The genera Cocconeis Ehrenberg and Amphicocconeis gen. nov.
3
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 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).
°°°°°°°°°°°°°°°°°°°°°°°°°
Cocconeis sp. 1 : 2 raphe valves, 2 rapheless valves
Length : 20-31 µm
Abundance : 1 / 39
Presence : G+
Abundance : 1 / 39
Presence : G+
Lengths raphe valves : 31, 20 µm. Rapheless valves : 20, 23,5 µm
Widths raphe valves : 22, 12,3 µm. Rapheless valves : 12,3, 15 µm
Raphe valves : 20, 21 striaes / 10 µm.
Widths raphe valves : 22, 12,3 µm. Rapheless valves : 12,3, 15 µm
Raphe valves : 20, 21 striaes / 10 µm.
Cocconeis sp. 2 (=? Anorthoneis sp.) : 3 rapheless valves
Length : 23-27 µm
Abundance : 4 / 39
Presence : G+
Abundance : 4 / 39
Presence : G+
Lengths : 23, 24, 24 µm
Widths : 20, 19, 20 µm
About 8-9 striae / 10 µm
Widths : 20, 19, 20 µm
About 8-9 striae / 10 µm
Cocconeis sp. 3 A (cf. peltoides Hustedt) : 4 rapheless valves
Length : 12,5-19 µm
Abundance : 8 / 39
Presence : G+, M+
Abundance : 8 / 39
Presence : G+, M+
Lengths : 12,5, 13, 14, 19 µm
Widths : 8,5, 10, 10,5, 10,8 µm
12, 11, 13, 10 striae / 10 µm
Widths : 8,5, 10, 10,5, 10,8 µm
12, 11, 13, 10 striae / 10 µm
Cocconeis sp. 3 B (cf. peltoides Hustedt) : 2 rapheless valves
Length : 9-11 µm
Abundance : 5 / 39
Presence : G+, M+
Abundance : 5 / 39
Presence : G+, M+
Lengths : 9,2, 11 µm
Widthrs : 6,5, 9 µm
13, 11 striae / 10 µm
Widthrs : 6,5, 9 µm
13, 11 striae / 10 µm
Cocconeis sp. 4 A : 6 rapheless valves
Length : 7-12,5 µm
Abundance : 8 / 39
Presence : G+
Abundance : 8 / 39
Presence : G+
Lengths : 7, 10,6, 10,7, 11, 11, 12,5 µm
Widths : 4,5, 7, 6,2, 7, 6,8, 7,8 µm
24, 21, 22, 20, 22, 20 striae / 10 µm
Widths : 4,5, 7, 6,2, 7, 6,8, 7,8 µm
24, 21, 22, 20, 22, 20 striae / 10 µm
Cocconeis sp. 4 C : 1 raphe valve, 2 rapheless valves
Length : 9-11 µm
Abundance : 4 / 39
Presence : G+
Abundance : 4 / 39
Presence : G+
Lengths : 7, 9,5, 10,5 µm
Widths : 6,5, 6, 6,2 µm
28, 27, 28 striae / 10 µm
Widths : 6,5, 6, 6,2 µm
28, 27, 28 striae / 10 µm
Cocconeis sp. 5 : 4 rapheless valves
Length : 16,5-37 µm
Abundance : 3 / 39
Presence : G+
Abundance : 3 / 39
Presence : G+
Lengths : 18, 19,7, 23, 37 µm
Widths : 10,5, 12,8, 14, 21 µm
13, 14, 14, 11 striae / 10 µm
Widths : 10,5, 12,8, 14, 21 µm
13, 14, 14, 11 striae / 10 µm
Cocconeis sp. 6 : 1 rapheless valve
Length : 15 µm
Abundance : 1 / 39
Presence : G+
Abundance : 1 / 39
Presence : G+
Length : 15 µm
Width : 10,5 µm
About 16 striae / 10 µm
Width : 10,5 µm
About 16 striae / 10 µm
Cocconeis sp. 7 : 2 rapheless valves
Length : 13-16 µm
Abundance : 2 / 39
Presence : G+
Abundance : 2 / 39
Presence : G+
Lengths : 13,5, 15,5 µm
Widths : 8,8, 10,5 µm
13-14, 14 striae / 10 µm
Widths : 8,8, 10,5 µm
13-14, 14 striae / 10 µm
Cocconeis sp. 8 :1 raphe valve, 1 frustule, 2 rapheless valves
Length : 15-22 µm
Abundance : 10 / 39
Presence : G+
Abundance : 10 / 39
Presence : G+
Lengths : 15, 20, 21, 22 µm
Widths : 10, 13,5, 15, 14,5 µm
Raphe valve : 15-16 striae / 10 µm. Frustule and rapheless valves : 15 to18, 15 to 18, 15 to 18 striae / 10 µm
Widths : 10, 13,5, 15, 14,5 µm
Raphe valve : 15-16 striae / 10 µm. Frustule and rapheless valves : 15 to18, 15 to 18, 15 to 18 striae / 10 µm