The genera Cocconeis Ehrenberg and Amphicocconeis gen. nov.

4

For each taxus, are indicated :
- The lower and the higher observed lengths and in parentheses those indicated in the diagnoses.
- The abundance in the investigated area, expressed by the number of samples where the taxus was observed.
- The presence around the Ile de Groix (G+)  and around the Ile aux moutons (M+).
- The characteristics of the presented valves/frustules (from left to right).

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Cocconeis sp. (cf. californica Grunow in van Heurck) : 2 rapheless valves

Length : 18-20 µm (12-32 µm)
Abundance : 2 / 39
Presence : G+
Lengths : 18,2, 19,5 µm
Widths : 13, 12,5 µm
18-19, 15-17 striae / 10 µm
Cocconeis calif

Cocconeis sp. 9 (cf. guttata Hustedt in Aleem & Hustedt) : 3 rapheless valves

Length : 12-17 µm 
Abundance : 7 / 39
Presence : G+, M+
Lengths : 13, 13,7, 14 µm
Widths : 8,5, 8, 9,4 µm
12, 13, 13 striae / 10 µm
Cocconeis neuf

Cocconeis sp. (cf. Amphicocconeis disculoides (Hustedt) comb. nov.) : 4 rapheless valves

Length : 14-33 µm (18-30 µm)
Abundance : 4 / 39
Presence : G+
Lengths : 14, 16,5, 25,5, 33 µm
Widths : 7, 8,5, 11,5, 17,5 µm
13, 12-13, 12, 11 striae / 10 µm
Cocconeis douze

Cocconeis sp. 13: 1 rapheless valve

Length : 18 µm 
Abundance : 1 / 39
Presence : G+
Length : 18 µm
Width : 12 µm
12 striae / 10 µm
Cocconeis treize

Cocconeis sp. 14 : 1 rapheless valve

Length : 27 µm 
Abundance : 1 / 39
Presence : G+
Length : 27 µm
Width : 21 µm
Cocconeis quatorze

Cocconeis sp. 22 : 2 rapheless valves

Length : 15-19 µm 
Abundance : 2 / 39
Presence : G+
Lengths : 15, 19 µm
Widths : 11,5, 13,5 µm
15, 13 striae / 10 µm
Coconeis vingt deux

Cocconeis sp. 24 (cf. pelta (?) A. Schmidt) : 1 rapheless valve

Length : 18 µm 
Abundance : 1 / 39
Presence : G+
Length : 18 µm
Widthr : 8,8 µm
21-22 striae / 10 µm
Cocconeis vingt quatre

Cocconeis sp. (cf. heteroida Hantzsch) : 3 frustules and 1 rapheless valve

Length : 30-41 µm (20-70 µm)
Abundance : 4 / 39
Presence : G+
Lengths : 18, 30, 33, 39 µm
Widths : 10,7, 19, 22, 27 µm
24, 21, 21, - striae / 10 µm
Cocconeis heteroidea

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