SYNOPSIS OF THE FAUNA

The following table gives numbers of species and genera, by family, of endemic, indigenous (occurring naturally in Samoa but also elsewhere) and artificially introduced (or possibly introduced) species. The column headed "?" includes species not known for certain to occur in Samoa. Habitat is listed as freshwater (including brackish-water) (fw.) or terrestrial (terr.).

Family

Habitat

Species (genera)

Endemic

Indigenous

?

Introduced

Total

Neritidae

fw.

—

23 (5)

3 (2)

—

26 (5)

Helicinidae1

terr.

8 (2)

4 (2)

2 (2)

—

14 (3)

Neocyclotidae

terr.

12 (1)

—

—

—

12 (1)

Diplommatinidae

terr.

1 (1)

—

—

—

1 (1)

Truncatellidae

terr.

—

1 (1)

—

—

1 (1)

Assimineidae

terr.

3 (3)2

7 (2)

2 (1)

—

12 (3)

Thiaridae3

fw.

3 (2)

11 (2)

1 (1)

1 (1)

16 (2)

Veronicellidae

terr.

—

—

—

2 (2)

2 (2)

Ellobiidae

terr.

1 (1)2

16 (6)

1 (1)

—

18 (6)

Physidae

fw.

—

—

—

1 (1)

1 (1)

Planorbidae

fw.

—

—

—

2 (2)4

2 (2)

Ancylidae

fw.

—

—

—

1 (1)

1 (1)

Achatinellidae

terr.

—

—

1(1)

3(2)

4 (3)

Pupillidae

terr.

1 (1)

—

2 (2)

1(1)

4 (3)

Partulidae

terr.

8 (2)

—

2 (1)

—

10 (2)

Subulinidae

terr.

—

—

—

5 (4)

5 (4)

Achatinidae

terr.

—

—

—

1 (1)

1 (1)

Spiraxidae

terr.

—

—

—

1 (1)

1 (1)

Streptaxidae

terr.

—

—

—

3 (3)

3 (3)

Rhytididae

terr.

—

1 (1)

—

—

1 (1)

Endodontidae

terr.

2 (2)

—

—

—

2 (2)

Charopidae

terr.

8 (2)

1(1)

—

—

9 (3)

Succineidae

terr.

3 (1)

1 (1)

—

—

4 (1)

Helicarionidae

terr.

6 (3)

4 (3)

3 (1)2

—

13 (4)

Ariophantidae

terr.

—

—

—

1 (1)

1 (1)

Zonitidae

terr.

5 (1)

—

1 (1)

—

6 (1)

Bradybaenidae

terr.

—

—

—

1 (1)

1 (1)

Incertae sedis

terr.

1 (1)

—

—

—

1 (1)

Totals

62 (23)

69 (24)

18 (13)

23 (21)

172 (60)

1 Five Helicinidae are of unknown genus; four of them are included as endemics, one as "?".
2 Includes a single, nomenclaturally valid species of unknown genus.
3 Many of these species could be considered artificially introduced.
4 Unidentified Planorbis spp. counted as one species.