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 Evolution of Primary Sexual Characters in Animals written by Janet Leonard and published by Oxford University Press. This book was released on 2010-07-19 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: Primary sexual traits, those structures and processes directly involved in reproduction, are some of the most diverse, specialized, and bizarre in the animal kingdom. Moreover, reproductive traits are often species-specific, suggesting that they evolved very rapidly. This diversity, long the province of taxonomists, has recently attracted broader interest from evolutionary biologists, especially those interested in sexual selection and the evolution of reproductive strategies.Primary sexual characters were long assumed to be the product of natural selection, exclusively. A recent alternative suggests that sexual selection explains much of the diversity of "primary" sexual characters. A third approach to the evolution of reproductive interactions after copulation or insemination has been to consider the process one of sexual conflict. That is, the reproductive processes of a species may reflect, as does the mating system, evolution acting on males and on females, but in different directions.In this volume, authors explore a wide variety of primary sexual characters and selective pressures that have shaped them, from natural selection for offspring survival to species-isolating mechanisms, sperm competition, cryptic female choice and sexual arms races. Exploring diverse reproductive adaptations from a theoretical and practical perspective, The Evolution of Primary Sexual Characters will provide an unparalleled overview of sexual diversity in many taxa and an introduction to the issues in sexual selection that are changing our view of sexual processes.
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.
Download or read book Behaviour and Ecology of Spiders written by Carmen Viera and published by Springer. This book was released on 2017-11-02 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within the last few decades, arachnology in the Neotropical region has experienced a great development filling the knowledge gap in one of the most diverse regions of the world. Nevertheless, large geographical areas remain poorly sampled, especially within the Amazon, and new genera and species have been continuously discovered, even in urban areas. In congruence with the recent improvements in research, several aspects of the ecology, behaviour and natural history of spiders, such as interactions with other predators and parasitoids, social interactions, dispersal patterns, habitat requirements, mating behaviors, among others, are being carefully investigated. These recent contributions incorporate substantial information on the preexisting knowledge on these subjects every year. Our main objective with this book is to present a summary on these new researches and on the currently knowledge on the main subjects involved in the general theme, emphasizing the contribution of the rich fauna of the Neotropical region to the research of behaviour and ecology of the spiders.
Download or read book Bulletin of the American Museum of Natural History written by Joel Asaph Allen and published by . This book was released on 1995 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprises articles on geology, paleontology, mammalogy, ornithology, entomology and anthropology.
Download or read book Spider Genera of North America written by Vincent D. Roth and published by . This book was released on 1993 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Insects of the Texas Lost Pines written by Stephen Welton Taber and published by Texas A&M University Press. This book was released on 2003 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation In an isolated pine forest on the eastern edge of Central Texas, there lies an island of abundant and diversified life known as the Lost Pines, the western-most stand of the loblolly pine. This 100,000-acre island includes portions of Bastrop and Buescher state parks. It was here that Stephen Welton Taber and Scott B. Fleenor encountered insect life of astonishing diversity. Setting out to identify and describe the insects and related animals most readily observed in the Lost Pines, they also discovered some hidden, rare, and never-before-described species. The result is this book, a bestiary of more than 280 species of invertebrates including insects, millipedes, centipedes, spiders, scorpions, mollusks, and worms. Each species description includes common and scientific names; information on biology, distribution, and similar species; and the authors' special remarks. The next time you visit Bastrop State Park, turn over a few logs, look at the ants, and don't swat the flies. Take along this newguide and open up a world of life in one of Texas' most unique and popular landscapes.
Download or read book Memoirs of the Queensland Museum written by and published by . This book was released on 1995 with total page 990 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Spider Taxonomy 1988 1991 written by Norman I. Platnick and published by American Museum of Natural History. This book was released on 1993 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecophysiology of Spiders written by Wolfgang Nentwig and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently another book on insect physiology was published. It was restricted to a few focal points as are many of these new insect physiology books, but there was considerable depth in its specialized point of view. We were dis cussing the structure of this book and of insect physiology books, in general, when Prof. Remmert asked me " . . . and what about books on spider physio logy?" Silence. Then I started to explain "oh yes, there is a congress pro ceedings volume on this topic and there is a group with excellent publica tions on another topic . . . ", but I felt that this answer was weak. One can no longer buy the proceedings volume in a bookshop and to read a series of publications on a given topic one must search in a library for a dozen journals. Why is there not a single book on spider physiology comparable with the many books on insect physiology? Are spiders a scientific ivory tower, far from public interest and commercial importance? I do not think so, although spiders are one of the many "forgotten" animal groups which always grew in the shadow of the insects. There are research groups working on spider physiology, there are fascinating phenomena in this animal group and there are plenty of exciting results. Spiders may have been always underresearch ed, but research is progressing. In the last few years, new books have been published, e. g.
Download or read book Bulletin British Arachnological Society written by British Arachnological Society and published by . This book was released on 1989 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annual Report of the American Museum of Natural History written by American Museum of Natural History and published by . This book was released on 1984 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Field Guide to Spiders Scorpions of Texas written by J. A. Jackman and published by Butterworth-Heinemann. This book was released on 1997 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spiders & Scorpions are classified into more than 45 families in this guide with close up examination of more than 125 species.
Download or read book Liste des travaux arachnologiques written by and published by . This book was released on 1988 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Records of the Australian Museum written by Australian Museum and published by . This book was released on 2010 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1989 with total page 1738 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agrindex written by and published by . This book was released on 1988 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:
