Cryptopleurum minutum (Fabricius, 1775)

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 : 55

Cryptopleurum minutum third- instar larva

Morphometry. Measurements and ratios in Table 1 .

Chaetotaxy. Head capsule ( Figs. 38–40 ). Frontale without secondary sensilla and lacking egg-bursters; FR8 and FR9 proportionally longer; gFR1 with eight short setae. Each parietale with five secondary sensilla; one short seta near PA9, one pore between pore PA19 and seta PA20, one rather short seta close to seta PA8, one short seta near group PA12–14 and one short seta close to seta PA 11; setae PA8, PA9, PA16, PA18 and PA21 proportionally longer. Antenna ( Fig. 41 ). Without secondary sensilla, sensory appendage (SE1) proportionally shorter; gAN on A3 with a group of at least six sensilla. Mandibles ( Figs. 42–43 ). Each mandible with three short secondary setae, two on basal outer face, behind MN1, third one minute, behind pore MN4. Maxilla ( Figs. 44–46 ). Without secondary setae; setae MP6, MP13, MX 14 and MP21 proportionally longer. Labium ( Figs. 39 , 47 ). Without secondary sensilla, seta LA6 proportionally longer; short seta LA5 present, lateral to pore LA7.

Figures

FIGURES 38–43. Cryptopleurum minutum, third instar larva. (38) head capsule, dorsal view; (39) head capsule, ventral view; (40) clypeolabrum, dorsal view; (41) antenna, dorsal view; (42) mandible, dorsal view; (43) mandible, dorsal view. Scale bars, Figs. 38–39: 0.1 mm; Figs. 40–43: 0.025 mm.

FIGURES 44–47. Cryptopleurum minutum, third instar larva. (44) right maxilla, ventral view; (45) right maxilla, dorsal view; (46) left stipes, dorsal view; (47) labium, ventral view. Scale bars: 0.025 mm.