The genera Cocconeis Ehrenberg and Amphicocconeis gen. nov.

2

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).

°°°°°°°°°°°°°°°°°°°°°°°°°

Cocconeis ornata Gregory : 2 rapheless valves

Length: 24-50 µm (40-55 µm)
Abundance : 4 / 39
Presence : G+
Lengths : 24, 42 µm
Widths : 16, 26,5 µm
8, 7 striae / 10 µm
Cocconeis ornata

Cocconeis pelta A. Schmidt : 1 frustule (?) and 2 rapheless valves

Length : 13-18,5 µm (18-20 µm)
Abundance : 10 / 39
Presence : G+
Lengths : 16, 13,5, 18,5 µm
Widths : 12, 10, 14 µm
13,5, 12, 12 striae / 10 µm
Cocconeis pelta

Cocconeis peltoides Hustedt : 3 rapheless valves

Length : 10-19 µm (7-18 µm)
Abundance : 23 / 39
Presence : G+, M+
Lengths : 10,5, 13,7, 18 µm
Widths : 6, 8,5, 13 µm
14, 16, 16 striae / 10 µm
Cocconeis peltoides

Cocconeis pinnata Gregory : 3 rapheless valves

Lengths : 19-30 µm (20-45 µm)
Abundance : 14 / 39
Presence : G+, M+
Lengths : 19, 27, 30 µm
Widths : 12, 17,5, 21 µm
6, 6, 5 striae / 10 µm
Cocconeis pinnata

Cocconeis multiperforata De Stefano : 1 raphe valve and  2 rapheless valves

Length : 32-66 µm (35-100 µm)
Abundance : 26 / 39
Presence : G+, M+
Lengths : 45, 45, 66 µm
Widths : 34, 34, 54 µm
Raphe valve : 20 striae / 10 µm.     Rapheless valves : 17, 15 striae / 10 µm.
Cocconeis pseudomarginata


Cocconeis pseudomarginata Gregory : 2 raphe valves and 2 rapheless valves

Length : 10-27,5 µm (35-100 µm)
Abundance : 12 / 39
Presence : G+, M+
Lengths : 18, 27,5, 17,6, 22 µm
Widths : 12, 20,5, 10,8, 15 µm
Raphe valves : 25, 23 striaes / 10 µm
Cocconeis pseudomarg


Cocconeis scutellum Ehrenberg var. scutellum : 1 raphe valve and 1 rapheless valve

Length : 25-36 µm (20-60 µm)
Abundance : 5 / 39
Presence : G+
Lengths : 36, 26 µm
Widths : 26, 17 µm
7, 8,5 striae / 10 µm
Cocconeis scutellum

Cocconeis scutellum var. obliqua Brun (?) : 1 rapheless valve

Length : 21 µm (20-60 µm)
Abundance : 1 / 39
Presence : G+
Length : 21 µm
Width : 14 µm
9 striae / 10 µm
Cocconeis scutellum obliqua

Cocconeis scutellum var. parva Grunow : 2 raphe valves and 1 rapheless valve

Length : 11-29 µm (20-30 µm)
Abundance : 30 / 39
Presence : G+, M+
Lengths : 24, 29, 21 µm
Widths : 18, 22, 18 µm
Raphe valves : 14, 12-13 striae / 10 µm.    Rapheless valve : 13-14 striae / 10 µm.
Cocconeis scutellum parva

Cocconeis scutellum var. minutissima Grunow : 3 rapheless valves (?)

Length : 8-15 µm (environ 10 µm)
Abundance : 23 / 39
Presence : G+, M+
Lengths : 10,8, 13, 15 µm
Widths : 7,4, 8,5, 9 µm
17, 18, 16,5 striae / 10 µm
Cocconeis scutellum minutissima

Cocconeis speciosa Gregory : 2 rapheless valves

Length : 11-32 µm (9-32 µm)
Abundance : 9 / 39
Presence : G+, M+
Lengths : 27, 28,5 µm
Widths : 21, 20 µm
9,  9 striae / 10 µm
Cocconeis speciosa

Cocconeis speciosa Gregory var. obliqua : 1 rapheless valve

Length :14-27 µm (- µm)
Abundance : 3 / 39
Presence : G+
Length : 25 µm
Width : 18 µm
9 striae / 10 µm
Cocconeis speciosa obliqua

Cocconeis stauroneiformis (W. Smith) Okuno : 2 raphe valves (?) and 1 rapheless valve

Length: 12-28 µm (20-60 µm)
Abundance : 19 / 39
Presence : G+, M+
Lengths : 23, 23, 28 µm
Widths : 12, 14, 14,5 µm
12, 10-11, 10-11 striae / 10 µm
Cocconeis stauroneiformis
Retour Cocconeis/Amphicocconeis
Return to Cocconeis/Amphicocconeis