Cantharidin is a potent chemical vesicant (blister-causing agent) and terpenoid extracted from blister beetles (Order: Coleoptera, Family: Meloidae, e.g., Mylabris phalerata, Epicauta spp., and Lytta vesicatoria known as the 'Spanish fly'). It is released by reflex bleeding from leg joints as a chemical defense.

Family Sisyridae (spongillaflies) belongs to the Order Neuroptera. They are unique semi-aquatic neuropterans whose larvae live submerged in freshwater bodies, exclusively feeding as specialized predators/parasites on freshwater sponges (Spongillidae) and bryozoans.

Both Statement (I) and Statement (II) are true:

• Family Hesperiidae (skippers) are characterized by rapid, darting, and erratic flight behavior, hooking antennae, and stout bodies.
• Hesperiid larvae are typically smooth-bodied, spindle-shaped (tapering at both anterior and posterior ends), completely lacking prominent dorsal setae, with a prominent constricted 'neck' behind a large, heavily sclerotized head.

Taxonomic classification of the mustard sawfly:

• The mustard sawfly (Athalia lugens proxima) belongs to the suborder Symphyta, Family Tenthredinidae, under the Order Hymenoptera.
• Unlike apocritan hymenopterans, sawflies have a broad abdomen without a wasp waist (petiole) and the female possesses a saw-like ovipositor used to slit plant tissues for egg laying. It is the only hymenopteran insect pest of agricultural crops in India, feeding voraciously on cruciferous seedlings.