小嘴贝目
下级分类

本目包括以下科：
Acanthothirididae
Allorhynchidae
Amphidellidae
Amphipellidae
Ancistorhynchidae
Ancistrorhynchidae
Antistrixidae
Apodosiidae
Araratellidae
Aratellidae
Aseptorhynchiidae
Astraeleniidae
Atriboniidae
Austrirhynchidae
Austrirhynchiidae
Basiliolidae
Camarotoechiidae
Camerophorinidae
Cardiarinidae
Cardinirhynchiidae
Chaniellidae
Cryptoporidae
Cryptoporiidae
Cyclothyridae
旋孔贝科 Cyclothyrididae
Dimerellidae
Dispheniidae
Dogdoidae
Eatoniidae
Eoglossinotoechiidae
Erymnariidae
Eucharitinidae
Eumetabolotoechiidae
Frieleiidae
Glossinotoechiidae
Hadrorhynchiidae
Halorellidae
Hebetoechiidae
Hemithirididae
Hemithyrididae
Hypothyridinidae
Innaechiidae
Jacoburbirostridae
Jafarirhynchidae
Katuniidae
Ktenopotamorhynchidae
Ladogiidae
Lambdarinidae
Lanceomyoniidae
Leiorhynchidae
Leptocoeliidae
Machaerariidae
Meduanarostridae
Niorhynicidae
Norellidae
Notanopliidae
Notosariidae
Nucinulidae
Obturamentellidae
Ochotorhynchiidae
Oligorhynchiidae
Orthorhynchulidae
Parallelepipedorhynchidae
Paranorellidae
Peregrinellidae
Petasmariidae
Petasmatheridae
Phoenicitoechiidae
Platyterorhynchidae
Plectorhynchellidae
Pontisiidae
Praecyclothyrididae
Prionorhynchiidae
Psilocamaridae
狮鼻贝科 Pugnacidae
Pygmaellidae
小嘴贝科 Rhynchonellidae
Rhynchoporidae
Rhynchotetradidae
Rhynchotrematidae
Rhynchotretiidae
Rhynchotretradidae
Rozmanariidae
Salanygolinidae
Sapphicorhynchidae
Septalariidae
Septirhynchiidae
Sinorhynchiidae
Sphenotretidae
狭体贝科 Stenoscismatidae
Tethyrhynchiidae
Tetracameridae
Tetrarhynchiidae
Triasorhynchiidae
Trigonirhynchiidae
三角小嘴贝科 Trigonorhynchiidae
钩形贝科 Uncinulidae
韦勒贝科 Wellerellidae
云南贝科 Yunnanellidae
Zaigunrostridae
Zhejiangellidae
Aidynkulirhynchia Ovtsharenko, 1983
Ancistrorhynchia
Antistrixia
Aratella
Bailongjiangella Fu, 1982
Begiarslania Titova, 1992
Beichuanrhynchus Chen Yuanren, 1990
Bergalarai
Callaiaspida
Camarotoechiodes
Canavirila Sartenaer, 1994
Chathamirhynchia Lee & Motchurova-Dekova, 2008
Corrugatimediorostrum Sartenaer, 1970
Davinirhynchia
Dichotomosella Tchoumatchenco, 1987
Discamella Trotter & Talent, 2005
Dorsisinus Easton et al., 1958
Dorsisinus Sanders, 1958
Dzhangirhynchia
Ellassonia
Erectocephalus
Homeorhynchia
Hypoleiorhynchus Linnik, 1976
Irgislella
Kermanirhyncha Popov, Zaman, Baranov, Ghobadi Pour & Holmer, 2021
Ladogilinella Lyashenko, 1973
Ladogiodes
Langkawai
Laosia Mansuy, 1913
Leiorhynchoides
Leptocaryorhyncus
Linxiangxiella Yang, 1984
Machaerotoechia
Makridinirhynchia Sucic-Protic, 1969
Mediterranirhynchia Sucic-Protic, 1969
Meglopterorhynchus
Miaohuangrhynchus Yang, 1977
Microsphaeridiorhynchu
Minutalirhynchia
Omolonorhynchia
Orbiculatisiurostrum
Orthorhyncula
Paratetratomia Yang, 1977
Paryphorhynchopora
Payuella Grabau, 1934
Perakia Hamada, 1969
Physetorhynchia
Platyglossariorhynchus Sartenaer, 1970
Pompoecilorhynchus
Pontalorhynchia
Praegnamtenia
Praelacunosella
Protodorsisinus Trotter & Talent, 2005
Protorhyncha Hall & Clarke, 1894
Pseudocamaratoechia
Pseudocapillirhynchia Motchurova-Dekova, Radulovic & Metodiev, 2009
Pseudoglossirotoechia
Pseudonudirostra
Qilianotryma Xu, 1979
Qinlingotoechia Fu, 1983
Rhynchotetraoides
Rionorhynchia
Rostrirhynchia Sucic-Protic, 1969
Salairotoechia Rzhonsnitzkaya, 1968
Seminula M'Coy, 1844
Septemirostellum Roberts, 1971
Septocamarella
Serbiarhynchia
Sichuanrhynchis
Slovenirhynchia Siblik, 1967
Stegerhynchops
Sulciphoria Smirnova, 1992
Tainotoechia
Tasmalella
Tatjamoa
Tungussotoechia Lopushinskaya, 1976
Uralotoechia
Wairakiella
Wulungguia
Yanbianella Tong, 1978
Yukiangites
Yunshanella
Zanclorhyncha