Hypoaspis is a genus of mites in the family Laelapidae. Description Hypoaspis is superficially similar to related genera such as Coleolaelaps, Mumulaelaps and Promacrolaelaps. It can be distinguished by: a rounded and oval dorsal shield without lateral incisions, and with 35–40 pairs of setae including one or more pairs of Zx setae; opisthonotal seta Z4 being very long and wavy; the sternal shield having a distinct anterior margin; h3 being longest out of the hypostomal setae; the first leg pair being longer than the third leg pair; the second and third femurs on each side with macrosetae present; the tarsus of the second leg pair with thick subterminal spines; and the post-anal seta shorter than or equal in length to the para-anal setae. This genus of mites is often associated with beetles, especially scarab beetles, but the nature of this association is uncertain. Hypoaspis may be parasites of eggs and larvae, or they may be commensals that feed on beetle exudates or on other small invertebrates associated with beetles. Biological control The genus once contained the species H. aculeifer and H. miles, which are used for biological pest control of sciarid and phorid fly larvae in mushrooms. However, these species have since been moved to genera Gaeolaelaps and Stratiolaelaps, respectively. Species The composition of Hypoaspis is uncertain. It has historically been a large genus with multiple subgenera. It was later reduced to only the members of subgenus Hypoaspis (Hypoaspis) or Hypoaspis sensu stricto. There are currently 36 species. Below is a list of species currently and formerly included in Hypoaspis: Hypoaspis aciphila Karg, 1987 Hypoaspis acme Womersley, 1955 Hypoaspis aculeifer (G. Canestrini, 1884) Hypoaspis aculeiferoides Teng, 1982 Hypoaspis acutiscutus (Teng, 1982) Hypoaspis analis Karg, 1982 Hypoaspis angulatus (Berlese, 1916) Hypoaspis angusta Karg, 1965 Hypoaspis anserina Karg, 1981 Hypoaspis ardoris Karg, 1993 Hypoaspis armstrongi (Womersley, 1956) Hypoaspis astronomica (C.L. Koch, 1839) Hypoaspis australis Hull, 1923 Hypoaspis austriacus (Sellnick, 1935) Hypoaspis aviator (Berlese, 1920)) Hypoaspis baichengensis Ma, 2000 Hypoaspis barbarae Strong, 1995 Hypoaspis barbatula Karg, 1989 Hypoaspis berlesei Bernhard, 1973 Hypoaspis bipennata Karg, 2003 Hypoaspis bispinosa Karg, 1997 Hypoaspis blattae Strong & Halliday, 1994 Hypoaspis brevidentis Karg, 1978 Hypoaspis brevipedestra Karg, 1985 Hypoaspis brevipellis Karg, 1979 Hypoaspis brevistilis Karg, 1978 Hypoaspis campestris (Berlese, 1887) Hypoaspis cassoidea Karg, 1981 Hypoaspis cerata Karg, 1982 Hypoaspis changlingensis Ma, 2000 Hypoaspis chelaris Teng, Zhang & Cui, 1992 Hypoaspis chianensis Gu, 1990 Hypoaspis chini (Bai & Gu,