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Characteristic of metazoa is the process of embryonic development by which the fertilized egg passes through a series of changes culminating in the formation of the adult. This includes all the animal phyla except the sponges, Trichoplax, and certain parasites. In older texts, Metazoa is often taken to be synonymous with our
Animalia, excluding only the protozoa. It may be formalized as a subkingdom, but its treatment varies considerably. Metazoa are distinguished from other Animalia in that they can perform apoptosis. This is a biological recognition that cell differentation is essential to these organisms.
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copied out of a book that discussed them in a single article. For instance, the protostome article talks as much about deuterostomes as protostomes. That was the whole reason I wanted to merge in the first place. The two subjects complement each other well enough to be in the same article and I couldn't decide what a combined article should be named. I've started new subject to discuss this idea.
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and are much better representations of the current understanding of phylogeny than are other encyclopedias. These sites are good secondary sources, while encyclopias are tertiary sources. I think these two sites are a good guide as to which clades should have there own articles. With a little reasearch, all of the clades can be made into adequate articlea that stand on their own. --
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not broad agreement on classification, and we certainly owe it to the readers to indicate that there are differences among authorities, and that the whole classification scheme is changing as more information becomes available and is reinterpreted. I also fail to see why the way
Wikispecies presents information should constrain how Knowledge does so. --
522:"Ther is a lot to say..." Then please expand the current stubs. I agree that there's a lot of info for those articles, but I don't have it to add. If a section, deuterostomes for example, becomes large later on, we can split it out later. Right now, it does nobody any good to have tiny bits of information scattered about.
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The article says "Most other classification schemes do not include a subkingdom
Eumetazoa. Cladistic systems do not recognize Eumetazoa because it does not form a monophyletic clade." Whether or not they consider it a subkingdom, many recent papers and classifications refer to the clade Eumetazoa as
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Since above-phylum-level taxonomy is currently in a period of flux, it's important not to "take a view" ourselves but to present the alternatives. In particular, we shouldn't start merging articles even if it looks like certain taxa are not clades. First, we may be wrong. Second, many names continue
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The groups complement each other, but they are separate clades, with separate characteristics and subgroups. The protostome article doesn't talk about modern deuterostomes, although it does have a lot of discussion about how deuterostomy was the ancestral condition. This could use a reference, and
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If we don't merge (as I see I'm in the minority), can we leave the stub article here with a link to animal, protostome, and deuterostome instead of blindly redirecting to animal? Additionaly, I'd like to re-write the articles on protostome and deuterostome. The articles currently look like they were
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classify
Deuterostomia as one of some ten clades that make up Bilateria. In these classifications, there is no Protostomia, and the protostomes are simply all the clades in Bilateria that are not part of Deuterostomia. Both of these sites have copious references, are written by experts in the field,
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Allow me to clarify. Eumetazoa is a subregnum (subgroup) of regnum
Animilia (Metazoa). Animilia includes Eumetazoa. Eumetazoa includes the following superphyla: Radiata, Bilateria: Protostomia (protostomes), and Bilateria: Deuterostomia (deuterostomes). Eumetazoa used to link to animal. This implies
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As luck would have it I've stayed away for a week and saved myself from getting in the middle of this. I'd like to say that I agree with the ideas of not trying to describe the taxonomic tree - as a human construct its in flux, and will continue to be until the human race gets comfortable with not
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I see no references for that page in
Wikispecies. That certainly makes it a poor candidate as a source for Knowledge. The clade diagram on the page differs in details from the sources I look at, but that is not necessarily a major concern. Tolweb often gives alternative clade diagrams when there is
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I think the proposed mergers would be a bad idea. One, I don't understand what the benefit would be. Two, redirecting clade A to clade B will just create confusion -- non-experts will wonder why they ended up at B when they looked for A, and once the reader figures out the reason for the surprising
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to
Eumetazoa, why doesn't it make sense to redirect Eumetazoa to animal? The two groups are not identical, but they are close, whereas groups like deuterostomes are very different in composition. There is a lot to say about each superphylum on their own, and they are used in most classifications,
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It's really not up to us to "organize the tree". There is no single tree: each piece of research results in a different tree. We don't have the expertise to judge between the alternatives: all we can do is present them. For the taxoboxes we try to pick an authoritative and well-respected published
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Deuterostomia is a major taxon. On the other hand, protostomes may not be a taxon, as such, but simply a collection of
Bilaterian taxa that are not deuterostomes, just as invertebrates are not a taxon, but a collection of all animals that are not vertebrates. As a taxon, or clade, Deuterostomia
662:. These are very important clades of animals, and I think it would be harmful to merge them into eumetazoa. There is nothing wrong with short articles. These are not sub-stubs. It would be better to work on expanding these articles. I think every important clade should have it's own article. --
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Metazoa usually refers to the animals with numerous cells which are arranged in layers or groups resulting in the formation of organs, fully differentiated tissues, including nerves and muscles. Different cells here can follow different lines of specialization to perform various functions.
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into one article on fruit? Yes, protostomes and deutereostomes are complete opposites, but since all we have in their articles is a definition (and WP is not a dictionary) and a discussion of their common evolution, why not group the information into one article at the next higher level.
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A wikipedian confused the terms
Metazoa and Eumetazoa, and created a page for Metazoa describing the taxon Eumetazoa. Here is the information that was found on that page, if there is anything here that is not currently on this page, by all means use it.
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part of the
Subkingdom Eumetazoa. It is actually part of the Subkingdom Parazoa alongside the Phylum Porifera (true sponges). Members of the Phylum Placozoa are not sponges, in other words, but they do share a Subkingdom with sponges, not with us.
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being able to fit everything into little boxes. I think its most important for each of these taxons to describe the criteria for belonging to the taxon and listing the subtaxa generally accepted, and those disputed, as subordinates.
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that Knowledge has no information on Eumetazoa, which is not true. Either the page for Eumetazoa should be a disabig page (frown) or Eumetazoa can include information on it's member groups with a link to animal (it's parent group).
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are commonly used, whereas I've seen systems that don't use Eumetazoa. Whatever you were planning to leave behind after the merger - if not redirects, an explanatory note or something - I still think would be more appropriate on
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shows a clade uniting Bilateria, Cnidaria, & Placozoa nested within a larger clade that includes Ctenophora. This later clade too is unlabeled, but it clearly represents Eumetazoa, since it excludes the (again paraphyletic)
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Thanks for the feedback. You're right that those characters can't define a clade, but they can be synapomorphies that diagnose a clade. Presumably tissues and a gastrula stage were characters of the last common ancestor of all
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is not completely correct. It would make more sense to collect the stub articles on the superphyla in Eumetazoa. This would clarify (disambiguate) the information without forcing the user to go to wikispecies to puzzle it out.
1240:, there is no label on the cladogram for Gnathostomata. However, the groups from Placodermi clockwise to Tetrapoda clearly constitute a clade in this cladogram, and the gnathostomes are even mentioned in the text below.
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I was going to redirect them here and put their content here after a rewrite and polishing. However, I think it's obvious that a large group of wikepedians feel this shouldn't happen. No problem. It
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comprising those animals (metazoans) that have tissues and a gastrula stage of development. This excludes sponges but includes Cnidarians and Bilaterians. More obscure groups such as mesozoans and
513:"...redirect clade A to clade B..." and people will wonder, "why did I get directed here?" This page used to do exactly that, by redirecting to animal. This is exactly what I wish to correct.
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One of the characteristics is given as having a gastrula stage, the gastrula page specifies that this is a triploblast structure, but not all Eumatazoa (such as Cnidaria) are triploblasts.
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The problem is that the clade Deuterostomia and the clades known collectively as Protostomia are a fundamental division, like Vertebrate and Invertebrate. I would compare merging
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Peterson, Kevin J., and Nicholas J. Butterfield. 2005. Origin of the Eumetazoa: Testing ecological predictions of molecular clocks against the Proterozoic fossil record.
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Thank you. That removed any lingering doubt I had about removing the merge tags. Your explanation is so logical, I'm only left with one thing to say, "I stand corrected." --
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Now I have to find time to work on these articles. I should wait a little bit, anyway, to see what other opinions are around on how to organize the 'tree'. --
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High-level classification is variable. The version wikispecies uses isn't necessarily wrong, but it isn't necessarily standard and it isn't the whole story.
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I removed the mention of organs formed by germ layers, because as I understand it, only those animals with three germ layers (triploblasts) have true organs.
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article could be expanded to include the history of use of the term, which has shifted as the relationships of phyla have been better understood. If
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531:"Why...doesn't it make sense to redirect..." I'm not proposing redirects, I'm proposing a merger of stub articles into a coherent parent article.
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for that reason; someone that wants a definition of Eumetazoa and types it into Knowledge will get the false impression that Eumetazoa=animalia.
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If you have the sources, change the article and cite the sources. I haven't found anything that explicitly says Eumetazoa isn't a clade. --
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Here's another example of a university website that does explicitly mention Eumetazoa as a clade, and even lists a few synapomorphies: <
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It would be a mistake to assume that a node isn't a clade just because it isn't labeled. For example, further down the hierarchy, under
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When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
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are Eumetazoans." and then describe what the Radiata and Bilateria have in common. I think it's okay if this article is short.
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article. I think it is just a matter of some time and effort to build up all of these articles to well beyond stub status. --
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Going back to the primary literature, we can find several papers that refer to Eumetazoa as a clade. Here are two of them:
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has a polytomy that clearly constitutes a clade that excludes a (paraphyletic) Porifera. Likewise, the cladogram on
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redirect, he/she still has to hunt for the relevant information in an article that's mainly about something else. --
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1142:. And third, the article gives us a place to record the history of the taxon and its study. So no merges, please.
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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
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Okay, I was basing my opinion on the info at Wikispecies (see link on article page). Is that info correct?
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depict eumetazoans as a clade within their trees; they just don't label that node. The cladogram on the
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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with
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a group of organisms consisting of a single common ancestor and all the descendants of that ancestor.
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https://web.archive.org/web/20090321190209/http://kentsimmons.uwinnipeg.ca/16cm05/1116/16anim2.htm
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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before doing mass systematic removals. This message is updated dynamically through the template
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are Eumetazoans," I think that would be okay, in terms of not confusing the reader too much.
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As long as the opening line of a combined article had all the relevant terms in bold, i.e. "
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576:(which may be out of date or whatever), this group includes all animals except sponges and
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I'm not sure how to do it, but someone could add a link to the chinese article on this.
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The best solution is probably not to merge, though. I think this article should read "
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If you found an error with any archives or the URLs themselves, you can fix them with
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for more background discussion relating to this idea. Any comments on this option?
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those animals (metazoans) that have tissues and a gastrula stage of development
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to be widely used even though known to be paraphyletic or polyphyletic, e.g.
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http://www.biology.ualberta.ca/courses.hp/zool250/Clades/clade02-Metazoa.htm
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and the University of California, Berkely Museum of Paleontolgy web site
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whereas Eumetazoa isn't. I think the proposed moves are very bad ideas.
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OK; I'll pull together a few more sources and make the change shortly.
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should have it's own article. I see the hierarchy of articles as:
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I'm going to go a bit further: both the Tree of Life Web Project
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are more problematic, but either fit into that clade or don't.
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makes it a 'grade', not a 'clade'. A clade is by definition
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Possibly just protostome could be merged into deuterostome.
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for additional information. I made the following changes:
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University of California, Berkeley Museum of Paleontology
876:"to merging vertebrate and invertebrate..." or grouping
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http://kentsimmons.uwinnipeg.ca/16cm05/1116/16anim2.htm
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does not include Eumetazoa in its cladograms, and the
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Actually, both the UCMP and the Tree of Life project
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1467:using the archive tool instructions below. Editors
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Proceedings of the National Academy of Sciences USA
1201:also does not use Eumetazoa in its cladograms. --
985:Last I checked, protostomes where monophyletic.
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1453:This message was posted before February 2018.
618:is a subkingdom of Animals that includes the
591:is a subkingdom of Animals that includes the
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1423:I have just modified one external link on
1037:is merged into anything, it should be the
234:into articles about endangered species.
1266:Molecular Phylogenetics & Evolution
308:into articles about endangered species.
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418:Knowledge:WikiProject Tree of Life
330:Science collaboration of the month
114:. For more information, visit the
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1560:WikiProject Tree of Life articles
1555:Mid-importance taxonomic articles
1427:. Please take a moment to review
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479:If it makes sense to redirect
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1332:Characteristics of Eumetazoa
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1403:The Mysterious El Willstro
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1369:Metazoa redirect to Animal
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1217:eumetazoans.
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1027:Deuterostome
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987:— Preceding
954:Deuterostome
883:TheLimbicOne
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861:Invertebrate
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116:project page
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40:WikiProjects
1154:Mattopaedia
1118:synthesis.
1025:except for
855:to merging
853:Protostomes
746:Protostomia
656:protostomes
266:Sphaeriidae
30:Start-class
1529:Categories
1516:Report bug
1338:Cephal-odd
1317:Cephal-odd
1275:Cephal-odd
1173:Cephal-odd
1169:Trichoplax
1035:Protostome
1031:Protostome
1019:Protostome
924:at the top
857:Vertebrate
481:protostome
213:Open Tasks
1499:this tool
1492:this tool
1425:Eumetazoa
1233:Porifera.
1039:Bilateria
1023:Bilateria
966:Bilateria
958:Ecdysozoa
949:Eumetazoa
945:Bilateria
932:Eumetazoa
833:Bilateria
755:Eumetazoa
660:eumetazoa
632:mezozoans
624:Bilateria
616:Eumetazoa
609:mezozoans
600:Bilateria
589:Eumetazoa
97:Eumetazoa
1505:Cheers.—
1273:Cheers,
1128:reptiles
1124:protists
989:unsigned
401:and the
399:taxonomy
280:Mammals:
273:Requests
252:Omnivore
222:Copyedit
1429:my edit
1099:Dalbury
1045:Dalbury
941:Radiata
936:Animals
928:Sponges
922:Animals
867:Dalbury
809:mergers
742:Radiata
724:Dalbury
686:Dalbury
666:Dalbury
628:sponges
620:Radiata
605:sponges
594:Radiata
578:Mezozoa
461:Mergers
442:on the
293:Fishes:
239:Improve
179:history
148:on the
121:Animals
112:zoology
108:animals
59:Animals
1262:et al.
1193:. The
1140:sharks
1029:. The
947:under
934:under
837:animal
639:(talk)
582:Animal
467:animal
313:Expand
303:Merge:
229:Merge:
36:scale.
1356:Cjeam
1247:: -->
1191:Clade
1189:(see
1132:algae
863:. --
859:into
851:into
658:into
189:purge
184:watch
163:To-do
1407:talk
1360:talk
1136:fish
1070:talk
997:talk
943:and
930:and
888:talk
841:Josh
818:talk
798:talk
775:talk
759:Josh
748:and
710:talk
654:and
636:Dave
630:and
622:and
607:and
597:and
555:talk
546:Josh
544:and
486:Josh
174:edit
110:and
1473:RfC
1443:to
1398:not
1144:Gdr
835:or
542:Chl
493:Chl
434:Mid
268:),
140:Top
1531::
1486:.
1481:}}
1477:{{
1409:)
1362:)
1222:do
1138:,
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881:--
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42::
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