Cyclocephala melanocephala (Fabricius, 1775)

Rodrigues, Sérgio Roberto & EntomoBrasilis, Andrezza Santos Cocco, 2024, Antennal ultrastructure of three species of Cyclocephala Dejean, 1821 (Coleoptera: Scarabaeidae), EntomoBrasilis (e 1079) 17, pp. 1-8 : 3-4

Cyclocephala melanocephala (Fabricius, 1775)

No statistically significant differences were observed between females and males in terms of the length and width of the proximal, medial, and distal flagellomeres of the lamellae, as indicated by the following statistical results: length of proximal flagellomere of the lamella (t =0.40; df=11; P <0.34) and width (t= 1 .09; df=4; P <0.16); length of medial flagellomere of the lamella (t =0.06; df=7; P <0.47) and width (t =0.57; df=3; P <0.30); length of distal flagelommere of the lamella (t =0.46; df=5; P <0.33) and width (t =1.66; df=6; P <0.07) ( Table 1, Figure 6 ).

Regarding the dimensions of the placoid sensillae, the following average diameters were observed in females and males: type I placoid sensilla: 7.91 ± 1.47 µm in females and 7.78 ± 1.30 µm in males; type II placoid sensilla: 8.54 ± 0.92 µm in females and 8.40 ± 1.16 µm in males ; type III placoid sensilla: 8.58 ± 1.03 µm in females and 8.78 ± 0.82 µm in males .

being type I placoid (95.11%) and coeloconic (4.89%) ( Table 2).

The inner surfaces of the lamellae displayed a combination of homogeneous and heterogeneous areas. These areas were characterized by the presence of distinct types of sensillae, including type III placoid sensilla, types I and II placoid sensilla, and types I and II coeloconic sensilla ( Figures 6 and 8 ) .

Figures

Figure 6. Antennal lamella of Cyclocephala melanocephala (Fabricius, 1775): A, C, E, G, I) left female lamellae; B, D, F, H, J) right male lamellae. Legend: (dl) Distal lamella; (ex) outer side; (in) inner side; (ml) medial lamella; (pl) proximal lamella. Scale = 100 µm.

Figure 8. Medial flagellomere of lamella of Cyclocephala melanocephala (Fabricius, 1775): A) heterogeneous areas; B) homogeneous areas. Scale = 100 µm.