Small spinules located on the ventral surface of the prolegs of a lepidopterous larva. The arrangement and length of the crochets is often diagnostic of the family. Each spinule is shaped like a crochet hook. Uniordinal crochets are all of a uniform length. Bi-ordinal crochets ore of two lengths arranged in an alternating series. Uniserial crochets are arranged in a single row, bi-serial crochets are arranged in two rows.

hooklike structures on the abdominal prolegs used to grasp substrate.

Tiny hooks on prolegs of caterpillars

Crochets are hook-like spines are the end of the prolegs of caterpillars.