Leptomonas is a genus of parasitic flagellate protist belonging to family Trypanosomatidae and subfamily Leishmaniinae sensu Maslov & Lukeš 2012. It is a monoxenous parasite of mainly Hemiptera, Diptera, and Siphonaptera insects.
In addition to Leptomonas, one-host trypanosomatids from insects have been traditionally placed in genera Crithidia, Blastocrithidia, Herpetomonas, Rhynchoidomonas, and Wallaceina.
Systematics The etymology of the genus name Leptomonas derives from the two Ancient Greek words (), meaning "fine-grained, tiny", and (), meaning "alone, isolated" (as an adjective), or "a unit" (as a name).
There are 18 species of Leptomonas. Leptomonas agilis Chatton Leptomonas brasiliense (Franchini) França Leptomonas buetschlii W.S. Kent Leptomonas ciliatorum H.-D. Görtz & J. Dieckmann, 1987 Leptomonas costoris Wallace, Todd & Rogers Leptomonas davidi Lafont Leptomonas gerridis (Patton) Berliner Leptomonas karyophilus Gillies & Hanson Leptomonas lata Skvortzov Leptomonas leptoglossi Hanson & McGhee Leptomonas lunulata Massart Leptomonas lygaei (Patton) Berliner Leptomonas melophagia (Flu) Berliner Leptomonas moramango Leptomonas mesnili Roubaud Leptomonas muscae-domesticae (Diesing) Senn Leptomonas pangoniae Rodhain, Pons, Vandenbranden & Bequaert Leptomonas pisciformis Skvortzov Leptomonas soudanensis Roubaud
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