74 МЕ. Ponder, D.J. Colgan, Т. Terzis, S.A. Clark, А.С. Miller 
1mm 
D E F 
Figure 18. Shells of Fluvidona centralia. A. Spring Gal (station D13), B. Spring Ga2 (station D5), C. Spring F9 
(station D53), D. Spring ЕЗ (station D23A), E. Spring Cd11 (station D70; paratype), F. Spring Ga6A 
(station D15). 
large springs is also difficult because of the dense vegetation and the snails, in this type of habitat, 
are usually very infrequent. Shell variation between populations is shown in Fig. 18. 
The genus Jardinella (see Ponder and Clark, 1990) found in artesian springs in western Queensland, 
as well as in some coastal rivers in north Queensland (Ponder, 1991) is similar to Fluvidona in 
having a small seminal receptacle and large bursa copulatrix but differs in having, like Dalhousia 
and Fonscochlea, only two pairs of basal denticles on the central radular teeth and weak opercular 
pegs. 
The new species represents a major range extension for Fluvidona, a predominantly south eastern 
Australian group, although undescribed taxa are known from the Flinders Ranges, as well as more 
coastal areas in South Australia. As noted above, the new species differs from any of the named taxa 
