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Dermochelys
The leatherback sea turtle (''Dermochelys coriacea''), sometimes called the lute turtle or leathery turtle or simply the luth, is the largest of all living turtles and the heaviest non-crocodilian reptile, reaching lengths of up to and weights of . It is the only living species in the genus ''Dermochelys'' and family Dermochelyidae. It can easily be differentiated from other modern sea turtles by its lack of a bony shell; instead, its carapace is covered by oily flesh and flexible, leather-like skin, for which it is named. Taxonomy and evolution Taxonomy ''Dermochelys coriacea'' is the only species in genus ''Dermochelys''. The genus, in turn, contains the only extant member of the family Dermochelyidae. Domenico Agostino Vandelli named the species first in 1761 as ''Testudo coriacea'' after an animal captured at Ostia and donated to the University of Padua by Pope Clement XIII. In 1816, French zoologist Henri Blainville coined the term ''Dermochelys''. The leatherbac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Turtle
Sea turtles (superfamily Chelonioidea), sometimes called marine turtles, are reptiles of the order Testudines and of the suborder Cryptodira. The seven existing species of sea turtles are the flatback, green, hawksbill, leatherback, loggerhead, Kemp's ridley, and olive ridley sea turtles. All six of the sea turtle species present in US waters (all of those listed above except the flatback) are listed as endangered and/or threatened under the Endangered Species Act. The seventh sea turtle species is the flatback, which exists in the waters of Australia, Papua New Guinea and Indonesia. Sea turtles can be separated into the categories of hard-shelled ( cheloniid) and leathery-shelled ( dermochelyid).Wyneken, J. 2001. The Anatomy of Sea Turtles. U.S Department of Commerce NOAA Technical Memorandum NMFS-SEFSC-470, 1-172 pp. There is only one dermochelyid species which is the leatherback sea turtle. Description For each of the seven types of sea turtles, females and males are t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dermochelyidae
Dermochelyidae is a family of turtles which has seven extinct genera and one extant genus, including the largest living sea turtles. Classification of known genera The following list of dermochelyid species was published by Hirayama and Tong in 2003, unless otherwise noted. * ''Arabemys crassiscutata'' * †''Eosphargis breineri'' * ''Mesodermochelys undulatus'' *Subfamily Dermochelyinae ** †''Cosmochelys'' ** ''Dermochelys coriacea'' – leatherback sea turtle ** †''Psephophorus ''Psephophorus'' is an extinct genus of sea turtle that lived from the Oligocene to the Pliocene. Its remains have been found in Europe, Africa, North America, and New Zealand. It was first named by Hermann von Meyer in 1847, and contains seven s ...'' Phylogeny Evers et al. (2019): References Bibliography * External linksFamily Dermochelyidae (Leatherback turtles) from Turtles of the World by C.H. Ernst, R.G.M. Altenburg & R.W. Barbour {{Taxonbar, from=Q2738058 Taxa named by Leo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Domenico Agostino Vandelli
Domenico Agostino Vandelli (Padua, 8 July 1735 – Lisbon, 27 June 1816) was an Italian naturalist, who did most of his scientific work in Portugal. He studied at the University of Padua, from which he received a doctorate in Natural Philosophy and Medicine in 1756. While active as naturalist in Italy he began a correspondence with the Swedish naturalist Carl von Linné, which continued for several years. In 1763 he was invited by Catherine the Great of Russia to join the faculty of the University of St. Petersburg, but he declined. In 1764 Vandelli moved to Portugal, where in 1765 he was appointed lecturer in chemistry and natural sciences at the University of Coimbra. He was the first supervisor for the orientation of the Botanical Garden of the University of Coimbra, being followed in 1791 by Félix Avelar Brotero. One of his major works he published was the ''Tractatus de thermis agri patavini'' in 1761. In about 1793 he became the first director of the Botanical Gard ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turtle
Turtles are an order of reptiles known as Testudines, characterized by a special shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Cryptodira (hidden necked turtles), which differ in the way the head retracts. There are 360 living and recently extinct species of turtles, including land-dwelling tortoises and freshwater terrapins. They are found on most continents, some islands and, in the case of sea turtles, much of the ocean. Like other amniotes (reptiles, birds, and mammals) they breathe air and do not lay eggs underwater, although many species live in or around water. Turtle shells are made mostly of bone; the upper part is the domed carapace, while the underside is the flatter plastron or belly-plate. Its outer surface is covered in scales made of keratin, the material of hair, horns, and claws. The carapace bones develop from ribs that grow sideways and develop into broad flat plates ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protostegidae
Protostegidae is a family of extinct marine turtles that lived during the Cretaceous period. The family includes some of the largest sea turtles that ever existed. The largest, '' Archelon'', had a head long. Like most sea turtles, they had flattened bodies and flippers for front appendages; protostegids had minimal shells like leatherback turtles of modern times. Anatomy As some of the first marine turtles, the protostegids set the general body plan for future species of sea turtles. They had a generally depressed turtle body plan, complete with four limbs, a short tail, and a large head at the end of a relatively short neck. Like other sea turtles, they possessed oar-like front appendages especially evolved for swimming in the open ocean. Similar to the still- extant, possibly closely related Dermochelyidae, protostegids possessed extremely reduced carapaces. Some specimens had skeletal protrusions from their ribs almost wrapping around their bodies in place of a complet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Domenico Vandelli
Domenico Agostino Vandelli (Padua, 8 July 1735 – Lisbon, 27 June 1816) was an Italian naturalist, who did most of his scientific work in Portugal. He studied at the University of Padua, from which he received a doctorate in Natural Philosophy and Medicine in 1756. While active as naturalist in Italy he began a correspondence with the Swedish naturalist Carl von Linné, which continued for several years. In 1763 he was invited by Catherine the Great of Russia to join the faculty of the University of St. Petersburg, but he declined. In 1764 Vandelli moved to Portugal, where in 1765 he was appointed lecturer in chemistry and natural sciences at the University of Coimbra. He was the first supervisor for the orientation of the Botanical Garden of the University of Coimbra, being followed in 1791 by Félix Avelar Brotero. One of his major works he published was the ''Tractatus de thermis agri patavini'' in 1761. In about 1793 he became the first director of the Botanical G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fluid Dynamics
In physics and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids— liquids and gases. It has several subdisciplines, including ''aerodynamics'' (the study of air and other gases in motion) and hydrodynamics (the study of liquids in motion). Fluid dynamics has a wide range of applications, including calculating forces and moments on aircraft, determining the mass flow rate of petroleum through pipelines, predicting weather patterns, understanding nebulae in interstellar space and modelling fission weapon detonation. Fluid dynamics offers a systematic structure—which underlies these practical disciplines—that embraces empirical and semi-empirical laws derived from flow measurement and used to solve practical problems. The solution to a fluid dynamics problem typically involves the calculation of various properties of the fluid, such as flow velocity, pressure, density, and temperature, as functions of space and ti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scute
A scute or scutum (Latin: ''scutum''; plural: ''scuta'' "shield") is a bony external plate or scale overlaid with horn, as on the shell of a turtle, the skin of crocodilians, and the feet of birds. The term is also used to describe the anterior portion of the mesonotum in insects as well as some arachnids (e.g., the family Ixodidae, the scale ticks). Properties Scutes are similar to scales and serve the same function. Unlike the scales of lizards and snakes, which are formed from the epidermis, scutes are formed in the lower vascular layer of the skin and the epidermal element is only the top surface . Forming in the living dermis, the scutes produce a horny outer layer that is superficially similar to that of scales. Scutes will usually not overlap as snake scales (but see the pangolin). The outer keratin layer is shed piecemeal, and not in one continuous layer of skin as seen in snakes or lizards. The dermal base may contain bone and produce dermal armour. Scutes with a bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flickr - Rainbirder - LEVIATHAN
Flickr ( ; ) is an American image hosting service, image hosting and Online video platform, video hosting service, as well as an online community, founded in Canada and headquartered in the United States. It was created by Ludicorp in 2004 and was a popular way for amateur and professional photographers to host high-resolution photos. It has changed ownership several times and has been owned by SmugMug since April 20, 2018. Flickr had a total of 112 million registered members and more than 3.5 million new images uploaded daily. On August 5, 2011, the site reported that it was hosting more than 6 billion images. Photos and videos can be accessed from Flickr without the need to register an account, but an account must be made to upload content to the site. Registering an account also allows users to create a profile page containing photos and videos that the user has uploaded and also grants the ability to add another Flickr user as a contact. For mobile users, Flickr has off ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pope Clement XIII
Pope Clement XIII ( la, Clemens XIII; it, Clemente XIII; 7 March 1693 – 2 February 1769), born Carlo della Torre di Rezzonico, was head of the Catholic Church and ruler of the Papal States from 6 July 1758 to his death in February 1769. He was installed on 16 July 1758. His pontificate was overshadowed by the constant pressure to suppress the Society of Jesus but despite this, he championed their order and also proved to be their greatest defender at that time. He was also one of the few early popes who favoured dialogue with Protestants and to this effect hoped to mend the schism with the Catholic Church that existed in England and the Low Countries. These efforts ultimately bore little fruit. Biography Early life Carlo della Torre di Rezzonico was born in 1693 to a recently ennobled family of Venice, the second of two children of the man who bought the unfinished palace on the Grand Canal (now Ca' Rezzonico) and finished its construction. His parents were Giov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cladistics
Cladistics (; ) is an approach to biological classification in which organisms are categorized in groups (" clades") based on hypotheses of most recent common ancestry. The evidence for hypothesized relationships is typically shared derived characteristics ( synapomorphies'')'' that are not present in more distant groups and ancestors. However, from an empirical perspective, common ancestors are inferences based on a cladistic hypothesis of relationships of taxa whose character states can be observed. Theoretically, a last common ancestor and all its descendants constitute a (minimal) clade. Importantly, all descendants stay in their overarching ancestral clade. For example, if the terms ''worms'' or ''fishes'' were used within a ''strict'' cladistic framework, these terms would include humans. Many of these terms are normally used paraphyletically, outside of cladistics, e.g. as a ' grade', which are fruitless to precisely delineate, especially when including extinct species. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the Latin ''creta'', "chalk", which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation ''Kreide''. The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now- extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was ice free, and forests extended to the poles. During this time, new groups of mammals and birds appeared. During the Early Cretaceous, flowering plants appeared and began to rapidly diversify, becoming the dominant group of plants across the E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
