New species: Amphora oamaruensis Schrader 1969     [Link to DiatomBase]

New species: Amphora obscura Krasske 1938     [Link to DiatomBase]

Lectotype: Amphora obscura Krasske 1938     [Link to DiatomBase]

New form: Amphora obtusa f. distinguenda Proschkina-Lavrenko 1963     [Link to DiatomBase]

New variety: Amphora obtusa var. baicalensis Jasnitzky 1936     [Link to DiatomBase]

New variety: Amphora obtusa var. baikalensis Skvortzow 1937     [Link to DiatomBase]

New variety: Amphora obtusa var. oamaruensis Schrader 1969     [Link to DiatomBase]

New name: Amphora obtusa var. skvortzowii VanLandingham 1967     [Link to DiatomBase]

New combination: Amphora obtusa var. typica (Cleve) Cleve-Euler 1953     [Link to DiatomBase]

New species: Amphora obtusaeformis Cholnoky 1961     [Link to DiatomBase]

Neotype: Amphora obtusiuscula Grunow in Schmidt et al. 1990     [Link to DiatomBase]

New species: Amphora ognjanovae D. Metzeltin & Z. Levkov in Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora ohridana Z. Levkov in Levkov, Krstic, Metzeltin & Nakov 2007     [Link to DiatomBase]

New species: Amphora okawangoi Cholnoky 1966     [Link to DiatomBase]

New name & status: Amphora oligotraphenta Lange-Bertalot in Lange-Bertalot & Metzeltin 1996     [Link to DiatomBase]

New combination: Amphora onclinorum (Compère) K. Krammer 1997     [Link to DiatomBase]

New species: Amphora oscitans Frenguelli 1938     [Link to DiatomBase]

Holotype: Amphora ostenfeldii Hustedt 1922     [Link to DiatomBase]

New name: Amphora ostrearia var. densepunctata Cleve-Euler 1953     [Link to DiatomBase]

New form: Amphora ovalis f. nebulosa Proschkina-Lavrenko 1963     [Link to DiatomBase]

New variety: Amphora ovalis var. barrowiana Patrick & Freese 1961     [Link to DiatomBase]

New variety: Amphora ovalis var. constricta Skvortzow 1937     [Link to DiatomBase]

New variety: Amphora ovalis var. elongata Jurilj 1954     [Link to DiatomBase]

New variety: Amphora ovalis var. lata Z. Levkov 2009     [Link to DiatomBase]

New variety: Amphora ovalis var. nikiskii Stone in McLaughlin & Stone 1986     [Link to DiatomBase]

New variety: Amphora ovalis var. tallingiae Gasse 1986     [Link to DiatomBase]

New variety: Amphora ovalis var. tenuis Z. Levkov 2009     [Link to DiatomBase]

New combination: Amphora ovalis var. typica (Cleve) Cleve-Euler 1953     [Link to DiatomBase]

New species: Amphora pampaninii Zanon 1948     [Link to DiatomBase]

New species: Amphora pannonica Hajós 1973     [Link to DiatomBase]

New species: Amphora pannucea Giffen 1984     [Link to DiatomBase]

New name: Amphora pantocsekii Hajós 1968     [Link to DiatomBase]

New species: Amphora paracopulata Z. Levkov & M. Edlund in Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora parallelistriata Manguin 1961     [Link to DiatomBase]

Validation: Amphora parallelistriata Manguin ex Kociolek & Reviers 1996     [Link to DiatomBase]

New variety: Amphora parallelistriata var. manguinii Foged 1971     [Link to DiatomBase]

New species: Amphora paraveneta H. Lange-Bertalot 2003     [Link to DiatomBase]

New species: Amphora parvula Proschkina-Lavrenko 1963     [Link to DiatomBase]

New species: Amphora paulii Patrick 1970     [Link to DiatomBase]

New variety: Amphora pediculus var. distincta Cleve-Euler 1949     [Link to DiatomBase]

New variety: Amphora pediculus var. nebulosa Proschkina-Lavrenko 1963     [Link to DiatomBase]

New variety: Amphora pediculus var. vetteri Cleve-Euler 1953     [Link to DiatomBase]

New species: Amphora peraffinis Z. Levkov 2009     [Link to DiatomBase]

Lectotype: Amphora peragallorum var. parvula Heiden in Heiden & Kolbe 1928     [Link to DiatomBase]

Isolectotype: Amphora peragallorum var. parvula Heiden in Heiden & Kolbe 1928     [Link to DiatomBase]

New species: Amphora pestilenta Giffen 1980     [Link to DiatomBase]

New species: Amphora piper Cholnoky 1968     [Link to DiatomBase]

New species: Amphora platensis Frenguelli 1945     [Link to DiatomBase]

New name: Amphora plativalvata T. Nagumo 2003     [Link to DiatomBase]

New species: Amphora pleniluna Hohn & Hellerman 1966     [Link to DiatomBase]

New species: Amphora polita Krasske 1939     [Link to DiatomBase]

Lectotype: Amphora polita Krasske 1939     [Link to DiatomBase]

New species: Amphora praelata Hendey 1973     [Link to DiatomBase]

New species: Amphora prespanensis Z. Levkov, S. Krstic & D. Metzeltin in Levkov, Krstic, Metzeltin & Nakov 2007     [Link to DiatomBase]

New species: Amphora profusa Giffen 1970     [Link to DiatomBase]

New species: Amphora proschkiniana Guslyakov 1987     [Link to DiatomBase]

New species: Amphora proteoides Hustedt 1955     [Link to DiatomBase]

Holotype: Amphora proteoides Hustedt 1955     [Link to DiatomBase]

New form: Amphora proteoides f. varians Proschkina-Lavrenko 1963     [Link to DiatomBase]

New form: Amphora proteus f. ambigua Proschkina-Lavrenko 1963     [Link to DiatomBase]

New form: Amphora proteus f. lacunata Jurilj 1957     [Link to DiatomBase]

New form: Amphora proteus f. nana Bodeanu 1976     [Link to DiatomBase]

New variety: Amphora proteus var. baikalensis Skvortzow 1937     [Link to DiatomBase]

New name: Amphora proteus var. gregorii Cleve-Euler 1953     [Link to DiatomBase]

New variety: Amphora proteus var. nodosa Jurilj 1957     [Link to DiatomBase]

New species: Amphora pseudaequalis Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora pseudoeximia Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora pseudoholsatica Nagumo & Kobayasi 1990     [Link to DiatomBase]

New species: Amphora pseudohyalina Simonsen 1960     [Link to DiatomBase]

Holotype: Amphora pseudohyalina Simonsen ex Hinz, Simonsen et Crawford 2012     [Link to DiatomBase]

New species: Amphora pseudominutissima Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora pseudomontana Cholnoky 1960     [Link to DiatomBase]

New species: Amphora pseudoproteus A.H. Wachnicka & E.E. Gaiser 2007     [Link to DiatomBase]

New species: Amphora pseudosibirica Z. Levkov & A. Pavlov in Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora pseudospectabilis Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora pseudotenuissima A.H. Wachnicka & E.E. Gaiser 2007     [Link to DiatomBase]

Holotype: Amphora pulchra Greville 1863     [Link to DiatomBase]

New species: Amphora punctata Andrews 1971     [Link to DiatomBase]

New species: Amphora punctata Schrader 1969     [Link to DiatomBase]

New species: Amphora pura Z. Levkov 2009     [Link to DiatomBase]

New name: Amphora pusio var. genuina Cleve-Euler 1953     [Link to DiatomBase]

New variety: Amphora pusio var. interrupta Cleve-Euler 1953     [Link to DiatomBase]

New species: Amphora ramsbottomi Salah 1955     [Link to DiatomBase]

New species: Amphora ranomafanensis Manguin 1952     [Link to DiatomBase]

New species: Amphora recens Z. Levkov & T. Nakov in Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora recondita Z. Levkov & T. Nakov in Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora recurva Meister 1937     [Link to DiatomBase]

New variety: Amphora reinholdii var. parva Poretzky ex Proschkina-Lavrenko 1953     [Link to DiatomBase]

New species: Amphora reniformis Guo, Xie & Li 1997     [Link to DiatomBase]

New species: Amphora reniformis Sreenivasa & Duthie 1971     [Link to DiatomBase]

New species: Amphora richardiana Cholnoky 1968     [Link to DiatomBase]

New species: Amphora ridicula Giffen 1976     [Link to DiatomBase]

New species: Amphora robertsonii Podzorski 1985     [Link to DiatomBase]

New name: Amphora robusta var. genuina Cleve-Euler 1953     [Link to DiatomBase]

New combination: Amphora robusta var. tenuissima (Cleve-Euler) Cleve-Euler 1953     [Link to DiatomBase]

New species: Amphora roettgeri Lee & Reimer 1984     [Link to DiatomBase]

New species: Amphora rognonii Gasse 1975     [Link to DiatomBase]

New species: Amphora rossi Hajós 1973     [Link to DiatomBase]

New species: Amphora rostrata Zanon 1948     [Link to DiatomBase]

New variety: Amphora rostrata var. minor Zanon 1948     [Link to DiatomBase]

New species: Amphora rostrigera Frenguelli 1938     [Link to DiatomBase]

New species: Amphora rotunda Skvortzow 1937     [Link to DiatomBase]

New species: Amphora rugosa Hustedt 1938     [Link to DiatomBase]

Lectotype: Amphora rugosa Hustedt 1938     [Link to DiatomBase]

Emended description: Amphora rugosa Hustedt emend Sala, Sar, Hinz et Sunesen 2006     [Link to DiatomBase]

New species: Amphora sabiniana Reimer in Patrick & Reimer 1975     [Link to DiatomBase]

New species: Amphora sabyii Salah 1955     [Link to DiatomBase]

New species: Amphora salsa Patrick & Freese 1961     [Link to DiatomBase]

New species: Amphora sancti-cataldi Zanon 1933     [Link to DiatomBase]

New species: Amphora sancti-naumii Z. Levkov & D. Metzeltin in Levkov, Krstic, Metzeltin & Nakov 2007     [Link to DiatomBase]

New variety: Amphora sanctimartiali var. faureli Amossé 1941     [Link to DiatomBase]

Lectotype: Amphora sarniensis Greville 1862     [Link to DiatomBase]

New species: Amphora scardica Z. Levkov 2009     [Link to DiatomBase]

Lectotype: Amphora schroederi Hustedt 1921     [Link to DiatomBase]

Emended description: Amphora schroederi Hustedt emend Sala, Sar, Hinz et Sunesen 2006     [Link to DiatomBase]

New species: Amphora scopulorum Giffen 1980     [Link to DiatomBase]

New species: Amphora sculpta Frenguelli 1934     [Link to DiatomBase]

New species: Amphora scutella A.H. Wachnicka & E.E. Gaiser 2007     [Link to DiatomBase]

New species: Amphora seminuda Meister 1937     [Link to DiatomBase]

New species: Amphora semperpalorum A.H. Wachnicka & E.E. Gaiser 2007     [Link to DiatomBase]

New species: Amphora serrata Skabichevskii 1936     [Link to DiatomBase]

New species: Amphora serrataeformis Z. Levkov 2009     [Link to DiatomBase]

New variety: Amphora sibirica var. gracilis Skvortzow 1937     [Link to DiatomBase]

New species: Amphora similis Z. Levkov 2009     [Link to DiatomBase]

Holotype: Amphora sinuata Greville 1863     [Link to DiatomBase]

New name: Amphora skvortzowii Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora spartinetensis Sullivan & Reimer 1975     [Link to DiatomBase]

New name: Amphora spitzbergenensis VanLandingham 1967     [Link to DiatomBase]

New species: Amphora splendida Rivera 1974     [Link to DiatomBase]

New species: Amphora spriggerica A.H. Wachnicka & E.E. Gaiser 2007     [Link to DiatomBase]

New species: Amphora staurohyalina Podzorski & Håkansson 1987     [Link to DiatomBase]

New species: Amphora staurosira Loseva 1982     [Link to DiatomBase]

New species: Amphora stechlinensis Z. Levkov & D. Metzeltin in Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora stoermerii M. Edlund & Z. Levkov in Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora streckerae Krammer 1997     [Link to DiatomBase]

New species: Amphora striata Hajós 1968     [Link to DiatomBase]

New species: Amphora strigosa Hustedt 1949     [Link to DiatomBase]

Lectotype: Amphora strigosa Hustedt 1949     [Link to DiatomBase]

New species: Amphora stroppiana Selva 1981     [Link to DiatomBase]

New species: Amphora subacutiuscula Schoeman 1972     [Link to DiatomBase]

New species: Amphora subaequalis Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora subangularis Hustedt 1955     [Link to DiatomBase]

Holotype: Amphora subangularis Hustedt 1955     [Link to DiatomBase]

New species: Amphora subatomus Z. Levkov 2009     [Link to DiatomBase]

New combination: Amphora subcapitata (Kisselev) Hustedt 1959     [Link to DiatomBase]

New name: Amphora subconstricta Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora subcostulata Stoermer & Yang 1971     [Link to DiatomBase]

New species: Amphora subcuneata Hustedt 1955     [Link to DiatomBase]

Holotype: Amphora subcuneata Hustedt 1955     [Link to DiatomBase]

New species: Amphora subholsatica K. Krammer 1997     [Link to DiatomBase]

New species: Amphora subhyalina Podzorski & Håkansson 1987     [Link to DiatomBase]

New species: Amphora sublaevis Hustedt 1955     [Link to DiatomBase]

Lectotype: Amphora sublaevis Hustedt 1955     [Link to DiatomBase]

Isolectotype: Amphora sublaevis Hustedt 1955     [Link to DiatomBase]

New species: Amphora submontana Hustedt 1949     [Link to DiatomBase]

Holotype: Amphora submontana Hustedt 1949     [Link to DiatomBase]

New variety: Amphora submontana var. ebroicensis Maillard 1978     [Link to DiatomBase]

Holotype: Amphora subrobusta Hustedt 1927     [Link to DiatomBase]

New variety: Amphora subrobusta var. pliocenica Frenguelli 1934     [Link to DiatomBase]

New species: Amphora subrotunda Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora subtilissima Schwabe & Simonsen 1961     [Link to DiatomBase]

New species: Amphora subtropica A.H. Wachnicka & E.E. Gaiser 2007     [Link to DiatomBase]

New species: Amphora subturbida Z. Levkov 2009     [Link to DiatomBase]

New species: Amphora subturgida Hustedt 1938     [Link to DiatomBase]

Holotype: Amphora subturgida Hustedt 1938     [Link to DiatomBase]

Emended description: Amphora subturgida Hustedt emend Sala, Sar, Hinz et Sunesen 2006     [Link to DiatomBase]

New species: Amphora sydowii Cholnoky 1963     [Link to DiatomBase]

New species: Amphora tamnaeana Guermeur 1954     [Link to DiatomBase]

New species: Amphora tanganyikae Caljon in Caljon & Cocquyt 1992     [Link to DiatomBase]

New species: Amphora tegetum A.H. Wachnicka & E.E. Gaiser 2007     [Link to DiatomBase]

New name: Amphora tenellula Giffen 1970     [Link to DiatomBase]

New species: Amphora tenerascens Cholnoky 1961     [Link to DiatomBase]

New species: Amphora tenerrima Aleem & Hustedt 1951     [Link to DiatomBase]

Lectotype: Amphora tenerrima Aleem & Hustedt 1951     [Link to DiatomBase]

New species: Amphora tenuissima Giffen 1967     [Link to DiatomBase]

New species: Amphora tenuissima Hustedt 1955     [Link to DiatomBase]

Holotype: Amphora tenuissima Hustedt 1955     [Link to DiatomBase]

New species: Amphora tenuistriata Manguin in Bourrelly & Manguin 1952     [Link to DiatomBase]

New combination: Amphora terroris var. rara (Frenguelli) VanLandingham 1967     [Link to DiatomBase]

New species: Amphora testudinata Hohn & Hellerman 1966     [Link to DiatomBase]

New species: Amphora thermalis Hustedt 1949     [Link to DiatomBase]

Lectotype: Amphora thermalis Hustedt 1949     [Link to DiatomBase]

Paralectotype: Amphora thermalis Hustedt 1949     [Link to DiatomBase]

New species: Amphora thromboliticola Cocquyt 1991     [Link to DiatomBase]

Problematic name: Amphora thumensis (A. Mayer) Krieger 1981     [Link to DiatomBase]

New species: Amphora tomiakae A. Witkowski, Lange-Bertalot & D. Metzeltin 2000     [Link to DiatomBase]

New species: Amphora torontoensis Sreenivasa & Duthie 1971     [Link to DiatomBase]

New species: Amphora tortonica Hajós 1968     [Link to DiatomBase]

New species: Amphora towutensis Hustedt 1942     [Link to DiatomBase]

Holotype: Amphora towutensis Hustedt 1942     [Link to DiatomBase]

New species: Amphora transfixa Meister 1937     [Link to DiatomBase]

New species: Amphora transsylvanica Jurilj 1954     [Link to DiatomBase]

New species: Amphora triseriata Ricard 1975     [Link to DiatomBase]

New species: Amphora triundulata Ross 1947     [Link to DiatomBase]

New species: Amphora tropidoneioides Salah 1955     [Link to DiatomBase]

New variety: Amphora truncata var. brevis Bodeanu 1976     [Link to DiatomBase]

New species: Amphora tucumana Herbst & Maidana 1988     [Link to DiatomBase]

New species: Amphora tumida Hustedt 1956     [Link to DiatomBase]

Lectotype: Amphora tumida Hustedt 1956     [Link to DiatomBase]

Isolectotype: Amphora tumida Hustedt 1956     [Link to DiatomBase]

Emended description: Amphora tumida Hustedt emend Sar, Sala, Hinz et Sunesen 2004     [Link to DiatomBase]

New species: Amphora turbida Z. Levkov 2009     [Link to DiatomBase]

New variety: Amphora turbida var. neothaumae Z. Levkov 2009     [Link to DiatomBase]

New variety: Amphora turgida var. africana Cholnoky 1962     [Link to DiatomBase]

New variety: Amphora turgida var. wisei Salah 1955     [Link to DiatomBase]

New species: Amphora twenteana K. Krammer 2003     [Link to DiatomBase]

Holotype: Amphora undulata Greville 1863     [Link to DiatomBase]

New species: Amphora vadosini A.H. Wachnicka & E.E. Gaiser 2007     [Link to DiatomBase]

New species: Amphora variabilis Kozyrenko 1959     [Link to DiatomBase]

New species: Amphora variabilis Kozyrenko 1961     [Link to DiatomBase]

New species: Amphora vaughanii Giffen 1980     [Link to DiatomBase]

New form: Amphora veneta f. globulosa Foged 1982     [Link to DiatomBase]

New variety: Amphora veneta var. angularis Stoermer 1963     [Link to DiatomBase]

New name: Amphora veneta var. angularis Stoermer & Kreis 1978     [Link to DiatomBase]

New variety: Amphora veneta var. balchaschica Makarova & Akhmetova 1987     [Link to DiatomBase]

New variety: Amphora veneta var. capitata Haworth 1974     [Link to DiatomBase]

New variety: Amphora veneta var. indica Skvortzow 1935     [Link to DiatomBase]

New variety: Amphora veneta var. subcapitata Kisselev 1932     [Link to DiatomBase]

New variety: Amphora veneta var. tumida Skvortzow 1975     [Link to DiatomBase]

New species: Amphora vetula Z. Levkov 2009     [Link to DiatomBase]

New variety: Amphora vetula var. baikalensis Z. Levkov 2009     [Link to DiatomBase]

Lectotype: Amphora vitrea Montagne 1861     [Link to DiatomBase]

Isotype: Amphora vitrea Montagne 1861     [Link to DiatomBase]

New species: Amphora waldeniana Stepanek et Kociolek 2013     [Link to DiatomBase]

New combination: Amphora wisei (Salah) Simonsen 1962     [Link to DiatomBase]

New combination: Amphora yarrensis (Schmidt) Krammer 2003