Systematics
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In Kingdom Animalia, all taxa are eukaryotic and lack cell walls, multicellular, and generally heterotrophic. Evolutionary relationships among animals have been examined using fossil evidence, anatomy, development, and genetics. You should familiarize yourself with the major anatomical and developmental differences that define animal phyla. In this section, we will look at the simplest and earliest animals – those which have the simplest body structure and tissue organization. If you compare this phylogeny to the morphological phylogeny, you can see that certain relationships are similar.
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Taxonomy Phylogeny
Taxonomy of the bacteria was historically based on phenotypical physical and chemical characteristics – phenetic taxonomy. According to "Bergey's Manual of Systematic Bacteriology", all bacteria can be classified into four divisions , or phyla according to the constituents of their cell walls . Each division was further subdivided into sections according to :The Animal Kingdom is at once the Kingdom most and least familiar to us. Almost all of the animals we commonly think of -- mammals, fish, and birds -- belong to a single subgroup within one of the 33 Phyla comprising the Animal Kingdom. On the other hand, over 100,000 species in some 25 animal phyla -- mostly small worms -- are so unfamiliar that they are virtually unknown to non-scientists. The same goes for several hundred thousand tiny insect-like species populating the Arthropoda phylum.
Natural Perspective: Animal Kingdom
Confused by a class within a class or an order within an order ? Please see our brief essay . Scientific names for Aves taxonomy (family and below) are from The Howard and Moore Complete Checklist of the Birds of the World , Princeton University Press, copyright 2003. Used by permission.
ADW: Animalia: Classification
Anmerkung: Diese Darstellung gibt die derzeit in der Wikipedia verwendete Systematik der Tiere wieder. Da die biologische Systematik ein sehr dynamisches Forschungsfeld ist, kann die folgende Übersicht in ihren Details von anderen in der Literatur zu findenden Systemen abweichen. In dieser Systematik der Tiere soll eine Klassifikation aller Vielzelligen Tiere (Metazoa) bis auf alle rezenten Stämme vorgenommen werden.
Systematik der Vielzelligen Tiere – Wikipedia
