Derallus paranensis Oliva, 1981

First instar larva. Chaetotaxy. Very similar to that of D. angustus except for the following differences. Head capsule (Figs. 23–25). Frontale with seta FR5 longer than FR6; seta FR6 short and stout; seta FR10 longer; setae of gFR2 more evenly distributed. Parietale with PA1 slightly longer; pore-like sensillum PA 3 in a transverse line with seta PA2; seta PA12 closer to PA13 than to PA7; seta PA14 much longer; seta PA26 shorter than PA28. Antenna (Fig. 26). A1 with inner sensory appendage bearing AN4 with short spine-like projections; seta AN10 longer, setae AN10-11 placed on membrane connecting with A3. Mandible (Fig. 27). Seta MN1 slightly longer. Maxilla (Figs. 28–29). Pore-like sensillum MX 3 visible in ventral view; seta MX 16 of first palpomere much longer; gMX with one long sensillum. Labium (Figs. 24, 30–31). Pore-like sensilla LA4 and LA7 closer to apical margins of mentum and prementum respectively.

Morphometry. Measurements and ratios shown in Table 1.

Third instar larva. Chaetotaxy. Head capsule (Figs. 32–34). Frontale without secondary sensilla; FR5 as long as FR6; seta FR10 much shorter than FR9. Ventral face of parietale with three pairs of short secondary setae arranged in a longitudinal line, one mesal to pore-like sensillum PA17, another mesal pore-like sensillum PA15 and the third pair mesal to seta PA18; setae PA7-8 much shorter, seta PA11 slightly shorter than PA14. Antenna (Fig. 35). Without secondary sensilla, SE1 slightly shorter; seta AN11 proportionally longer. Mandible (Fig. 36). With several (11–13) minute and very short secondary setae along outer margin between base of mandible and seta MN1; MN1 proportionally shorter. Maxilla (Figs. 37–38). Stipes with eight short secondary setae along outer margin; MX 10-11 proportionally longer; MX 13, 23-24 proportionally longer. Labium (Figs. 33, 39–40). Mentum with three pairs of secondary setae; dorsally one pair short and stout setae on anterolateral corner, the other pair long, distal, close to midline, behind LA8; remaining pair ventral, short, subapical on outer margin; seta LA6 much shorter.

Morphometry. Measurements and ratios shown in Table 1.