I just had this strepsipteran larva ID'ed by Hans Pohl, who placed it into the family Xenidae. As Chuck Entz gently pointed out
, the type genus for Xenidae is Xenos
, which is the only genus given in the guide for the family Stylopidae.
I don't know if there is big controversy about the existence of the family/subfamily status of Xenidae/Xeninae, but I looked up a few of Dr. Pohl's publications and he certainly is expert and actively working on Strepsiptera. In 2002 he published the following article re-establishing the family status of Xenidae, based on Stylopidae being paraphyletic.He also regards Elenchidae as a family, which Nearctica does not, and which is interesting to me because I have an adult male specimen I've been meaning to photograph, and it would be in Elenchidae.
Pohl, H. 2002. Zoologica Scripta 31:1
Phylogeny of the Strepsiptera based on morphological data of the first instar larvae
This investigation was the first cladistic analysis using morphological data of first instar larvae of Strepsiptera. The analysis of representatives of nearly all known families of Strepsiptera supports the division of Strepsiptera into Mengenillidia and Stylopidia. Corioxenidae and Elenchidae are placed at the base of Stylopidia. Halictophagidae is the sister group to Xeninae + Myrmecolacidae + Stylopinae. Xeninae is placed as the sister group to Myrmecolacidae + Stylopinae. Stylopidae are paraphyletic. Thus, Xenidae stat. n. is re-established. A sister-group relationship between Myrmecolacidae and Elenchidae is not supported on characters of first instar larvae.