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Polychaetes are very common marine worms belonging to the Annelid family that are of interest to marine biologists and invertebrate zoologists. The book presents an understanding of the biology of this group with many illustrations.
Annelids (the segmented worms) exist in a remarkably diverse range of mostly marine but also freshwater and terrestrial habitats, varying greatly in size and form. This text provides. This text begins with an introduction to the phylum and an outline of annelid taxonomy. The book describes their collection and the methods to ensure their optimal preservation, and provides an overview of anatomy with its relevant terminology. It includes the latest molecular phylogenomic evidence and is organised based on a new, robust phylogenetic hypothesis. It looks at groups which include Clitellata (comprising more than a third of total annelid diversity), Sipuncula, and Thalassematidae (formerly Echiura). It reflects the enormous amount of research on these organisms that has burgeoned since the millennium, principally due to their use as model organisms to address wider and more general evolutionary and ecological questions.
"As the co-discoverer of the first known burrowing dinosaur and a popular science author, Anthony J. Martin is an expert at explaining his fossil-finding work to broad audiences. In this engaging book, Martin uses modern and fossil traces to introduce readers to a menagerie of animals and other lifeforms that dig, crunch, bore, and otherwise reshape our planet. We meet elephants that dig ballroom-sized caves alongside volcanoes, parrotfishes that chew coral reefs and poop out sandy beaches, dinosaur-eating crocodiles, and moon snails that drill into clams, or even other moon snails. In a detective story that spans millions of years, ranging from microbes to whales, Martin shows how when life got hard, life got boring, using bodies and behavior to hide, eat, attack, and defend, affecting both our world and our understanding of evolution, climate, and life itself"--
The work at hand consists of abstracts of Prerogative Court of Maryland records for the period 1658 to 1674. Author V.L. Skinner has combed through administration bond, will, inventory, administration account, and final balance entries to produce this collection. The abstracts are arranged in chronological order by court session, and in every instance they give the names of the principals (testators, heirs, witnesses, administrators, and so forth). In many cases we also learn the details of bequests, names of slaves, appraisers, and more.
"In The Invertebrate Tree of Life, Gonzalo Giribet and Gregory Edgecombe, leading authorities on invertebrate biology and paleontology, utilize phylogenetics to trace the evolution of animals from their origins in the Proterozoic to today. Phylogenetic relationships between and within the major animal groups are based on the latest molecular analyses, which are increasingly genomic in scale and draw on the soundest methods of tree reconstruction. Giribet and Edgecombe evaluate the evolution of animal organ systems, exploring how current debates about phylogenetic relationships affect the ways in which aspects of invertebrate nervous systems, reproductive biology, and other key features are i...
Based on documents from two Suffolk villages, this study examines the operation of the poor law and the individual effort the elderly poor needed to make to survive.
Editors: May 1749-Sept. 1803, Ralph Griffiths; Oct. 1803-Apr. 1825, G. E. Griffiths.
"The evolution of the eye spans 3.75 billion years from single cell organisms with eyespots to Metazoa with superb camera style eyes. At least ten different ocular models have evolved independently into myriad optical and physiological masterpieces. The story of the eye reveals evolution's greatest triumph and sweetest gift. This book describes its journey"--Provided by publisher.