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Sanjuansaurus
''Sanjuansaurus'' (" San Juan Province lizard") is a genus of herrerasaurid dinosaur from the Late Triassic (Carnian) Cancha de Bochas and La PeƱa Members of the Ischigualasto Formation of the Ischigualasto-Villa UniĆ³n Basin in northwestern Argentina. Description and classification ''Sanjuansaurus'' was comparable in size to a medium-sized ''Herrerasaurus'', with a thigh bone that was long and a tibia that is in length (in the description paper the tibia is listed with 260 mm in length due to a typo). Alcober and Martinez performed a phylogenetic analysis and found ''Sanjuansaurus'' to be a herrerasaurid. It was determined that ''Sanjuansaurus'' and'' Herrerasaurus'' share many similarities in the morphology of the skull, neck vertebrae, back vertebrae, hip vertebrae, scapula, and the hip bones. Alcober and Martinez observed that ''Sanjuansaurus'' and'' Staurikosaurus ''share many similarities in the morphology of the hip bones, and the tibia. The pubis of ''Sanjuansauru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sanjuansaurus
''Sanjuansaurus'' (" San Juan Province lizard") is a genus of herrerasaurid dinosaur from the Late Triassic (Carnian) Cancha de Bochas and La PeƱa Members of the Ischigualasto Formation of the Ischigualasto-Villa UniĆ³n Basin in northwestern Argentina. Description and classification ''Sanjuansaurus'' was comparable in size to a medium-sized ''Herrerasaurus'', with a thigh bone that was long and a tibia that is in length (in the description paper the tibia is listed with 260 mm in length due to a typo). Alcober and Martinez performed a phylogenetic analysis and found ''Sanjuansaurus'' to be a herrerasaurid. It was determined that ''Sanjuansaurus'' and'' Herrerasaurus'' share many similarities in the morphology of the skull, neck vertebrae, back vertebrae, hip vertebrae, scapula, and the hip bones. Alcober and Martinez observed that ''Sanjuansaurus'' and'' Staurikosaurus ''share many similarities in the morphology of the hip bones, and the tibia. The pubis of ''Sanjuansauru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sanjuansaurus NT
''Sanjuansaurus'' (" San Juan Province lizard") is a genus of herrerasaurid dinosaur from the Late Triassic (Carnian) Cancha de Bochas and La PeƱa Members of the Ischigualasto Formation of the Ischigualasto-Villa UniĆ³n Basin in northwestern Argentina. Description and classification ''Sanjuansaurus'' was comparable in size to a medium-sized ''Herrerasaurus'', with a thigh bone that was long and a tibia that is in length (in the description paper the tibia is listed with 260 mm in length due to a typo). Alcober and Martinez performed a phylogenetic analysis and found ''Sanjuansaurus'' to be a herrerasaurid. It was determined that ''Sanjuansaurus'' and'' Herrerasaurus'' share many similarities in the morphology of the skull, neck vertebrae, back vertebrae, hip vertebrae, scapula, and the hip bones. Alcober and Martinez observed that ''Sanjuansaurus'' and'' Staurikosaurus ''share many similarities in the morphology of the hip bones, and the tibia. The pubis of ''Sanjuansaurus' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herrerasaurus
''Herrerasaurus'' is a genus of saurischian dinosaur from the Late Triassic period. This genus was one of the earliest dinosaurs from the fossil record. Its name means "Herrera's lizard", after the rancher who discovered the first specimen in 1958 in South America. All known fossils of this carnivore have been discovered in the Ischigualasto Formation of Carnian age (late Triassic according to the ICS, dated to 231.4 million years ago) in northwestern Argentina. The type species, ''Herrerasaurus ischigualastensis'', was described by Osvaldo Reig in 1963 and is the only species assigned to the genus. ''Ischisaurus'' and ''Frenguellisaurus'' are synonyms. For many years, the classification of ''Herrerasaurus'' was unclear because it was known from very fragmentary remains. It was hypothesized to be a basal theropod, a basal sauropodomorph, a basal saurischian, or not a dinosaur at all but another type of archosaur. However, with the discovery of an almost complete skeleton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herrerasauridae
Herrerasauridae is a family of carnivorous dinosaurs, possibly basal to either theropods or even all of saurischians, or even their own branching from dracohors, separate from dinosauria altogether. They are among the oldest known dinosaurs, first appearing in the fossil record around 233.23 million years ago (the Carnian stage of the Late Triassic), before becoming extinct by the end of the Carnian stage. Herrerasaurids were relatively small-sized dinosaurs, normally no more than long, although the holotype specimen of "''Frenguellisaurus ischigualastensis"'' (nowadays considered a synonym of ''Herrerasaurus'' ''ischigualastensis'') is thought to have reached around 6 meters (20 ft) long. The best known representatives of this group are from South America (Brazil, Argentina), where they were first discovered in the 1930s in relation to ''Staurikosaurus'' and 1960s in relation to ''Herrerasaurus''. A nearly complete skeleton of ''Herrerasaurus ischigualastensis'' was discovered ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ischigualasto Formation
The Ischigualasto Formation is a Late Triassic fossiliferous formation and LagerstƤtte in the Ischigualasto-Villa UniĆ³n Basin of the southwestern La Rioja Province and northeastern San Juan Province in northwestern Argentina. The formation dates to the Carnian and Norian ages and ranges between 231.7 and 225 Ma, based on ash bed dating. The up to thick formation is part of the Agua de la PeƱa Group, overlies Los Rastros Formation and is overlain by Los Colorados Formation. The formation is subdivided into four members, from old to young; La PeƱa, Cancha de Bochas, Valle de la Luna and Quebrada de la Sal. The sandstones, mudstones, conglomerates and tuffs of the formation were deposited in a humid alluvial to fluvial floodplain environment, characterized by strongly seasonal rainfall. The Ischigualasto Formation is an important paleontological unit and considered a LagerstƤtte, as it preserves several genera of early dinosaurs, other archosaurs, synapsids, and temnospon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Staurikosaurus
''Staurikosaurus'' (Pronounced "STORE-ee-koh-SAWR-us", "Southern Cross lizard") is a genus of herrerasaurid dinosaur from the Late Triassic of Brazil, found in the Santa Maria Formation. Description Colbert (1970) described ''Staurikosaurus'' as a small and agile, bipedal predator.Colbert, E. H. (1970). A Saurischian dinosaur from the Triassic of Brazil. AM. MUS. NOVITATES 2405; 1-39 ''Staurikosaurus'' lived during the late-Carnian and early-Norian stage, of the Late Triassic, approximately 225 million years agoāwhich makes it one of the earliest dinosaurs known. Its length is measured at long,Grillo, O.N. and Azevedo, S.A.K. (2011). "Recovering missing data: estimating position and size of caudal vertebrae in ''Staurikosaurus pricei'' Colbert, 1970." ''Annals of the Brazilian Academy of Sciences'', but Gregory S. Paul presented a lower length estimate of and a body mass estimate of . ''Staurikosaurus'' was small in comparison to later theropods like ''Megalosaurus''. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pelvis
The pelvis (plural pelves or pelvises) is the lower part of the trunk, between the abdomen and the thighs (sometimes also called pelvic region), together with its embedded skeleton (sometimes also called bony pelvis, or pelvic skeleton). The pelvic region of the trunk includes the bony pelvis, the pelvic cavity (the space enclosed by the bony pelvis), the pelvic floor, below the pelvic cavity, and the perineum, below the pelvic floor. The pelvic skeleton is formed in the area of the back, by the sacrum and the coccyx and anteriorly and to the left and right sides, by a pair of hip bones. The two hip bones connect the spine with the lower limbs. They are attached to the sacrum posteriorly, connected to each other anteriorly, and joined with the two femurs at the hip joints. The gap enclosed by the bony pelvis, called the pelvic cavity, is the section of the body underneath the abdomen and mainly consists of the reproductive organs (sex organs) and the rectum, while the pelvic f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ulna
The ulna (''pl''. ulnae or ulnas) is a long bone found in the forearm that stretches from the elbow to the smallest finger, and when in anatomical position, is found on the medial side of the forearm. That is, the ulna is on the same side of the forearm as the little finger. It runs parallel to the radius, the other long bone in the forearm. The ulna is usually slightly longer than the radius, but the radius is thicker. Therefore, the radius is considered to be the larger of the two. Structure The ulna is a long bone found in the forearm that stretches from the elbow to the smallest finger, and when in anatomical position, is found on the medial side of the forearm. It is broader close to the elbow, and narrows as it approaches the wrist. Close to the elbow, the ulna has a bony process, the olecranon process, a hook-like structure that fits into the olecranon fossa of the humerus. This prevents hyperextension and forms a hinge joint with the trochlea of the humerus. There is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scapula
The scapula (plural scapulae or scapulas), also known as the shoulder blade, is the bone that connects the humerus (upper arm bone) with the clavicle (collar bone). Like their connected bones, the scapulae are paired, with each scapula on either side of the body being roughly a mirror image of the other. The name derives from the Classical Latin word for trowel or small shovel, which it was thought to resemble. In compound terms, the prefix omo- is used for the shoulder blade in medical terminology. This prefix is derived from į½¦Ī¼ĪæĻ (Åmos), the Ancient Greek word for shoulder, and is cognate with the Latin , which in Latin signifies either the shoulder or the upper arm bone. The scapula forms the back of the shoulder girdle. In humans, it is a flat bone, roughly triangular in shape, placed on a posterolateral aspect of the thoracic cage. Structure The scapula is a thick, flat bone lying on the thoracic wall that provides an attachment for three groups of muscles: intrin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anatomical Terms Of Location
Standard anatomical terms of location are used to unambiguously describe the anatomy of animals, including humans. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position provides a definition of what is at the front ("anterior"), behind ("posterior") and so on. As part of defining and describing terms, the body is described through the use of anatomical planes and anatomical axes. The meaning of terms that are used can change depending on whether an organism is bipedal or quadrupedal. Additionally, for some animals such as invertebrates, some terms may not have any meaning at all; for example, an animal that is radially symmetrical will have no anterior surface, but can still have a description that a part is close to the middle ("proximal") or further from the middle ("distal"). International organisations have determined vocabularies that are often used as standard vocabularies for subdisciplines of anatom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Axis (anatomy)
In anatomy, the axis (from Latin ''axis'', "axle") or epistropheus is the second cervical vertebra (C2) of the spine, immediately inferior to the atlas, upon which the head rests. The axis' defining feature is its strong odontoid process (bony protrusion) known as the dens, which rises dorsally from the rest of the bone. Structure The body is deeper in front or in the back and is prolonged downward anteriorly to overlap the upper and front part of the third vertebra. It presents a median longitudinal ridge in front, separating two lateral depressions for the attachment of the longus colli muscles. Odontoid Process of Axis (Dens) The dens, also called the odontoid process or the peg, is the most pronounced projecting feature of the axis. The dens exhibits a slight constriction where it joins the main body of the vertebra. The condition where the dens is separated from the body of the axis is called ''os odontoideum'' and may cause nerve and circulation compression syndrome. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochanter
A trochanter is a tubercle of the femur near its joint with the hip bone. In humans and most mammals, the trochanters serve as important muscle attachment sites. Humans are known to have three trochanters, though the anatomic "normal" includes only the greater and lesser trochanters. (The third trochanter is not present in all specimens.) Etymology "Trokhos" (Greek) = "wheel", with reference to the spherical femoral head which was first named "trokhanter". Later usage came to include the femoral neck. Structure In human anatomy, the trochanter is a part of the femur. It can refer to: * Greater trochanter * Lesser trochanter * Third trochanter, which is occasionally present Other animals * Fourth trochanter, of archosaur leg bones * Trochanter (arthropod leg), a segment of the arthropod leg See also * Intertrochanteric crest * Intertrochanteric line References External links * * {{Bones of lower extremity Trochanter A trochanter is a tubercle of the femur n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
