Dalhousie Springs hydrobiids 2 
Ponder et al., 1994). However, Dalhousia differs from these genera, and other hydrobiid genera, in 
the combination of characters listed in the diagnosis. Most similar to Fonscochlea, the new genus 
can be readily distinguished by its apomorphic single sperm sac and very elongate penis. When 
Superimposed on the cladogram produced by Ponder and Clark (1990) Dalhousia is the sister taxon 
to Fonscochlea. 
Dalhousia globosa n. sp. 
Figs 2H, 3, 6А,В, 7А,В, 8C, 9A, I0B-D,F, 11B, 12A,C, 13A, 14A,C, 16A,C,D, 22, 23, 24. 
Ponder, 1989, figs 11.1F, 11.2B,C,G. 
Etymology. Globosa — globus, globulus, Latin — ball, sphere. 
Type locality. Cal, the main spring (Earwanyera Spring), Dalhousie Springs, South Australia. 
Collection details of type material. Stn. С641В-С, Spring Cal, 26°24'29"S 135°31'08"E, on rocks & 
Wood from shallow water. 28/5/1983, Coll. W. Ponder & W. Zeidler. 
Holotype, SAM, D18937, paratypes, SAM, 18938, AMS, C.201743(C641B), C.201750(C641C). 
Diagnosis: Typically with large, globose shell. Distinguished electrophoretically from the next species 
ч having very high frequencies of the LAP 2, РОМ-2 3, SDH-1 1 and SDH-2 2 allozymes, and a 
igh frequency of the GPI 2 allozyme. 
Description: Shell (Fig. 2H, 3). Shell opaque, small (1.7—4.6 mm in length, mean in type series 4.1), 
roadly conical to globose, SW/SL 0.67-0.97 (overall mean 0.79, 0.77 in type series), AL/SL 0.46- 
-69 (mean 0.55), sutures impressed, whorls usually narrowly shouldered. Protoconch (Fig. 6A,B) of 
about 1.5-1.6 whorls, minutely punctate. Teleoconch of 2.8-4.2 (mean 3.3) strongly convex whorls, 
Sutures impressed; sculpture of indistinct growth lines. only. Aperture slightly longer than wide, AW/ 
AL 0.78-1.06 (mean 0.92, 0.94 in type series), angled posteriorly. Peristome with sharp edge, 
Moderately thickened internally, entire, with inner lip attached to parietal wall. Colour (imparted by 
Periostracum) pale yellow to yellow-brown. There is no significant sexual dimorphism in shell size 
1n the type population. 
Dimensions of holotype. 
" SL SW AL AW BW TW 
Olotype 4.16 3.35 2.36 2.06 3.45 3.2 
Dimensions of specimens from paratype series 
Female, N=13 
vie SL SW AL AW | BW CV TW 
Inimum 3.61 2.97 2.08 1.93 3.10 0.18 3.0 
àximum 4.52 3.52 2.42 2.23 3.61 0.26 4.2 
$ көні 4.11 3.20 2.21 2.08 3.43 0.23 3.3 
Za 0.25 0.18 0.11 0.10 0.16 0.02 0.34 
Male, N=7 
Min; SL SW AL AW BW CV TW 
‘mum 3.57 2.86 1.96 1.90 3.09 0.20 2.75 
o TU 4.61 3.30 2.43 2.17 3.73 0.25 3.50 
S et 4.09 3.09 2.19 2.04 3.42 0.23 3.21 
0.38 0.17 0.19 0.09 0.23 0.02 0.25 
Summarised shell dimensions of an additional 200 specimens from various points within Spring 
