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Dwarf Siren
Dwarf sirens are eel-like salamanders of the genus ''Pseudobranchus''. Dwarf sirens possess external gills throughout adulthood and lack hind legs. Dwarf sirens can be distinguished from members of the genus ''Siren'' in that dwarf sirens have three toes on each foot rather than four. Like sirens, dwarf sirens are restricted to the Southeastern United States. Species The genus ''Pseudobranchus'' consists of the following extant species: * Southern dwarf siren (''P. axanthus'') **Narrow-striped dwarf siren (''P. a. axanthus'') **Everglades dwarf siren (''P. a. belli'') * Northern dwarf siren (''P. striatus'') **Broad-striped dwarf siren (''P. s. striatus'') **Gulf Hammock dwarf siren (''P. s. lustricolus'') **Slender dwarf siren (''P. s. spheniscus'') There are also two extinct species known from fossil evidence: * †''Pseudobranchus vetustus'' (Miocene to Pliocene of Florida) * †''Pseudobranchus robustus'' (Pleistocene The Pleistocene ( , often referred to as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Edward Gray
John Edward Gray, FRS (12 February 1800 – 7 March 1875) was a British zoologist. He was the elder brother of zoologist George Robert Gray and son of the pharmacologist and botanist Samuel Frederick Gray (1766–1828). The same is used for a zoological name. Gray was keeper of zoology at the British Museum in London from 1840 until Christmas 1874, before the natural history holdings were split off to the Natural History Museum. He published several catalogues of the museum collections that included comprehensive discussions of animal groups and descriptions of new species. He improved the zoological collections to make them amongst the best in the world. Biography Gray was born in Walsall, but his family soon moved to London, where Gray studied medicine. He assisted his father in writing ''The Natural Arrangement of British Plants'' (1821). After being blackballed by the Linnean Society of London, Gray shifted his interest from botany to zoology. He began his zoologica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salamander
Salamanders are a group of amphibians typically characterized by their lizard-like appearance, with slender bodies, blunt snouts, short limbs projecting at right angles to the body, and the presence of a tail in both larvae and adults. All ten extant salamander families are grouped together under the order Urodela. Salamander diversity is highest in eastern North America, especially in the Appalachian Mountains; most species are found in the Holarctic realm, with some species present in the Neotropical realm. Salamanders rarely have more than four toes on their front legs and five on their rear legs, but some species have fewer digits and others lack hind limbs. Their permeable skin usually makes them reliant on habitats in or near water or other cool, damp places. Some salamander species are fully aquatic throughout their lives, some take to the water intermittently, and others are entirely terrestrial as adults. This group of amphibians is capable of regenerating lost lim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gill
A gill () is a respiratory organ that many aquatic organisms use to extract dissolved oxygen from water and to excrete carbon dioxide. The gills of some species, such as hermit crabs, have adapted to allow respiration on land provided they are kept moist. The microscopic structure of a gill presents a large surface area to the external environment. Branchia (pl. branchiae) is the zoologists' name for gills (from Ancient Greek ). With the exception of some aquatic insects, the filaments and lamellae (folds) contain blood or coelomic fluid, from which gases are exchanged through the thin walls. The blood carries oxygen to other parts of the body. Carbon dioxide passes from the blood through the thin gill tissue into the water. Gills or gill-like organs, located in different parts of the body, are found in various groups of aquatic animals, including mollusks, crustaceans, insects, fish, and amphibians. Semiterrestrial marine animals such as crabs and mudskippers have gill cham ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hind
A hind is a female deer, especially a red deer. Places * Hind (Sasanian province, 262-484) * Hind and al-Hind, a Persian and Arabic name for the Indian subcontinent * Hind (crater), a lunar impact crater * 1897 Hind, an asteroid Military * , numerous Royal Navy ships * Mil Mi-24, a helicopter, codenamed "Hind" by NATO * Hawker Hind, a Royal Air Force light bomber People * Hind (name) * Hind (singer), Bahraini singer * Hind (singer), Dutch singer also known as Hind Laroussi * Henry Youle Hind, British geologist and explorer Other uses * ''Hind'' (video game), a helicopter game simulation by Digital Integration * ''Epinephelus'', a genus of groupers (fish) sometimes referred to as hinds * Ceryneian Hind, a hind in Greek mythology See also * * Hinds (other) * Hinde (surname) * Hindi Hindi (Devanāgarī: or , ), or more precisely Modern Standard Hindi (Devanagari: ), is an Indo-Aryan language spoken chiefly in the Hindi Belt region encompassing pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siren (genus)
''Siren'' is a genus of aquatic salamanders of the family Sirenidae. The genus consists of three living species, along with one extinct species from the Eocene Epoch and three from the Miocene. The living species have elongated, eel-like bodies, with two small vestigial fore legs. Species Extant (living) species include: *''Siren intermedia'' Barnes, 1826 – lesser siren *''Siren lacertina'' Linnaeus, 1766 – greater siren *''Siren reticulata'' Graham, Kline, Steen & Kelehear, 2018 – reticulated siren or leopard eel Extinct species: *†''Siren dunni'' Goin & Auffenberg, 1957 *†''Siren hesterna'' Herre, 1955 *†''Siren miotexana'' Holman, 1977 *†''Siren simpsoni'' Herre, 1955 Siren intermedia nettingi UMFS 2015 1.JPG, ''Siren intermedia nettingi'',western lesser siren Siren_Lacertina_Skeleton_(2).jpg, '' Siren lacertina'', greater siren, skeleton See also *''Pseudobranchus'', dwarf siren Dwarf sirens are eel-like salamanders of the genus ''Pseudobranchus' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toes
Toes are the digits (fingers) of the foot of a tetrapod. Animal species such as cats that walk on their toes are described as being ''digitigrade''. Humans, and other animals that walk on the soles of their feet, are described as being ''plantigrade''; ''unguligrade'' animals are those that walk on hooves at the tips of their toes. Structure There are normally five toes present on each human foot. Each toe consists of three phalanx bones, the proximal, middle, and distal, with the exception of the big toe ( la, hallux). For a minority of people, the little toe also is missing a middle bone. The hallux only contains two phalanx bones, the proximal and distal. The joints between each phalanx are the interphalangeal joints. The proximal phalanx bone of each toe articulates with the metatarsal bone of the foot at the metatarsophalangeal joint. Each toe is surrounded by skin, and present on all five toes is a toenail. The toes are, from medial to lateral: * the first toe, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foot
The foot ( : feet) is an anatomical structure found in many vertebrates. It is the terminal portion of a limb which bears weight and allows locomotion. In many animals with feet, the foot is a separate organ at the terminal part of the leg made up of one or more segments or bones, generally including claws or nails. Etymology The word "foot", in the sense of meaning the "terminal part of the leg of a vertebrate animal" comes from "Old English fot "foot," from Proto-Germanic *fot (source also of Old Frisian fot, Old Saxon fot, Old Norse fotr, Danish fod, Swedish fot, Dutch voet, Old High German fuoz, German Fuß, Gothic fotus "foot"), from PIE root *ped- "foot". The "plural form feet is an instance of i-mutation." Structure The human foot is a strong and complex mechanical structure containing 26 bones, 33 joints (20 of which are actively articulated), and more than a hundred muscles, tendons, and ligaments.Podiatry Channel, ''Anatomy of the foot and ankle'' The joints of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southeastern United States
The Southeastern United States, also referred to as the American Southeast or simply the Southeast, is a geographical region of the United States. It is located broadly on the eastern portion of the southern United States and the southern portion of the eastern United States. It comprises at least a core of states on the lower East Coast of the United States and eastern Gulf Coast. Expansively, it reaches as far north as West Virginia and Maryland (bordered to north by the Ohio River and Mason–Dixon line), and stretching as far west as Arkansas and Louisiana. There is no official U.S. government definition of the region, though various agencies and departments use different definitions. Geography The U.S. Geological Survey considers the Southeast region to be the states of Alabama, Florida, Georgia, Arkansas, Kentucky, Louisiana, Mississippi, North Carolina, South Carolina, and Tennessee, plus Puerto Rico and the United States Virgin Islands. There is no official Census Bu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudobranchus Axanthus
The southern dwarf siren, (''Pseudobranchus axanthus'') is a perennibranch salamander lacking hind legs. Found exclusively in Florida, it is one of two currently recognized species of dwarf sirens. Two subspecies are currently recognized; ''P. a. axanthus'', the narrow-striped dwarf siren, and ''P. a. belli'', the Everglades dwarf siren. Physical description Southern dwarf sirens are thin, slimy salamanders that are frequently mistaken for eels. They have long bodies with bushy gills and small, three-toed fore legs. Coloration is generally brown, black, or gray, with yellow or tan stripes on their backs and sides. Adults reach a length of to . Southern dwarf sirens can easily be distinguished from amphiumas by size and the presence of hind legs, and from ''Siren'' spp. salamanders by the presence of three toes on each foot. Distinguishing between ''P. axanthus'' and ''P. striatus'' is more difficult, requiring comparison of patterns with a field guide, known distribution, or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene
The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recent" because it has 18% fewer modern marine invertebrates than the Pliocene has. The Miocene is preceded by the Oligocene and is followed by the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by a single distinct global event but consist rather of regionally defined boundaries between the warmer Oligocene and the cooler Pliocene Epoch. During the Early Miocene, the Arabian Peninsula collided with Eurasia, severing the connection between the Mediterranean and Indian Ocean, and allowing a faunal interchange to occur between Eurasia and Africa, including the dispersal of proboscideans into Eurasia. During the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pliocene
The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58See the 2014 version of the ICS geologic time scale million years ago. It is the second and most recent epoch of the Neogene Period in the . The Pliocene follows the Epoch and is followed by the Epoch. Prior to the 2009 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
