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Teiidae
Teiidae is a family of lacertoidean lizards native to the Americas. Members of this family are generally known as whiptails or racerunners; however, tegus also belong to this family. Teiidae is sister to the Gymnophthalmidae, Gymnopthalmidae, and both families comprise the Teiioidea. The Teiidae includes several Parthenogenesis, parthenogenic species – a mode of clonal reproduction. Presently, the Teiidae consists of approximately 150 species in eighteen genus, genera. Morphology and behavior Teiids can be distinguished from other lizards by the following characteristics: large rectangular scale (zoology), scales that form distinct transverse rows Anatomical terms of location#Dorsal and ventral, ventrally and generally small granular scale (zoology), scales Dorsum (anatomy), dorsally, head scales that are separate from the skull bones, and teeth that are solid at the base and "glued" to the jaw bones. Additionally, all teiids have a forked, snake-like tongue. They all possess we ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barbatteiidae
Barbatteiidae is an extinct family of lizards, endemic to the paleoisland Hațeg Island in the Tethys Ocean during the final stages of the Cretaceous, In what is now Romania. It contains two monotypic genera, ''Barbatteius'' and ''Oardasaurus'', alongside some indeterminate material. It appears to be closely related to modern Teiidae, teiids and the Early Cretaceous lizard genus ''Meyasaurus'' References {{Taxonbar, from=Q55639269 Late Cretaceous lepidosaurs of Europe Cretaceous Romania Fossils of Romania Lizard families, † ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lacertoidea
The Lacertoidea is a group of squamate reptiles that includes the Lacertidae, Teiidae, Gymnophthalmidae, and Amphisbaenia. The finding from molecular phylogenetic studies that the burrowing Amphisbaenia were nested in a clade with the lizard forms led Vidal & Hedges (2005) to propose a new name for the group based on shared morphogical characters, Laterata, "referring to the presence of tile-like (squarish or quadrangular, and sometimes raised) scales that form the rings in Amphisbaenia, and are also present ventrally in Lacertiformata and Teiformata". Studies of anatomy have traditionally grouped the lacertoids with skinks; however, more recent studies focusing on DNA have placed them as a distinct group of lizards, more closely related to the venomous Toxicofera.Wiens, J. J., Hutter, C. R., Mulcahy, D. G., Noonan, B. P., Townsend, T. M., Sites, J. W., & Reeder, T. W. (2012). Resolving the phylogeny of lizards and snakes (Squamata) with extensive sampling of genes and species. Bi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tupinambis Teguixin
The gold tegu, also known as the golden tegu, common tegu, black tegu, Colombian black and white tegu and tiger lizard (in Trinidad), is a species of tegu. Taxonomy Its old scientific name (synonym) was ''Tupinambis nigropunctatus'', but it has since renamed to ''Tupinambis teguixin''. Description Gold tegus grow to be about 2 to 3 ft (60 to 100 cm) long on average, and up to 3.5 to 4.0 kg in weight, with a glossy body, powerful limbs and a thick tail. They have many black and gold stripes down their bodies. File:Tupinambis teguixin DT -N Yuralpa- (13) (20123669353).jpg, In Ecuador File:Tupinambis teguixin 66357095.jpg, In French Guiana Distribution Gold tegus live in the tropical forests of northern and central South America, as well as in Panama. Its South American range extends to the island of Trinidad. Diet They feed on insects, other invertebrates (such as snails), small mammals, other reptiles (such as smaller lizards and small snakes), birds, and fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Association For The Advancement Of Science
The American Association for the Advancement of Science (AAAS) is a United States–based international nonprofit with the stated mission of promoting cooperation among scientists, defending scientific freedom, encouraging scientific responsibility, and supporting science education, scientific education and science outreach for the betterment of all humanity. AAAS was the first permanent organization established to promote science and engineering nationally and to represent the interests of American researchers from across all scientific fields. It is the world's largest general scientific society, with over 120,000 members, and is the publisher of the well-known scientific journal ''Science (journal), Science''. History Creation The American Association for the Advancement of Science was created on September 20, 1848, at the Academy of Natural Sciences in Philadelphia, Pennsylvania. It was a reformation of the Association of American Geologists and Naturalists with the broaden ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambridge University Press
Cambridge University Press was the university press of the University of Cambridge. Granted a letters patent by King Henry VIII in 1534, it was the oldest university press in the world. Cambridge University Press merged with Cambridge Assessment to form Cambridge University Press and Assessment under Queen Elizabeth II's approval in August 2021. With a global sales presence, publishing hubs, and offices in more than 40 countries, it published over 50,000 titles by authors from over 100 countries. Its publications include more than 420 academic journals, monographs, reference works, school and university textbooks, and English language teaching and learning publications. It also published Bibles, runs a bookshop in Cambridge, sells through Amazon, and has a conference venues business in Cambridge at the Pitt Building and the Sir Geoffrey Cass Sports and Social Centre. It also served as the King's Printer. Cambridge University Press, as part of the University of Cambridge, was a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trevor Pinch
Trevor J. Pinch (1 January 1952 – 16 December 2021) was a British sociologist, part-time musician and chair of the science and technology studies department at Cornell University. In 2018, he won the J.D. Bernal Prize from the Society for Social Studies of Science for "distinguished contributions to Science and Technology Studies over the course of career." Life and career Pinch was born in Lisnaskea, Northern Ireland on the New Year's Day of 1952. He held a degree in physics Physics is the scientific study of matter, its Elementary particle, fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. "Physical science is that department of knowledge whi ... from Imperial College London and a PhD in sociology from the University of Bath. He taught sociology at the University of York before moving to the United States. Together with Wiebe Bijker, Pinch started the movement known as Social Constructi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harry Collins
Harry Collins, FLSW (born 13 June 1943), is a British sociologist of science at the School of Social Sciences, Cardiff University, Wales. In 2012 he was elected a Fellow of the British Academy. In 2013, he was elected a Fellow of the Learned Society of Wales. Career While at the University of Bath Professor Collins developed the Bath School approach to the sociology of scientific knowledge. In ''Changing Order: Replication and Induction in Scientific Practice'', Collins outlines a general theory of sociology of science. Drawing from the concepts of "Language Game" and "Forms of Life", derived from the philosopher Ludwig Wittgenstein, he seeks an explanation for how scientists follow rules and patterns when performing experiments and scientific practice. Collins' perspective is usually called a relativist position, although this is a strong oversimplification. Collins has written for over 30 years on the sociology of gravitational wave physics. His publications in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudocopulation
Pseudocopulation is a behavior similar to Copulation (zoology), copulation that serves a reproductive function for one or both participants but does not involve actual sexual union between the individuals. It is most generally applied to a pollinator attempting to copulate with a flower adapted to mimicry, mimic a potential female mate. The resemblance may be visual, but the key stimuli are often chemical and tactile. The form of mimicry in plants that deceives an insect into pseudocopulation is called Pouyannian mimicry after the French lawyer and amateur botanist Maurice-Alexandre Pouyanne. A non-mimetic form of pseudocopulation has been observed in some Parthenogenesis, parthenogenetic, all-female species of lizard. The behaviour does not appear to be necessary to trigger parthenogenesis. Definition In zoology, pseudocopulation is attempted Copulation (zoology), copulation that serves a reproductive function for one or both participants but does not involve actual sexual un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fertility
Fertility in colloquial terms refers the ability to have offspring. In demographic contexts, fertility refers to the actual production of offspring, rather than the physical capability to reproduce, which is termed fecundity. The fertility rate is the average number of children born during an individual's lifetime. In medicine, fertility refers to the ability to have children, and infertility refers to difficulty in reproducing naturally. In general, infertility or subfertility in humans is defined as not being able to conceive a child after one year (or longer) of unprotected sex. The antithesis of ''fertility'' is infertility, while the antithesis of ''fecundity'' is sterility. Demography In demographic contexts, fertility refers to the actual production of offspring, rather than the physical capability to produce which is termed fecundity. While fertility can be measured, fecundity cannot be. Demographers measure the fertility rate in a variety of ways, which can be broa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Mexico Whiptail
The New Mexico whiptail (''Aspidoscelis neomexicanus'') is a female-only species of lizard found in New Mexico and Arizona in the southwestern United States, and in Chihuahua in northern Mexico. It is the official state reptile of New Mexico. It is one of many lizard species known to be parthenogenetic. Individuals of the species can be created either through the hybridization of the little striped whiptail ('' A. inornatus'') and the western whiptail ('' A. tigris''), or through the parthenogenetic reproduction of an adult New Mexico whiptail. The hybridization of these species prevents healthy males from forming, whereas males exist in one parent species (see sexual differentiation). Parthenogenesis allows the all-female population to reproduce. This combination of interspecific hybridization and parthenogenesis exists as a reproductive strategy in several species of whiptail lizard within the genus '' Aspidoscelis'' to which the New Mexico whiptail belongs. Description Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fertilisation
Fertilisation or fertilization (see spelling differences), also known as generative fertilisation, syngamy and impregnation, is the fusion of gametes to give rise to a zygote and initiate its development into a new individual organism or offspring. While processes such as insemination or pollination, which happen before the fusion of gametes, are also sometimes informally referred to as fertilisation, these are technically separate processes. The cycle of fertilisation and development of new individuals is called sexual reproduction. During double fertilisation in angiosperms, the haploid male gamete combines with two haploid polar nuclei to form a triploid primary endosperm nucleus by the process of vegetative fertilisation. History In antiquity, Aristotle conceived the formation of new individuals through fusion of male and female fluids, with form and function emerging gradually, in a mode called by him as epigenetic. In 1784, Spallanzani established the need of in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meiosis
Meiosis () is a special type of cell division of germ cells in sexually-reproducing organisms that produces the gametes, the sperm or egg cells. It involves two rounds of division that ultimately result in four cells, each with only one copy of each chromosome (haploid). Additionally, prior to the division, genetic material from the paternal and maternal copies of each chromosome is crossed over, creating new combinations of code on each chromosome. Later on, during fertilisation, the haploid cells produced by meiosis from a male and a female will fuse to create a zygote, a cell with two copies of each chromosome. Errors in meiosis resulting in aneuploidy (an abnormal number of chromosomes) are the leading known cause of miscarriage and the most frequent genetic cause of developmental disabilities. In meiosis, DNA replication is followed by two rounds of cell division to produce four daughter cells, each with half the number of chromosomes as the original parent cell. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
