352 
H. Smit 
crossing with North West Coastal Highway, 18 
August 1994. 
Remarks 
According to Cook (1986) L. solida and L. 
parasolida differ in the number of stiff swimming 
setae on IV-leg-5 ( solida with two setae and 
parasolida with one). However, the number of stiff 
setae on IV-leg-5 varies in both species from 1-2, 
and can therefore not be used to separate the two 
species. The two species are easily separated by the 
platelet on the dorsum, which is larger and more 
rounded in L. parasolida (Figure 1), and the distance 
between the Glandula Limnesiae and the 
associated seta (large in parasolida, short in solida). 
In contradiction to Smit (1992), the male does has a 
platelet on the dorsal shield (Figure 5), 68-86 long. 
Males of L. parasolida have the gonopore as long as 
the genital field, in L. solida the gonopore is 
distinctly shorter than the genital field. 
The seta associated with coxoglandularia 2 of L. 
solida are not always closer to the genital field (as 
stated by Cook), but occasionally halfway between 
the genital field and the coxoglandularia 2. Males 
of solida sometimes show some secondary 
sclerotization posterior of the genital field and 
fourth coxal plates. Males of this study are 737-941 
in length, the long seta of IV-leg-6 measured 62-98 
in length. Females measured 902-1260 in length. 
The nymphs of the two species can be separated 
with the platelet on the dorsal shield, which is 17- 
33 long in L. solida and 48-70 in L. parasolida. 
Distribution 
A widespread species in Australia, previously 
reported from Victoria (only one record, the 
holotype) and Queensland (K.O. Viets, 1975; Smit, 
1992). The species is much more common in the 
Northern Territory and Western Australia 
compared to Queensland and Victoria. So far, no 
records are known from the southwestern part of 
Western Australia. 
Genus Physolimnesia Halik 
Centrolimnesia (Physolimnesia) Halik, 1940: 21. 
Physolimnesia Halik: Lundblad, 1941b: 365. 
Physolimnesia katherine sp. nov. 
Figures 6-10 
Material Examined 
Holotype 
8 , Southern Rockhole, Katherine Gorge National 
Park, Northern Territory, Australia, 27 July 1994 
(NTM). 
Paratypes 
3 8,22 (NTM), 2 8,2 2 (WAM), 2 8,2 2,1 
nymph (ZMA), same data as holotype. 
Diagnosis 
Male and female with four pairs of large 
acetabula, gonopore much shorter than length of 
genital field; third and fourth legs of male 
modified. Seta on ventral margin of second palp 
segment on a tubercle; fourth palp segment with 
distinct setal tubercles. 
Description 
Male 
Body 776 (630-863) long and 562 (495-592) wide. 
Dorsal platelets absent. First coxal plates not fused 
medially, but secondary sclerotization present 
between first coxal plates. Glandula Limnesiae 
medial of suture line of third and fourth coxal 
plates; associated setae close to Glandula 
Limnesiae. Genital field with four pairs of large 
acetabula. Gonopore 77 long, much shorter than 
genital field. Excretory pore between associated 
glandularia. Measurements of PI-PV: 19, 125, 89, 
175, 50. Seta on ventral margin of PII on a tubercle, 
seta longer than tubercle. Ventral margin of PIV 
with distinct setal tubercles. Third and fourth legs 
modified. III-leg-6 expanded and flattened, with 
one seta on medial side. IV-leg-5 large, with three 
long, thick setae and eight short, fine setae on 
ventral margin, a row of hyaline setae on 
anteroventral margin, 11 (11-14) setae on medial 
side and three long setae on anterior part of 
segment; distal margin with one curved seta. IV- 
leg-6 ventrally with a row of grooves, anterodorsal 
margin with a group of curved setae, a group of 
fine setae on medial side and anteroposteriorly 
with a 161 long seta. Measurements of first, third 
and fourth legs: I-leg-4-6: 154,146, 144,1-leg-6 with 
an undulating ventral margin. III-leg-4-6: 240, 236, 
199. IV-leg-4-6: 228, 388, 248. Second, third and 
fourth legs with swimming setae. 
Female 
Body 553-1018 long and 456-795 wide. Dorsal 
platelets absent. Position of Glandula Limnesiae as 
in male. Genital field with two pairs of four, large 
acetabula. Palp as in male. Measurements of PI-PV: 
22, 125, 60, 173, 53. Measurements of I-leg-4-6: 115, 
125, 120. Measurements of IV-leg-4-6: 211, 223, 218; 
IV-leg-6 with a 132 long seta. Third and fourth legs 
with swimming setae. 
Remarks 
Now that the second Physolimnesia species is 
known, the diagnosis of the genus has to be 
altered: genital field with three or four pairs of 
acetabula. The new species differs from 
