A Dictionary of Zoology by Michael Allaby

By Michael Allaby

This dictionary is a accomplished and updated reference paintings on all features of the learn of animals. Now absolutely revised for this re-creation, with over 5,000 entries, it's excellent for college kids and may be useful to beginner naturalists and all people with an curiosity within the topic. Key gains of this moment version: * broad insurance together with animal habit, ecology, body structure, genetics, cytology, evolution, Earth background, zoogeography * complete taxonomic assurance of arthropods, different invertebrates, fish, reptiles, amphibians, birds, and mammals * thoroughly revised to include the new discovery of 'extremophiles'--organisms dwelling in environments previously thought of impossibly hostile--and the taxonomic reclassification that this has entailed * New entries on genetics, evolutionary stories, and mammalian body structure

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Salmon and lamprey).  See also AMPHIDROMOUS; DIADROMOUS. anaerobe See ANAEROBIC (2).  Of a process: one that can occur only in the absence of oxygen. anagenesis In the original sense, evolutionary advance; the term is now often applied more widely, to virtually all sorts of evolutionary change, along a single, unbranching lineage.  It plays an important role in the swimming movements of sharks and bony fish.  Thus the wings of birds and insects are analogous. analysis of variance A statistical procedure that is used to compare more than two means.

Animal behaviour See ETHOLOGY. animalcule An old name for a microscopic, animal­like organism, particularly a protozoon.  The oldest fossils are burrows of a *coelomate in rocks rather less than 700 Ma old.  These two poles form the anchor points from which *spindle fibres extend to attach to the *centromere of each of the two *homologous chromosomes during cell division. animal starch See GLYCOGEN. anls (Crotophaga) See CUCUUDAE. aniso­ Prefix meaning unequal, from the Greek an and isos, 'not' and 'equal'.

There are 4000 species.  There are about 130 species, found in America, the Mediterranean region, and Africa.  *Cladoselache). Compare HYOSTYLY.  The family is mainly tropical, and 19 extant species have been described.  These disjunctions probably arose in the *Pleistocene when the climatic belts were telescoped, and migration across the Equator would have been easier.  There is a single genus, Amphiuma, and three species, occurring in freshwater swamps in the south­eastern USA.  There are about 160 species, mainly tropical.

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