# Acrothyra
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{{Short description|Extinct genus of brachiopods}}
{{Automatic taxobox
| fossil_range = Miaolingian – ~{{Fossil range|{{period start|Middle Cambrian}}}}
| taxon = Acrothyra
| authority = Matthew, 1901
| type_species = Acrotreta proavia
| type_species_authority = Matthew, 1899
}}
'''''Acrothyra''''' is an [extinct](/source/Extinction) genus of gregarious [brachiopod](/source/brachiopod) that lived during the Middle [Cambrian](/source/Cambrian). Fossils of this genera can be found in [Canada](/source/Canada) in [formations](/source/Geological_formation) such as the [Burgess Shale](/source/Burgess_Shale) and the [Forteau Formation](/source/Forteau_Formation).[{{cite journal|last1=Caron |first1=Jean-Bernard|last2=Jackson |first2=Donald A.|title=Taphonomy of the Greater Phyllopod Bed community, Burgess Shale|journal=PALAIOS |volume=21 |issue=5 |pages=451–65|date=October 2006|doi=10.2110/palo.2003.P05-070R|jstor=20173022|bibcode=2006Palai..21..451C |s2cid=53646959 }}]
== Taxonomy ==
=== Species ===
This genus currently contains five described species. They are listed below:[https://www.gbif.org/species/search?rank=SPECIES&highertaxon_key=4864454&status=ACCEPTED&status=DOUBTFUL]
#''Acrothyra bonnia Skovsted, Knight, Balthasar & Boyce, 2017''[Skovsted, Christian & Knight, I & Balthasar, Uwe & Boyce, DW. (2017). Depth related brachiopod faunas from the lower Cambrian Forteau Formation of southern Labrador and western Newfoundland, Canada. Palaeontologia Electronica. 54A. 10.26879/775. ]
#''Acrothyra gregaria'' Walcott, 1901
#''Acrothyra minor'' Walcott, 1905 [{{Cite web |title=Inarticulate Brachiopods of the Lower and Middle Cambrian Pioche Shale of the Pioche District, Nevada |url=http://https//biodiversity.ku.edu[current-page] |access-date=2026-05-13 |website=https |language=en}}]
#''Acrotreta proavia'' (Matthew, 1899) ([Type species](/source/Type_species))
#''Acrothyra sera'' Mathew, 1902 [Landing, Ed & Johnson, Susan & Geyer, Gerd. (2008). Faunas and Cambrian Volcanism on the Avalonian Marginal Platform, Southern New Brunswick. Journal of Paleontology. 82. 884-905. 10.1666/07-007.1.]
== Description ==
Members of this genus have short apsacline ventral pseudointerarea with a triangular intertrough. The interior of the ventral valve is elongated with its apical process reaching about one-third of its valve length. It also has a triangular depression without apical pits.