Download or read book A Revision of the American Funnel web Mygalomorph Spider Genus Euagrus Araneae Dipluridae written by Frederick A. Coyle and published by . This book was released on 1988 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The American diplurid genus Euagrus, distributed from Arizona south to Costa Rica, is revised for the first time. Euagrus is defined to include those euagrine diplurids with the following character states: no australotheline crescent; terminal cymbial spines; interlocking spinule patches on male femora I and II; a ventral, proximal, nonspatulate, tibia II mating apophysis with one or more large apical spines; two or three ventral mating keels on metatarsus II; no macrosetae brush on the prolateral surface of male tibia II; and two or more sclerotized stalks with unsclerotized bulbs on each (unsclerotized) spermathecal trunk. The relationships of Euagrus to other euagrine genera are discussed. A cladogram (based on outgroup comparison with the sister genus, Phyxioschema), a key, diagnoses, descriptions, tables of quantitative character values, illustrations, analyses of variation, natural history information, locality records, and distribution maps are provided for the 20 recognized species of Euagrus. Eight of these species are newly described: E. carlos, E. charcus, E. garnicus, E. gertschi, E. gus, E. leones, E. rothi, and E. zacus. Six specific names are newly synonymized: E. ravenus Gertsch and Mulaik, E. apacheus Gertsch and Mulaik, and E. ritaensis Chamberlin and Ivie with E. chisoseus Gertsch; E. empiricus Chamberlin and E. scepticus Chamberlin with E. josephus Chamberlin; and E. pragmaticus Chamberlin with E. rubrigularis Simon"--Page 205

Download or read book The Timetree of Life written by S. Blair Hedges and published by OUP Oxford. This book was released on 2009-04-23 with total page 575 pages. Available in PDF, EPUB and Kindle. Book excerpt: The evolutionary history of life includes two primary components: phylogeny and timescale. Phylogeny refers to the branching order (relationships) of species or other taxa within a group and is crucial for understanding the inheritance of traits and for erecting classifications. However, a timescale is equally important because it provides a way to compare phylogeny directly with the evolution of other organisms and with planetary history such as geology, climate, extraterrestrial impacts, and other features. The Timetree of Life is the first reference book to synthesize the wealth of information relating to the temporal component of phylogenetic trees. In the past, biologists have relied exclusively upon the fossil record to infer an evolutionary timescale. However, recent revolutionary advances in molecular biology have made it possible to not only estimate the relationships of many groups of organisms, but also to estimate their times of divergence with molecular clocks. The routine estimation and utilization of these so-called 'time-trees' could add exciting new dimensions to biology including enhanced opportunities to integrate large molecular data sets with fossil and biogeographic evidence (and thereby foster greater communication between molecular and traditional systematists). They could help estimate not only ancestral character states but also evolutionary rates in numerous categories of organismal phenotype; establish more reliable associations between causal historical processes and biological outcomes; develop a universally standardized scheme for biological classifications; and generally promote novel avenues of thought in many arenas of comparative evolutionary biology. This authoritative reference work brings together, for the first time, experts on all major groups of organisms to assemble a timetree of life. The result is a comprehensive resource on evolutionary history which will be an indispensable reference for scientists, educators, and students in the life sciences, earth sciences, and molecular biology. For each major group of organism, a representative is illustrated and a timetree of families and higher taxonomic groups is shown. Basic aspects of the evolutionary history of the group, the fossil record, and competing hypotheses of relationships are discussed. Details of the divergence times are presented for each node in the timetree, and primary literature references are included. The book is complemented by an online database (www.timetree.net) which allows researchers to both deposit and retrieve data.

Download or read book Arachnida Mygalomorphae Araneomorphae Pseudoscorpionida Amblypygi Palpigradi written by Main and published by BRILL. This book was released on 1985-12 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Population Biology of Atypoides Riversi O P Cambridge a Fossorial Mygalomorph Spider written by Leonard Stuart Vincent and published by . This book was released on 1980 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Zoogeography of Arachnida written by Petar Beron and published by Springer. This book was released on 2018-07-27 with total page 995 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume merges all geographical and paleogeographical data on all groups of the arachnofauna. The book features topics such as the ecological factors, climate and other barriers that influence the distribution of arachnida. It also elaborates on the characteristics of the distribution such as arachnida at high altitude (e.g. Himalaya), in caves, in polar regions and highlights differences between the arachnofauna of e.g. Mediterranean regions vs Central Europe, West African vs Indomalayan and more. Furthermore, amongst other topics the volume also includes chapters on the systems of arachnida, fossil orders, dispersal and dispersion, endemics and relicts, regional arachnogeography, cave and high altitude arachnida.

Download or read book Spider Silk written by Leslie Brunetta and published by Yale University Press. This book was released on 2010-06-08 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spiders, objects of eternal human fascination, are found in many places: on the ground, in the air, and even under water. Leslie Brunetta and Catherine Craig have teamed up to produce a substantive yet entertaining book for anyone who has ever wondered, as a spider rappelled out of reach on a line of silk, “How do they do that?” The orb web, that iconic wheel-shaped web most of us associate with spiders, contains at least four different silk proteins, each performing a different function and all meshing together to create a fly-catching machine that has amazed and inspired humans through the ages. Brunetta and Craig tell the intriguing story of how spiders evolved over 400 million years to add new silks and new uses for silk to their survival “toolkit” and, in the telling, take readers far beyond the orb. The authors describe the trials and triumphs of spiders as they use silk to negotiate an ever-changing environment, and they show how natural selection acts at the genetic level and as individuals struggle for survival.

Download or read book Common Spiders of North America written by Richard A. Bradley and published by University of California Press. This book was released on 2019-11-12 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spiders are among the most diverse groups of terrestrial invertebrates, yet they are among the least studied and understood. This first comprehensive guide to all 68 spider families in North America beautifully illustrates 469 of the most commonly encountered species. Group keys enable identification by web type and other observable details, and species descriptions include identification tips, typical habitat, geographic distribution, and behavioral notes. A concise illustrated introduction to spider biology and anatomy explains spider relationships. This book is a critical resource for curious naturalists who want to understand this ubiquitous and ecologically critical component of our biosphere.

Download or read book New Zealand Journal of Zoology written by and published by . This book was released on 1990 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Collected papers written by Alexander Petrunkevitch and published by . This book was released on 1923 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book From Observations to Optimal Phylogenetic Trees written by Pablo A. Goloboff and published by CRC Press. This book was released on 2022-07-22 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Taxonomists specializing in different groups once based phylogenetic analysis only on morphological data; molecular data was used more rarely. Although molecular systematics is routine today, the use of morphological data continues to be important, especially for phylogenetic placement of many taxa known only from fossils and rare or difficult to collect species. In addition, morphological analyses help identify potential biases in molecular analyses. And finally, scenarios with respect to morphology continue to motivate biologists: the beauty of a cheetah or a baobab does not lie in their DNA sequence, but instead on what they are and do! This book is an up-to-date revision of methods and principles of phylogenetic analysis of morphological data. It is also a general guide for using the computer program TNT in the analysis of such data. The book covers the main aspects of phylogenetic analysis and general methods to compare classifications derived from molecules and morphology. The basic aspects of molecular analysis are covered only as needed to highlight the differences with methods and assumptions for analysis of morphological datasets.

Download or read book New World Tarantulas written by Fernando Pérez-Miles and published by Springer Nature. This book was released on 2020-12-15 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Theraphosidae are the most famous and diverse mygalomorph spiders, and include some of the largest arachnids on earth. Their unique defense mechanisms, predatory tactics, reproductive strategies and ecological adaptations are displayed by a wide range of terrestrial, burrowing and arboreal species. These arachnids are familiar to the general public thanks to horror movies and a growing interest in tarantulas as pets; however, scientific information on the group is scattered throughout the literature and not easily available. This book reviews all major aspects of New World Theraphosid tarantulas and provides in-depth information on their evolution, taxonomy, behavior, physiology, ecology, reproduction, conservation and biogeography. As a comprehensive guide to the biology of tarantulas, it will appeal to researchers, students and terrarium hobbyists alike.

Download or read book New Zealand Journal of Zoology written by and published by . This book was released on 1990 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spiderwebs and Silk written by Catherine L. Craig and published by Oxford University Press. This book was released on 2003-08-21 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Links the molecular evolution of silk proteins to the evolution and behavioral ecology of web-spinning spiders and other arthropods. This book presents an integrated understanding of an interesting biological system at the molecular and organizational levels.

Download or read book Annals of the New York Academy of Sciences written by Thomas Lincoln Casey and published by . This book was released on 1925 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annihilation written by Michel Houellebecq and published by Farrar, Straus and Giroux. This book was released on 2024-10-08 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: Michel Houellebecq’s international bestseller— a thrilling, ambitious, and unexpectedly tender chronicle of modern existence. It is 2027. France is in a state of economic decline and moral decay. As the country plunges into a contentious presidential race, the government falls victim to a series of mysterious and unsettling cyberattacks in which videos of brutal decapitations and skillfully crafted deepfakes proliferate on the web. Paul Raison’s own troubles are bound up with those of the country. He is an adviser to the finance minister; his wife, Prudence, is a Treasury official; and his father, Édouard, now retired, spent his career in the security services. Paul, badly overworked, is facing the threat of separation from his wife. When his father suddenly suffers a stroke, Paul must depart Paris for his provincial hometown, where he and his siblings now have the opportunity to repair their strained relationships with Édouard as they determine to free him from the decrepit public nursing home where he is wasting away. Michel Houellebecq’s Annihilation reveals a new dimension of his oeuvre, adding compassion and tenderness to the irony and cutting insight that brought him international fame. Here, we see France’s most celebrated novelist taking stock of his country on the eve of great change—asking how, and whether, a society and its people can change course.

Download or read book Arachnid reprints written by and published by . This book was released on 1907 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spider Webs written by William Eberhard and published by University of Chicago Press. This book was released on 2020-12-22 with total page 679 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this lavishly illustrated, first-ever book on how spider webs are built, function, and evolved, William Eberhard provides a comprehensive overview of spider functional morphology and behavior related to web building, and of the surprising physical agility and mental abilities of orb weavers. For instance, one spider spins more than three precisely spaced, morphologically complex spiral attachments per second for up to fifteen minutes at a time. Spiders even adjust the mechanical properties of their famously strong silken lines to different parts of their webs and different environments, and make dramatic modifications in orb designs to adapt to available spaces. This extensive adaptive flexibility, involving decisions influenced by up to sixteen different cues, is unexpected in such small, supposedly simple animals. As Eberhard reveals, the extraordinary diversity of webs includes ingenious solutions to gain access to prey in esoteric habitats, from blazing hot and shifting sand dunes (to capture ants) to the surfaces of tropical lakes (to capture water striders). Some webs are nets that are cast onto prey, while others form baskets into which the spider flicks prey. Some aerial webs are tramways used by spiders searching for chemical cues from their prey below, while others feature landing sites for flying insects and spiders where the spider then stalks its prey. In some webs, long trip lines are delicately sustained just above the ground by tiny rigid silk poles. Stemming from the author’s more than five decades observing spider webs, this book will be the definitive reference for years to come.