REVISION OF SIMOCEPHALUS DAPHNIIDAE 


31 
Ne 



O Ss. exspinosus 
@s. acutirostratus 
© S. victoriensis 
@ S. rostratus 
Fig. 32 Locations, where studied material of S. (Echinocaudus) was collected. 
S. brehmi Gauthier, 1939 stat. nov. 
Fig. 37 
Simosa acutirostrata brehmi Gauthier, 1939: 144; Simocephalus 
acutifrons Johnson, 1954: 954 syn. nov. 
TYPE MATERIAL. Types (59 Qad.) were in Gauthier’s collection 
before it was nationalized by the Algerian government. There is no 
information about the place, where this collection is now (Hudec, 
1993). 
MATERIAL EXAMINED. (Fig. 32) Type material of junior synonym S. 
acutifrons Johnson. Holotype: South Africa, Kempton Park, Johan- 
nesburg: MPA: 9 ad. (BMNH). Paratype collected with holotype: 
MPA: 9 ad.(BMNH). Other specimens: Tanzania, Mt Hanang: 
23 2 Qad., 29 Yjuv. (MCA). Southern Rhodesia, Plumtree, 7. 2. 
1954: 49 Qad., 9e., 29 Yjuv. (ZICC). 
DIAGNOSIS. Measurements. 9 9 ad.: 1.0-3.0mm. 
Female (Fig. 37). General body shape ovoid. Frons with small 
obtuse prominence not separated above and below by depressions. 
Dorso-posterior valve prominence distinct, separated above and 
below by deep, wide depressions. Diameter of circle inscribed in it 
moderate. Dorsal margin with denticles. Proximal and distal supra- 
anal angles large, embayments of postabdomen deep, proximal 
angle sharp. 
DISTRIBUTION. (Fig. 32) Vicinity of Lake Chad, Southern Rhode- 
Q@ S. victoriensis & S. exspinosus 
@© S. acutirostratus gS. exspinosus 
@ S. exspinosus & S. congener 
Os. brehmi 
@ S. obtusatus 
© S. daphnoides 
@ undescribed species of S. (acutirostratus) group 
sia, Tanzania, South Africa. This species is also reported from Brasil 
by Brehm (Gauthier, 1939). Unfortunately, no specimen of this 
species group from SouthAmerica is available and it is impossible to 
confirm or to disprove this report. 
REMARKS. _ S. brehmi differs from S. acutirostratus in the shape of 
the valves and postabdomen. These forms are allopatric, so the 
question of specific or subspecific rank of S. brehmi is difficult, but 
I take S. brehmi to be a separate species because the differences 
between it and S. acutirostratus are not less than those between other 
species in this group. 
S. acutifrons, described from Johannesburg (South Africa), is 
identical to S. brehmi, judging by the examined type material. 
Johnson (1954) does not point out any characters which distinguish 
his species from S. brehmi and S. acutirostratus. 
S. rostratus Herrick, 1884 
Fig. 38 
Simocephalus rostratus Herrick, 1884. 
TYPE MATERIAL. ‘The type is probably lost, like those of other 
species described by Herrick (D. Frey, personal communication 
through N.N. Smirnov). 
MATERIAL EXAMINED. (Fig. 32) Canada, Waterloo National Park, 
15. 9. 1972, leg. Smirnov: 102 Qad., 102 Qjuv. (AC). 
