Neoseiulus brachychaetus Kolodochka, 2018

Kolodochka, L. A., 2018, Two New Species Of The Genus Neoseiulus (Parasitiformes, Phytoseiidae) With Redescriptions Of N. Bicaudus And N. Micmac Based On Holotypes, Vestnik Zoologii (Vestn. Zool.) 52 (4), pp. 295-306 : 301-303

Neoseiulus brachychaetus Kolodochka , sp. n. ( fig. 4 )

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T y p e m a t e r i a l. Holotype ♀: # 1, Russia, [environs of] Volgograd, [48°41´N, 44°28´E], on cane ( Phragmites ), in colony of tarsonemid mite Steneotarsonemus panshini , # 4735 a, 04.04.1972 (A. Badulin) ( SIZK).

Paratypes: 5 ♀ on the same slide with holotype; 6 ♀, from the same sample with holotype, # 4735 b ; 29 ♀, 4 Ơ, same location, on cane, # 5715, 5717, 5719, 5728, 5934, 08.08.1973; 1 Ơ (illustrated), same location in colony of tarsonemid mites, # 5716, 08.08.1973 (A. Badulin) ( SIZK) .

D e s c r i p t i o n. Female (holotype). Dorsal shield ( fig. 4 , A) weakly sclerotized, elongate-oval, with constrictions on level of R1, reticulation in posterior part feebly marked, with 7 pairs of distinct solenostomes (gd1, gd2, gd4, gd5, gd6, gd8, and gd9), 16 pairs of poroids, and 17 pairs distinctly short setae acute, smooth, thin, and slightly different in length except Z5 elongated and weekly serrated. Setae J5 short. Seta j3 shorter than distance its base and base of seta z2. Setae z2 and z4 each one-third of distance to base of next seta. Seta S5 slightly longer than other postlateral setae in row Z1, S2, S4, and S5. Seta Z4 equal to distance between its base and solenostome gd9 and shorter than distance to base of seta S5.

All ventral setae thin, acute, and smooth including JV5. Sternal shield with 3 pairs of setae (St1–St3) and 2 pairs of lyrifissures. Setae St4 on separate metasernal platelets each with pore. Ventrianal shield wider than genital shield, elongated, near pentagonal in form with convex anterior margin, lateral margins with slight constrictions, all striated ( fig. 3 , B). Narrow transversal sclerotized stria between genital and ventrianal shields. One pair narrow straight-line plates posteroparaxially to setae ZV1. Three pairs of short pre-anal setae JV1, JV2, ZV2 on ventrianal shield. Pre-anal solenostomes (gv3) minute and widely disposed. Setae ZV1, ZV3, JV4 and JV5 on the integument surrounding the ventrianal shield, 4 pairs of small oval platelets on the integument surrounding the ventrianal shield ( fig. 4 , B).

Chelicera normal in size. Fixed digit with 9 denticles, movable digit with 2 (proximal minute) pointed tooth ( fig. 4 , C). Metapodal plate elongate and narrow, anterior platelet very small and narrow ( fig. 4 , D). Infundibulum of spermatheca of moderate size, cupshaped with moderately thickened wall, atrium on cervix ( fig. 4 , E 1 , E 2 ). Peritreme long, extending beyond base of seta j3 ( fig. 4 , A). Posterior part of peritremal shield narrow, curved with acute end ( fig. 4 , F). Leg IV with a single long and acute macrosetae on basitarsus; tibia and genu without macrosetae ( fig. 4 , G). No macrosetae on other legs. Genu II with 7 setae (2 al –2 ad, 2 pd / 0 av, 0 pv –1 pl). Seta al2 somewhat shorter than other setae on genu II ( fig. 4 , H).

Measurements. Length of dorsal shield from j1 to end of shield, Lds 390; width of dorsal shield, Wds 160; length of ventrianal shield, Lvas 130; max width of ventrianal shield, Wvas 102; distance between pre-anal solenostomes gv3, Lgv3 40; length of tarsus of leg IV, Ltar IV 94. Length of setae: j1 20, j3 20, j4 12, j5 11, j6 9, J2 13, J5 13, s4 33, z2 15, z4 13, z5 9, S2 26, S4 28, S5 36, Z1 17, Z4 30, Z5 78, r3 25, R1 23, JV5 46; macroseta on leg IV: tar 62.

Male. Dorsal setal pattern as in female in general. Ventrianal shield with 3 pairs of pre-anal setae; solenostomes gv3 pointed and widely placed, disposed posteroparaxially of setae JV2; fixed digit of chelicerae with 5 denticles, movable digit with 1 denticle, spermatodactyle L-shaped ( fig. 4 , I). Ventrianal shield reticulated with 3 pairs of setae and one pair of small round pre-anal solenostomes gv3.

Neoseiulus brachychaetus sp. n. resembles N. bicaudus in elongated dorsal shield; form of ventrianal shield; and small pre-anal solenostomes gv3. New species differs from the latter by dorsal setae (besides Z5) distinctly short; setae JV5 smooth and comparatively short, only 1 macrosetae on leg IV, by 9 denticles on fixed digit of chelicera; against 6 denticles on fixed digit of chelicerae, setae JV5 long and serrate, and 3 macrosetae on leg IV in N. bicaudus . Males of two species have different form of spermatodactyl.

A key to Neoseiulus species similar to N. bicaudus

1. Seven pairs of solenostomes (gd1, gd2, gd4, gd5, gd6, gd8, gd9) on dorsal shield. ..................................... 2

— Less than seven pairs of solenostomes on dorsal shield. ............................................................................... 3

2 Dorsal setae z2 half as long as distance z2–z4; leg IV with three macrosetae (on basitarsus longest, on tibia and genu shorter); setae JV5 serrated. .................................................. N. bicaudus ( Wainstein, 1962)

— Dorsal setae z2 one third as long as distance z2–z4; leg IV with one long macrosetae (on basitarsus); setae JV5 smooth. .......................................................................................................... N. brachychaetus sp. n.

3 Six pairs of dorsal solenostomes. ..................................................................................................................... 4

— Less than six pairs of dorsal solenostomes. ..................................................................................................... 7

4 Dorsal solenostomes gd2 or gd4 absent...........................................................................................................5

— Dorsal solenostomes gd5 absent. ...................................................................................................................... 6

5 Dorsal solenostomes gd2 absent; pre-anal solenostomes gv3 on ventrianal shield rounded, very small and associated with setae JV2; Df with 9 denticles (2 subapical and 7 median)............................................ ...................................................................................................................... N. micmac (Cant & Hansell, 1971) .

— Dorsal solenostomes gd4 absent; pre-anal solenostomes gv3 on ventrianal shield crescentic and approximate; Df with 4 subapical denticles. .......................................................... N. dissipatus ( Kolodochka, 1991)

6 Setae J5 long (27 μm) and serrated; pre-anal solenostomes gv3 minute and widely disposed; Df with 7 denticles, Dm with 1 denticle. ................................................. N. ponticus Kolodochka & Bondarev, 2017

— Setae J5 short (13 μm) and smooth; pre-anal solenostomes gv3 crescentic and approximated; Df with 9 denticles, Dm with 2 denticles. ................................................................................. N. neoparaki Ehara 1972

7 Five pairs of dorsal solenostomes (gd4 and gd5 absent); infundibulum of spermatheca rather cylindrical with thin wall; Df with 4 denticles (3 subapical and 1 basal). ............... N. perspectus ( Kolodochka, 1992)

— Four pairs of dorsal solenostomes (gd4, gd5, and gd8 absent); infundibulum of spermatheca bell-shaped with thickened wall; Df with 5 denticles. ................................. N. probatus Kolodochka & Bondarev, 2017

Figures

Fig. 4. Neoseiulus brachychaetus Kolodochka, sp. n. Female: A — dorsal shield; B — fragment of ventral body surface; C — chelicera; D — metapodal plates; E1, E2— spermatheca; F — caudal part of peritremal shield; G — fragment of leg IV; H — genu II (setal abbreviation the same on fig. 1). Male: I — chelicera.

Fig. 3. Neoseiulus micmac (Chant et Hansell). Female: A— dorsal shield; B — setae J5; C — fragment of ventral body surface; D 13–14, chelicerae (D — moveable digit; D — fixed digit); E — metapodal plates; F — spermatheca; G — caudal part of peritremal shield; H — fragment of leg IV.

Fig. 1. Neoseiulus bicaudus (Wainstein). Female:A — dorsal shield; B — setae J5; C — fragment of ventral body surface; D —chelicera; E — metapodal plates; F — spermatheca; G — caudal part of peritremal shield; H — fragment of leg IV; I, genu II (setal abbreviation: ad — antero-dorsal, pd — post-dorsal; al — antero-lateral, pl — post-lateral; av — antero-ventral).

Fig. 2. Neoseiulus bicaudus (Wainstein). Male: A — chelicera; B — ventrianal shield.