Tegeticula shares one synapomorphy with Parategeticula:
- tentacle-like appendages arising ventrally between the first and second segments of the maxillary palps in the female (secondarily lost in some Tegeticula)
Two traits that distinguish Tegeticula from Parategeticula are:
- a sword-shaped ovipositor, used to cut into the host ovary
- three pairs of setae on the anal plate in the larva (two in Parategeticula)
Maxillary tentacles and pollen load of T. carnerosanella, a species in the Tegeticula yuccasella complex.
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