Download Grzimek's Animal Life Encyclopedia. Protostomes by Michael Hutchins PDF

By Michael Hutchins

V. 1. reduce metazoans and lesser deuterostomes / Neil Schlager, editor -- v. 2. Protostomes / Neil Schlager, editor -- v. three. bugs / Neil Schlager, editor -- v. 4-5. Fishes I-II / Neil Schlager -- v. 6. Amphibians / Neil Schlager, editor -- Reptiles / Neil Schlager, editor -- v. 8-11. Birds I-IV / Donna Olendorf, venture editor -- v. 12-16. Mammals I-V -- v. 17. Cumulative index.; ''This is a revised and up-to-date version of 1 of the main authoritative and complete assets at the world's animals. just like the 1st version written by way of famous zoologist Bernard Grzimek and released in 1972, the second one version covers all kinds of animals in geographic parts world wide. It contains top of the range photos and illustrations and a finished index to all volumes.''--''The best 20 Reference Titles of the Year,'' American Libraries, could 2004

Show description

Read Online or Download Grzimek's Animal Life Encyclopedia. Protostomes PDF

Best entomology books

A Textbook of Agricultural Entomology

A whole knowing of the biology and existence histories of pest species is essential for all these eager about crop creation and crop defense. this crucial new name offers complete assurance of significant insect and mite pest species, essentially in Northern Europe. Textbook of Agricultural Entomology is generally divided into components.

Insect Conservation: A Handbook of Approaches and Methods (Techniques in Ecology and Conservation)

With as much as 1 / 4 of all insect species heading in the direction of extinction over the following few many years, there's now a urgent have to summarize the ideas on hand for measuring insect range so that it will improve powerful conservation innovations. Insect Conservation outlines the most tools and methods to be had to entomologists, offering a complete synthesis to be used through graduate scholars, researchers and working towards conservationists around the globe.

A Survey of the Lepidoptera, Biogeograhy and Ecology of New Caledonia

I spent 4 months in New Caledonia in 1971 with the article of creating a quantitative survey of the night-flying macrolepidoptera with light-traps and an evaluation of the Rhopalocera and microlepidoptera. This fieldwork was once financed via a central authority Grant-in-Aid for medical Investigations adminis­ tered by means of the Royal Society, and by means of a furnish from the Godman Fund.

Additional info for Grzimek's Animal Life Encyclopedia. Protostomes

Example text

For example, male squids (phylum Mollusca) use a modified arm to place a loaded spermatophore inside the mantle cavity of a female. Some hermaphroditic leeches (phylum Annelida) actually spear their mating partner through the skin with a dartlike spermatophore, which slowly injects the sperm through the body wall following copulation. In almost all cases, whether by sperm or spermatophore transfer, copulation is followed by internal fertilization, and at least some degree of internal development.

The gonads are generally tubular throughout the phylum, but the tubes are generally regionally modified to perform a variety of sophisticated functions. Sperm and oocytes typically develop inside complex follicles from which they derive materials prior to fertilization, which is typically internal in all environments. Cleavage may be holoblastic, as in most spiders, millipedes, and crustaceans. Insects and some other groups, however, have such large yolk reserves that holoblastic cleavage is impossible, and these exhibit superficial cleavage around the central yolk mass.

Their lifestyles, origins and diversity all have underlying structures and functions that depend on the interactions between abiotic (nonliving) and biotic (living) components of the environment both past and present. From the fossil record, protostomes first appeared about 600 million years ago, although researchers believe that many of the early members of this group became extinct. Those few that did survive, however, evolved and radiated, or diversified, into the variety of protostomes that biologists recognize today.

Download PDF sample

Rated 4.27 of 5 – based on 4 votes