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Pygmy Rabbit
The pygmy rabbit (''Sylvilagus idahoensis'') is a rabbit species native to the United States. It is the only native rabbit species in North America to dig its own burrow. The pygmy rabbit differs significantly from species within either the '' Lepus'' (hare) or '' Sylvilagus'' (cottontail) genera, and was once considered to be within the genus '' Brachylagus'', which includes one extinct species. One isolated population, the Columbia Basin pygmy rabbit, is listed as an endangered species by the U.S. Federal government, though the International Union for Conservation of Nature lists the species as lower risk. Taxonomy The pygmy rabbit was first described by Clinton Hart Merriam in 1891, as ''Lepus idahoensis''; the type specimen, in winter pelage, had been collected in the Pahsimeroi Valley the previous autumn. In 1900, Gerrit S. Miller, Jr. erected the new subgenus '' Brachylagus'' for the pygmy rabbit; ''Brachylagus'' has since been elevated to the rank of genus. Historica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clinton Hart Merriam
Clinton Hart Merriam (December 5, 1855 – March 19, 1942) was an American zoologist, mammalogist, ornithologist, entomologist, ecologist, ethnographer, geographer, natural history, naturalist and physician. He was commonly known as the "father of mammalogy," a branch of zoology referring to the study of mammals. Early life Clinton Hart Merriam was born in New York City in 1855 to Clinton Levi Merriam, a U.S. congressman, and Caroline Hart, a judge's daughter and a graduate of Rutgers University, Rutgers Institute. The name Clinton, shared by both father and son, was in honor of New York governor DeWitt Clinton, whom the Merriam family had connections with. To avoid confusion, the younger Merriam went by his first initial combined with his middle name, his mother's maiden name, and thus often appears as C. Hart Merriam in both the literature of his time and thereafter. Although born in New York City, where his parents were staying the winter, the family home and place where Mer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pahsimeroi River
The Pahsimeroi River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed May 3, 2011 river in Idaho in the United States. It is a tributary of the Salmon River, which in turn is a tributary to the Snake River and Columbia River. Course From its source in Custer County, at the confluence of the West Fork and East Fork headwaters, the Pahsimeroi River flows generally northwest, through the Pahsimeroi Valley, between the Lemhi Range to the east, and the Lost River Range and to the west. The Pahsimeroi River joins the Salmon River near Ellis, Idaho, upriver from Salmon, Idaho. River modification The water of the Pahsimeroi River and its tributaries is used for irrigation agriculture. All of the river's mainstem tributaries are wholly diverted and totally disconnected year round due to diversion for irrigation. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bannack, Montana
Bannack is a ghost town in Beaverhead County, Montana, United States, located on Grasshopper Creek, approximately upstream from where Grasshopper Creek joins with the Beaverhead River south of Dillon. Founded in 1862, the town is a National Historic Landmark managed by the state of Montana as Bannack State Park. History Founded in 1862 and named after the local Bannock natives, Bannack was the site of a major gold discovery in 1862, and served as the capital of Montana Territory briefly in 1864, until the capital was moved to Virginia City. Bannack continued as a mining town, though with a dwindling population. The last residents left in the 1970s. At its peak, Bannack had a population of about ten thousand. Extremely remote, it was connected to the rest of the world only by the Montana Trail. There were three hotels, three bakeries, three blacksmith shops, two stables, two meat markets, a grocery store, a restaurant, a brewery, a billiard hall, and four saloons. Though a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dillon, Montana
Dillon is a city in and the county seat of Beaverhead County, Montana, Beaverhead County, Montana, United States. The population was 3,880 at the 2020 United States census, 2020 census. The city was named for Sidney Dillon (1812–1892), president of Union Pacific Railroad. History Dillon was founded in the Beaverhead River, Beaverhead Valley as a railroad town in 1880. Originally named “Terminus” as it was temporarily the northernmost stop on the Utah and Northern Railway while it was under construction, in 1881, the community was renamed for Union Pacific Railroad President Sidney Dillon, who had directed the project of bringing the railroad through to Butte, Montana. The town's location was selected by the railroad in part because of its proximity to gold mining, gold mines in the area. The first ore discovered in the Dillon area was silver. Gold was first discovered at Grasshopper Creek in 1862, precipitating a flood of immigration to the area. The last real gold rush ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Basin
The Great Basin () is the largest area of contiguous endorheic watersheds, those with no outlets to the ocean, in North America. It spans nearly all of Nevada, much of Utah, and portions of California, Idaho, Oregon, Wyoming, and Baja California. It is noted for both its arid climate and the basin and range topography that varies from the North American low point at Badwater Basin in Death Valley to the highest point of the contiguous United States, less than away at the summit of Mount Whitney. The region spans several physiographic divisions, biomes, ecoregions, and deserts. Definition The term "Great Basin" is applied to hydrographic, biological, floristic, physiographic, topographic, and ethnographic geographic areas. The name was originally coined by John C. Frémont, who, based on information gleaned from Joseph R. Walker as well as his own travels, recognized the hydrographic nature of the landform as "having no connection to the ocean". The hydrographic defi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molar (tooth)
The molars or molar teeth are large, flat teeth at the back of the mouth. They are more developed in mammals. They are used primarily to grind food during chewing. The name ''molar'' derives from Latin, ''molaris dens'', meaning "millstone tooth", from ''mola'', millstone and ''dens'', tooth. Molars show a great deal of diversity in size and shape across the mammal groups. The third molar of humans is sometimes vestigial. Human anatomy In humans, the molar teeth have either four or five cusps. Adult humans have 12 molars, in four groups of three at the back of the mouth. The third, rearmost molar in each group is called a wisdom tooth. It is the last tooth to appear, breaking through the front of the gum at about the age of 20, although this varies among individuals and populations, and in many cases the tooth is missing. The human mouth contains upper (maxillary) and lower (mandibular) molars. They are: maxillary first molar, maxillary second molar, maxillary third mol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Premolar
The premolars, also called premolar Tooth (human), teeth, or bicuspids, are transitional teeth located between the Canine tooth, canine and Molar (tooth), molar teeth. In humans, there are two premolars per dental terminology#Quadrant, quadrant in the permanent teeth, permanent set of teeth, making eight premolars total in the mouth. They have at least two Cusp (dentistry), cusps. Premolars can be considered transitional teeth during chewing, or mastication. They have properties of both the canines, that lie anterior and molars that lie Posterior (anatomy), posterior, and so food can be transferred from the canines to the premolars and finally to the molars for grinding, instead of directly from the canines to the molars. Human anatomy The premolars in humans are the maxillary first premolar, maxillary second premolar, mandibular first premolar, and the mandibular second premolar. Premolar teeth by definition are permanent teeth Anatomical terms of location#Proximal and distal, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canine Tooth
In mammalian oral anatomy, the canine teeth, also called cuspids, dogteeth, eye teeth, vampire teeth, or fangs, are the relatively long, pointed teeth. In the context of the upper jaw, they are also known as '' fangs''. They can appear more flattened, however, causing them to resemble incisors and leading them to be called ''incisiform''. They developed and are used primarily for firmly holding food in order to tear it apart, and occasionally as weapons. They are often the largest teeth in a mammal's mouth. Individuals of most species that develop them normally have four, two in the upper jaw and two in the lower, separated within each jaw by incisors; humans and dogs are examples. In most species, canines are the anterior-most teeth in the maxillary bone. The four canines in humans are the two upper maxillary canines and the two lower mandibular canines. They are specially prominent in dogs (Canidae), hence the name. Details There are generally four canine teeth: two ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Incisor
Incisors (from Latin ''incidere'', "to cut") are the front teeth present in most mammals. They are located in the premaxilla above and on the mandible below. Humans have a total of eight (two on each side, top and bottom). Opossums have 18, whereas armadillos, anteaters and other animals in the order Edentata have none. Structure Adult humans normally have eight incisors, two of each type. The types of incisors are: * maxillary central incisor (upper jaw, closest to the center of the lips) * maxillary lateral incisor (upper jaw, beside the maxillary central incisor) * mandibular central incisor (lower jaw, closest to the center of the lips) * mandibular lateral incisor (lower jaw, beside the mandibular central incisor) Children with a full set of deciduous teeth (primary teeth) also have eight incisors, named the same way as in permanent teeth. Young children may have from zero to eight incisors depending on the stage of their tooth eruption and tooth development. Typic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dental Formula
Dentition pertains to the development of teeth and their arrangement in the mouth. In particular, it is the characteristic arrangement, kind, and number of teeth in a given species at a given age. That is, the number, type, and morpho-physiology (that is, the relationship between the shape and form of the tooth in question and its inferred function) of the teeth of an animal. Terminology Animals whose teeth are all of the same type, such as most non-mammalian vertebrates, are said to have '' homodont'' dentition, whereas those whose teeth differ morphologically are said to have '' heterodont'' dentition. The dentition of animals with two successions of teeth (deciduous, permanent) is referred to as '' diphyodont'', while the dentition of animals with only one set of teeth throughout life is ''monophyodont''. The dentition of animals in which the teeth are continuously discarded and replaced throughout life is termed ''polyphyodont''. The dentition of animals in which the teeth a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leporid
Leporidae () is the family of rabbits and hares, containing over 70 species of extant mammals in all. The family name comes from "Lepus", hare in Latin. Together with the pikas, the Leporidae constitute the mammalian order Lagomorpha. Leporidae differ from pikas in that they have short, furry tails and elongated ears and hind legs. The common name "rabbit" usually applies to all genera in the family except ''Lepus'', while members of ''Lepus'' (almost half the species) usually are called hares. Like most common names, however, the distinction does not match current taxonomy completely; jackrabbits are members of ''Lepus'', and members of the genera '' Pronolagus'' and '' Caprolagus'' sometimes are called hares. Various countries across all continents except Antarctica and Australia have indigenous species of Leporidae. Furthermore, rabbits, most significantly the European rabbit, ''Oryctolagus cuniculus'', also have been introduced to most of Oceania and to many other islands, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lagomorpha
The lagomorphs () are the members of the taxonomic order Lagomorpha, of which there are two living families: the Leporidae (rabbits and hares) and the Ochotonidae ( pikas). There are 110 recent species of lagomorph, of which 109 species in twelve genera are extant, including ten genera of rabbits (42 species); one genus of hare (33 species) and one genus of pika (34 species). The name of the order is derived from the Ancient Greek (, "hare") + (, "form"). Taxonomy and evolutionary history Other names used for this order, now considered synonymous, include: ''Duplicidentata'' (Illiger, 1811); ''Leporida'' (Averianov, 1999); ''Neolagomorpha'' (Averianov, 1999); ''Ochotonida'' (Averianov, 1999); and ''Palarodentia'' (Haeckel, 1895; Lilian, 2016). The evolutionary history of the lagomorphs is still not well understood. In the late 20th century, it was generally agreed that '' Eurymylus'', which lived in eastern Asia and dates back to the late Paleocene or early Eocene, was a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
