List of brachiopod genera
- Aalenirhynchia
- Aberia
- Aboriginella
- Abrekia
- Absenticosta
- Abyssorhynchia
- Abyssothyris
- Acambona
- Acanthalosia
- Acanthambonia
- Acanthatia
- Acanthobasiliola
- Acanthocosta
- Acanthocrania
- Acanthoglypha
- Acanthoplecta
- Acanthoproductus
- Acanthorhynchia
- Acanthorthis
- Acanthospirifer
- Acanthospirina
- Acanthothyris
- Acanthothyropsis
- Acanthotoechia
- Acareorthis
- Acculina
- Achunoproductus
- Acidotocarena
- Acolosia
- Acosarina
- Acritosia
- Acrobelesia (fossil per IRMNG)
- Acrobrochus
- Acrospirifer
- Acrothele
- Acrothyra
- Acrothyris
- Acrotreta
- Acrotretella
- Actinoconchus
- Actinomena
- Acuminothyris
- Acutatheca
- Acutella
- Acutilineolus
- Acutoria
- Adairia
- Adaptatrypa
- Adectorhynchus
- Adenus
- Adiaphragma
- Adminiculoria
- Admixtella
- Admodorugosus
- Adnatida
- Adolfia
- Adolfispirifer
- Adrenia
- Advenina
- Adygella
- Adygelloides
- Adygellopsis
- Aegiria
- Aegironites
- Aemula
- Aenigmastricklandia
- Aenigmastrophia
- Aenigmathyris
- Aequispiriferina
- Aerithyris
- Aerothyris
- Aesopomum
- Aetheia
- Aethirhynchia
- Afghanospirifer
- Afilasma
- Agarhyncha
- Agastapleura
- Agelesia
- Agerinella
- Agramatia
- Agulhasia
- Agyrekia
- Ahtiella
- Aidynkulirhynchia
- Airtonia
- Ajukuzella
- Akatchania
- Akelina
- Akopovorhynchia
- Aktassia
- Alabusherothyris
- Alaskospira
- Alatiformia
- Alatoproductus
- Alatorthotetina
- Aldaniopirifer
- Aldanotreta
- Aldingia
- Alekseevaella
- Alexenia
- Alichovia
- Aliconchidium
- Alimbella
- Alipunctifera
- Aliquantula
- Alisina
- Alispira
- Alispirifer
- Alispiriferella
- Alitaria
- Alithyris
- Allanella
- Allanetes
- Allorhynchoides
- Allorhynchus
- Almerarhynchia
- Almorhynchia
- Altaeorthis
- Altaestrophia
- Altaethyrella
- Altajella
- Altiplecus
- Altoplicatella
- Altunella
- Alvarezites
- Alwynia
- Ambardella
- Ambikella
- Ambocoelia
- Amboglossa
- Ambonorthella
- Ambothyris
- Amerista
- Amesopleura
- Ametoria
- Amictocracens
- Amissopecten
- Amoenirhynchia
- Amoenospirifer
- Amosina
- Amphiclina
- Amphiclinodonta
- Amphigenia
- Amphipella
- Amphiplecia
- Amphistrophia
- Amphistrophiella
- Amphithyris
- Amphitomella
- Amsdenella
- Amsdenina
- Amsdenostropiella
- Amurothyris
- Amydroptychus
- Amygdalocosta
- Anabaia
- Anabaria
- Anabolotreta
- Anadyrella
- Anakinetica
- Anaptychius
- Anarhynchia
- Anastrophia
- Anathyrella
- Anathyris
- Anatreta
- Anatrypa
- Anazyga
- Anchigonites
- Ancillotoechia
- Ancistrocrania
- Ancistrorhynchia
- Ancorellina
- Ancorhynchia
- Ancylostrophia
- Andalucinetes
- Andobolus
- Andreaspira
- Aneboconcha
- Anechophragma
- Anelotreta
- Anemonaria
- Angarella
- Angiospirifer
- Angulotreta
- Angusticardinia
- Angustothyris
- Aniabrochus
- Anidanthus
- Animonithyris
- Anisactinella
- Anisopleurella
- Annuloplatidia
- Anomactinella
- Anomalesia
- Anomaloglossa
- Anomaloria
- Anomalorthis
- Anoplia
- Anopliopsis
- Anoplotheca
- Anoptambonites
- Ansehia
- Antelocoelia
- Anteridocus
- Antezeilleria
- Anthracospirifer
- Antigonambonites
- Antigoniarcula
- Antinomia
- Antiptychina
- Antiquatonia
- Antirhynchonella
- Antispirifer
- Antistrix
- Antistrixia
- Antizygospira
- Antronaria
- Anulatrypa
- Anx
- Aorhynchia
- Aparimarhynchia
- Apatecosia
- Apatobolus
- Apatomorpha
- Apatorthis
- Apatoskenidioides
- Aperispirifer
- Apertirhynchella
- Aphanomena
- Aphaurosia
- Apheathyris
- Aphelesia
- Aphelotreta
- Apheoorthina
- Apheoorthis
- Aphragmus
- Apicilirella
- Apletosia
- Apodosia
- Apollonorthis
- Apomatella
- Apopentamerus
- Aporthophyla
- Aporthophylina
- Apothyris
- Apousiella
- Apringia
- Apsilingula
- Apsocalymma
- Apsotreta
- Arabatia
- Arabicella
- Araksalosia
- Araneatrypa
- Arapsopleurum
- Araspirifer
- Aratanea
- Aratella
- Aratoechia
- Araxathyris
- Araxilevis
- Arbizustrophia
- Arcelinithyris
- Arceythyris
- Archaeorthis
- Archaiosteges
- Archeochonetes
- Arcosarina
- Arcticalosia
- Arctireta
- Arctispira
- Arctochonetes
- Arctohedra
- Arctomeristina
- Arctosia (fossil per IRMNG)
- Arctothyris
- Arcualla
- Arcuatothyris
- Arcullina
- Ardiviscus
- Ardmosteges
- Arduspirifer
- Areella
- Arenaciarcula
- Arenorthis
- Areostrophia
- Argella
- Argentiproductus
- Argorhynx
- Argovithyris
- Argyrotheca
- Arionthia
- Arktikina
- Aromasithyris
- Articalosia
- Artimyctella
- Artiotreta
- Artospirifer
- Aseptagypa
- Aseptalium
- Aseptella
- Aseptirhynchia
- Aseptonetes
- Asiarhynchia
- Asioproductus
- Askepasma
- Asperlinus
- Aspidothyris
- Aspinosella
- Astaristrophia
- Astegosia
- Astraborthis
- Astua
- Asturorthis
- Astutorhyncha
- Asymmetrochonetes
- Asymphylotoechia
- Asyrinx
- Asyrinxia
- Atactosia
- Atelelasma
- Atelelasmoidea
- Atelestegastus
- Atelithyris
- Athabaschia
- Athyrhynchus
- Athyris
- Athyrisina
- Athyrisinoides
- Athyrisinopsis
- Athyrorhynchia
- Atlanticocoelia
- Atlantida
- Atribonium
- Atrypa
- Atryparia
- Atrypella
- Atrypellina
- Atrypina
- Atrypinella
- Atrypinopsis
- Atrypoidea
- Atrypopsis
- Atrypunculus
- Atrythyris
- Attenuatella
- Auchmerella
- Aucklandirhynchia
- Aulacatrypa
- Aulacella
- Aulacorphora
- Aulacothyris
- Aulacothyroides
- Aulacothyropsis
- Aulidospira
- Aulie
- Aulites
- Aulonotreta
- Auloprotonia
- Aulosteges
- Auricolispina
- Austinella
- Australiarcula
- Australina
- Australirhynchia
- Australispira
- Australocoelia
- Australosia
- Australospirifer
- Australostrophia
- Austriellula
- Austrirhynchia
- Austrochoristites
- Austrohedra
- Austronoplia
- Austrospirifer
- Austrothyris
- Avisyrinx
- Avonia
- Avonothyris
- Axiodeaneia
- Azamella
- Azygidium