Errantia. Most are vagile predators, others adopt a burrowing mode of life.

Les Polychètes errants (Errantia) constituent une des deux classes de vers de l'embranchement des Polychètes, constituée de vers mobiles, pourvus d'appendices de locomotion et d'une tête différenciée (le plus souvent munie d'yeux et de dents) . Subclass 1. Gonads temporary and in many segments.Polychaeta divided into two subclasses, Errantia and sedentaria after Fauvel (1959). Frouws, Anna M. Check if you have access via personal or institutional loginCOPYRIGHT: © Marine Biological Association of the United Kingdom 1968Journal of the Marine Biological Association of the United Kingdom

The division of Annelida into Polychaeta and Oligochaeta goes back to Grube (1850), retaining the division Githaiga, Michael N. Check if you have access via personal or institutional loginJournal of the Marine Biological Association of the United Kingdom Polychaeta divided into two subclasses, Errantia and sedentaria after Fauvel (1959). While this is the most widely used system of ordinal classification, it is generally agreed that it is an unnatural one. 2018.

Errantia, occasionally Aciculata, is a subclass of polychaete worms. Digestion is entirely extracellular.Respiration occurs through moist skin or gills of parapodia and head.The blood vascular system is a closed type.

Ectoparasitic blood-sucking leeches.Each typical body segment consists of 5 rings or annuli.Anterior suckers with 3 jaws, 1 median dorsal and 2 ventrolateral.Pharynx non- protrusible. viii + 878.

Asexual reproduction is not known.Mostly ectoparasitic, blood-sucking or carnivorous.

2019. Order Errantia and Sedentaria Polychaetes can be separated into two large orders, Errantia and Sedentaria, based on the development of the anterior appendages and life habits. Dorvilleidae Chamberlin, 1919; Eunicidae Berthold, 1827; Hartmaniellidae Imajima, 1977; Lumbrineridae Schmarda, 1861

L'autre classe est constituée de vers sessiles, les Sedentaria.

Pp. Errantia included the more vagile forms and Sedentaria the more or less sessile, often microphagous annelid groups. Errant Polychaetes are active swimmer or crawler while Sedentary Polychaetes are burrowers or tube dwellers.

No teeth but one ore two styles may be present.External segmentation is slightly marked by faint, while internal segmentation is marked by coelomic septa.Jordan EL and Verma PS. Few are marine, freshwater or terrestrial.The body is elongated and usually flattened and dorso-ventrally or cylindrical.The body consists of a fixed number of segments (33). Kairo, James G. The Polychaeta have traditionally been divided into free-living and sedentary forms, the Errantia and Sedentaria respectively. Close this message to accept cookies or find out how to Email your librarian or administrator to recommend adding this journal to your organisation's collection.Email your librarian or administrator to recommend adding this journal to your organisation's collection.Full text views reflects the number of PDF downloads, PDFs sent to Google Drive, Dropbox and Kindle and HTML full text views.Abstract views reflect the number of visits to the article landing page. Frouws, Anna M. Les Polychètes sédentaires (Sedentaria) constituent une des deux classes de vers polychètes, constituée de vers sessiles, dépourvus d'appendices de locomotion, souvent tubicoles et généralement équipés d'organes filtreurs dont ils se servent pour se nourrir.

Mostly well-developed in leeches. Amphinomidae Savigny in Lamarck, 1818; Euphrosinidae Williams, 1851; Order Eunicida. Segmentation similar, except at anterior and posterior ends. Githaiga, Michael N. fertilization external (in cocoon); no larval stage.The gizzard is poorly developed, non-muscular or absent.The clitellum is simpler consists of a single layer of cells and situated far towards.Male reproductive openings lie in front of female reproductive openings.The clitellum is composed of two or more layers of cells and never begins before twelfth segments.Vasa differentia are elongated extending over 3 or 4 segments.Reproduction sexual. A Monograph on the Polychaeta of Southern Africa Part 1, Errantia: Part 2, Sedentaria Published by the Trustees of the British Museum (Natural History), London, 1967 Publication no.

There is no acceptable ordinal classification for the Polychaeta; the class is divided into Errantia and Sedentaria for convenience but genera belonging to each subclass may not be related. and hermaphroditic or sexes separate cleavage spiral and determinate; dioecious or unisexual form also present.Their development is direct in monoecious form but indirect in dioecious form.Larva, when present is a trochophore is characteristics in case of indirect development, while in others this stage is passed through development.About 8,700 known species of Annelida are divided into four main classes, primarily on the basis of presence and absence of parapodia, setae, metameres, and other morphological features.Head consists of prostomium and peristomium and bears eyes, tentacles cirri, and palps.Cirri or branchiae or both may be present for respiration.The coelom is spacious usually divided by intersegmental septa.The alimentary canal provided with the eversible buccal region and protrusible pharynx.The excretory organ is segmentally paired nephridia.Sexes separate. Each segment breaks up into 2 to 4 rings or annuli.Both anterior and posterior ends of the body with ventrally situated suckers.The mouth opens on the ventral surface on anterior suckers, while anus opens dorsal to the posterior suckers.Coelom much reduced due to filling by botryoidal tissues, and form haemocoelomic sinuses.Hermaphrodite with one male and one female gonopore.They are primitive, without anterior suckers, proboscis, and jaws.Double rows of setae are present in 5 anterior segments.The body cavity is spacious and incompletely divided by septa.The vascular system consists of the dorsal and ventral vessels.Nephridial opening situated on the surface between the segments.Parasites on snails, frogs and fishes, marine and freshwater form.Each typical body segment consists of 3,6 or 12 rings.The mouth is a small median aperture situated in the anterior suckers.Blood vascular system separated from coelomic sinuses.Freshwater and terrestrial form.

The Differences Between Errants and Sedentries Huxham, Mark 14th Edition. Huxham, Mark

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