Reconstructing Invertebrate Phylogeny: a Review of the Major Controversies 2004 (English)Independent thesis Basic level (degree of Bachelor)Student thesis

Abstract [en]

Reconstructing invertebrate phylogeny: a Summary When mapping invertebrate relationships, the first step is, of course, to realize the very existance of a phylogenetic tree; that is to understand that all living things are related to each other and form natural groups. The philosophical aspects of classification and systematics were to a great extent worked out by Aristotle, but modern biosystematics based on phylogeny starts with Darwin. When the first metazoans appeared is a matter of great dispute. This issue is close connected to the question if the main divergence of animal phyla took place at the beginning of Cambrian. The fossil record supports this concept of a “Cambrian explosion” but molecular data do not. The subsequent dichotomies in the invertebrate phylogenetic tree are reflected in the classification and systematics of higher taxa, but many recent studies show that characters thought to be homologous, in fact are the result of convergent evolution. Therefore, these characters should not have any systematic significans.

Place, publisher, year, edition, pages

2004.

Keywords [en]

Phylogeny, Invertebrates, Cambrian explosion, Dichotomy, Diploblast, Triploblast, Acoelomata, Coelomata, Protostoma, Deuterostoma, Ecdysozoa, Lophotrochozoa

Identifiers

URN: urn:nbn:se:hh:diva-12113Local ID: U11153OAI: oai:DiVA.org:hh-12113DiVA, id: diva2:367258

Uppsok

Life Earth Science

Note

Denna uppsats kan beställas från arkivet / This paper can be ordered from the archive. Kontakta / Contact: arkivet@hh.seAvailable from: 2010-11-09 Created: 2010-11-09 Last updated: 2025-10-01Bibliographically approved

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