The Freshwater Diatoms of Ireland
The following is an attempt to present a complete and up to date listing of Irish freshwater diatoms and we would welcome the submission of any additions or corrections.
Valid taxa are justified left; synonyms are right-indented.
Preparation of this list was greatly facilitated through the continual use of:
Catalogue of Diatom Names, California Academy of Sciences, On-line Version.
Compiled by Elisabeth Fourtanier & J. Patrick Kociolek.
Available online at http://www.calacademy.org/research/diatoms/names/index.asp
Freshwater genera A-E
ACANTHOCERAS Honigmann 1910
A. zachariasii (Brun) Simonsen
Attheya zachariasii Brun
A. altaica (Poretzky) Cleve-Euler
A. borealis A. Cleve
A. brevipes Agardh
A. brevipes var. intermedia (Kützing) Cleve
A. brevipes var. parvula (Kützing) Cleve
A. coarctata (Brébisson) Grunow
A. detha Hohn & Hellerman
A. gysingensis (Foged) Lange-Bertalot in Lange-Bertalot & Krammer
Navicula gysingensis Foged
A. impexa Lange-Bertalot in Lange-Bertalot & Krammer
A. minutissima var. cryptocephala Grunow
A. obliqua (Gregory) Hustedt
A. recurvata Hustedt
A. rostellata Cleve-Euler
A. rupestris Krasske
A. saxonica Krasske
A. trinodis (W. Smith) Grunow
A. ventralis (Krasske) Lange-Bertalot in Lange-Bertalot & Krammer
Navicula ventralis Krasske
ACHNANTHIDIUM Kützing 1844
A. biasolettianum (Kützing) Bukhtiyarova
Achnanthes biasolettiana (Kützing) Grunow
A. exiguum (Grunow) Czarnecki
Achnanthes exigua Grunow
A. exiguum var. heterovalvatum (Krasske) Czarnecki
Achnanthes exigua var. heterovalvata Krasske
A. exile (Kützing) Heiberg
Achnanthes exilis Kützing
A. helveticum (Hustedt) Monnier, Lange-Bertalot & Ector in Monnier et al.
Achnanthes helvetica (Hustedt) Lange-Bertalot in Lange-Bertalot & Krammer
A. minutissimum (Kützing) Czarnecki
Achnanthes minutissimaKützing
A. minutissimum var. affinis (Grunow) Bukhtiyarova
Achnanthes affinis Grunow
A. subatomoides (Hustedt) Monnier, Lange-Bertalot & Ector in Monnier et al.
Navicula subatomoides Hustedt
ADLAFIA Moser, Lange-Bertalot & Metzeltin 1998
A. bryophila (Petersen) Moser, Lange-Bertalot & Metzeltin
Navicula bryophila Petersen
A. minuscula var. muralis (Grunow) Lange-Bertalot in Lange-Bertalot & Genkal
Navicula muralis Grunow in Van Heurck
A. suchlandtii (Hustedt) Moser, Lange-Bertalot & Metzeltin
Navicula suchlandtii Hustedt
AMPHIPLEURA Kützing 1844
A. pellucida (Kützing) Kützing
AMPHORA Ehrenberg ex Kützing 1844
A. copulata (Kützing) Schoeman & Archibald
A. ovalis var. libyca (Ehrenberg) Cleve
A. libyca Ehrenberg
A. montana Krasske
A. normannii Rabenhorst
A. oligotraphenta Lange-Bertalot in Lange-Bertalot & Metzeltin
A. veneta var. capitata E. Haworth
A. ovalis (Kützing) Kützing
A. pediculus (Kützing) Grunow ex Schmidt
A. ovalis var. pediculus (Kützing) Van Heurck
A. parallelistriata Manguin ex Kociolek & Reviers
A. perpusilla (Grunow in Van Heurck) Grunow in Van Heurck
A. thumensis (Mayer) Krieger
Cymbella thumensis (Mayer) Hustedt
A. veneta Kützing
ANEUMASTUS D. Mann & Stickle in Round et al. 1990
A. stroesei (Østrup) D. Mann in Round et. al.
Navicula pseudotuscula Hustedt
A. tuscula (Ehrenberg) D. Mann & Stickle in Round et al.
Navicula tuscula Ehrenberg
? Navicula tuscula var. capitata (Fontell) Cleve-Euler
A. tuscula fo. minor (Hustedt) Bukhtiyarova
Navicula tuscula fo. minor Hustedt
A. tuscula fo. rostrata (Hustedt) Bukhtiyarova
Navicula tuscula fo. rostrata Hustedt
A. tusculoides (Cleve-Euler) D. Mann in Round et al.
Navicula tusculoides Cleve-Euler
ANOMOEONEIS Pfitzer 1871
A. sphaerophora (Kützing) Pfitzer
ASTERIONELLA Hassall 1850
A. formosa Hassall
A. gracillima (Hantzsch in Rabenhorst) Heiberg
A. ralfsii W. Smith
AULACOSEIRA Thwaites 1848
A. alpigena (Grunow) Krammer
Melosira distans var. alpigena Grunow in Van Heurck
A. ambigua (Grunow) Simonsen
Melosira ambigua (Grunow in Van Heurck) O.Müller
A. crenulata(Ehrenberg) Krammer
A. distans (Ehrenberg) Simonsen
Melosira distans (Ehrenberg) Kützing
A. fennoscandica (A. Cleve-Euler) Ross in Hartley
Melosira fennoscandica Cleve-Euler
A. granulata (Ehrenberg) Simonsen
Melosira granulata (Ehrenberg) Ralfs in Pritchard
A. granulata var. angustissima (O. Müller) Simonsen
Melosira granulata var. angustissima O. Müller
A. granulata fo. curvata (Hustedt) Simonsen
Melosira granulata fo. curvata Hustedt
A. islandica (O. Müller) Simonsen
Melosira islandica O. Müller
A. islandica ssp. helvetica (O. Müller) Simonsen
Melosira islandica ssp. helvetica O. Müller
A. italica (Ehrenberg) Simonsen
Melosira italica (Ehrenberg) Kützing
A. lacustris(Grunow in Van Heurck) Krammer
Melosira distans fo. lacustris (Grunow in Van Heurck) Hustedt
? Melosira mikkelsenii Nygaard
A. lirata(Ehrenberg) Ross
Melosira distans var. lirata (Ehrenberg) O. Müller
A. liratavar. seriata (O. Müller) Vyverman
Melosira distans fo. seriata (O. Müller) Hustedt
A. perglabra (Østrup) Haworth
? Melosira excurrens Nygaard
? Melosira fennoscandia Cleve-Euler
A. subarctica (O. Müller) Haworth
Melosira italica ssp. subarctica O. Müller
A. valida (Grunow) Krammer
Melosira italica var. valida Grunow
BERKELEYA Greville 1827
B. rutilans (Trentepohl ex Roth) Grunow
Amphipleura rutilans (Trentepohl ex Roth) Cleve
BIREMIS D. Mann & Cox in Round et al. 1990
B. zachariasii (Reichelt) Edlund, Andresen & Soninkhisig
Oestrupia zachariasii (Reichelt) Hustedt
BRACHYSIRA Kützing 1836
B. brebissonii Ross in Hartley
Anomoeoneis serians var. brachysira (Brébisson) Cleve
Anomoeoneis serians var. thermalis (Grunow) Hustedt
B. exilis (Kützing) Round & Mann
Anomoeoneis exilis (Kützing) Cleve
B. follis (Ehrenberg) Ross in Hartley
Anomoeoneis follis (Ehrenberg) Cleve
B. microcephala (Kützing) Compère
Achnanthes microcephala (Kützing) Grunow
B. serians (Brébisson) Round & Mann
Anomoeoneis serians (Brébisson) Cleve
B. styriaca (Grunow in Van Heurck) Ross in Hartley
Anomoeoneis styriaca (Grunow in Van Heurck) Hustedt
B. vitrea (Grunow) Ross in Hartley
Anomoeoneis vitrea (Grunow) Ross in Patrick & Reimer
B. vitrea fo. lanceolata (Mayer) Schoeman & Archibald
Anomoeoneis exilis fo. lanceolata (A. Mayer) Hustedt
B. zellensis (Grunow) Round & Mann
Anomoeoneis zellensis (Grunow) Cleve
B. zellensis fo. difficilis (Grunow in Van Heurck) Hamilton
Anomoeoneis zellensis fo. difficilis (Grunow) Hustedt
C. alpestris (Grunow) Cleve
C. amphisbaena (Bory) Cleve
C. bacillaris (Gregory) Cleve
C. bacillum (Grunow) Cleve
Pinnularia fasciata (Lagerstedt) Hustedt
C. clevei (Lagerstedt) Cleve
C. formosa (Gregory) Cleve
C. hebes (Ralfs in Pritchard) Patrick
C. obtusa (W. Smith) Cleve
C. latiuscula (Kützing) Cleve
C. latiuscula var. subholstei Hustedt
C. leptosoma (Grunow) Krammer in Krammer & Lange-Bertalot
Pinnularia leptosoma (Grunow in Van Heurck) Cleve
C. limosa (Kützing) Patrick
C. schumanniana (Grunow) Cleve
C. silicula var. gibberula (Kützing) Grunow
C. limosa var. biconstricta (Grunow) Foged
C. schumanniana var. biconstricta (Grunow) Reichelt
C. macedonica Hustedt
C. molaris (Grunow) Krammer in Krammer & Lange-Bertalot
Pinnularia molaris (Grunow) Cleve
C. obtusa (W. Smith) Cleve
C. schumanniana fo. fontinalis Foged2
C. sublinearis (Grunow) Krammer in Krammer & Lange-Bertalot
Pinnularia sublinearis (Grunow in Van Heurck) Cleve
C. undulata (Gregory) Krammer in Krammer & Lange-Bertalot
Pinnularia undulata Gregory
? Pinnularia undulata var. stauroneiformis (Hustedt) Cleve-Euler
C. ventricosa (Ehrenberg) Meister
C. silicula (Ehrenberg) Cleve
C. ventricosa var. truncatula (Grunow) Meister
C. silicula var. truncatula (Grunow) Cleve
CAMPYLODISCUS Ehrenberg ex Kützing 1844
C. hibernicus Ehrenberg
C. noricus Ehrenberg
CAVINULA D. Mann & Stickle in Round et. al. 1990
C. cocconeiformis (Gregory ex Greville) D. Mann & Stickle
Navicula cocconeiformis Gregory ex Greville
C. jaernefeltii (Hustedt) D. Mann & Stickle
Navicula jaernefeltii Hustedt
C. lacustris (Gregory) D. Mann & Stickle
Navicula lacustris Gregory
C. lapidosa (Krasske) Lange-Bertalot in Lange-Bertalot & Metzeltin
Navicula lapidosa Krasske
C. pseudoscutiformis (Hustedt) D. Mann & Stickle
Navicula pseudoscutiformis Hustedt
C. scutelloides (W. Smith) Lange-Bertalot in Lange-Bertalot & Metzeltin
Navicula scutelloides W. Smith
C. variostriata (Krasske) D. Mann in Round et al.
Navicula variostriata Krasske
CHAMAEPINNULARIALange-Bertalot & Krammer in Lange-Bertalot & Metzeltin 1996
C. krookii (Grunow) Lange-Bertalot & Krammer in Lange-Bertalot & Genkal
Pinnularia krookei Grunow (Foged, sic)
C. mediocris (Krasske) Lange-Bertalot in Lange-Bertalot & Metzeltin
Navicula mediocris Krasske
C. soehrensis var. hassiaca (Krasske) Lange-Bertalot in Lange-Bertalot & Metzeltin
Navicula hassiaca Krasske
COCCONEIS Ehrenberg 1837
C. disculus (Schumann) Cleve
C. disculus var. diminuta (Pantocsek) Cleve-Euler
C. diminuta Pantocsek
C. hustedtii Krasske
C. pediculus Ehrenberg
C. placentula Ehrenberg
C. placentula var. euglypta (Ehrenberg) Grunow
C. placentula var. klinoraphis Geitler
C. placentula var. lineata (Ehrenberg) Van Heurck
C. placentula var. linearis (Ehrenberg) Cleve (sic)
C. scutellum Ehrenberg
C. scutellum var. parva Grunow in Van Heurck
C. thumensis Mayer
COSMIONEIS D. Mann & Stickle in Round et al. 1990
C. pusilla (W. Smith) D. Mann & Stickle in Round et al.
Navicula pusilla W. Smith
CRATICULA Grunow 1867
C. ambigua (Ehrenberg) Mann in Round, Crawford & Mann
Navicula cuspidata var. ambigua (Ehrenberg) Cleve
C. cuspidata (Kützing) Mann in Round, Crawford & Mann
Navicula cuspidata (Kützing) Kützing
C. cuspidata var. heribaudiii (Peragallo) D. Mann in Round et al.
C. halophila (Grunow ex Van Heurck) D. Mann in Round, Crawford & D. Mann
Navicula halophila Grunow in Van Heurck
CTENOPHORA Williams & Round 1986
C. pulchella (Ralfs ex Kützing) Williams & Round
Fragilaria pulchella (Ralfs ex Kützing) Lange-Bertalot
Synedra pulchella (Ralfs) Kützing
? Synedra pulchella var. naviculacea Grunow in Van Heurck
CYCLOSTEPHANOS Round in Theriot et al. 1987
C. dubius (Fricke) Round
Stephanodiscus dubius (Fricke) Hustedt
C. invisitatus (Hohn & Hellerman) Theriot, Stoermer & Håkansson
C. tholiformis Stoermer, Håkansson & Theriot
CYCLOTELLA (Kützing) Brébisson 1838
C. atomus Hustedt
C. comensis Grunow in Van Heurck
C. kuetzingiana var. radiosa Fricke3
C. ocellata Pantocsek
C. kuetzingiana var. planetophora Fricke
C. radiosa (Grunow) Lemmermann
C. comta (Ehrenberg) Kützing
C. rossii Håkansson
C. comta var. oligactis (Ehrenberg) Grunow in Van Heurck
C. striata (Kützing) Grunow
C. striata var. bipunctata Fricke
C. unipunctata Håkansson & Carter
CYMATOPLEURA W. Smith 1851
C. elliptica (Brébisson) W. Smith
C. elliptica var. constricta Grunow
C. elliptica var. hibernica (W. Smith) Van Heurck
C. solea (Brébisson) W. Smith
C. librile (Ehrenberg) Pantocsek
C. solea var. graciloides Cleve-Euler
C. solea var. regula (Ehrenberg) Grunow
C. solea var. apiculata (W. Smith) Ralfs in Pritchard
C. librile var. apiculata (W. Smith) Descy
CYMBELLA Agardh 1830
C. aequalis W. Smith ex Greville
C. affinis Kützing
C. aspera (Ehrenberg) Cleve
C. cistula (Hemprich in Hemprich & Ehrenberg) Kirchner
C. cistula var. maculata (Kützing) Van Heurck
C. cymbiformis Agardh
C. cymbiformis var. subrhomboidea Østrup
C. designata Krammer in Krammer & Lange-Bertalot
C. diluviana (Krasske) Florin
C. ehrenbergii Kützing4
C. inaequalis (Ehrenberg) Rabenhorst
C. elginensis Krammer
C. turgida Gregory
C. helvetica Kützing
C. helvetica var. compacta (Østrup) Hustedt
C. heteropleura (Ehrenberg) Kützing
C. hustedtii Krasske
C. laevis Nägeli in Kützing
C. lanceolata (Ehrenberg) Van Heurck
C. lanceolata var. notata Poretzky
C. leptoceros (Ehrenberg) Kützing
C. obtusa Gregory
C. obtusiuscula Kützing
C. pseudonorvegica Haworth5
C. tumida (Brébisson in Kützing) Van Heurck
C. tumidula Grunow in Schmidt
C. turgidula Grunow in Schmidt
CYMBELLONITZSCHIA Hustedt 1924
C. diluviana Hustedt
CYMBOPLEURA Krammer 1999
C. amphicephala (Nägeli) Krammer
Cymbella amphicephala Nägeli ex Kützing
C. angustata (W. Smith) Krammer
Cymbella angustata (W. Smith) Cleve
C. austriaca (Grunow) Krammer
Cymbella austriaca Grunow in Schmidt
C. cuspidata (Kützing) Krammer
Cymbella cuspidata Kützing
C. hauckii (Van Heurck) Krammer
Cymbella hauckii Van Heurck
C. hybrida (Grunow) Krammer
Cymbella hybrida Grunow
C. incerta (Grunow) Krammer
Cymbella incerta Grunow
C. incertiformis var. linearis (Fontell) Krammer
Cymbella angustata var. linearis (Fontell) Ross
C. lata (Grunow) Krammer
Cymbella lata Grunow
C. naviculiformis (Auerswald ex Heiberg) Krammer
Cymbella naviculiformis Auerswald ex Heiberg
C. reinhardtii (Grunow) Krammer
C. similis(Krasske) Krammer
Cymbella similis Krasske
C. subcuspidata (Krammer) Krammer
Cymbella subcuspidata Krammer
Cymbella heteropleura var. minor Cleve
DECUSSATA (Patrick) Lange-Bertalot 2000
D. placenta (Ehrenberg) Lange-Bertalot & Metzeltin
Navicula placenta Ehrenberg
DELICATA Krammer 2003
D. delicatula (Kützing) Krammer
Cymbella delicatula Kützing
DENTICULA Kützing 1844
D. kuetzingii Grunow
Nitzschia denticula Grunow in Cleve & Grunow
D. tenuis Kützing
D. tenuis var. crassula (Nägeli) Hustedt
DIADESMIS Kützing 1844
D. contenta (Grunow in Van Heurck) D. Mann
Navicula contenta Grunow in Van Heurck
D. contenta var. biceps (Grunow in Van Heurck) Hamilton in Hamilton et al.
Navicula contenta var. biceps Grunow in Van Heurck
D. contenta var. parallela (Petersen) Spaulding in Spaulding et al.
Navicula contenta var. parallela Petersen
D. gallica var. perpusilla (Grunow) Bukhtiyarova
D. perpusilla (Kützing) D. Mann
Navicula perpusilla (Kützing) Grunow
DIATOMA Bory 1824
D. ehrenbergii Kützing
D. vulgaris var. ehrenbergii (Kützing) Grunow
D. vulgaris var. grande (W. Smith) Grunow
D. hyemalis (Roth) Heiberg
D. hiemale (Lyngbye) Heiberg
D. mesodon (Ehrenberg) Kützing
D. hiemale var. mesodon (Ehrenberg) Grunow
D. tenuis Agardh
D. elongatum (Lyngbye) Agardh
D. elongatum var. minor Grunow
D. elongatum var. tenuis (Agardh) Van Heurck
D. vulgaris Bory
D. vulgaris var. linearis Grunow in Van Heurck
D. vulgaris var. producta Grunow
DIATOMELLA Greville 1855
D. balfouriana Greville
DIDYMOSPHENIA M. Schmidt 1899
D. geminata (Lyngbye) M. Schmidt
DIPLONEIS Ehrenberg 1844
D. boldtiana Cleve
D. domblittensis (Grunow) Cleve
D. domblittensis var. subconstricta A. Cleve
D. elliptica (Kützing) Cleve
D. finnica (Ehrenberg) Cleve
D. interrupta (Kützing) Cleve
D. marginestriata Hustedt
D. minuta Petersen
D. oblongella (Naegeli ex Kützing) Ross
D. ovalis var. oblongella (Naegeli) Cleve
D. oculata (Brébisson) Cleve
D. ovalis (Hilse in Rabenhorst) Cleve
D. petersenii Hustedt
D. pseudovalis Hustedt
D. puella (Schumann) Cleve
D. smithii var. pumila (Grunow) Hustedt6
D. subovalis Cleve
DISCOSTELLA Houk & Klee 2004
D. glomerata (Bachmann) Houk & Klee
Cyclotella glomerata Bachmann
D. pseudostelligera (Hustedt) Houk & Klee
Cyclotella pseudostelligera Hustedt
D. stelligera (Cleve & Grunow) Houk & Klee
Cyclotella stelligera Cleve & Grunow in Cleve
D. stelligeroides (Hustedt) Houk & Klee
Cyclotella stelligeroidesHustedt
ELLERBECKIA Crawford 1988
E. arenaria (Moore ex Ralfs) Crawford
Melosira arenaria Moore
E. arenaria fo. teres (Brun) Crawford
ENCYONEMA Kützing 1833
E. auerswaldii Rabenhorst
Cymbella ventricosa var. auerswaldii (Rabenhorst) Meister
E. caespitosum Kützing
E. caespitosum var. semicirculare (Lagerstedt) Mayer
Cymbella ventricosa var. semicircularis (Lagerstedt) Ross
E. gaeumannii (Meister) Krammer
Cymbella gaeumannii Meister
E. gracile Rabenhorst
Cymbella gracilis (Rabenhorst) Cleve
E. hebridicum (Gregory) Grunow in Cleve & Möller
Cymbella hebridica (Grunow in Cleve & Möller) Cleve
E. hilliardii (Manguin) Krammer
Cymbella hilliardii Manguin
E. lacustre (Agardh) D. Mann
Cymbella lacustris (Agardh) Cleve
E. minutum (Hilse in Rabenhorst) D. Mann
Cymbella minuta Hilse in Rabenhorst
Cymbella ventricosa var. minuta (Hilse in Rabenhorst) Cleve-Euler
E. minutum var. pseudogracilis (Cholnoky) Czarnecki
Cymbella turgida var. pseudogracilis Cholnoky
E. norvegica (Grunow in Schmidt) Bukhtiyarova
Cymbella norvegica Grunow in Schmidt
E. perpusillum (Cleve) D. Mann
Cymbella perpusilla Cleve
E. prostratum (Berkeley) Kützing
Cymbella prostrata (Berkeley) Cleve
E. turgidum (Gregory) Grunow in Schmidt
Cymbella turgida Gregory
E. ventricosum (Kützing) Grunow in Schmidt
Cymbella ventricosa Kützing
ENCYONOPSIS Krammer 1997
E. cesatii (Rabenhorst) Krammer
Cymbella cesatii (Rabenhorst) Grunow in Schmidt
E. descripta (Hustedt) Krammer
Cymbella descripta (Hustedt) Krammer & Lange-Bertalot
E. microcephala (Grunow) Krammer
Cymbella microcephala Grunow
ENTOMONEIS Ehrenberg 1845
E. alata Ehrenberg
Amphiprora alata (Ehrenberg) Kützing
E. ornata (Bailey) Reimer in Patrick & Reimer
Amphiprora ornata Bailey
EOLIMNA Lange-Bertalot & Schiller in Schiller & Lange-Bertalot 1997
E. minima (Grunow in Van Heurck) Lange-Bertalot in Moser et al.
Navicula minima Grunow
E. tantula (Hustedt) Lange-Bertalot in Werum & Lange-Bertalot
Navicula tantula Hustedt
EPITHEMIA Brébisson ex Kützing 1844
E. adnata (Kützing) Brébisson
E. zebra (Ehrenberg) Kützing
E. zebra var. porcellus (Kützing) Grunow
E. zebra var. saxonica (Kützing) Grunow
E. argus (Ehrenberg) Kützing
E. longicornis (Ehrenberg) W. Smith
E. argus var. alpestris (W. Smith) Grunow
E. frickei Krammer
E. intermedia Fricke in Schmidt
E. goeppertiana Hilse
E. muelleri Fricke in Schmidt
E. hyndmannii W. Smith
E. ocellata (Ehrenberg) Kützing7
E. reichelti Fricke
E. smithii Carruthers
E. sorex Kützing
E. sorex var. gracilis Hustedt
E. turgida (Ehrenberg) Kützing
E. turgida var. capitata Fricke
E. turgida var. granulata (Ehrenberg) Brun
EUCOCCONEIS Cleve ex Meister 1912
E. austriaca (Hustedt) Lange-Bertalot
Achnanthes austriaca Hustedt
E. depressa (Cleve) Lange-Bertalot
Achnanthes depressa (Cleve) Hustedt
E. flexella (Kützing) Meister
Achnanthes flexella (Kützing) Brun
E. flexella var. alpestris (Brun) Hustedt
Achnanthes flexella var. alpestris Brun
E. laevis (Østrup) Lange-Bertalot
Achnanthes laevis Østrup
E. lapponica Hustedt
Achnanthes lapponica Hustedt
EUNOTIA Ehrenberg 1837
E. arcuoides Foged
E. arcus Ehrenberg
E. arcus var. bidens Grunow in Van Heurck
E. arcus var. fallax Hustedt
E. bactriana Ehrenberg
E. bidentula W. Smith
E. bidentuloides Foged
E. bidens Ehrenberg
E. praerupta var. bidens Grunow in Cleve & Grunow
E. bigibba Kützing sensu Grunow
E. bigibba var. pumila Grunow
E. bilunaris (Ehrenberg) Mills
E. lunaris (Ehrenberg) Grunow in Van Heurck
E. compacta (Hustedt) Mayama
E. exigua var. compacta Hustedt
E. curtagrunowii Nörpel-Schempp & Lange-Bertalot
E. praerupta var. curta Grunow in Van Heurck
E. praerupta var. muscicola Petersen
E. denticulata (Brébisson) Rabenhorst
E. diadema Ehrenberg
E. robusta var. diadema (Ehrenberg) Ralfs in Pritchard
E. diodon Ehrenberg
E. elegans Østrup
E. exigua (Brébisson ex Kützing) Rabenhorst
E. faba Ehrenberg
E. faba fo. rhomboidea Foged
E. fallax Cleve8
E. flexuosa (Brébisson) Kützing
E. flexuosa var. pachycephala Grunow in Van Heurck
E. formica Ehrenberg
E. glacialis Meister
E. hemicyclus (Ehrenberg) Ralfs in Pritchard
Amphicampa hemicyclus (Ehrenberg) Karsten
Semiorbis hemicyclus (Ehrenberg) Patrick in Patrick & Reimer
E. iatriaensis Foged
E. incisa Gregory
E. jemtlandica (Fontell) Cleve-Euler
E. monodon var. bidens (Gregory) Hustedt
E. lapponica Grunow ex A. Cleve
E. maior (W. Smith) Rabenhorst9
E. meisteri Hustedt
E. microcephala Krasske
E. microcephala var. tridentata (Mayer) Hustedt
E. minor (Kützing) Grunow in Van Heurck
E. pectinalis var. minor (Kützing) Rabenhorst
E. monodon Ehrenberg
? E. maior var. ventricosa A. Cleve
? E. monodon var. maior (W. Smith) Hustedt
? E. maior var. compacta Berg
? E. maior var. scandia Cleve-Euler
E. naegelii Migula in Thomé
E. alpina (Nägeli) Hustedt
E. papilio (Ehrenberg) Hustedt10
E. parallela Ehrenberg
E. parallela var. angusta Grunow
E. parallela var. densestriata Fontell
E. pectinalis (Dillwyn) Rabenhorst
E. pectinalis var. undulata (Ralfs) Rabenhorst
E. pectinalis var. ventralis (Ehrenberg) Hustedt
E. pectinalis var. ventricosa (Ehrenberg) Grunow in Van Heurck
E. polydentula (Brun) Hustedt
E. praerupta Ehrenberg
E. rhomboidea Hustedt
E. septentrionalis Østrup11
E. serra Ehrenberg
E. robusta Ralfs in Pritchard
E. subarcuatoides Alles, Nörpel & Lange-Bertalot
E. lunaris var. subarcuata (Nägeli) Grunow in Van Heurck
E. sudetica O. Müller
E. sudetica var. bidens Hustedt in Schmidt
E. tenella (Grunow) Hustedt in Schmidt
E. tetraodon Ehrenberg
E. robusta var. tetraodon (Ehrenberg) Ralfs in Pritchard
E. trinacria Krasske
E. valida Hustedt 1930
E. gracilis (Ehrenberg) Rabenhorst
E. variundulata Nörpel-Schempp & Lange-Bertalot in Lange-Bertalot et al.
E. exigua var. bidens Hustedt
E. veneris (Kützing) De Toni
ENDNOTES
1. Although it seems to be generally agreed that Achnanthesis an almost exclusively marine genus (with the exception of A. coarctata), the species listed here have apparently not been moved to other freshwater genera. Although Achnanthes minutissima was moved to Achnanthidium, its variety cryptocephala apparently was not, and its taxonomic status is thus unclear.
2. Since C. schumanniana is a junior synonym of C. limosa, this form should be moved accordingly.
3. Håkansson has shown that C. kuetzingiana is a junior synonym of C. meneghiniana, later moved to the new genus Stephanocyclus. Presumably, then, the form radiata also belongs in Stephanocyclus, if it’s valid at all.
4. C. ehrenbergii seems to be the currently accepted name, as the basionym for C. inaequalis was apparently not validly published. The Atlas of British Diatoms, however, continues to use the latter name.
5. This species probably should be moved to Encyonema.
6. Foged (1977) claims that this taxon is synonymous with D. puella (Schumann) Cleve. This is in error, and it is thus an open question as to which taxon Foged had.
7. Krammer and Lange-Bertalot (1997) argue that Ehrenberg’s Eunotia ocellata is not recognisable. They place it with Epithemia argus.
8. Several new species near E. fallax have been recently described, and Irish specimens in this group need to be re-examined.
9. The situation as regards E. maior and E. monodon, with their many varieties, is a taxonomic morass. Whether these taxa are distinct or not, and if so, which varieties go with which species, are questions requiring additional research.
10. This is almost certainly a misidentification. According to Krammer and Lange-Bertalot (2004), E. papilio is a tropical species, not found in Europe. Perhaps this represents E. pseudopapilio Lange-Bertalot & Nörpel-Schempp in Metzeltin & Lange-Bertalot.
11. It is likely that some specimens identified as E. septentrionalis should be referred instead to the very similar E. ursamaioris Lange-Bertalot & Nörpel-Schempp in Lange-Bertalot & Genkal. Both probably occur in Ireland.
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