Discussion
Which type of lifecycle is observed in thrips?
Answer: B
The keyed answer is Incomplete lifecycle.
Thrips (order Thysanoptera) are generally classed with the hemimetabolous insects: the egg gives a nymph, the nymph feeds and moults, and the adult appears without a full larval-pupal-adult sequence. This is described as incomplete metamorphosis, and it is how the keyed answer reads.
They do have a distinct feature: after the two feeding nymphal stages come one or two non-feeding, pupa-like stages (the propupa and pupa), and some authors call this intermediate or neometabolous development. The pupa-like stages do not involve the internal reorganisation of a true holometabolous pupa, so the standard classification remains incomplete metamorphosis. 'Complete' would be wrong in either view.
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