Haplogastran abdomen is present in

Haplogastran abdomen is present in Scarabaeidae.
The family Scarabaeidae, as currently defined, consists of over 30,000 species of beetles worldwide; they are often called scarabs or scarab beetles.
Scarabs are stout-bodied beetles, many with bright metallic colours, measuring between 1.5 and 160 millimetres (0.059 and 6.3 in). They have distinctive, clubbed antennae composed of plates called lamellae that can be compressed into a ball or fanned out like leaves to sense odours.