Editing Bryozoa (section)

=== Classification and diversity ===
Counts of formally described species range between 4,000 and 4,500.<ref>{{cite book |last=Chapman |first=A.D. |title=Numbers of Living Species in Australia and the World |publisher=Department of the Environment and Heritage, Australian Government |year=2006 |page=34 |isbn=978-0-642-56849-6 |url=http://www.environment.gov.au/biodiversity/abrs/publications/other/species-numbers/pubs/number-living-species-report.pdf |archive-url=https://ghostarchive.org/archive/20221009/http://www.environment.gov.au/biodiversity/abrs/publications/other/species-numbers/pubs/number-living-species-report.pdf |archive-date=2022-10-09 |url-status=live |access-date=2009-08-07}}</ref> The Gymnolaemata and especially Cheilostomata have the greatest numbers of species, possibly because of their wide range of specialist zooids.<ref name="Doherty2001EctoproctaInAnderson" /> Under the [[Linnaean taxonomy|Linnaean system of classification]], which is still used as a convenient way to label groups of organisms,<ref name="RuppertFoxBarnesCladistics">{{cite book | author1=Ruppert, E.E. | author2=Fox, R.S. | author3=Barnes, R.D. | name-list-style=amp | title=Invertebrate Zoology | chapter=Introduction to Invertebrates | publisher=Brooks / Cole | edition=7 | isbn=978-0-03-025982-1 | year=2004 | pages=[https://archive.org/details/isbn_9780030259821/page/2 2–9] | chapter-url=https://archive.org/details/isbn_9780030259821/page/2 }}</ref> living members of the [[phylum]] Bryozoa are divided into:<ref name="RuppertFoxBarnesBryozoa" /><ref name="Doherty2001EctoproctaInAnderson" />

{| class="wikitable"
! [[Class (biology)|Class]] !! [[Phylactolaemata]] !! [[Stenolaemata]] !! colspan="2" | [[Gymnolaemata]]
|- align="center"
! [[Order (biology)|Order]] !! [[Plumatellida]]<ref>{{cite web |url=https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=156688 |title=ITIS Standard Report Page: Phylactolaemata |publisher=Integrated Taxonomic Information System |access-date=2009-08-12 |archive-date=18 January 2018 |archive-url=https://web.archive.org/web/20180118182014/https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=156688 |url-status=live }}</ref>!! [[Cyclostomatida]] !! [[Ctenostomatida]] !! [[Cheilostomata]]
|- align="center"
! Environments
| [[Freshwater]] || Marine || colspan="2" | Mostly marine
|- align="center"
! Lip-like epistome overhanging mouth
| Yes || colspan="3" | none
|- align="center"
! Colony shapes
| Gelatinous masses or tubular branching structures<ref name="MassardGeimer2008FreshwaterBryoDiversity">{{cite journal |last1=Massard |first1=J.A. |year=2008 |title=Global diversity of bryozoans (Bryozoa or Ectoprocta) in freshwater |journal=[[Hydrobiologia]] |volume=595 |pages=93–99 |doi=10.1007/s10750-007-9007-3 |last2=Geimer |first2=Gaby |issue=1 |bibcode=2008HyBio.595...93M |s2cid=13057599}}</ref> || colspan="2" | Erect or encrusting<ref name="FishFish1996StudentsGuide" /> || Erect, encrusting or free-living
|- align="center"
! Exoskeleton material
| Gelatinous or membranous; unmineralized || Mineralized || [[Chitin]], gelatinous or membranous; unmineralized || Mineralized
|- align="center"
! Operculum ("lid")
| none || none<ref name="FishFish1996StudentsGuide">{{cite book |last=Fish |first=J.D. |author2=Fish, S. |title=A student's guide to the seashore |year=1996 |edition=2 |pages=[https://archive.org/details/studentsguideto00fish/page/418 418–419] |chapter=Bryozoa |isbn=978-0-521-46819-0 |publisher=Cambridge University Press |location=Cambridge |chapter-url=https://archive.org/details/studentsguideto00fish/page/418}}</ref> (except in family [[Eleidae]])<ref>{{cite journal |last1=Jablonski |first1=D. |last2=Lidgard |first2=S. |last3=Taylor |first3=P.D. |year=1997 |title=Comparative Ecology of Bryozoan Radiations: Origin of novelties in cyclostomes and Cheilostomes |journal=[[PALAIOS]] |volume=12 |pages=505–523 |doi=10.2307/3515408 |jstor=3515408 |issue=6 |bibcode=1997Palai..12..505J}}</ref> || None in most species || Yes (except in genus ''[[Bugula]]'')
|- align="center"
! Shape of lophophore
| U-shaped appearance{{pb}}(except in [[genus]] ''[[Fredericella]]'', whose lophophore is circular) || colspan="3" | Circular
|- align="center"
! How lophophore extended
| Compressing the whole body wall || Compressing the membranous sac{{pb}}(separate inner layer of [[epithelium]] that lines the coelom) || Compressing the whole body wall || Pulling inwards of a flexible section of body wall, or making an internal sac expand.
|- align="center"
! Types of zooid
| Autozooids only || Limited heterozooids, mainly gonozooids<ref name="HaywardRyland1985Cyclostome">{{cite book |last=Hayward |first=P.J. |author2=Ryland, J.S. |title=Cyclostome bryozoans |publisher=Linnean Society of London |year=1985 |page=7 |chapter=Key to the higher taxa of marine Bryozoa |isbn=978-90-04-07697-6 |chapter-url=https://books.google.com/books?id=cAsVAAAAIAAJ&q=Stenolaemata+Cyclostomata+heterozooid&pg=PA7 |access-date=2009-08-09 |archive-date=8 March 2023 |archive-url=https://web.archive.org/web/20230308183237/https://books.google.com/books?id=cAsVAAAAIAAJ&q=Stenolaemata+Cyclostomata+heterozooid&pg=PA7 |url-status=live }}</ref> || [[Stolon]]s and spines as well as autozooids<ref name="HaywardRyland1985Cyclostome" /> || Full range of types
|}