Dunkirk Diatoms SEM Images by Mary Ann Tiffany

Alphabetical Species List with Links to the Images
Compiled by David Walker, Editor of Micscape Magazine

Names were assigned by Dick Carter in his Observations. To read the notes on a link, scroll down to the relevant row in the Observations.

Uncertainties in assignments are indicated with question marks or comments. Different species in a genus are numbered when a species name could not be determined. Repeat entries indicate a different specimen with the same name.
Name Links to Rows and Columns in the Image Gallery
Actinocyclus 76.4 76.5 77.1 77.2 77.3  
Actinocyclus another sp.? 55.4          
Actinocyclus octonarius Ehrenberg 55.3          
Actinocyclus possibly A. octonarius Ehrenberg 74.3 74.4        
Actinoptychus heliopelta Grunow 57.1          
Actinoptychus heliopelta Grunow 76.3          
Actinoptychus heliopelta Grunow 69.3          
Actinoptychus heliopelta Grunow 65.4 65.5        
Actinoptychus heliopelta Grunow 79.4          
Araniscus lewisianus (Greville) Komura 12.3 12.4        
Araniscus lewisianus (Greville) Komura /
Coscinodiscus lewisianus Greville		 8.5 13.2        
Asterolampra marylandica Ehrenberg 59.4          
Aulacodiscus 4.1 4.2 4.3 4.4    
Aulacodiscus 1 12.5 17.5 - 18.1 18.5      
Aulacodiscus 1 93.3 - 93.5 93.5        
Aulacodiscus 2 97.1          
Aulacodiscus 2 94.2 94.3 94.4      
Aulacodiscus probably A. sollitianus Norman same sp. as 6.1-6.2 80.4 - 82.1 6.4-8.1, 13.5-16.4 37.1-38.1    
Aulacodiscus another species 35.2 35.3 35.4 35.5 36.1 36.2 36.3 36.4 36.5 40.4 40.5 41.1 41.2 41.4 41.5
Aulacodiscus rogersii (Ehrenberg) Schmidt 51.5          
Aulacodiscus rogersii (Ehrenberg) Schmidt 72.1          
Aulacodiscus rogersii (Ehrenberg) Schmidt 44.1 - 44.5          
Aulacodiscus rogersii (Ehrenberg) Schmidt 46.2 46.3 46.4 46.5 47.1 47.2  
Aulacodiscus rogersii (Ehrenberg) Schmidt 58.1 - 59.3           
Aulacodiscus rogersii (Ehrenberg) Schmidt 66.1 - 66.7          
Aulacodiscus rogersii (Ehrenberg) Schmidt 54.1          
Aulacodiscus same species as 80.4. Probably A. sollitianus Norman 85.1 - 86.4 86.4        
Aulacodiscus sollitianus Norman 37.1 37.2 37.3 37.4 37.5 38.1
Aulacodiscus sollitianus Norman ? 13.5 14.1 14.2 14.3 14.4 14.5 15.1 15.2 - 16.4
Aulacodiscus sollitianus Norman. 7.1 7.2 7.3 7.4 7.5  
Aulacodiscus sollitianus Norman. 6.1 6.2 6.4 6.5 8.1  
Biddulphia suborbicularis Grunow 47.3 47.4 48.1 48.2 48.3 48.4
Biddulphia suborbicularis Grunow 61.3          
Biddulphia tridens (Ehrenberg) Ehrenberg 52.5 53.1        
Biddulphia or Trigonium species 34.4 34.5        
Chaetoceros different sp. 87.3          
Chaetoceros resting spore 3.3 3.4 3.5 13.3 13.4 88.1
Chaetoceros pliocenum Brun 27.2          
Chaetoceros pliocenum Brun another specimen 32.5          
Coscinodiscus 60.3 - 60.5          
Coscinodiscus 49.3 49.4 49.5 - 50.1 50.2 50.3  
Coscinodiscus 23.5 24.1 38.2      
Coscinodiscus another sp. 56.1          
Coscinodiscus bulliens Schmidt 72.4 - 73.1          
Coscinodiscus bulliens Schmidt 22.5 23.1 23.2      
Coscinodiscus? 55.5          
Coscinodiscus? 78.3 78.4 78.5      
Coscinodiscus? 75.4          
Coscinodiscus? 83.4 83.4        
Coscinodiscus or Actinocyclus species 64.3 64.4 64.5      
Craspedodiscus coscinodiscus (Ehrenberg) Ehrenberg 45.2 45.3 45.4 45.5 46.1  
Craspedodiscus coscinodiscus (Ehrenberg) Ehrenberg 38.3 38.4 39.1 39.2 39.3 39.4 40.1 40.2 40.3
Craspedodiscus elegans Ehrenberg another specimen 84.1 84.2 84.3 84.4 84.5  
Craspedodiscus elegans Ehrenberg 50.4 50.5 51.1      
Craspedodiscus elegans Ehrenberg 67.3 67.4-69.1        
Craspedodiscus elegans Ehrenberg 57.2 - 57.5          
Craspedodiscus elegans Ehrenberg 69.5 - 71.5          
Diploneis 9.1 9.2        
Diploneis different species 33.4          
Distephanus silicoflagellate 62.4          
Dossetia hyalina Andrews resting spore? 90.3          
Dossetia hyalina Andrews resting spore? 49.2          
Dossetia or Xanthiopyxis resting spore 83.2          
Endictya resembles 1.1 1.2 1.3 1.4 1.5 30.4 31.4
Endictya resembles 21.5 22.1        
Endictya resembles 88.5 - 89.3 89.4 - 90.2         
Flexibiddulphia semicirculare (Brightwell) Simonsen 24.2 24.3 24.4 24.5 25.1 - 26.33  
Flexibiddulphia semicirculare (Brightwell) Simonsen 2.1 2.2 2.3 2.4    
Flexibiddulphia semicirculare (Brightwell) Simonsen 9.5 10.1 10.2 10.3 10.4 10.5 11.1-4
Flexibiddulphia semicirculare (Brightwell) Simonsen further views 28.5 - 29.5          
Goniothecium 61.1 - 61.2          
Goniothecium odontella Ehrenberg 72.2 72.3        
Goniothecium odontella Ehrenberg 65.3          
Goniothecium odontella Ehrenberg 63.2 63.3 63.4 63.5    
Gyrosigma 16.5 17.1 17.2 17.3    
Gyrosigma additional views of 16.5 30.5 31.1 31.2      
Lithodesmium ehrenbergii (Grunow) Forti 2.5 3.1 3.2      
Lithodesmium ehrenbergii (Grunow) Forti 20.1 - 20.3          
Lithodesmium undulatum Ehrenberg 91.4  - 92.1          
Lithodesmium undulatum Ehrenberg 34.1 34.2 34.3      
Lyrella another species 28.2 28.3 28.4      
Lyrella lyra (Ehrenberg) Karajeva 27.3          
Lyrella spectabilis (Gregory) D. Mann? 19.1 - 19.3          
Mastogonia crux Ehrenberg 77.4 77.5 78.1        
Mastogonia crux Ehrenberg 56.2 - 56.5          
Mastogonia crux Ehrenberg 73.4          
Mesocena quadrangula Ehrenberg silicoflagellate 48.5          
Naviculopsis quadrata (Ehrenberg) Ling 23.4          
Naviculopsis quadrata (Ehrenberg) Ling silicoflagellate 12.2          
Odontella weissflogii (Grunow) Grunow 54.4 54.5        
Odontella weissflogii (Grunow) Grunow 33.2 33.3        
P. sulcata (Ehrenberg) Cleve 23.3          
Paralia species, probably P. sulcata (Ehrenberg) Cleve 64.2          
Paralia sulcata (Ehrenberg) Cleve 75.5  - 76.2          
Paralia sulcata (Ehrenberg) Cleve 78.2          
Pleurosigma 47.5          
Pleurosigma affine var. marylandica Grunow 52.1 52.2 52.3 52.4    
Pleurosigma, presumably P. affine var. marylandica Grunow 82.4            
Pseudauliscus radiatus (Bailey) Schmidt 21.1 21.2 21.3 21.4    
Pseudopyxilla americana (Ehrenberg) Forti? 53.2 53.3        
Pseudopyxilla cf. americana (Ehrenberg) Fort 82.5 83.1 83.3      
Pseudopyxilla cf. americana (Ehrenberg) Fort 86.5          
Pseudopyxilla cf. americana (Ehrenberg) Forti 5.1          
Pseudopyxilla cf. americana (Ehrenberg) Forti 43.2 43.3        
Pseudopyxilla cf. americana (Ehrenberg) Forti 87.5          
Sceptroneis caduceus Ehrenberg 59.5 60.1 60.2      
Sceptroneis caduceus Ehrenberg 65.1 65.2        
Sceptroneis caduceus Ehrenberg 62.2 62.3        
Semantebria? 94.1          
Semantebria frenguelli? 20.4 20.5        
Spore resting 6.3 8.2 8.3      
Stellarima stellaris (Roper) Hasle & Sims 95.1 95.2 95.3 95.4    
Stephanogonia 27.1          
Stephanogonia not S. actinoptychus 32.4 38.5 39.5      
Stephanogonia actinoptychus (Ehrenberg) Grunow 19.5          
Stephanogonia actinoptychus (Ehrenberg) Grunow 53.4          
Stephanogonia actinoptychus (Ehrenberg) Grunow 4.5 8.4        
Stephanogonia actinoptychus (Ehrenberg) Grunow 42.4          
Stephanonycites coronus (Ehrenberg) Komura 73.3          
Stephanonycites coronus (Ehrenberg) Komura 45.1          
Stephanonycites coronus (Ehrenberg) Komura? 63.1          
Stephanopyxis 54.3          
Stephanopyxis 9.4          
Stephanopyxis  possibly S. turris (Greville) Ralfs 64.1          
Stephanopyxis, possibly S. turris (Greville) Ralfs 41.3          
Stephanopyxis diadema Ehrenberg 74.5 75.1-75.2 75.3      
Stephanopyxis diadema Ehrenberg 69.4          
Stephanopyxis diadema Ehrenberg 79.2 79.3        
Stephanopyxis lineata (Ehrenberg) Forti 79.1          
Stephanopyxis lineata (Ehrenberg) Forti 49.1          
Stephanopyxis lineata (Ehrenberg) Forti 54.2          
Stephanopyxis turris (Greville) Ralfs? 73.2          
Stephanopyxis turris (Greville) Ralfs 74.2          
Thalassionema nitzschioides (Grunow) Mereschkowsky 61.4          
Triceratium 30.1 30.2 30.3      
Triceratium 88.3          
Triceratium condecorum Ehrenberg 69.2          
Triceratium condecorum Ehrenberg 22.2 22.3 22.4      
Triceratium condecorum Ehrenberg 87.1          
Triceratium condecorum Ehrenberg 73.5 74.1        
Triceratium condecorum Ehrenberg, below it Triceratium condecorum Ehrenberg 31.3          
Triceratium kainii Schultze 31.5 32.1 32.2 32.3    
Triceratium robustum Greville 79.5 80.1 80.2 80.3    
Unknown 5.2 27.4 27.5 28.1    
Unknown 1 5.2 5.3 5.4 5.5    
Unknown 1 same species 90.5 - 91.3          
Unknown 2 stack of valves 94.5 95.5 96.2      
Xanthiopyxis 19.4          
Xanthiopyxis 17.4          
Xanthiopyxis 88.4          
Xanthiopyxis 11.5          
Xanthiopyxis 9.3 12.1        
Xanthiopyxis 87.4          
Xanthiopyxis A panduriform sp. of the form-genus 87.2          
Xanthiopyxis lenticular sp. 43.5          
Xanthiopyxis lenticular sp.? 53.5          
Xanthiopyxis ovoid sp. 43.4          

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First published on the Microscopy-UK website in the
February 2023 issue of Micscape magazine.

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