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C

Cauda:

A posterior projection on the tip of the abdomen

Cornicles:

Same as siphunculi

P

Processus terminalis:

The thinner distal part of the last antennal segment in aphids (divided into a proximal part and a thinner distal part)

S

Siphunculi:

A pair of prominent structures on the posterior dorsum of the abdomen, called cornicles or siphunculi. Reduced to mere pores in some species.