|
| |
| | Annelida on Encyclopedia.com |
 | | Because of the soft nature of the annelid body, fossils are not common. | | | The nervous system typically consists of a primitive brain, or ganglionic mass, located in the head region, connected by a ring of nerves to a ventral nerve cord that runs the length of the body; the cord gives rise to lateral nerves and ganglia in each segment. | | | Although a few aquatic forms have gills for respiration, most oligochaetes lack such specialized structures and use the capillaries of their body walls for respiratory exchange. |
|
http://www.encyclopedia.com/html/section/annelida_annelidcharacteristics.asp
(3373 words)
|
|
| |
| | Annelida |
| | Segments are formed sequentially in annelids and are established during development from growth zones located at the posterior end of the body; so the youngest segment in the body of an annelid is always the most posterior. | | | Annelid Resources: Another can of Worms: Phylum Annelida, polychaetes, oligochaetes, leeches, vent worms, etc. A guide to information on annelids, and current worm research and researchers. | | | The position of Brachiopoda is controversial (Lüter, 2000b; Lüter and Bartolomaeus, 1997; Stechmann and Schlegel, 1999) and the homology of their chaetae with those of annelids is unresolved (Lüter, 2000a). |
|
http://tolweb.org/tree?group=Annelida&contgroup=Bilateria
(2547 words)
|
|
| |
| | The Biology Of Annelids |
| | This technique shows many details of annelid functional biology: food being moved along the intestine by peristaltic contractions; the circulatory system including capillary beds where oxygen is picked up (worms breath through their skins); and excretory organs that act as miniature kidneys to remove urea. | | | Earthworms are classic subjects for studying annelid anatomy. | | | Featuring live photography of a diversity of annelid worms showing their behavior, structures and classification into three classes. |
|
http://ebiomedia.com/prod/BOanelids.html
(1307 words)
|
|
| |
| | Integrative and Comparative Biology: Unsegmented annelids? Possible origins of four lophotrochozoan worm taxa |
| | The name Siboglinidae refers to the primary description of frenulate pogonophorans as a family of annelids (Caullery, 1914; see McHugh, 1997 and Rouse and Fauchald, 1997) and is used here to emphasize their phylogenetic origins within annelids. | | | With advances in our understanding of annelid phylogeny, our perceptions of body plan evolution within the Metazoa are changing. | | | Whereas some authors advocate annelid affinities, others argue that these taxa do not fall within the annelid radiation. |
|
http://www.findarticles.com/p/articles/mi_qa4054/is_200206/ai_n9119129
(1203 words)
|
|
| |
| | Annelid - Wikipedia, the free encyclopedia |
| | A few small groups have been treated as separate phyla: the Pogonophora and Vestimentifera, now included in the family Siboglinidae, and the Echiura. | | | The posterior part of the body breaks off and forms a new individual. | | | These groups are united as the Trochozoa, and when the arthropods are included, they and the annelids are treated in a subgroup called the Articulata. |
|
http://en.wikipedia.org/wiki/Annelid
(976 words)
|
|
| |
| | Integrative and Comparative Biology: Annelid Endocrine Disruptors and a Survey of Invertebrate FMRFamide-Related ... |
| | More studies are needed to determine the mechanisms that underlie these responses. | | | One family of peptides related to the molluscan peptide FMRFamide has been found in almost all invertebrates examined including annelids. | | | Most studies have examined the uptake, accumulation, and toxicity of these materials in annelids; however, there are some studies that have examined the physiological impacts of these substances on the animals. |
|
http://www.findarticles.com/p/articles/mi_qa4054/is_200502/ai_n13640090
(1286 words)
|
|
| |
| | Annelid Introduction 1 |
| | The nervous system of annelids consists of a double ventral nerve cord, a pair of ganglia in each metamere along with lateral nerves and a bilobed "brain" consisting of a pair of dorsal, cerebral ganglia. | | | Gas exchange in annelids occurs through the skin, gills or lateral appendages called parapodia. | | | Excretion occurs via paired nephridia that are found in most body segments. |
|
http://bioweb.uwlax.edu/zoolab/Table_of_Contents/Lab-6a/Annelid_Introduction_1/annelid_introduction_1.htm
(151 words)
|
|
| |
| | Creature Catalog - Preview Creature |
| | Their bodies, grayish-brown in color, are segmented like earthworms. | | | Exposure to light does not damage them, but they dislike it. | | | This returns it to the annelid’s maw, where another successful grapple check is needed to get free. |
|
http://www.enworld.org/cc/converted/view_c.php?CreatureID=496
(653 words)
|
|
| |
| | annelid |
| | Annelids are noted for their ability to regenerate missing parts of their bodies. | | | They have a distinct head and soft body, which is divided into a number of similar segments shut off from one another internally by membranous partitions, but there are no jointed appendages. | | | Annelids include earthworms, leeches, and marine worms such as lugworms. |
|
http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0019261.html
(168 words)
|
|
| |
| | CyberEd® PLATO Science :: Science Education Software |
| | Annelids' interactive overview of the three largest annelid classes teaches students the importance of oligochaetes, the different body plans of polychaetes, and the actual medical uses of leeches. | | | Animal characteristics - the importance of annelid segments, symmetry and development in classifying annelids - annelid evolution - annelid anatomy and organ systems involved with the integument, support, movement, digestion, excretion, circulatoin, respiration, and sensation - diversity, feeding and reproduction in the three largest annelid classes - Oligochaeta - Polychaeta - Hirudinea. | | | Nervous Response is an Annelid's Chief Form of Defense |
|
http://www.cybered.net/commerce.asp?CatId=252&ProdId=X0993000
(273 words)
|
|
| |
| | annelid - definition of annelid by the Free Online Dictionary, Thesaurus and Encyclopedia. |
| | annelid - worms with cylindrical bodies segmented both internally and externally | | | This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. | | | Any of various worms or wormlike animals of the phylum Annelida, characterized by an elongated, cylindrical, segmented body and including the earthworm and leech. |
|
http://www.thefreedictionary.com/annelid
(243 words)
|
|
| |
| | Arthropods and Annelid Worms |
| | Finally, species not presently on any Federal or state lists were included if it was felt that they might be significantly affected in a negative way by changes in forest management practices due to any of the alternatives being considered by this impact statement. | | | The Fish and Wildlife Service has carried out only cursory assessments of the Annelida and Arthropoda within the range of the northern spotted owl (FEMAT, 1993), while the states within the range of the owl have not carried out any assessments of native arthropods or annelids within the habitats occupied by the northern spotted owl. | | | Narrative on arthropods and annelid worms of old-growth and late successional conifer forests, mature riparian woods, and of coarse woody debris associated arthropods within the range of the northern spotted owl ( |
|
http://www.fort.usgs.gov/resources/education/arthropods/arthropods_annelids.asp
(1107 words)
|
|
| |
| | The Flashback Annelid |
| | They're sanitary, sit in neat little rows in our fly boxes, and have fancy names like "pink annelid," or "San Juan Worm," or some such. | | | If another fly fisherman happens to ask what I'm using, I'll just tell him it's a "flashback annelid." I may or may not wink when I tell him. | | | They fool fish, maybe as well as the real thing, but they lack the smell of the forest, fallen leaves, damp moss, and the heady aroma of spring. |
|
http://www.smallstreams.com/archives/DennisSmith.html
(466 words)
|
|
| |
| | INHS Annelid Collection Aquatic Annelida of IL |
| | Rapidly evolving lineages impede the resolution of phylogenetic relationships among Clitellata (Annelida). | | | Common and scientific names of aphanoneuran and clitellate annelids of the United States and Canada. | | | The section in that book discussing the phylogeny and classification of aquatic oligochaetes set the stage for numerous investigations into the phylogenetic relationships of all annelids. |
|
http://www.inhs.uiuc.edu/cbd/collections/annelid/aquaticannelid.html
(1810 words)
|
|
| |
| | The Annelids (Phylum Annelida) |
| | Annelids are coelomate animals meaning they have a true coelom within their body. | | | Annelids are coelomate animals (meaning they have a true coelom, even if this is reduced secondarily). | | | In many countries people are still familiar with Medicinal leeches, and people who live closer to nature are naturally more familiar with a much wider range of Annelids than those who live in cities. |
|
http://www.earthlife.net/inverts/annelida.html
(1739 words)
|
|
| |
| | MSN Encarta - Annelid |
| | Fossil annelids are rare because their soft bodies do not preserve well. | | | Although annelids are diverse in form, the bristle worms, which generally are considered the ancestral stock, can exemplify their structure. | | | Some aberrant marine annelids are often placed in separate classes; others may even be in separate phyla. |
|
http://encarta.msn.com/encyclopedia_761560164/Annelid.html
(479 words)
|
|
| |
| | Search Results for annelid - Encyclopædia Britannica |
| | The word nephridium applies in its strict sense only to the excretory organs of annelids, but it may usefully be extended to include the excretory organs of other phyla having similar... | | | Annelids have a well-developed body cavity (coelom), a part of the lining of which gives rise to gonads. | | | In some annelids, gonads occur in several successive body segments. |
|
http://www.britannica.com/search?query=annelid&submit=Find&source=MWTEXT
(392 words)
|
|
| |
| | Introduction to the Annelida |
| | Annelids can be told by their segmented bodies. | | | Polychaetes (meaning "many bristles") have, predictably, many bristles on the body, while earthworms and leeches have fewer bristles. | | | There are about 9000 species of annelid known today. |
|
http://www.ucmp.berkeley.edu/annelida/annelida.html
(164 words)
|
|
| |
| | annelida |
| | *polychaetes, as the most primitive annelids, are used as examples | | | Fig 13a A phylogeny of Bilateria showing the relationships of Protostomia. | | | Fig 75 The layers of the annelid body wall. |
|
http://www.lander.edu/rsfox/310annelid1Lec.html
(2521 words)
|
|
| |
| | Annelid Introduction 2 |
| | In annelids, the separation of the coelom by transverse septa means that the forces of muscular contraction are not transferred through the organism. | | | With a repetition of body parts, the possibility also arises for specialization of these body parts into different structures (serial homology); this potential is not realized so much in annelids but will become important in arthropods! | | | In locomotion, metamerism provides a more effective system for body movement; the body is divided into a consecutive series of motor units that can be controlled separately or in a wave of contraction. |
|
http://bioweb.uwlax.edu/zoolab/Table_of_Contents/Lab-6a/Annelid_Introduction_2/annelid_introduction_2.htm
(187 words)
|
|
| |
| | Illinois Natural History Survey |
| | Most annelids are free-living, but many species are parasitic, mutualistic, or commensal during part of, or throughout, their life cycle. | | | Worms are an important and often dominant group in aquatic systems, providing a valuable food source for many other aquatic organisms; 131 species presently are known to occur in Illinois. | | | Currently, none of the annelids known or thought likely to occur in Illinois is listed as endangered or threatened by either the federal government or by the State of Illinois, nor are there any under consideration for such listing. |
|
http://www.inhs.uiuc.edu/cbd/collections/annelid/annelidintro.html
(379 words)
|
|
| |
| | Worms |
| | It holds two pairs of eyes, three antennea, a pair of palps, pairs of tentacular cirri for testing the environment and sometimes an eversible proboscis or pharynx. | | | Many marine worms belong to the segmented Annelids, which include the Oligochaetes such as the terrestrial earthworms, the marine Polychaetes such as Eunice aphroditois, and freshwater preferring Hirudinae such as the leeches. | | | At the front or anterior end of an Annelid worm is a well developed head which is called a prostomium. |
|
http://www.mesa.edu.au/friends/seashores/worms.html
(547 words)
|
|
| |
| | WormNet Symposium |
| | Furthermore, because annelids are one of the most evolutionarily successful “phyla” and because they diversified in the late PreCambrian to early Cambrian, understanding their early evolutionary history is paramount to understanding the evolution of animal life. | | | Recent evidence suggests that several non-segmented or partially segmented worm taxa, that were previously regarded as separate phyla, are within the annelid radiation. | | | This symposium includes speakers that will address annelid phylogeny and evolutionary mechanisms of segmentation in order to review the recent advances in the field and explore areas that need to be addressed. |
|
http://www.auburn.edu/academic/science_math/biology/faculty/halanych/WormNet
(250 words)
|
|
| |
| | Polychaete Annelid Identification, or “You Can Always Tell A Bristle Worm
by Ronald L. Shimek, Ph.D. - ... |
| | While I would truly like to say that these characters, and character sets, are consistently and logically used, I can't. | | | The family names all end in the same four letters, "-idae." As examples, all of the fireworm species are placed in the Family Amphinomidae, and are commonly referred to as "amphinomids," while marine blood worms are placed in the Family Glyceridae and are referred to as "glycerids." | | | This group of animals is diverse, with over 10,000 species known, and undoubtedly many thousands of species are remaining to be discovered and scientifically described. |
|
http://www.reefkeeping.com/issues/2003-03/rs/index.php
(2769 words)
|
|
| |
| | Annelid Taxa |
| | Class Hirudinea- are believed to have evolved from oligochaetes. | | | Zygotes develop into a type of larva called a trochophore, which subsequently grows into a worm by adding segments at the posterior end (this is not what cestodes do). | | | Class Polychaeta- over half of the annelids are in this group of mostly marine forms. |
|
http://tidepool.st.usm.edu/Crswr/annelidclasses.html
(188 words)
|
|
| |
| | Nicholas Nethercote: Software |
| | This would increase the range of errors that Annelid can detect that Memcheck cannot. | | | It also can't detect static or stack variable overruns. | | | Also, because Annelid tracks pointers, it can also find some type errors, such as if you add or multiply two heap pointers. |
|
http://www.cs.utexas.edu/~njn/software.html
(717 words)
|
|
| |
| | My Family Tree - Phylum Annelid |
| | The bodies of annelids are long and rounded with bristles or hairs. | | | There are about 9,000 different worm-like animals that call themselves annelids. | | | A phylum is a smaller group than kingdom but bigger than the next division called a class. |
|
http://www.urbanext.uiuc.edu/worms/familytree/phylum.html
(82 words)
|
|
| |
| | Analog Annelid |
| | Analog Annelid is a remake of the ubiquitous "Snake" and "Worm" games in which the player controls the movement of such a creature in an attempt to collect apples, numbers, or whatever. | | | This is for the sake of easier programming both in the game itself and in the display of graphics. | | | Why don't you take a look at some Screen Shots... |
|
http://www.garthgillespie.com/annelid
(177 words)
|
|
| |
| | Invert Zool Lab Refs |
| | ~ Here are links to other sites with further taxonomic information about annelid groups, or alternate hierachies of those groups. | | | The class is divided into 25 orders and 87 families. |
|
http://www.anselm.edu/homepage/chieber/izlabref7b.html
(156 words)
|
|
| |
| | Annelid |
| | Reproductive Strategies and Developmental Patterns in Annelids (DEVELOPMENTS IN HYDROBIOLOGY Volume 142) (Developments in Hydrobiology) | | | Environmental variables and intertidal beach annelids of Sao Sebastiao Channel (State of Sao Paulo, Brazil). | | | Catalogue of the polychaetous annelids of the world (Allan Hancock Foundation publications. |
|
http://www.veryhappening.com/things/annelid
(122 words)
|
|
| |
| | Ask the Answer Worm! |
| | Even their teachers can’t wiggle their way out of this one! | | | And it's my job to make you and everybody else naturally resourceful about natural resources. | | | The S.K. stands for "Scientific Knowledge." But you can call me Skworm, as in squirm around and wiggle all over the place. |
|
http://www.nrcs.usda.gov/feature/education/squirm/skworm.html
(107 words)
|
|
| |
| | ANNELIDS |
| | This page is concerned with the invertebrate group Annelida. | | | The page has been split into the three classes of Annelids for clarity, as well as containing links that pertain to the Annelids in general. |
|
http://www.bio.hw.ac.uk/marine/DIR/ann.HTM
(59 words)
|
|
| |
| | Benthic Annelid Ecology |
| | Our lab has been studying population dynamics, migration and other factors affecting worm abundance on intermediate scales. | | | For more information on this subject, visit the Levinton Lab Webpage | | | Perinais is a benthic annelid in a very diverse salt marsh community. |
|
http://life.bio.sunysb.edu/~jmatth/science/worms.htm
(89 words)
|
|
| |
| | annelid - OneLook Dictionary Search |
| | annelid : Dorland's Illustrated Medical Dictionary [home, info] | | | We found 22 dictionaries with English definitions that include the word annelid: | | | annelid : Hutchinson's Dictionary of Difficult Words [home, info] |
|
http://www.onelook.com/?w=annelid&ls=a
(214 words)
|
|
| |
| | Branchiobdellida Annelid Parasitism of Crayfish |
| | Bower, S.M., McGladdery, S.E. Synopsis of Infectious Diseases and Parasites of Commercially Exploited Shellfish: Branchiobdellida Annelid Parasitism of Crayfish. | | | Branchiobdella hexodonta, Branchiobdella parasitica, Cambarincola chirocephala, Pterodrilus distichus and possibly Branchiobdella astaci and other species of this order (Branchiobdellida) of clitellate annelids (intermediate between oligochaetes and leeches). |
|
http://www.pac.dfo-mpo.gc.ca/sci/shelldis/pages/branapcy_e.htm
(304 words)
|
|
| |
| | Allwords.com Definition of annelid |
| | Any member of a phylum of invertebrate animals that characteristically have long soft cylindrical bodies composed of many similar ring-shaped segments, eg the earthworm or the leech. | | | Your Query of 'annelid' Resulted in 1 Matches |
|
http://www.allwords.com/word-annelid.html
(69 words)
|
|
| |
| | Annelid Worms |
| | What kind of circulatory system does an annelid worms have? | | | Why is an annelid worm called a segmented worm? | | | Read page 390 in your textbook and complete the following. |
|
http://sps.k12.mo.us/pipkin/tzeigler/Science/AnnelidWorms.htm
(39 words)
|
|
| |
| | annelid : Definition |
| | Search for annelid in these other databases too |
|
http://www.biology-text.com/definition.php?word=annelid
(19 words)
|
|
| |
| | reefED - GBR Explorer - Annelid Worms |
| | They belong to the phylum Annelida, a Latin word meaning 'little ring.' Annelids also belong to the Class Polychaeta, from the Greek word meaning 'many long hairs.' | | | Marine annelid worms vary a great deal from the garden varieties with which we are familiar. | | | GBR Explorer Overview » Animals &; Marine Invertebrates » Annelid Worms |
|
http://www.reefed.edu.au/explorer/animals/marine_invertebrates/annelid_worms
(169 words)
|
|
|
