"Recently the species traditionally called
T. yuccasella has been identified as being a complex of at least 13 species, many of which have very distinctive biology. Among them are two non-pollinating species of 'cheater yucca moths'. The reader should bear in mind that many papers written before the recent revision that provide, e.g., measures of seed consumption, actually provide composite measurements of all coexisting species. This problem only applies to the
yuccasella complex ("the white species")."
Tree of Life