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They lack lungs. An Example of Phylum Annelida: Leech.
They are mostly marine organisms but a few live in fresh water.Head is distinct which consists of two pairs of eyes, palps and tentacles.Digestive system is complete and circulatory system is closed type.The sexes are separate and fertilization is external.They are widely distributed free-moving and segmented marine worms.The size of the worm ranges from 0.5 to 25 cm (0.2 to 10 inches).The back is somewhat arched with flattened pairs of overlapping scales.They have soft, finger-like projections and four horny jawsProstomium bears 1-5 antennae, 2 palpi and a caruncle.They have small oval body with median antenna on prostomium.Dorsal side bears membranous ridges while ventral setae are strongly curved.They are mostly marine but some are found in brackish waterThey are free moving organisms with a protrusible proboscis.They have an elongated, segmented body with a distinct head.The body is elongated with anteriorly broad and flat.Gills are present which arise dorsally from thoracic region.The mouth does not have jaws and the pharynx is partly eversible.Some of the anterior body segments bear paired gills.A pair of pits is present at the end of ciliated periostomium.Parapodia of mid region are long which are supported by aciculae.They have no prostomial appendages with no parapodial lobes.Setae are simple in size which arises directly from body wall.They are marine polychaete worms which are found worldwide.The head is conical or wedge-shaped that does not bear any antenna.They have unpaired branchial filament with peculiar feeding apparatus.Parapodia are biramous with weakly developed lobes.They are marine polychaetes with no prostomial appendages.The body is elongated with limited number of segments.They inhabit in muddy substrate, sand or between stones and shells.They are polychaete worms grow up to 20 cm or more.The body is elongated with no prostomial appendages.The body is red in color with no setae at 1 or 2 anterior segmentsThey are marine polychaetes that inhabit rocky and muddy bottoms.Prostomium and peristome are retractile, with 2 palpi.The body bears setae, of which anterior setae short and thick.They are marine polychate worms which live in tube made of sand.The body is divided into two parts: into thorax and abdomen.They are marine polychaete worms with no buccal organ.They have narrow tube-like body which is metamerically segmentedThey are hermaphroditic organisms (sexes are separate).The development is indirect with larval stages (trochophore larva).They have flattened, rounded shape body without external segmentation.The body is sack-like which does not contain external segmentation.The anterior end of the body bears circle of tentacles.They are pelagic dweller with two internal body septa.They are well-segmented aquatic and terrestrial worms.Development is direct which does not show any larval stage.Male gonopores, 1 or 2 pairs on segment posterior to testes.The male gonopores are located in segment immediately behind testes.Seminal receptacle is situated at or near segment containing testes.They are primarily live in freshwater, few in sea and other on moist land.They are haemocoelomate with open type of circulatory system.The body does not contain parapodia, tentacles,and setae.Gonads with gonoducts are present in some genital segments.They have complete alimentary canal with many crop and caeca.Fertilization is internal, development is direct with no larval stages.The head is modified as sucker with fingerlike projections.The posterior segments of the body is also modified to form sucker.They mainly live on parasitic or commensal life on freshwater crayfish.They are species of leech which feed on skin and blood of fishes.The body is segmented, of which five anterior segments bear setae.They are commonly known as freshwater leeches, jawless leeches etc.The head is narrowly rounded with open ventral sucker.They have relatively stout, slightly flattened body.The posterior end of the body is broader with tapering anterior end. These components prevent tumor expansion. ADVERTISEMENTS: In this article we will discuss about Leech:- 1. Connect with a tutor instantly and get your
They are coelomate and triploblastic. They also have series of ganglia, one per segment, that assist them in controlling their bodies.Earthworms are probably the best known and most common of the annelids; more than 2,700 kinds of earthworms have been identified around the world. have an incomplete digestive tract. (5 cm) long. The upper moves moves the blood forward, while the lower moves the blood back. They exist in various environments including marine waters, fresh waters and also in moist terrestrial areas. Furthermore some speciesfrom this phylum exhibit some unique shapes and brilliant colours. External Structures of Leech 3. Annelida definition, the phylum comprising the annelids. Earthworms also offer food for many birds such as robins, stroke, mammals like shrews, badgers, etc. For more information on Annelida, its characteristics, and classification, keep visiting BYJU’S Biology website or download BYJU’S app for further reference. In view of the coronavirus pandemic, we are making The earthworm, well-liked for creating healthy soil for our earth, is perhaps the most recognizable creature in this group. Locomotion 6. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. Our experts are available 24x7. The species exist in and have adapted to various ecologies – some in marine environments as distinct as tidal zones and hydrothermal vents, others in fresh water, and yet others in moist terrestrial environments.
And Annelids also live in moist terrestrial areas.
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