Family Name

Species Name

Tinib (muddy sand)

Esteves (sandy mud)

n

n (n − 1)

N

n (n − 1)

Columbellidae

Sp 1

0

0

13

156

Littorinadae

Littoraria scabra

41

1640

70

4830

Melongenidae

Volema myristica

12

132

33

1056

Muricidae

Cronia margariticola

0

0

148

21,756

Neritidae

Nerita planospera

8

56

9

72

Nerita chameleon

0

0

190

35,910

Nerita polita

0

0

2

2

Potamididae

Cerithidea cingulata

4985

24,845,240

5800

33,634,200

Terebralia sulcata

91

8190

0

0

Terebralia palustris

0

0

14,941

223,218,540

Trochidae

Monodontia labio

4

12

3

6

Turbinidae

Turbo cinereus

0

0

1

0

∑n(n − 1)

24,855,270

256,916,528

Total (N)

5141

21,210

Species Diversity (Ds)

0.06

0.43