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
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.
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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.