stingray Dasyatis Americana (227919279).jpeg, A southern stingray in resting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dasyatis Americana (southern Stingray) (San Salvador Island, Bahamas) 7 (16152781622)
The southern stingray (''Hypanus americanus'') is a whiptail stingray found in tropical and subtropical waters of the Western Atlantic Ocean from New Jersey to southern Brazil. It has a flat, diamond-shaped disc, with a mud brown, olive, and grey dorsal surface and white underbelly (ventral surface). The barb on its tail is serrated and covered in a venomous mucus, used for self-defense. Description The southern stingray is adapted for life on the sea bed. Its flattened, diamond-shaped body is more angular than other rays.Southern Stingray Southern stingray Biological Profile, Ichthyology Department, Florida Museum of Natural History (August, 2007) - via ARKive The top of the body varies between olive brown and green in adults, dark grey in juveniles, whilst the underside is white. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dasyatis Americana
The southern stingray (''Hypanus americanus'') is a whiptail stingray found in tropical and subtropical waters of the Western Atlantic Ocean from New Jersey to southern Brazil. It has a flat, diamond-shaped disc, with a mud brown, olive, and grey dorsal surface and white underbelly (ventral surface). The barb on its tail is serrated and covered in a venomous mucus, used for self-defense. Description The southern stingray is adapted for life on the sea bed. Its flattened, diamond-shaped body is more angular than other rays. In public aquariums, female southern stingrays have been seen biting one another on the edges of their fins. Reproduction has also been known to occur within large public aquariums. Gallery File:Dasyatis americana bonaire.jpg, A southern stingray in Bonaire. File:Southern stingrays at stingray city.jpg, Several southern stingrays swimming around at Grand Cayman. File:Southern Stingray Dasyatis Americana (227919279).jpeg, A southern stingray in resting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samuel Frederick Hildebrand
Samuel Frederick Hildebrand (August 15, 1883 – March 16, 1949) was an American ichthyologist. Life and work Hildebrand was the son of German-born parents who immigrated to the United States in 1864. From 1908 to 1910 he worked as an assistant to Seth Eugene Meek at the Field Museum of Natural History in Chicago. In 1910 he received his Bachelor of Arts degree from Indiana State Normal School and became a research associate at the United States Bureau of Fisheries in Washington, D.C., where he remained until 1914. From 1910 to 1912 he undertook, with Meek, two collecting expeditions to Panama from which he published ''The Fishes of the Fresh Waters of Panama'' (1916) and ''The Marine Fishes of Panama'' (1923). From 1914 to 1918 he was head of the U.S. Fisheries Biological Station at Beaufort, North Carolina. In 1918 he studied mosquito control by small fish in Augusta, Georgia. From 1918 to 1919 he was director of the U.S. Fisheries Biological Station in Key West, Florida. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crustaceans
Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group can be treated as a subphylum under the clade Mandibulata. It is now well accepted that the hexapods emerged deep in the Crustacean group, with the completed group referred to as Pancrustacea. Some crustaceans (Remipedia, Cephalocarida, Branchiopoda) are more closely related to insects and the other hexapods than they are to certain other crustaceans. The 67,000 described species range in size from '' Stygotantulus stocki'' at , to the Japanese spider crab with a leg span of up to and a mass of . Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) limbs, and by th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cayman Islands
The Cayman Islands () is a self-governing British Overseas Territory—the largest by population in the western Caribbean Sea. The territory comprises the three islands of Grand Cayman, Cayman Brac and Little Cayman, which are located to the south of Cuba and northeast of Honduras, between Jamaica and Mexico's Yucatán Peninsula. The capital city is George Town on Grand Cayman, which is the most populous of the three islands. The Cayman Islands is considered to be part of the geographic Western Caribbean Zone as well as the Greater Antilles. The territory is a major world offshore financial centre for international businesses and wealthy individuals, largely as a result of the state not charging taxes on any income earned or stored. With a GDP per capita of $91,392, the Cayman Islands has the highest standard of living in the Caribbean. Immigrants from over 130 countries and territories reside in the Cayman Islands. History No archaeological evidence for an indigenous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grand Cayman
Grand Cayman is the largest of the three Cayman Islands and the location of the territory's capital, George Town. In relation to the other two Cayman Islands, it is approximately 75 miles (121 km) southwest of Little Cayman and 90 miles (145 km) southwest of Cayman Brac. Geography Grand Cayman encompasses 76% of the territory's entire land mass. The island is approximately long with its widest point being wide. The elevation ranges from sea level at the beaches to above sea level on the North Side's Mastic Trail. Unlike many other Caribbean islands, Grand Cayman is for the most part, flat. This allows for more space to build as the island’s population grows. Island districts Grand Cayman Island includes five of the six districts of the Cayman Islands: Bodden Town, East End, George Town, North Side and West Bay. *Bodden Town – Founded in the 1700s, Bodden Town district comprises the central part of Grand Cayman Island, between the George Town and Nort ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bahamas
The Bahamas (), officially the Commonwealth of The Bahamas, is an island country within the Lucayan Archipelago of the West Indies in the Atlantic Ocean, North Atlantic. It takes up 97% of the Lucayan Archipelago's land area and is home to 88% of the archipelago's population. The archipelagic state consists of more than 3,000 islands, cays, and islets in the Atlantic Ocean, and is located north of Cuba and northwest of the island of Hispaniola (split between the Dominican Republic and Haiti) and the Turks and Caicos Islands, southeast of the U.S. state of Florida, and east of the Florida Keys. The capital is Nassau, Bahamas, Nassau on the island of New Providence. The Royal Bahamas Defence Force describes The Bahamas' territory as encompassing of ocean space. The Bahama Islands were inhabited by the Lucayan people, Lucayans, a branch of the Arawakan-Taino language, speaking Taíno, for many centuries. Christopher Columbus was the first European to see the islands, making hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bimini
Bimini is the westernmost district of the Bahamas and comprises a chain of islands located about due east of Miami. Bimini is the closest point in the Bahamas to the mainland United States and approximately west-northwest of Nassau. The population is 1,988 as of the 2010 census. Geography Bimini has three islands, North Bimini, South Bimini, and East Bimini. The largest islands are North Bimini and South Bimini. The District of Bimini also includes Cay Sal Bank, more than further south, which is geographically not a part of the Bimini Islands but a separate unit. North Bimini is about long and wide. Its main settlement is Alice Town, a collection of shops, restaurants, and bars on a road known as "The King's Highway". The second major road is called Queens Highway and runs almost the length of the island parallel to Kings Highway. As a low-lying island, rising sea levels may cause the entire island to become submerged. South Bimini (pop. 182) houses an airstrip, South Bi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Copulation (zoology)
In zoology, copulation is animal sexual behavior in which a male introduces sperm into the female's body, especially directly into her reproductive tract. This is an aspect of mating. Many animals that live in water use external fertilization, whereas internal fertilization may have developed from a need to maintain gametes in a liquid medium in the Late Ordovician epoch. Internal fertilization with many vertebrates (such as all reptiles, some fish, and most bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweig ...s) occurs via cloacal copulation, known as cloacal kiss (see also hemipenis), while mammals copulate vaginally, and many primitive (biology), basal vertebrates reproduce sexually with external fertilization. In spiders and insects Spiders are often confused with insects, b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Histotroph
Uterine glands or endometrial glands are tubular glands, lined by ciliated columnar epithelium, found in the functional layer of the endometrium that lines the uterus. Their appearance varies during the menstrual cycle. During the proliferative phase, uterine glands appear long due to estrogen secretion by the ovaries. During the secretory phase, the uterine glands become very coiled with wide lumens and produce a glycogen-rich secretion known as ''histotroph'' or ''uterine milk''. This change corresponds with an increase in blood flow to spiral arteries due to increased progesterone secretion from the corpus luteum. During the pre-menstrual phase, progesterone secretion decreases as the corpus luteum degenerates, which results in decreased blood flow to the spiral arteries. The functional layer of the uterus containing the glands becomes necrotic, and eventually sloughs off during the menstrual phase of the cycle. They are of small size in the unimpregnated uterus, but shortly aft ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ovoviviparous
Ovoviviparity, ovovivipary, ovivipary, or aplacental viviparity is a term used as a "bridging" form of reproduction between egg-laying oviparous and live-bearing viviparous reproduction. Ovoviviparous animals possess embryos that develop inside eggs that remain in the mother's body until they are ready to hatch. The young of some ovoviviparous amphibians, such as ''Limnonectes larvaepartus'', are born as larvae, and undergo further metamorphosis outside the body of the mother. Members of genera ''Nectophrynoides'' and ''Eleutherodactylus'' bear froglets, not only the hatching, but all the most conspicuous metamorphosis, being completed inside the body of the mother before birth. Among insects that depend on opportunistic exploitation of transient food sources, such as many Sarcophagidae and other carrion flies, and species such as many Calliphoridae, that rely on fresh dung, and parasitoids such as tachinid flies that depend on entering the host as soon as possible, the emb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nannopterum Auritum
The double-crested cormorant (''Nannopterum auritum'') is a member of the cormorant family of water birds. It is found near rivers and lakes, and in coastal areas, and is widely distributed across North America, from the Aleutian Islands in Alaska down to Florida and Mexico. Measuring in length, it is entirely black except for a bare patch of orange-yellow facial skin and some extra plumage that it exhibits in the breeding season, when it grows a double crest in which black feathers are mingled with white. Five subspecies are recognized. It mainly eats fish and hunts by swimming and diving. Its feathers, like those of all cormorants, are not waterproof and it must spend time drying them out after spending time in the water. Once threatened by the use of DDT, the numbers of this bird have increased markedly in recent years. Taxonomy The double-crested cormorant was described by René Primevère Lesson in 1831. It was formerly classified in the genus ''Phalacrocorax'', but a 2014 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
