Cheiroseius phoretic on crane fly Erioptera cana, copyright Stephen Luk.

Belongs within: Phytoseioidea.

The Platyseiinae are a group of predatory mites often found in subaquatic or damp habitats. They typically have several large, acutely pointed structures at the ends of legs II–IV, including the pretarsal paradactyli and a median projection of the pulvillus (Lindquist et al. 2009). Species of the genus Platyseius have two to four pairs of J setae on the opisthonotum and sternal setae 1 are distinctly shorter than setae 3 whereas Cheiroseius species have five pairs of J setae on the opisthonotum and the sternal setae 1 and 3 are subequal in length (Evans & Till 1979).

<==Platyseiinae LKW09
    |--Cheiroseiulus LKW09
    |--Platyseius Berlese 1916 [incl. Paraseius Halbert 1915 non Trägårdh 1910, Plesiosejus Evans & Hyatt 1960] FH93
    |    |--P. subglaber (Oudemans 1903) FH93 (see below for synonymy)
    |    |--P. aequalis Schweizer 1949 S61
    |    |--P. basileus Schweizer 1961 S61
    |    |--P. corniger [=Lasioseius corniger, Epicrius corniger] S61
    |    |--P. echinatus Schweizer 1961 S61
    |    |--P. grimseli Schweizer 1961 S61
    |    |--P. handschini (Schweizer 1949) [=Episeius handschini] S61
    |    |--P. horridus (Evans & Hyatt 1960) [=Plesiosejus horridus] FH93
    |    |--P. italicus ET79 [=Episeius italicus S61]
    |    |--P. major LKW09
    |    |--P. michaeli S61
    |    |--P. mutilus [=Episeius mutilus] S61
    |    |--P. neocorniger S61
    |    |--P. ovaspini (Schweizer 1929) S61
    |    |--P. serratus (Halbert 1915) [=Paraseius serratus] S61
    |    |--P. tenuipes S61
    |    `--P. trupchumi Schweizer 1961 S61
    `--Cheiroseius Berlese 1916 [incl. Episeiella Willmann 1938, Episeius Hull 1918] ET79
         |  i. s.: C. areolacus McDaniel & Bolen 1983 FH93
         |         C. browningi WK90
         |         C. cassiteridus (Evans & Hyatt 1960) [=Sejus cassiteridum] FH93
         |         C. curtipes (Halbert 1923) (see below for synonymy) FH93
         |         C. glaber WL89
         |         C. groenlandicus (Haarløv 1942) [=Episeius groenlandicus] FH93
         |         C. hurlbutti Baker, Delfinado & Abbatiello 1976 FH93
         |         C. mackerrasae (Womersley 1956) [=Platyseius mackerrasae] H98
         |         C. neborealis (Evans & Hyatt 1960) [=Sejus neborealis] FH93
         |         C. necorniger (Oudemans 1904) [=Hypoaspis necorniger] FH93
         |         C. parbatensis WL95
         |--C. (Cheiroseius) FH93
         |    |--*C. (C.) unguiculatus (Berlese 1887) [=Seius unguiculatus] ET79
         |    |--C. (C.) antillanus (Evans & Hyatt 1960) [=Sejus antillanus] FH93
         |    |--C. (C.) bellingeri Evans & Hyatt 1960 FH93
         |    |--C. (C.) borealis (Berlese 1904) [=Ameroseius borealis; incl. Episeius montanus Willmann 1949] FH93
         |    |--C. (C.) greeneae (De Leon 1964) [=Sejus greeneae] FH93
         |    |--C. (C.) hulli (Evans & Hyatt 1960) [=Sejus hulli] FH93
         |    |--C. (C.) nasutus Karg 1981 FH93
         |    `--C. (C.) tennesseensis (De Leon 1964) [=Sejus tennesseensis; incl. C. flagellatus Karg 1979] FH93
         `--C. (Posttrematus) FH93
              |--C. (P.) cascadensis (De Leon 1964) [=Sejus cascadensis] FH93
              |--C. (P.) floridianus (De Leon 1964) [=Sejus floridianus] FH93
              |--C. (P.) guthriei (Ewing 1913) FH93 (see below for synonymy)
              |--C. (P.) insculptus (Keegan 1946) [=Pachyseius insculpta] FH93
              |--C. (P.) laelaptoides (Berlese 1887) (see below for synonymy) FH93
              |--C. (P.) mutilus (Berlese 1916) [=Lasioseius mutilus] FH93
              `--C. (P.) nodosus (Evans & Hyatt 1960) [=Sejus nodosus] FH93

Cheiroseius curtipes (Halbert 1923) [=Lasioseius (Episeius) glaber var. curtipes; incl. Episeius ovaspini Schweizer 1949] FH93

Cheiroseius (Posttrematus) guthriei (Ewing 1913) FH93 [=Podocinum guthriei FH93; incl. Sejus jamaicensis Evans & Hyatt 1960 FH93, Cheiroseius jamaicensis WL95]

Cheiroseius (Posttrematus) laelaptoides (Berlese 1887) [=Epicrius laelaptoides; incl. Parasejus glaber var. minor Trägårdh 1910, Lasioseius (Episeius) sphagni] FH93

Platyseius subglaber (Oudemans 1903) FH93 [=Hypoaspis subglabra FH93; incl. Lasioseius (*Platyseius) capillatus Berlese 1916 ET79, FH93, L. listrophorus Schweizer 1924 FH93]

*Type species of generic name indicated


[ET79] Evans, G. O., & W. M. Till. 1979. Mesostigmatic mites of Britain and Ireland (Chelicerata: Acari-Parasitiformes). An introduction to their external morphology and classification. Transactions of the Zoological Society of London 35: 139–270.

[FH93] Farrier, M. H., & M. K. Hennessey. 1993. Soil-inhabiting and free-living Mesostigmata (Acari-Parasitiformes) from North America: an annotated checklist with bibliography and index. North Carolina Agricultural Research Service, North Carolina State University, Technical Bulletin 302: i–xvi, 1–408.

[H98] Halliday, R. B. 1998. Mites of Australia: A checklist and bibliography. CSIRO Publishing: Collingwood.

[LKW09] Lindquist, E. E., G. W. Krantz & D. E. Walter. 2009. Order Mesostigmata. In: Krantz, G. W., & D. E. Walter (eds) A Manual of Acarology 3rd ed. pp. 124–232. Texas Tech University Press.

[S61] Schweizer, J. 1961. Die Landmilben der Schweiz (Mittelland, Jura und Alpen): Parasitiformes Reuter, mit 246 Arten und Varietäten und 268 meist kombinierten Originalzeichnungen. Denkschriften der Schweizerischen Naturforschenden Gesellschaft [Mémoires de la Société Helvétique des Sciences Naturelles] 84: i–vii, 1–207.

[WK90] Walter, D. E., & D. T. Kaplan. 1990. Antagonists of plant-parasitic nematodes in Florida citrus. Journal of Nematology 22 (4): 567–573.

[WL89] Walter, D. E., & E. E. Lindquist. 1989. Life history and behavior of mites in the genus Lasioseius (Acari: Mesostigmata: Ascidae) from grassland soils in Colorado, with taxonomic notes and description of a new species. Canadian Journal of Zoology 67: 2797–2813.

[WL95] Walter, D. E., & E. E. Lindquist. 1995. The distributions of parthenogenetic ascid mites (Acari: Parasitiformes) do not support the biotic uncertainty hypothesis. Experimental and Applied Acarology 19: 423–442.

Last updated: 22 February 2020.

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