A new species of Amblyseius Berlese (Acari: Phytoseiidae) from Japan
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ORIGINAL ARTICLE
A new species of Amblyseius Berlese (Acari: Phytoseiidae) from Japan Mohamed W. Negm 1,2
&
Tetsuo Gotoh 3
Received: 28 January 2020 / Accepted: 8 May 2020 # Institute of Zoology, Slovak Academy of Sciences 2020
Abstract A new phytoseiid mite species, Amblyseius marunumus sp. n., is described and illustrated based on female and male specimens collected from Gunma, Japan. The new species belongs to the americanus species-group, due to the presence of setae J2 and Z1, and having setae z4 longer than z2. Amblyseius marunumus sp. n. is morphologically close to A. yadongensis Wu, but differs conspicuously in the length of the dorsal idiosomal setae z4, r3, S2, S5 and the shape of spermatheca. Keywords Mites . Taxonomy . Phytoseiidae . New species . Japan
Introduction The Phytoseiidae (Acari: Mesostigmata) is a large family of predatory mites that includes certain species known as potential natural enemies against some agricultural pests (McMurtry and Croft 1997). In Japan, Ehara and Amano (1998) revised the Japanese phytoseiid mite fauna and included 77 species. Currently, this number has increased to 96 species (Toyoshima et al. 2013; Shimano 2019). Mites of the genus Amblyseius Berlese, 1914 are worldwide in distribution and occur in a wide variety of habitats (Demite et al. 2014). Chant and McMurtry (2004) proposed five species-groups in this genus based on, (i) the presence or absence of setae J2 and Z1, (ii) the ratio between the length of setae z4 and the distance between setae z4 and s4, and (iii) the shape of ventrianal shield. The americanus species-group Denmark and Muma, 1989, subsequently comprises four species-subgroups based on the morphology of the spermathecal calyx in females (Chant and McMurtry 2004).
* Mohamed W. Negm [email protected]; [email protected] 1
Laboratory of Applied Entomology & Zoology, Faculty of Agriculture, Ibaraki University, Ami, Ibaraki 300-0393, Japan
2
Department of Plant Protection, Faculty of Agriculture, Assiut University, Assiut 71526, Egypt
3
Faculty of Economics, Ryutsu Keizai University, Ryugasaki, Ibaraki 301-8555, Japan
The present work describes and illustrates females and males of a new species of Amblyseius, which belongs to the duncansoni species-subgroup in the americanus speciesgroup.
Materials and methods Mites were directly removed from detached plant leaves under stereomicroscope (SZ40®, Olympus) and mounted on glass slides in Hoyer’s medium. Permanent slides were placed on a hot plate at 50 ºC to dry, then sealed with Thorne’s cement® (FHK, Fujihira Industry, Japan) applied around the edge of the coverslip using a slide ringer® (BioQuip Products Inc., CA., USA). Components of the Thorne’s cement were based on Bates (1997). Mites were examined for their different taxonomic features with the aid of phase contrast (BX43®, Olympus) and differential interference contrast (BX53®, Olympus) compound microscopes and drawn with Adobe Illustrator (Adobe Systems Incorporated, USA). The notations used for dorsal and ventral setations fo
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