On the systematics of Phlebotomus betisi and two new related species from Laos with proposal of the new subgenus Lewisius

Phlebotomus betisi was described from Malaysia and classified after its description in the subgenus Larroussius. It was the only species to have a pharyngeal armature composed of dot-like teeth and an annealed spermatheca whose head is carried by a neck in females. Males were characterized by having a style bearing five spines and a simple paramere. The study of sandflies originating from a cave in Laos enabled us to discover and describe two sympatric species close to Ph. betisi Lewis & Wharton, 1963 and new for Science: Ph. breyi Vongphayloth & Depaquit n. sp., and Ph. sinxayarami Vongphayloth & Depaquit n. sp. They were characterized morphologically, morphometrically, geomorphometrically, molecularly, and proteomically (MALDI-TOF). All approaches converged to validate the individualization of these species whose morphological differential characters lay in the two genders by the observation of the interocular suture and by the length of the last two segments of the maxillary palps. In males, the length of the genital filaments discriminates these species. Females are distinguished by the length of the ducts of the spermathecae as well as by the narrow or enlarged shape of the neck bearing their head. Lastly, the particular position of the spines of the gonostyle coupled with molecular phylogeny led us to remove these three species from the subgenus Larroussius Nizulescu, 1931 and to classify them in a new subgenus: Lewisius Depaquit & Vongphayloth n. subg.

Automated summary

Through the study of sandflies from a cave in Laos, two closely related and new species to the scientific community were discovered and described, namely, Ph. breyi Vongphayloth & Depaquit n. sp. and Ph. sinxayarami Vongphayloth & Depaquit n. sp., which were closely related to Ph. betisi Lewis & Wharton, 1963. These species were characterized using morphological, morphometric, geomorphometric, molecular, and proteomic (MALDI-TOF) approaches. Furthermore, the particular position of the spines of the gonostyle coupled with molecular phylogeny led to the reclassification of these three species into a new subgenus: Lewisius Depaquit & Vongphayloth n. subg.