Pogonophora (Annelida): form and function

Southward, Eve C.; Schulze, Anja; Gardiner, Stephen L.

doi:10.1007/1-4020-3240-4_13

Cited by 43 publications

(73 citation statements)

References 94 publications

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“…I have chosen to use the term siboglinid rather than pogonophoran to emphasize its placement within the annelid radiation. However others (e.g., Southward et al, 2005) retain the term 'Pogonophora' because of its familiarity. Field et al (1988) was the first molecular phylogenetic study addressing possible placement of the siboglinids within animal phylogeny.…”

Section: Are Siboglinids Annelids?mentioning

confidence: 97%

“…Also nomenclature and higher-level taxonomy have been hotly debated and confusingly inconsistent. Recent papers cover this topic in detail (e.g., Rouse & Fauchald, 1995;Halanych et al, 2002;Southward et al, 2005) and it will not be reiterated here. The definition of the three siboglinid clades (Vestimentifera, Frenulata, and Monilifera) follows Halanych et al (2001).…”

Section: Introductionmentioning

confidence: 94%

“…In the case of morphology, considerable information bears on the evolution of the group. This topic has been addressed in this volume by Southward et al (2005) who discuss similarities and differences between the groups. Readers interested in molecular evolutionary analyses of endosymbionts are referred to Feldman et al (1997), Di Meo et al (2000, Nelson & Fisher, (2000), and McMullin et al (2003) for vestimentiferans.…”

Section: Introductionmentioning

confidence: 98%

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Molecular phylogeny of siboglinid annelids (a.k.a. pogonophorans): a review

Halanych

2005

Hydrobiologia

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Siboglinid, or pogonophoran, annelids are tubicolous worms that rely on chemoautotrophic endosymbionts for nutrition. Three clades within the siboglinids are recognized: Frenulata, Vestimentifera, and Monilifera. As a group, these worms have received considerable attention from molecular phylogenetists. Most studies have focused either on the evolutionary origins of the group or on the relationships within vestimentiferans, which live at hydrocarbon seeps and hydrothermal vents. Here I review the literature to date on siboglinid molecular phylogeny and summarize the clade's evolution. The vestimentiferans have been well studied, especially in the eastern Pacific. The seep taxon Lamellibrachia is basal in the clade with vent species being more derived. Recent studies of seeps are finding new species and suggest that habitat depth can be correlated with species boundaries. In contrast to the vestimentiferans, frenulate evolution has been poorly studied. Despite their greater apparent diversity, frenulate specimens have not been sampled so extensively, and thus little is known about their evolution. Sclerolinum, also referred to as Monilifera, is a recognized genus of siboglinids that forms the sister group to Vestimentifera. Like the frenulates, little is known about the history of this group. Our present understanding of siboglinid phylogeny has, in large part, been dictated by insufficient sampling effort.

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Section: Are Siboglinids Annelids?mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 98%

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Molecular phylogeny of siboglinid annelids (a.k.a. pogonophorans): a review

Halanych

2005

Hydrobiologia

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“…These were not visible on video images due to their low abundance and small diametre. Tubeworms are regarded as indicator species for reduced environments because the known species harbour methane or sulphide oxidising symbionts, indicating sulphide and/or methane availability in the sediments (Southward et al, 1981(Southward et al, , 1986Schmaljohann and Flugel, 1987;Sibuet and Olu, 1998;Kimura et al, 2003;Southward et al, 2005). The central areas of Hesperides and Faro MV were littered with fragments of carbonate chimneys and carbonate crusts (shown for Hesperides MV, Fig.…”

Section: Field Observationsmentioning

confidence: 99%

Microbial methane turnover at mud volcanoes of the Gulf of Cadiz

Niemann

Duarte

Hensen

et al. 2006

Geochimica et Cosmochimica Acta

176

127

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“…In contrast to Clitellata, no polychaete taxon is known to date in which a digestive tract is completely absent. However, in Siboglinidae (formerly Pogonophora, now considered to belong to Polychaeta) it is highly modified to form the trophosome housing symbiotic bacteria (Southward et al, 2005) and in Parenterodrilus taenioides the gut is residual and non-functional (Jouin, 1979(Jouin, , 1992.…”

Section: Introductionmentioning

confidence: 99%

Pharynx and intestine

Tzetlin

Purschke

2005

Hydrobiologia

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The alimentary canal of polychaetes consists of a foregut, midgut, and hindgut. The alimentary canal shows different specializations even in homonomously segmented polychaetes. The foregut gives rise to the buccal cavity, pharnyx and oesophagus, the midgut may be divided into a stomach and the intestine proper. Since polychaetes use a wide spectrum of food sources, structures involved in feeding vary as well and show numerous specializations. In the foregut these specializations may be classified as one of the following types: dorsolateral folds, ventral pharynx, axial muscular pharynx, axial non-muscular proboscis and dorsal pharynx. The latter, typical of oligochaetous Clitellata, occurs rarely in polychaetes. The structure, evolution and phylogenetic importance of these different types are described and discussed. Axial muscular and ventral pharynges may be armed with jaws, sclerotized parts of the pharyngeal cuticle. Terminology, structure, occurrence and development of the jaws are briefly reviewed. Special attention has been paid to the jaws of Eunicida including extinct and extant forms. Conflicting theories about the evolution of the jaws in Eunicida are discussed. The epithelia of the intestine may form a pseudostratified epithelium composed of glandular cells, absorptive cells and ciliated cells or only one cell type having similar functions. A conspicuous feature in the intestine of certain polychaetes is the occurrence of unicellular tubular structures, called enteronephridia. So far these enteronephridia are only known in a few meiofauna species.

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Pogonophora (Annelida): form and function

Cited by 43 publications

References 94 publications

Molecular phylogeny of siboglinid annelids (a.k.a. pogonophorans): a review

Molecular phylogeny of siboglinid annelids (a.k.a. pogonophorans): a review

Microbial methane turnover at mud volcanoes of the Gulf of Cadiz

Pharynx and intestine

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