Discinida

{{Short description|Order of brachiopods}}

{{Automatic taxobox

| fossil_range = {{Fossil range|Cambrian Stage 2|Recent|ref={{Cite web |url=http://palaeos.com/metazoa/brachiopoda/discinida.html |title=Discinida |url-status=live |accessdate=1 September 2016|archive-url=https://web.archive.org/web/20130306144312/http://palaeos.com:80/metazoa/brachiopoda/discinida.html |archive-date=2013-03-06 }}}}

| taxon = Discinida

| authority =

| subdivision_ranks = Superfamilies

| subdivision = {{collapsible taxon list

| Discinoidea | |{{nested taxon list

|Discinidae | |{{linked species list

|Discina|

|Discinisca|

|Discradisca |

|Pelagodiscus |

}}

| †Trematidae}}

| † Botsfordioidea| |...

|†Acrotheloidea | (?) |...

}}

}}

Discinida is an order of brachiopods comprising the extant superfamily Discinoidea, and the extinct superfamilies Botsfordioidea (early—mid-Cambrian) and Acrotheloidea (early Cambrian–Early Ordovician).{{cite book|last1=Ruppert|first1=E.E|author2=Fox, R.S.|author3=Barnes, R.D|title=Invertebrate Zoology|publisher=Brooks/Cole|edition=7|isbn=978-0-03-025982-1|year=2004|pages=[https://archive.org/details/isbn_9780030259821/page/821 821–829]|url-access=registration|url=https://archive.org/details/isbn_9780030259821/page/821}} It represents a sister taxon to the Lingulids, and is possibly paraphyletic with respect to the Acrotretoids.{{cite journal|doi=10.1098/rstb.1998.0350|title=Chemico-structural phylogeny of the discinoid brachiopod shell|journal=Philosophical Transactions of the Royal Society B: Biological Sciences|volume=353|issue=1378|pages=2005–2038|year=1998|last1=Williams|first1=A.|last2=Cusack|first2=M.|last3=Buckman|first3=J. O.|pmc=1692430}}{{check|date=October 2017}}—or the acrotretids are paraphyletic with respect to it.{{cite journal | url = http://rstb.royalsocietypublishing.org/content/royptb/337/1279/83.full.pdf| title = Structure of the organo-phosphatic shell of the brachiopod Discina| journal = Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences| date = 1992-07-29| bibcode = 1992RSPTB.337...83W| last1 = Williams| first1 = Alwyn| last2 = MacKay| first2 = Sarah| last3 = Cusack| first3 = Maggie| volume = 337| issue = 1279| page = 83| doi = 10.1098/rstb.1992.0086}}> The group displays a broad range of shell structures, some of which incorporate substantial organic or silicified components.