Megaloptera

R. G. Beutel & S. N. Gorb, 2001, Ultrastructure of attachment specializations of hexapods (Arthropoda): evolutionary patterns inferred from a revised ordinal phylogeny, J. Zool. Syst. Evol. Research 39, pp. 177-207 : 182

26 Megaloptera

Tarsomeres with a dense ventral brush of hairs are present in members of Chauliodidae ( Maki 1936: Fig. 32), Corydalidae and Sialidae . Tarsomere 4 is expanded and bilobed in Sialis species ( Theischinger 1991; Figs 3d , 5E,I ).

Figures

Fig. 3. Diversity of the leg attachment devices (gray­colored areas) in hexapods. (a) Arolium (smooth). (b) Pulvilli (smooth or hairy). (c) Empodial pulvillus (ep) (hairy). (d) Hairy adhesive soles of tarsomeres. (e) Eversible pretarsal bladder (smooth). (f) Eversible structure between tibia and tarsus (smooth). (g) Fossula spongiosa (hairy). (h) Euplantulae (eu) and claw pad (cp) (both smooth). (i) Tarsal thorns transformed into adhesive structures (th), claw pad (cp) (both smooth). (j) Adhesive claw setae

Fig. 5. Details of hexapod tarsi and pretarsi. (A) Coreus marginatus (Heteroptera), hindleg, pretarsus, ventro­lateral aspect. (B) Cantharis fusca (Coleoptera, Polyphaga), hindleg, first and second tarsomeres, ventral aspect. (C, D, F) Priacma serrata (Coleoptera, Archostemata), midleg, tarsus, ventral aspect. (E, I) Sialis lutaria (Megaloptera), midleg, tarsus, ventral aspect. (G) Rhagonycha fulva (Coleoptera, Polyphaga), midleg, tarsus, ventral aspect. (H) Cantharis fusca (Coleoptera, Polyphaga), foreleg, tarsus, adhesive setae. HS, hairy soles; PU, pulvilli; TAR, tarsal segments; UN, claw