Showing posts with label Gastrotricha. Show all posts
Showing posts with label Gastrotricha. Show all posts
Tuesday, December 15, 2009
Saturday, April 25, 2009
Wednesday, January 07, 2009
Friday, September 05, 2008
Todaro's publications...
Visit the Gastrotrich World Portal on the link:
There you'll find about 70 publications all available in PDF format!!!
Tuesday, August 05, 2008
Gastrotrichs' Bibliography!
If you're looking for information on Gstrotrichs visit this page on Gastrotrich World Portal: http://www.gastrotricha.unimore.it/bibliogastro.htm
"A bibliography of Gastrotricha emphasizing systematics, ecology and reproduction..." (M. A. Todaro)
For recent publications visit: http://www.gastrotricha.unimore.it/news.htm
Sunday, April 20, 2008
GASTROTRICH BOOK CHAPTER
BOOK CHAPTER: Global diversity of gastrotrichs (Gastrotricha) in fresh waters
Maria Balsamo, Jean-Loup d’Hondt, Jacek Kisielewski and Lara Pierboni
Book Series Developments in Hydrobiology - Volume 198
Book: Freshwater Animal Diversity Assessment
Publisher Springer Netherlands - ISBN 978-1-4020-8258-0(Print)978-1-4020-8259-7(Online)
DOI 10.1007/978-1-4020-8259-7_10 -Pag 85-91
Abstract
The global diversity of inland water Gastrotricha is poorly known, and information is extremely heterogeneous. Gastrotricha have been studied most widely in Europe and America, whereas data from the other continents are scattered or not even available. This scanty information is related to several reasons, first of which is the technical difficulty in collecting and studying microscopic and soft-bodied species. In addition, the research has been limited mostly to the epibenthos and periphyton in lentic waters, and the gastrotrich taxonomy is still under discussion mainly because of the great intraspecific variability. Three of the five freshwater families are widespread or cosmopolitan, and most genera have been reported from at least two continents. There is strong evidence of a high diversity in genera and species in tropical areas. Nearly a half of the freshwater species are known from only one country or even only from one site, but the insufficient faunistic knowledge does not allow defining them as endemic. The phylogenetic relationships and possible evolutionary trends of inland water species of Gastrotricha are outlined.
Keywords Gastrotricha - Chaetonotida - Freshwater species - Global biodiversity - Geographic distribution
Maria Balsamo, Jean-Loup d’Hondt, Jacek Kisielewski and Lara Pierboni
Book Series Developments in Hydrobiology - Volume 198
Book: Freshwater Animal Diversity Assessment
Publisher Springer Netherlands - ISBN 978-1-4020-8258-0(Print)978-1-4020-8259-7(Online)
DOI 10.1007/978-1-4020-8259-7_10 -Pag 85-91
Abstract
The global diversity of inland water Gastrotricha is poorly known, and information is extremely heterogeneous. Gastrotricha have been studied most widely in Europe and America, whereas data from the other continents are scattered or not even available. This scanty information is related to several reasons, first of which is the technical difficulty in collecting and studying microscopic and soft-bodied species. In addition, the research has been limited mostly to the epibenthos and periphyton in lentic waters, and the gastrotrich taxonomy is still under discussion mainly because of the great intraspecific variability. Three of the five freshwater families are widespread or cosmopolitan, and most genera have been reported from at least two continents. There is strong evidence of a high diversity in genera and species in tropical areas. Nearly a half of the freshwater species are known from only one country or even only from one site, but the insufficient faunistic knowledge does not allow defining them as endemic. The phylogenetic relationships and possible evolutionary trends of inland water species of Gastrotricha are outlined.
Keywords Gastrotricha - Chaetonotida - Freshwater species - Global biodiversity - Geographic distribution
SEARCH INSIDE THIS BOOK AT:
http://www.amazon.com/gp/reader/1402082584/ref=sib_dp_pt#reader-link
Monday, January 08, 2007
Gastrotricha
Gastrotricha...
Members of this phylum are small, strap or tenpin-shaped, acoelomate worms. Most adults are less than 1 mm in length, some species are less than 100 um, and others exceed 3 mm. The body is flattened ventrally and arched dorsally. It is divided into two regions, the head and trunk which are often externally indistinct. The head bears the mouth, a tubular nematode-like pharynx, and the brain. The trunk contains a straight tubular gut and the reproductive organs, and bears the inconspicuous ventral anus. All gatrotrichs have ventral locomotory cilia and, with them, glide smoothly over the substratum. When disturbed they adhere with adhesive papillae, which are often numerous.
Gastrotrichs can be distinguished from other vermiform ciliated micrometazoans by a combination of features. They glide smoothly over the substratum and do not typically writhe from side to side as is typical, for example, of flatworms. The gastrotrich mouth is anterior or, terminal, or slightly subterminal unlike that of most turbellarians and gnathostomulids in which it is ventral. The gastrotrich pharynx resembles that of nematodes, with which they are not easily confused, and is unlike those of turbelarians, annelids, and gnathostomulids. The larger gastrotrichs, which include most macrodasyidans and a few chaetonotidans, are simultaneous hermaphrodites. Small species, which include most chaetonotidans, reproduce by parthenogenesis although sometimes vestigial testes may be present. As far as is known, hermaphroditic gastrotrichs copulate as reciprocally cross-fertilize.
Thursday, November 30, 2006
Video Gastrotricha
We got a video showing Gastrotricha's locomotion!
Click here to watch it!
Thanks Viviane Lira for the hint and the video!!!
Keep contributing!!!
Click here to watch it!
Thanks Viviane Lira for the hint and the video!!!
Keep contributing!!!
Subscribe to:
Posts (Atom)
