S.No Bacillariophyceae (Diatoms) St-1 St-2 St-3
1 Asterionella glacialis * * +
2 Bacillaria paradox * + +
3 Bacteriastrum comosum * + +
4 Bacteriastrum delicatilum + + +
5 Bacteriastrum hylinium + + +
6 Bellerochea malleus * + +
7 Biddulphia biddulpia + * +
8 Biddulphia heteroceros + + *
9 Biddulphia obtuse * * +
10 Biddulphia pulchella + + +
11 Biddulphia reticulata * + +
12 Biddulphia sp. + + +
13 Chaetoceros affinis + + +
14 Chaetoceros brevis + + +
15 Chaetoceros coarctatus * + +
16 Chaetoceros currivisetes + * +
17 Chaetoceros danicus * + +
18 Chaetoceros deblis + * *
19 Chaetoceros decipiens * + +
20 Chaetoceros diversus + * +
21 Chaetoceros indicus * + +
22 Chaetoceros messanensis + * +
23 Chaetoceros peruvian + * +
24 Climocodium fraunfeldium * * +
25 Coscinodiscus centralis + + +
26 Coscinodiscus concinnus * + +
27 Coscinodiscus ecentricus * + +
28 Coscinodiscus gigas + + +
29 Coscinodiscus granii * + +
30 Coscinodiscus radiatus + * +
31 Coscinodiscus thori + + +
32 Cyclotella sp. + + +
33 Cyclotella striata * + +
34 Diatoma anceps + + +
35 Ditylum brightwelli * + +
36 Eucambia groenlandica * + +
37 Eucambia zoodiocus + + +
38 Fragillaria sp. + + +
39 Guinordia sp. + + +
40 Gyrosigma sp. + + +
41 Hemiaulus sinensis * + +
42 Hemidiscus hardmanianus * * +
43 Lauderia sp. + + +
44 Leptocylindrus danicus + + +
45 Lithodesmium undulatum * + +
46 Navicula henneydii * + +
47 Navicula sp. + + +
48 Navicula venhoffeni * + +
49 Nitzschia closterium + + +
50 Nitzschia longissima * + +
51 Nitzschia pungens + + +
52 Nitzschia seriata + + +
53 Nitzschia sp. + + +
54 Odentella mobiliensis + + +
55 Odentella sinensis * + +
56 Planktoniella sol + + +
57 Pleurosigma angulatum + + +
58 Pleurosigma depressum + + +
59 Pleurosigma directum * * +
60 Pleurosigma elongatum + + +
61 Pleurosigma normanii * * +
62 Rhizosolenia alata + * *
63 Rhizosolenia cylindrus + + +
64 Rhizosolenia imbricata * + +
65 Rhizosolenia robusta + + +
66 Rhizosolenia setigera * + +
67 Rhizosolenia styliformis + + +
68 Skeletonema costatum + + +
69 Stephanophysis palmariana * + *
70 Streptothaeca indicus * + *
71 Thalassionema nitzschioides + + +
72 Thalassiosira sp. + + +
73 Thalassiothrix fraunfeldii * * +
74 Triceratium favus * + +
75 Triceratium reticulatum + + +
76 Triceratium robertsianum + + *
  Dinophyceae      
1 Ceratium extensum + + +
2 Ceratium furca + + +
3 Ceratium fusus * * +
4 Ceratium inflatum + + +
5 Ceratium lineatum * + +
6 Ceratium macroceros * + +
7 Ceratium trichoceros * + +
8 Ceratium tripos * * +
9 Ceratocorys horrida + * *
10 Dinophysis caudata * + +
11 Noctiluca sp + + +
12 Ornithocercus steinii + * *
13 Prorocentrum micans * * +
14 Protoperidinium depressum + + +
15 Protoperidinium oceanicum + + +
16 Protoperidinium sp. + + +
17 Pyrophacus stenii * + +
  Cyanophyceae (Blue-greens)      
1 Anabena sp + + +
2 Trichodesmium erythraea * + +
3 Spirulina major * * +
4 Lyngbya sp. + + *
5 Oscillatoria limosa * * +
  Chlorophyceae (Greens)      
1 Volvox sp. + + +
2 Pediastrum simplex * * +
  Chrysophyceae (Silicoflagellate)      
1 Dichtyocha fibula * + +
  Total 56 76 91
(+ present &* absent)
Table 1: Study period recorded phytoplankton species from Muthupettai region.