Download Morphology, Molecules, Evolution and Phylogeny in Polychaeta by Universität Osnabrück, Günter Purschke PDF

By Universität Osnabrück, Günter Purschke

Annelida, as a rule together with marine Polychaeta and in faunal and partially parasitic Clitellata, is one the main major metazoan taxa. Its greater than 20.000 defined species invade approximately all habitats and play a principal position in marine benthic structures in addition to in terrestrial soil groups. Annelids contain all soft-bodied segmented worm-like organisms and feature been well-known as a separate "phylum" for nearly 2 hundred years.

Recently, proof has been accrued which indicates that a number of the teams previously considered as self sustaining "phyla" equivalent to Pogonophora (now well-known as Siboglinidae), Echiura, Myzostomida and maybe Sipuncula, are most likely not anything else than drastically converted Annelida. the intense morphological range came across specifically in Polychaeta monitors the plasticity of an easy segmented supplier that actually is not anything else yet a serial repetition of exact devices. therefore, annelids are hugely very important to our realizing of primary questions about morphological and adaptive variety, in addition to clarifying evolutionary adjustments and phylogenetic relationships.

The ebook goals to summarize our wisdom on Polychaetes polychaetes and their allies and offers an outline of contemporary advances won by means of stories that hired traditional and smooth tools plus, more and more and importantly, using molecular markers and computer-assisted kinship analyses. It additionally displays the country of paintings in polychaete sciences and offers new questions and controversies. As such it is going to considerably impact the path of analysis on Polychaeta and their similar taxa.

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By Universität Osnabrück, Günter Purschke

Annelida, as a rule together with marine Polychaeta and in faunal and partially parasitic Clitellata, is one the main major metazoan taxa. Its greater than 20.000 defined species invade approximately all habitats and play a principal position in marine benthic structures in addition to in terrestrial soil groups. Annelids contain all soft-bodied segmented worm-like organisms and feature been well-known as a separate "phylum" for nearly 2 hundred years.

Recently, proof has been accrued which indicates that a number of the teams previously considered as self sustaining "phyla" equivalent to Pogonophora (now well-known as Siboglinidae), Echiura, Myzostomida and maybe Sipuncula, are most likely not anything else than drastically converted Annelida. the intense morphological range came across specifically in Polychaeta monitors the plasticity of an easy segmented supplier that actually is not anything else yet a serial repetition of exact devices. therefore, annelids are hugely very important to our realizing of primary questions about morphological and adaptive variety, in addition to clarifying evolutionary adjustments and phylogenetic relationships.

The ebook goals to summarize our wisdom on Polychaetes polychaetes and their allies and offers an outline of contemporary advances won by means of stories that hired traditional and smooth tools plus, more and more and importantly, using molecular markers and computer-assisted kinship analyses. It additionally displays the country of paintings in polychaete sciences and offers new questions and controversies. As such it is going to considerably impact the path of analysis on Polychaeta and their similar taxa.

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Additional info for Morphology, Molecules, Evolution and Phylogeny in Polychaeta and Related Taxa

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A PCR-based survey of homeobox genes in Ctenodrilus serratus (Annelida: Polychaeta). Molecular Phylogenetics and Evolution 3: 146–158. Dimpker, A. , 1918 Die Eifurchung von Herpobdella atomaria Carena (Nephelis vulgaris Moqu. ). Zoological Journal of Anatomy 40: 245–290. , 1999. The ancestral cleavage pattern of the clitellates and its phylogenetic deviations. Hydrobiologia 402: 267–283. Dorresteijn, A. W. , 1990. Quantitative analysis of cellular differentiation during early embryogenesis of Platynereis dumerilii.

Archiv fu¨r Entwicklungsmechanik der Organismen 9: 587–723. Delsman, H. , 1916. F. Mu¨ller. Tijdschrift van de Nederlandsche Dierkundige Vereeniging, 2. Ser 14: 283–498, pls 21–26. , 1898. Zur Entwicklungsgeschichte der Capitelliden. Mitteilungen aus der Zoologischen Station zu Neapel 13: 1– 292, pls 1–9. Foster, N. , 1917. Spionidae (Polychaeta) of the Gulf of Mexico and the Caribbean Sea. Studies on the Fauna of Curac¸ao 36: 1–183. Henry, J. J. & M. Q. Martindale, 1987. The organizing role of the D quadrant as revealed through the phenomenon of twinning in the polychaete Chætopterus variopedatus.

The undulating appearance of the fibrils in sections is due to a coiled structure of each fibril. Lepescheux (1988) could not observe endings of individual fibrils and thus assumes the fibrils to be coiled on a larger scale in running around the cylindrical bodysurface. In young larvae collagen fibrils may lack completely (Fig. 1K) or are very thin and irregularly arranged (Holborow & Laverack, 1969; Eckelbarger, 1978; Heimler, 1981; Heimler, 1983; Schlo¨tzer- Schrehardt, 1992). Thicker fibrils being organized in regular orthogonal grids are formed later during ontogenesis.

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