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Annelid   (Site not responding. Last check: 2007-10-06) The annelid fossil record is sparse, but a few definite forms are known as early as the Cambrian, and there are some signs they were around in the later Precambrian. A few small groups have been treated as separate phyla: the Pogonophora and Vestimentifera, now included in the family Siboglinidae, and the Echiura. The arthropods and their kin have long been considered the closest relatives of the annelids, on account of their common segmented structure, but a number of differences between the two groups suggest this may be convergent evolution. www.wikisearch.net /en/wikipedia/a/an/annelid.html   (538 words)

Siboglinidae - Wikipedia, the free encyclopedia Look for Siboglinidae in Wiktionary, our sister dictionary project. Look for Siboglinidae in the Commons, our repository for free images, music, sound, and video. If you have created this page in the past few minutes and it has not yet appeared, it may not be visible due to a delay in updating the database. www.wikipedia.org /wiki/Siboglinidae   (101 words)

Symbiont transmission in the hydrothermal vent tubeworms The uptake of symbionts in hydrothermal vent tubeworms (Vestimentifera, Siboglini­dae) is facilitated by massive infection of the skin and simultaneous apoptosis. The current hypothesis proposes that the transmission   and establishment of the symbiosis between hydrothermal vent tubeworms (Vestimentifera, Siboglinidae) and thiotrophic endosymbionts is by uptake of symbionts through the digestive system in early juveniles into endodermal mitgut cells, followed by proliferations and transformation of midgut cells into bacteriocytes, and development of the trophosome. Riftia pachyptila (Vestimentifera, Siboglinidae), but neither the content of these vesicles was analyzed, nor their density in the different morphotypes in different regions of the trophosome from different animals. www.promare.at /service/news/0404/digest/Monika_Halifax2003.htm   (1126 words)

Riftia is the largest of all Siboglinidae, reaching 1.5 m in length. Virtually all of their nutritional requirements are derived from the bacteria in the body, which can make up 15% of the animal's total body weight. The palps of project from the tube and are richly supplied with blood vessels that serve for the respiratory purposes of the worm, but also to transport the sulphide and carbon dioxide that are needed by the symbiotic bacteria. bugs.bio.usyd.edu.au /Polychaetes/riftia.htm   (91 words)

Pogonophora The Pogonophora, or beard worms, are a small group of deep sea tube worms[?] often found growing around warm springs. The rear of the body is segmented, and together with the Vestimentifera they have recently been regarded as a family of annelids, called the Siboglinidae[?], though they were earlier treated as a phylum. They appear to feed primarily on symbiotic bacteria living in their mouthless bodies. www.ebroadcast.com.au /lookup/encyclopedia/po/Pogonophora.html   (101 words)

Limnology and Oceanography Abstracts   (Site not responding. Last check: 2007-10-06) At Hook Ridge hydrothermal vent, a new species of Sclerolinum (Monilifera, Siboglinidae) was found at a water depth of 1,045 m. Comparison with geochemical data from other reducing sediments indicates that the two groups of Siboglinidae, Monilifera and Frenulata, occur in sediments with low sulfide concentration and flux. In contrast, sulfurbased chemosynthetic organisms that typically occur at hydrothermal vents and cold seeps (e.g., Vestimentifera, vesicomyid clams, and bacterial mats) occur in sediments with higher sulfide availability; threshold values are around 500 µmol L aslo.org /lo/toc/vol_50/issue_2/0598.html   (172 words)

CSIRO PUBLISHING - Australian Journal of Zoology   (Site not responding. Last check: 2007-10-06) Representatives of all of the major morphologically identified clades were used, as well as members of the Sipuncula, Echiura, Turbellaria, Clitellata and Siboglinidae (formerly the phyla Pogonophora and Vestimentifera). As suggested by some recent morphological and molecular analyses, Siboglinidae and Clitellata may well have sister groups among polychaetes. The morphologically aberrant Sternaspidae are closest to members of Terebellida in the present analyses, supporting the placement of Rouse and Fauchald. www.publish.csiro.au /nid/90/paper/ZO99026.htm   (340 words)

Deep-Sea Biology Guinot D, Hurtado LA, Vrijenhoek RC (2002) New genus and species of brachyuran crab from the southern East Pacific Rise (Crustacea Decapoda Brachyura Bythograeidae). Hurtado LA, Mateos M, Lutz RA, Vrijenhoek RC (2002) Molecular evidence for multiple species of Oasisia (Annelida: Siboglinidae) at eastern Pacific hydrothermal vents. Halanych K.M., Feldman R.A. and Vrijenhoek R.C. 2001 Molecular evidence that Sclerolinum brattstromi is closely related to vestimentiferens, not frenulate pogonophorans (Siboglinidae, Annelida). www.mbari.org /staff/vrijen/ventbib.htm   (1116 words)

Annelida   (Site not responding. Last check: 2007-10-06) From a molecular perspective, McHugh (1997) found Clitellata, Pogonophora (= Siboglinidae) and Echiura nested among various polychaetes using sequence data from elongation factor 1 alpha in a parsimony analysis (Fig. The placement by McHugh (1997) of Pogonophora as a polychaete group was congruent with Rouse and Fauchald’s (1997) results, but those of Clitellata and Echiura were markedly different. Rouse, G. A cladistic analysis of Siboglinidae Caullery, 1914 (Polychaeta, Annelida): formerly the phyla Pogonophora and Vestimentifera. tolweb.org /tree?group=Annelida&contgroup=Bilateria#TOC3   (2565 words)

Mag. Pflugfelder Bettina - Homepage Studies of Biology (Ecology/Zoology) with main focus on marine biology at the University of Vienna, Austria Mater thesis at the Dept. of Marine Biology on the elemental sulfur distribution in the endosymbionts of Riftia pachyptila (Vestimentifera, Siboglinidae) PhD thesis at the Dept. of Marine Biology on balance between proliferation and death- studies on the bacteriocyte and endosymbiont cell cycle in thiotrophic and methanotrophic Siboglinidae symbiosis www.univie.ac.at /marine-biology/staff-pflugfelder.htm   (264 words)

Riftia and hydrothermal vents Riftia pachyptila is one of the most spectacular members of Siboglinidae. Formerly ranked as a phylum, the clade Vestimentifera to which Riftia belongs, contains members that are usually found near hydrothermal vents or cold seeps. Other members of Siboglinidae, belonging to Frenulata are found associated with methane-seeps in sediments or with sunken wood. bugs.bio.usyd.edu.au /Polychaetes/riftia_and_hydrothermal_ve.htm   (68 words)

Phylogeny of the Annelida and allies   (Site not responding. Last check: 2007-10-06) Rouse and Fauchald in a later paper retracted Lamellisabellidae Uschakov, 1933 and substituted Siboglinidae Caullery, 1914 as the proposed name for pogonophorans inside Annelida. The Canalipalpata has three clades; the Sabellida (including the Siboglinidae) Spionida and Terebellida. Rouse presents the same higher classification, incorporates the pogonophorans as Family Siboglinidae within the polychaetes, and has Echiura retained outside annelids meantime. biodiversity.uno.edu /~worms/phylum-state.html   (5423 words)

research center ocean margins - Antonie Nolte   (Site not responding. Last check: 2007-10-06) Using nitrogen and carbon isotopic compositions of hard parts (e.g., tubes of vestimentiferan worms, shells of vesicomyid and bathymodiolin bivalves) of chemosymbiotic organisms as proxies for fluid compositions and seepage history Mechanisms of carbonate precipitation within the sediments related to the metabolic activity of vestimentiferan tubeworms (Siboglinidae); see Fig. 1: Siboglinidae with carbonate incrusting the posterior portion of the tubes www.rcom-bremen.de /English/Page2023.html   (94 words)

[No title]   (Site not responding. Last check: 2007-10-06) The Articulata is considered, on current evidence, to consist of four monophyletic groups; the Arthropoda, Clitellata, Polychaeta, and Pogonophora, though the latter group may be a clade of polychaetes. If this is shown the Pogonophora should revert to the original family name Siboglinidae Caulley 1914. Other recent hypotheses about the systematics of the Metazoa are assessed in The Rouse and Fauchald paper. www.bio.usyd.edu.au /Protsvil/annelid.htm   (195 words)

Fachgruppen der GfBS: Zoologen   (Site not responding. Last check: 2007-10-06) Recent phylogenetic analyses have led to profound changes in the view that the Annelida, as traditionally formulated, is a natural, monophyletic group. Both molecular and morphological analyses support placement of the Siboglinidae (formerly the Pogonophora) as a derived group within the Annelida; there is also evidence, based on molecular analysis of the nuclear gene elongation factor-1 alpha, that the unsegmented echiurids are derived annelids. While monophyly of the Clitellata is well-supported by both molecular and morphological analyses, there is no molecular evidence to support monophyly of the polychaete annelids; the Clitellata fall within a paraphyletic polychaete grade. biosys-serv.biologie.uni-ulm.de /gfbs/Fachgruppen/zool.html   (923 words)

Refereed Publications from Tunnicliffe Laboratory   (Site not responding. Last check: 2007-10-06) Schulze*, A. Plylogeny of Vestimentifera (Siboglinidae, Annelida) inferred from morphology. A new species of scaleworm (Polychaeta: Polynoidae) from Axial Volcano, Juan de Fuca Ridge, northeast Pacific. Schulze*, A. Histological and ultrastructural characterization of the intravasal body in Vestimentifera (Siboglinidae: Annelida). web.uvic.ca /~verenat/VTlab.html   (163 words)

ESA 2004   (Site not responding. Last check: 2007-10-06) ABSTRACT- Habitat provided by foundation species plays an important role in structuring communities in a variety of terrestrial, aquatic and marine habitats. At the basalt-hosted hydrothermal vents of the East Pacific Rise (∼ 2500 m depth), the giant tubeworm Riftia pachyptila (Polychaeta: Siboglinidae) forms large and dense aggregations in a spatially and temporally variable environment where sulfide concentrations can be up to 300 M and temperatures can range from 2 to 30°C. On the surfaces of the tubes, there is a higher density and diversity of fauna than on the surrounding rock substrate. abstracts.co.allenpress.com /pweb/esa2004/document?ID=41116   (364 words)

Molecular Evidence that Sclerolinum brattstromi Is Closely Related to Vestimentiferans, not to Frenulate Pogonophorans ... ( Southward, 1988), and originally Siboglinidae ( Caullery, 1914). Caullery, M. Sur les Siboglinidae, type nouveau d’invertébrés recueilli par l’expédition du Siboga. Evolutionary relationships of deep-sea hydrothermal vent and cold-water seep clams (Bivalvia: Vesicomyidae): results from mitochondrial cytochrome oxidase subunit I. Mar. Biol. www.biolbull.org /cgi/content/full/201/1/65   (4096 words)

The Biological Bulletin: Composition of a one-year-old Riftia pachyptila community following a clearance experiment: ...   (Site not responding. Last check: 2007-10-06) Composition of a one-year-old Riftia pachyptila community following a clearance experiment: insight to succession patterns at deep-sea hydrothermal vents. The Biological Bulletin; 12/1/2004; Fisher, C.R. In the basalt-hosted hydrothermal vent habitat around 9[degrees]50'N on the East Pacific Rise, the vestimentiferan tube-worms Tevnia jerichonana and Riftia pachyptila (Polychaeta: Siboglinidae) commonly settle before the mussel Bathymodiolus thermophilus (Bivalvia: Mytilidae). We removed six aggregations of R. pachyptila and deployed mussels on the cleared sources of diffuse flow to test the effect of the B. thermophilus on the subsequent colonization by the tubeworms. www.highbeam.com /library/doc0.asp?DOCID=1G1:127544771&refid=holomed_1&COOKIE=NO&token=B3B7818032E649E194CB15CB2985A661   (218 words)

Dr Greg Rouse   (Site not responding. Last check: 2007-10-06) A cladistic analysis of Siboglinidae Caullery, 1914 (Polychaeta, Annelida): formerly the phyla Pogonophora and Vestimentifera.Zoological Journal of the Linnean Society 132: 55-80. Rousset V, Rouse GW, Siddall ME, Tillier A, and Pleijel F. The phylogenetic position of Siboglinidae (Annelida), inferred from 18S rRNA, 28S rRNA, and morphological data. Assembling the Tree of Life.New York: Oxford University Press. www.ees.adelaide.edu.au /people/enviro/grouse01.html   (427 words)

RTI Poster Abstracts   (Site not responding. Last check: 2007-10-06) The widespread distribution of Thermococcales in subsurface environments shows that they might be true cosmopolitans and they may serve as a model for studying the transmission of thermophilic organisms in subsurface habitats. Evolution of vestimentiferan and perviate pogonophorans (Siboglinidae: Annelida) Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA Perviate pogonophorans and vestimentiferans are two groups of marine protostomes commonly referred to as tubeworms or beardworms. ridge.oce.orst.edu /meetings/biosphereRTI/RTIabs   (16720 words)

IMCS Publications Evolutionary age of vestimentiferan tubeworm lineages (Annelida: Siboglinidae). Sister-species of eastern Pacific hydrothermal-vent worms (Ampharetidae, Alvinellidae, Vestimentifera) provide new mitochondrial COI clock calibration. Kennish, M. Impacts of motorized watercraft on shallow estuarine and coastal marine environments. marine.rutgers.edu /pubs   (6987 words)

Molecular evidence that echiurans and pogonophorans are derived annelids -- McHugh 94 (15): 8006 -- Proceedings of the ... in the first species description for the group, the Siboglinidae Fundamentally different animal body plans, or phyla, constitute groups that are assumed to maintain their phylogenetic integrity Sperm Storage, Internal Fertilization, and Embryonic Dispersal in Vent and Seep Tubeworms (Polychaeta: Siboglinidae: Vestimentifera) www.pnas.org /cgi/content/full/94/15/8006   (2242 words)

Mitochondrial Genomes of Clymenella torquata (Maldanidae) and Riftia pachyptila (Siboglinidae): Evidence for Conserved ... Mitochondrial Genomes of Clymenella torquata (Maldanidae) and Riftia pachyptila (Siboglinidae): Evidence for Conserved Gene Order in Annelida -- Jennings and Halanych 22 (2): 210 -- Molecular Biology and Evolution Mitochondrial Genomes of Clymenella torquata (Maldanidae) and Riftia pachyptila (Siboglinidae): Evidence for Conserved Gene Order in Annelida Biology Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts; and mbe.oupjournals.org /cgi/content/abstract/22/2/210   (275 words)

The Sixth International: Zoology Archives She's a few cm long but her husbands--of whom she may have hundreds--are much smaller and live inside her, reduced to little more than sperm factories for her eggs. DNA analysis suggests that Osedax number among the Siboglinidae, related to those worms--whose pictures we've all seen--that live in the unbelievably hot and sulphurous waters round hydrothermal vents. Like Osedax, the vent worms have harnassed bacteria for a living, albeit in a very different way. www.6thinternational.org /zoology/index.html   (13963 words)

Mitochondrial Genomes of Clymenella torquata (Maldanidae) and Riftia pachyptila (Siboglinidae): Evidence for Conserved ... Mitochondrial Genomes of Clymenella torquata (Maldanidae) and Riftia pachyptila (Siboglinidae): Evidence for Conserved Gene Order in Annelida -- Jennings and Halanych, 10.1093/molbev/msi008 -- Molecular Biology and Evolution MBE Advance Access published online on October 13, 2004 Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543 USA mbe.oupjournals.org /cgi/content/short/msi008v1   (274 words)

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