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Diatoms of North AmericaDiatoms of North America
Diatoms of North America
  • Practitioners
  • Morphology
    • Centric
    • Araphid
    • Eunotioid
    • Symmetric Biraphid
    • Monoraphid
    • Asymmetric Biraphid
    • Epithemioid
    • Nitzschioid
    • Surirelloid
  • Genera
  • Species
  • Glossary
  • About Us
    • News
    • Projects
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    • Taxon Contributors
    • Contact Us
  • What are diatoms?
Diatoms of North America
Morphological Category
  • Asymmetric Biraphid

    • Centric
    • Araphid
    • Eunotioid
    • Symmetric Biraphid
    • Monoraphid
    • Asymmetric Biraphid
    • Epithemioid
    • Nitzschioid
    • Surirelloid

Characteristics

  • Valves asymmetric to apical axis OR asymmetric to the transapical axis, or both
  • Raphe system well developed
  • Some genera possess apical porefields that secrete mucilaginous stalks
  • Other genera secrete mucilagous tubes

20 Genera

Afrocymbella Iconic

0Afrocymbella

Amphora Iconic 1

6Amphora

Brebissonia Iconic

1Brebissonia

Cymbella Iconic

34Cymbella

Cymbopleura Iconic

34Cymbopleura

Delicata Iconic

4Delicata

Didymosphenia Iconic

1Didymosphenia

Encyonema Iconic

24Encyonema

Encyonopsis Iconic  Aac

27Encyonopsis

Gomphoneis Iconic

13Gomphoneis

Gomphonella Iconic

1Gomphonella

Gomphonema Iconic

46Gomphonema

Gomphosinica Iconic

1Gomphosinica

Gomphosphenia Iconic

3Gomphosphenia

Halamphora Iconic  Aac

8Halamphora

Kurtkrammeria Iconic

7Kurtkrammeria

Navicymbula Iconic  Aac

1Navicymbula

Oricymba Iconic

0Oricymba

Reimeria Iconic  Aac

3Reimeria

Rhoicosphenia Iconic

3Rhoicosphenia

Rhoicosphenia Iconic

3Rhoicosphenia

Reimeria Iconic  Aac

3Reimeria

Oricymba Iconic

0Oricymba

Navicymbula Iconic  Aac

1Navicymbula

Kurtkrammeria Iconic

7Kurtkrammeria

Halamphora Iconic  Aac

8Halamphora

Gomphosphenia Iconic

3Gomphosphenia

Gomphosinica Iconic

1Gomphosinica

Gomphonema Iconic

46Gomphonema

Gomphonella Iconic

1Gomphonella

Gomphoneis Iconic

13Gomphoneis

Encyonopsis Iconic  Aac

27Encyonopsis

Encyonema Iconic

24Encyonema

Didymosphenia Iconic

1Didymosphenia

Delicata Iconic

4Delicata

Cymbopleura Iconic

34Cymbopleura

Cymbella Iconic

34Cymbella

Brebissonia Iconic

1Brebissonia

Amphora Iconic 1

6Amphora

Afrocymbella Iconic

0Afrocymbella

0Afrocymbella
31Amphora
1Brebissonia
71Cymbella
41Cymbopleura
5Delicata
1Didymosphenia
59Encyonema
33Encyonopsis
21Gomphoneis
2Gomphonella
100Gomphonema
2Gomphosinica
6Gomphosphenia
18Halamphora
7Kurtkrammeria
1Navicymbula
0Oricymba
4Reimeria
4Rhoicosphenia
4Rhoicosphenia
4Reimeria
0Oricymba
1Navicymbula
7Kurtkrammeria
18Halamphora
6Gomphosphenia
2Gomphosinica
100Gomphonema
2Gomphonella
21Gomphoneis
33Encyonopsis
59Encyonema
1Didymosphenia
5Delicata
41Cymbopleura
71Cymbella
1Brebissonia
31Amphora
0Afrocymbella

Diatoms of North America

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