An Introduction to the Invertebrates
So much has to be crammed into today's biology courses that basic information on animal groups and their evolutionary origins is often left out. This is particularly true for the invertebrates. The second edition of Janet Moore's An Introduction to the Invertebrates fills this gap by providing a short updated guide to the invertebrate phyla, looking at their diverse forms, functions and evolutionary relationships. This book first introduces evolution and modern methods of tracing it, then considers the distinctive body plan of each invertebrate phylum showing what has evolved, how the animals live, and how they develop. Boxes introduce physiological mechanisms and development. The final chapter explains uses of molecular evidence and presents an up-to-date view of evolutionary history, giving a more certain definition of the relationships between invertebrates. This user-friendly and well-illustrated introduction will be invaluable for all those studying invertebrates.
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Chelicerata and Myriapoda
Invertebrate Chordata and
WHAT DO GENES TELLUS ABOUT RELATIONSHIPSBETWEEN THE EARLIEST PHYLA?
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adult animals annelids appendages aquatic arthropods bivalves blood body cavity brain Bryozoa burrowing cells Chapter 20 characters chelicerates chordates cilia cleavage Cnidaria coelom colony contraction convergence corals crustaceans ctenophores cuticle deuterostomes developmental diagram diversity dorsal Drosophila early echinoderms eggs evolution evolutionary evolved example feeding fertilisation Figure fluid fossils fresh water freshwater genetic gill haemocoel hermaphrodites Hox genes hydrostatic skeleton insects invertebrates ions large number larva layer length living locomotion longitudinal lophophores mantle cavity marine medusa mesoderm molecular evidence molluscs morphological moulting mouth muscle natural selection nematocysts nematodes nemertines nervous system occur oxygen pairs parasitic phyla phylogeny phylum platyhelminths polychaetes polyps posterior predators primitive proboscis protein protostomes radial reproduction resemblance respiratory segments sensory separate sessile shell skeleton specialised species sperm spicules spiders sponges stage starfish structure surface swimming tentacles terrestrial tissue triploblastic tube feet tubules unique ventral vertebrates wings worms
Page 2 - Malthus on Population, and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The result of this would be the formation of new species. Here, then, I had at last got a theory by which to work...
Page 8 - ... order with a tapering root. ACONITINE, a most virulent poison from aconite, and owing to the very small quantity sufficient to cause death, is very difficult of detection when employed in taking away life. ACORN-SHELLS, a crustacean attached to rocks on the sea-shore, described by Huxley as "fixed by its head," and "kicking its food into its mouth with its legs.