Cercyon analis (Paykull, 1798)

Rodriguez, Georgina & Archangelsky, Miguel, 2023, Larval chaetotaxy and morphometry of Megasternini: Cercyon (Paracercyon) Seidlitz, Cryptopleurum Mulsant and Pelosoma Mulsant (Coleoptera: Hydrophilidae), Zootaxa 5318 (1), pp. 45-66 : 52

Cercyon analis third instar larvae

Morphometry. Measurements and ratios in Table 1 .

Chaetotaxy. Head capsule ( Figs. 20–22 ). Frontale usually without secondary sensilla (specimen illustrated with one secondary seta on left side near FR5–6) ( Fig. 20 ); gFR1 with eight setae. Each parietale with five secondary sensilla distributed as in second instar larvae; setae PA8, PA9, PA16 and PA21 proportionally longer than in first instar larvae. Antenna ( Fig. 23 ). Without secondary sensilla, sensory appendage (SE1) proportionally shorter than that of second instar larva. Mandibles ( Figs. 24–25 ). Each mandible with three secondary setae, distributed as in second instar larvae. Maxilla ( Figs. 26–27 ). Stipes without secondary setae, similar to that of second instar larva. Labium ( Figs. 21 , 28 ). Without secondary sensilla, LA6 proportionally longer.

Figures

FIGURES 20–25. Cercyon analis, third instar larva. (20) head capsule, dorsal view; (21) head capsule, ventral view; (22) clypeolabrum, dorsal view; (23) antenna, dorsal view; (24) mandible, dorsal view; (25) mandible, dorsal view. Scale bars, Figs. 20–21: 0.1 mm; Figs. 22–25: 0.025 mm.

FIGURES 26–28. Cercyon analis, third instar larva. (26) left maxilla, dorsal view; (27) left maxilla, ventral view; (28) labium, ventral view. Scale bars: 0.025 mm.