1974] 
Kukalova-Peck — Diaphanopterodea 
331 
Rs area small, with about 3 Rs branches. Hind wing similar to the 
fore wing, slightly shorter and broader proximally. 
Paradiapha has a similar wing shape to Parelmoa J from which 
it differs in having a shorter Sc and by having MA almost anasto- 
mosed with Rs. From all other genera it differs in the wings being 
very broad in the distal third. 
Paradiapha delicatula n.sp. 
Figure 21, 22 
The species is based upon two specimens. The holotype consists 
of the fragment of the right fore wing, of an almost complete left 
hind wing, and of the basal third of the right hind wing, all in 
partly folded position. Specimen No. 16/1974 is represented by the 
fragments of overlapping fore and hind wings, broad pterothorax 
and a remnant of the hind leg, with prominent setae on the tibia. 
Fore wing: length about 12.9 mm, width about 4.3 mm. Wing 
membrane very thin. Anterior margin strongly bent apically, apex 
shifted posteriorly. C serrated, with a series of long setae. Rs 
strongly curved posteriorly, sending off 3 branches. MA, MP, CuA, 
CuP and anal veins simple. Hind wing almost identical with the 
fore wing, slightly shorter. 
Holotype: No. 15/1974 (right fore wing fragment, length 12.6 
mm; left hind wing fragment, length 12.8 mm, width 4.3 mm; 
right hind wing fragment, length 7.4 mm, width 4 mm; reverse); 
specimen No. 16/1974 (fore wing fragment, length 8.7 mm; hind 
wing fragment, length 6.2 mm; hind tibia, length 1.8 mm; obverse). 
Paleontological Institute of Charles University, Prague, Czecho- 
slovakia. 
Discussion 
On superficial examination, the wing base in Permodiapha does 
not differ from the generalized neopterous type. The axillary region 
penetrates deeply into the wing, from which it is separated by the 
basal fold. However, careful study reveals that instead of the 
second and third axillary sclerites, which would be located proximally 
from the basal fold in true Neoptera, there is a large basal plate 
which is characteristic of the Paleoptera. The true axillary sclerite 
(fig. 9, Ax), perhaps homologous with 2Ax in Ephemeroptera 
( sensu Tsui and Peters, 1972), is located much more distally, in the 
“paleopterous” position. 
