Koolan Island Zoological notes 
Table 1 Location and habitat of the sites that were systematically sampled for earthworms (see Figure 1). 
Site 
Location (°S, °E) 
Geology' 
Habitat 
No. specimens 
VI 
16°07'00", 123°46'50" 
Pky 
vine thicket 
9 
V2 
16°08T5", 123°46'40" 
Pky 
vine thicket 
4 
SI 
16°08'50", 123°46'45" 
Pky 
savanna woodland 
0 
S2 
16°08'40”, 123 o 46'50” 
Pky 
savanna woodland 
1 
T1 
16°08'00”, 123°46'45" 
Pky 
swampy creek 
0 
T2 
16°08'10", 123°46'45" 
Pky 
town gardens 
20+ 
a Pky = Yampi Formation, comprising quartz, hematitic and feldspathic sandstone, siltstone and quartz conglomerate 
that, on Koolan Island, lies unconformably over Elgee Siltstone (Pke) (Tyler and Griffin 1993). 
savanna woodlands, N.McK. dug more than 50 
shallow potholes in valley floors, slopes and 
uplands north of the "old tip" (Figure 1) during 
our last two days on the island; no earthworms 
were found. The results of the formal, quadrat- 
based earthworm survey are summarised in Tables 
1 and 2. 
Land Snails 
Subulinidae 
Eremopeas interioris (Tate). Two dead shells were 
found under sandstone rocks in vine thicket V2 
in February 1993 (see Table 1). 
Helicarionidae 
Westralcystis lissus (E.A. Smith). Two dead shells 
were found under sandstone rocks in vine 
thicket V2 (Feb. 1993). 
Camaenidae 
Torresitrachia bathurstensis (E.A. Smith). One dead 
juvenile was taken from soil on the bottom of a 
concrete culvert under the road near the 
workshop complex (Feb. 1993). Six dead shells 
were found under sandstone rocks in vine 
thicket V2 (Feb. 1993). 
Amplirhagada astuta (Iredale). The holotype (AM 
C.64857) was collected on Koolan Island. D. 
Milton sent additional specimens to the W.A. 
Museum in August 1966. On 14 February 1993, 
two were found crossing path in town after 
heavy rain. This species is endemic to Koolan. 
Setobaudinia sp. (new species, fide V. Kessner). Two 
(live) were found under sandstone rocks in vine 
thicket V2 (Feb. 1993). 
Kimboraga yampensis Solem. The type locality is a 
house garden on Koolan Island (WAM 604.80). 
The original specimens were collected in July 
1967 by J. Milton and J. Bannister. In February 
1993, one dead shell was found on the patio of a 
house in town, and a live specimen was taken 
from a pile of sandstone rocks in vine thicket 
V2. 
Kimboraga koolanensis (Iredale). Known only from 
four very worn and bleached specimens from 
Koolan Island held by American museums 
(Holotype: AM C.64873, Koolan Island). The 
Table 2 Occurrence of earthworms on Koolan Island. 
Site 
Density (m' 2 ) 
Abundance' Occurrence b 
Biomass (g m‘ 2 ) 
Species recorded 
VI 
52.5+/-20.6 
9.5+/-6.5 
Vine Thickets 
3/4 
Diplotrema sp. "koolan2" 
V2 
18.2+/-10.6 
5.1+/-3.2 
2/4 
Diplotrema sp. "koolanl" 
Total: 
35.4+/-12.5 
7.3+/-3.5 
5/8 
SI 
0 
Savanna Woodlands 
0 0/5 
None found 
S2 
5.0+/-5.0 
1.0+/-1.0 
1/4 
Diplotrema sp. c 
Total: 
2.2+/-2.2 
0.4+/-0.4 
IB 
T1 
0 
0 
Creek 
0/3 
None found 
T2 
22.5+/-14.9 
1.2+/-0.8 
Town Gardens 
2/8 
Dichogaster bolaui 
* Mean +/- standard error (number of quadrats sampled). 
b Number of quadrats with worms / number of quadrats sampled. 
c Too sexually immature to be placed taxonomically. 
