Transeius volgini (Wainstein et Begljarov, 1971)

Kolodochka, L. A., 2023, The Predatory Mites (Phytoseiidae, Parasitiformes) In The Fauna Of Ukraine: A Review With A Key To Species And New Combinations In The Genus Transeius, Zoodiversity 57 (3), pp. 191-214 : 210-212

Transeius volgini (Wainstein et Begljarov, 1971) ( fig. 9 )

Amblyseius volgini Wainstein & Begljarov, 1971: 1804 ; Chant & McMurtry, 2004: 187; Kolodochka, 2011: 322; Amblyseius (Amblyseius) volgini: Wainstein, 1979: 140 ;

Typhlodromips volgini: Moraes et al., 1986: 152, 2004: 229 ;

Transeius volgini: Chant et McMurtry, 2007: 71 ; Kreiter et al., 2020: 212 ;

Transeius magnus Wu, 1987: 261 (synonymy according to Ryu & Ehara, 1991).

Material. Types. Holotype ♀, Russia, Primorsky Kray, wet meadow, on herbs, 09.09.1961, specimen #1911 (Begljarov) ( ARRIP); paratype 1 ♀, slide #5489 (remounted from slide #1910) ( SIZK).

Non-type. 47 ♀, 19 Ơ (66 specimens): Ukraine: Cherkasy, Chernihiv, Kyiv, Lvіv, Mykolaiv, Rivne, Sumy, Ternopil, Volyn, Zhytomyr Regions .

R e d e s c r i p t i o n. F e m a l e. Dorsal shield ( fig. 9 , 1 ) well sclerotized, oval-ovate, with lateral emarginations, smooth, with a dark border along the edge; solenostomes 7 pairs (it, iv, id, isc, il, is, ic). Among the dorsal setae, AM1, AL3, PM3, and PM4 stand out for their length, of which PM4 is the longest, slightly serrate; the rest are shorter, smooth, pointed AD2–AD4, and AM2 are microsetae. Seta AL1 somewhat longer than seta AL2. Seta AM1 reach or slightly extend beyond theca of seta AL1. Setae PL1 the longest, and PL3 the shortest of the setae in row PL. Perithreme extend beyond the theca of seta AD1, their ends are bent caudally ( fig. 9 , 10). Ventrianal shield pentagonal ( fig. 9 , 2 ), slightly elongated, with nearly parallel or slightly concave lateral margins; anal pores round, distinct, spaced, located caudally as wide as the level of setae PrA2. Metapodal shield distinct, narrow anterior one about half as long as fusiform posterior ( fig. 9 , 3 ). The posterior part of the peritremal shield is slightly curved, beak-shaped at the end ( fig. 9 , 4 ). Df with 8–10 teeth, and Dm with 3 ( fig. 9 , 5 ). The spermatheca is bell-shaped, the walls of the funnel are thickened; atrium sessile ( fig. 9 , 6 ). Leg IV with 3 large macrosetes: almost equal in length on basitarsus and tibia, and shorter on genu ( fig. 9, 9 ). On the genu IV, III, and on the femur and genu II, one short macrosetae each.

Measurements: Lds 430, Wds 250, Lvas 136, Wvas 108, Lian 52, Ltar IV 127; setae length: AD1 20–24; AD2 7, AD3 6; AD4 6; PD2 8; PD4 9; AM1 40; АМ2 5; AL1 22; AL3 16; AL4 46; PL1 23; PL2 12; PL3 10; PM1 10; PM3 62; РМ4 100; AS 20; PS 21; PV 50; MCh IV: ge 66, ti 52, ta 70, MCh III: ge 34, ti 23, MCh II: fe 23, ge 30.

Male. Ventrianal shield with 4 pairs of preanal setae; anal pores round ( fig. 9 , 8 ). The spermatodactyl is L-shaped, curved and rounded at the end ( fig. 9, 9 ). Lds 326.

Diagnosis. Similar to Transeius montanus , from which differs by the ends of the peritremes bent back; by short dorsal setae AD2, AM2, AD3, AD4, PD1; by the relative length of some other setae, differences in the structure of the chelicerae digits and by others smaller characters (see a species profile of T. montanus for more details).

D i s t r i b u t i o n, h a b i t a t, o c c u r r e n c e. Europe: Russia (Primorsky Kray), Slovenia, Ukraine; South Korea. In Ukraine: Polissia (forest zone), forest-steppe zone; trees (prefers conifers, occasionally on hardwoods); common.

Note. Description, measurements and illustrations are based on non-type specimens from Lvіv Region compared with the paratype and the original description of this species .

Key to the species of the genus Transeius of the Ukrainian fauna

1. Ventrianal shield without anal pores ............................................................................................................... 2

— Ventrianal shield with anal pores ..................................................................................................................... 3

2. Chelicera with 6 teeth on Df, with 2 teeth on Dm; length of spermathecal funnel equal to its width, the walls of the funnel are very thick, sharply thinning towards the sacculus ................................ T. herbarius

— Chelicera with 4 teeth on Df, and with 1 tooth on Dm; funnel of elongated spermatheca thick-walled, gradually thinning towards the sacculus ........................................................................................... T. fragilis

3. Funnel of spermatheca conical ......................................................................................................................... 4

— Funnel of the spermatheca of other shape. ..................................................................................................... 5

4. Сhelicera with 2 large distal teeth and 11 miniature teeth on Df, Dm with 3 teeth; funnel of spermatheca is not twisted cochlearly in the part adjacent to the atrium ......................................................... T. jailensis

— Chelicera with 8–9 teeth on Df; funnel of spermatheca in the part adjacent to the funnel is twisted cochlearly ................................................................................................................................................ T. begljarovi .

5. The funnel of the spermatheca mainly tubular in whole, with the largest diameter at the atrium, gradually narrowing towards the sacculus and widening conically approximately from the middle of its length .................................................................................................................................................................... 6

— Funnel of spermatheca bell-shaped .................................................................................................................. 7

6. Dorsal seta PL1 more than three times as long as seta PM1; on Dm 2 teeth ......................... T. proximus .

— Dorsal seta PL1 not more than twice as long as seta PM1; on Dm 1 tooth ............ T. lutezhicus comb. n.

7. Seta PM1 longer than half distance to base of seta PL1 ............................................... T. masseei comb. n.

— Seta PM1 shorter than half distance to base of seta PL1.................................................................................8

8. Ends of the peritremes are bent caudally; anal pores round; chelicera with 3 teeth on Dm ...... T. volgini

— Ends of the peritremes are not bent caudally; anal pores oval; chelicera with one tooth on Dm ............... ............................................................................................................................................ T. montanus , comb. n.

This study was funded for I. I. Schmalhausen Institute of Zoology of the National Academy of Sciences of Ukraine (State Registration Number of the work: 0116U003015, II-51-21) by the National Academy of Sciences of Ukraine.

Acknowledgments

The author is deeply indebted to Valery Korneyev for his kind help in preparing the manuscript for publication and for important comments on its improvement.

Figures

Fig. 9. Transeius volgini (Wainstein et Beglyarov, 1971), ♀ (1–8), Ơ (9, 10): 1 — dorsal shield; 2 — backward curved ends of peritremes; 3 — posterior part of ventral body surface; 4 — metapodal plates; 5 — posterior part of peritremal shield; 6 — chelicera; 7 — spermatheca; 8 — fragment of leg IV; 9 — ventrianal shield; 10 — chelicerae with spermatodactil.

Fig. 1. Transeius begljarovi (Abbasova, 1970), ♀ (1–7), Ơ (8, 9): 1 — dorsal shield; 2 — ventral body surface; 3 — metapodal plates; 4 — posterior part of peritremal shield; 5 — chelicera; 6 — spermatheca; 7 — fragment of leg IV; 8 — ventrianal shield; 9 — chelicerae with spermatodactil.

Fig. 2. Transeius fragilis (Kolodochka et Bondarenko, 1993), ♀ (1–7): 1 — dorsal shield; 2 — ventral body surface;3 — metapodal plates; 4 — posterior part of peritremal schield; 5 — chelicera; 6 — spermatheca; 7 — fragment of leg IV.

Fig. 3. Transeius herbarius (Wainstein, 1960), ♀ (1–7), Ơ (8, 9): 1 — dorsal shield; 2 — ventral body surface; 3 — metapodal plates; 4 — posterior part of peritremal shield; 5 — chelicera; 6 — spermatheca; 7 — fragment of leg IV (macrosetae shown only); 8 — ventrianal shield; 9 — chelicerae with spermatodactil.

Fig. 4. Transeius jailensis (Коlоdосhka, 1981), ♀ (1–7), Ơ (8, 9): 1 — dorsal shield; 2 — ventral body surface; 3 — metapodal plates; 4 — posterior part of peritremal shield; 5 — chelicera; 6 — spermatheca; 7 — fragment of leg IV (macrosetae shown only); 8 — ventrianal shield; 9 — chelicerae with spermatodactil.

Fig. 5. Transeius lutezhicus (Wainstein, 1972), ♀ (1–7), Ơ (8, 9): 1 — dorsal shield; 2 — ventral body surface; 3 — metapodal plates; 4 — posterior part of peritremal shield; 5 — chelicera; 6 — spermatheca; 7 — fragment of leg IV; 8 — ventrianal shield; 9 — chelicerae with spermatodactil.

Fig. 6. Transeius masseei (Nesbitt, 1951), ♀ (1–7), Ơ (8, 9): 1 — dorsal shield; 2 — ventral body surface; 3 — metapodal plates; 4 — posterior part of peritremal shield; 5 — chelicera; 6 — spermatheca; 7 — fragment of leg IV (macrosetae shown only); 8 — ventrianal shield; 9 — chelicerae with spermatodactil.

Fig. 8. Transeius proximus (Кolоdoсhкa, 1991), ♀ (1–9), Amblyseius (Amblyseius) avetianae Arutujan et Ohandjanian, 1972 (10): 1 — dorsal shield; 2 — ventral body surface; 3 — metapodal plates; 4 — caudal part of peritremal shield;5 — chelicera; 6 — spermatheca; 7 — fragment of leg IV; 8 — chelicera; 9, 10 — spermatheca.