Pneumolaelaps hyatti (Evans & Till)

Joharchi, Omid, Tolstikov, Andrei V., Khaustov, Alexander A., Khaustov, Vladimir A. & Sarcheshmeh, Mohammadhassan Abbasi, 2019, Review of some mites (Acari: Laelapidae) associated with ants and bumblebees in Western Siberia, Russia, Zootaxa 4613 (1), pp. 71-92 : 86

Pneumolaelaps hyatti (Evans & Till)

Figures 56–61 .

Hypoaspis (Pneumolaelaps) hyatti Evans & Till, 1966: 198 .

Hypoaspis (Pneumolaelaps) hyatti .— Costa, 1966: 191; Bregetova, 1977: 523; Karg, 1979: 91; 1982: 245; 1993: 150; Davydova & Nikolsky 1986: 95.

Hypoaspis hyatti .— Lapina, 1976: 43; Ren & Guo, 2008: 329.

Pneumolaelaps hyatti .— Ye & Ma, 1991: 100; Farrier & Hennessey, 1993: 85; Ren & Guo, 2008: 328.

Qinghailaelaps gui Bai, 1992: 199 (junior synonymy by Ma, 2006: 23).

Specimens examined. Five females, RUSSIA, Tyumen Province, vicinity of lake Kuchak, 57°21’N, 66°03’E, 27 April and 06 September 2018 O. Joharchi coll., on Bombus sp. ( Hymenoptera : Apidae ).

Notes. Pneumolaelaps hyatti was described from Great Britain ( Evans & Till, 1966) where it was found on Bombus muscorum L. ( Hymenoptera : Apidae ) and Davydova & Nikolsky (1986) reported this species from Western Siberia on the basis of specimens collected on bumblebees. We have not had the opportunity to examine any specimens to confirm this identification. This species is widely distributed in Asia, Europe and Russia in association with bumblebees or their nests ( Costa, 1966; Bregetova, 1977; Karg, 1993; Lapina, 1976; Ye & Ma, 1991). We take the opportunity to supplement the description given by Evans & Till (1966), on the basis of the new specimens. Our specimens agree well with the both description given by Evans & Till (1966, Fig. 33 ) and Costa, 1966. The species is easily recognised by small cells of reticulation of dorsal shield, mostly as long as wide, dorsal shield setae j2, j3, z2–z4, s1–s4 and r2–r5 as long as j1, setae of opisthonotal area decreasing in length from anterior to posterior ( Fig. 56 ), pre-sternal and sternal shields well separated, posterior margin of sternal shield strongly concave ( Fig. 57 ), poststigmatal plate prominent, elongated triangular ( Fig. 58 ), genital shield elongate, rounded posteriorly, surface with irregular diagonal lines and polygonal cells and expanded well just posterior to genital setae (st5) ( Fig. 57 ), anal shield nearly as long as wide, hypostomal groove with six rows, each row with 3–6 denticles ( Fig. 59 ). Some dorsal setae on femur and tibia legs I & II thickened (see Fig. 61 ).

Figures

FIGURES 56–61. DIC micrographs of Pneumolaelaps hyatti, female. 56, idiosoma in dorsal view; 57, idiosoma in ventral view; 58, stigma and post-stigmatic section; 59, subcapitulum; 60, epistome; 61, femur and tibia of legs I & II.

FIGURES 26–34. DIC micrographs of Cosmolaelaps siberiensis sp. nov., female. 26, idiosoma in dorsal view; 27, idiosoma in ventral view; 28, general view of some dorsal setae, 29, genital and anal shields, general view of some opisthogastric setae; 30, genital and sternal shields; 31, epistome; 32, subcapitulum; 33, chelicera, fixed digit; 34, palp and apotel.