triungulin

Century Dictionary and Cyclopedia

1. n. The first larval stage of a stylopid insect.
2. n. The first larval stage of the hypermetamorphic blister-beetles, or Meloïdæ. See also cut under Meloë.

Wiktionary

1. n. The first-instar larva of a parasitic beetle with three claws on each foot.
2. n. The first-instar larva of any of various other insect parasites or parasitoids with a similar life cycle.