Figure 4
From: Jumping mechanism in the marsh beetles (Coleoptera: Scirtidae)
Femoro-tibial joint of the hind jumping leg of Scirtes hemisphaericus, light microscopy (A–E) and confocal laser scanning microscopy (CLSM) (F–I). Resilin-bearing extensor ligament is bright blue or purple-blue. (A) Femoro-tibial joint with flexed tibia showing the position of lateral projection, external view, lateral side. (B) Femoro-tibial joint with flexed tibia showing the position of medial projection, external view, medial side. (C) Tibial base and tibial flexor sclerite with the conical projection of tibial flexor sclerite (TFS). (D) Femoro-tibial joint with the flexed tibia, TFS conical projection inserted into the socket of tibial base and is in locked position. TFS conical projection and corresponding socket on tibia are outlined by white dashed line. (E) Femoro-tibial joint with extended tibia, external view; TFS conical projection is outside of the corresponded socket of tibial base and is in unlocked position. (F) Tibial base and muscles connected by the extensor ligament, lateral view. (G) Femoro-tibial joint externally, lateral view. (H) Sagittal section of the femur. I, Tibial base with extensor ligament, lateral view. TFS tibial flexor sclerite.
