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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
    • Review Board
    • Taxon Contributors
    • Contact Us
  • What are diatoms?
Diatoms of North America
Morphological Category
  • Araphid

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

Characteristics

  • Valves with bilateral symmetry (symmetric about a line)
  • Cells lack a raphe system and lack significant motility
  • Rimoportulae (labiate process) may be present

28 Genera

Ardissonea iconic

0Ardissonea

Asterionella Iconic2

2Asterionella

Ctenophora Iconic

1Ctenophora

Diatoma Iconic

4Diatoma

Diprora Iconic

1Diprora

Distrionella Iconic

1Distrionella

Fragilaria

9Fragilaria

Fragilariforma Iconic

8Fragilariforma

Grammatophora iconic

0Grammatophora

Hannaea Iconic

2Hannaea

Meridion Iconic

5Meridion

Nanofrustulum iconic

1Nanofrustulum

Neofragilaria iconic

0Neofragilaria

Odontidium Iconic

2Odontidium

Oxyneis Iconic

2Oxyneis

Pseudostaurosira Iconic

8Pseudostaurosira

Staurosomething Iconic

0Pseudostaurosiropsis

Punctastriata Iconic  Aac

1Punctastriata

Stauroforma Iconic

1Stauroforma

Staurosira Iconic

4Staurosira

Staurosirella Iconic Aac

6Staurosirella

Synedra Iconic

4Synedra

Tabellaria Iconic

2Tabellaria

Tabularia Iconic

1Tabularia

Tetracyclus Iconic

3Tetracyclus

Thalassiosira iconic

0Thalassionema

Tibetiella Iconic

0Tibetiella

Ulnaria Iconic 1

4Ulnaria

Ulnaria Iconic 1

4Ulnaria

Tibetiella Iconic

0Tibetiella

Thalassiosira iconic

0Thalassionema

Tetracyclus Iconic

3Tetracyclus

Tabularia Iconic

1Tabularia

Tabellaria Iconic

2Tabellaria

Synedra Iconic

4Synedra

Staurosirella Iconic Aac

6Staurosirella

Staurosira Iconic

4Staurosira

Stauroforma Iconic

1Stauroforma

Punctastriata Iconic  Aac

1Punctastriata

Staurosomething Iconic

0Pseudostaurosiropsis

Pseudostaurosira Iconic

8Pseudostaurosira

Oxyneis Iconic

2Oxyneis

Odontidium Iconic

2Odontidium

Neofragilaria iconic

0Neofragilaria

Nanofrustulum iconic

1Nanofrustulum

Meridion Iconic

5Meridion

Hannaea Iconic

2Hannaea

Grammatophora iconic

0Grammatophora

Fragilariforma Iconic

8Fragilariforma

Fragilaria

9Fragilaria

Distrionella Iconic

1Distrionella

Diprora Iconic

1Diprora

Diatoma Iconic

4Diatoma

Ctenophora Iconic

1Ctenophora

Asterionella Iconic2

2Asterionella

Ardissonea iconic

0Ardissonea

0Ardissonea
4Asterionella
2Ctenophora
7Diatoma
1Diprora
1Distrionella
45Fragilaria
14Fragilariforma
0Grammatophora
4Hannaea
5Meridion
1Nanofrustulum
0Neofragilaria
2Odontidium
2Oxyneis
16Pseudostaurosira
2Pseudostaurosiropsis
1Punctastriata
1Stauroforma
8Staurosira
17Staurosirella
19Synedra
6Tabellaria
3Tabularia
4Tetracyclus
0Thalassionema
0Tibetiella
16Ulnaria
16Ulnaria
0Tibetiella
0Thalassionema
4Tetracyclus
3Tabularia
6Tabellaria
19Synedra
17Staurosirella
8Staurosira
1Stauroforma
1Punctastriata
2Pseudostaurosiropsis
16Pseudostaurosira
2Oxyneis
2Odontidium
0Neofragilaria
1Nanofrustulum
5Meridion
4Hannaea
0Grammatophora
14Fragilariforma
45Fragilaria
1Distrionella
1Diprora
7Diatoma
2Ctenophora
4Asterionella
0Ardissonea

Diatoms of North America

The source for diatom identification and ecology

Cite as: Spaulding et al. 2021. Diatoms.org: supporting taxonomists, connecting communities. Diatom Research 36(4): 291-304. doi:10.1080/0269249X.2021.2006790

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