Lasioseius chaudhrii (Wu & Wang)

De Moraes, Gilberto J., Abo-Shnaf, Reham I. A., Pérez-Madruga, Yanebis, Sánchez, Leocadia, Karmakar, Krishna & Ho, Chyi-Chen, 2015, The Lasioseius phytoseioides species group (Acari: Blattisociidae): new characterisation, description of a new species, complementary notes on seven described species and a taxonomic key for the group, Zootaxa 3980 (1), pp. 1-41 : 6-12

Lasioseius chaudhrii (Wu & Wang)

( Figs 6–22 )

Gnorimus chaudhrii Wu & Wang, 1982: 134 .

Lasioseius parberlesei .— Tseng, 1989: 22 (possible misidentification: see remarks under L. parberlesei ); De Leon-Facundo & Corpuz-Raros, 2002: 44 (misidentification).

Lasioseius chaudhrii . — Zhang & Fan, 2010: 283.

Specimens examined. two females from citrus orchard weeds, collected by J.-I. Jie, at Mawei, Fuzhou, China, August 22, 2008; one female from citrus, collected by Y.-X. Zhang, at Mawei, Fuzhou, China, September 12, 2009; eight females and two males from rice plants, collected by J. de D. Moya Franco, at El Pozo, María Trinidad Sánchez, Dominican Republic, August 29, 2012; two females from hay and rice stubble, collected by L.A.C. Raros & R.S. Raros, at Pintor, Gamu, Isabela, Philippines, December 21, 1996 and January 4, 1998 (UPLBMNH-Aca Nr. 708-709); 19 females from Chrysanthemum sp., collected by R.C. Garcia, at Bahong, La Trinidad, Benguet, Philippines, September 2, 2001 (UPLBMNH-Aca Nr. 710-715); two females from Chrysanthemum sp., collected by L.N. Calleja, at Piamonte Garden, Tacloban, Leyete Island, Philippines, March 2, 2003 (UPLBMNH-Aca. Nr. 716); one female from litter, collected by R.C. Garcia, at Dulay Garden, Dila Bay, Laguna, Luzon Island, Philippines, March 6, 2003 (UPLBMNH-Aca. Nr. 717); 14 females and three males from Oryza sativa , collected by G.J. de Moraes, C.-C. Ho, M.-Y. Lin & C.-C. Chang, at Tainan, Taiwan, July 10, 2014.

Adult female (specimens measured: China—three, Dominican Republic—six, Philippines—five, Taiwanfive). Measurements of structures given in Table 1.

Dorsum of idiosoma ( Fig. 6 ): podonotal region of dorsal shield reticulate, with 12 pairs of setae (j2–j6, z2, z4, z5, s4, s5, r2, r3), two pairs of distinct lyrifissures and three pairs of pores. Opisthonotal region reticulate, with ten pairs of setae (J2, J4, J5, Z1, Z3–Z5, S3–S5), seven pairs of lyrifissures and three pairs of pores. All setae lightly serrate, except, J2 and r2, smooth; setae j4, j5, j6, J2, J4, J5 and r2 relatively short; other setae longer and relatively stout. Unsclerotised cuticle along lateral margins with four pairs of setae (r5, R1, R2 and R5), short and smooth.

Venter of idiosoma ( Figs 7–8 ): all setae aciculate and smooth, except JV5, distally serrate. Laciniae divided for about 71 (68–76)% of their total length. Presternal region transversely striate. Sternal shield with sparse lateral striae, three pairs of setae (st1–st3) and two pairs of lyrifissures. Metasternal plate rounded, bearing the fourth pair of sternal seta (st4) and a pair of lyrifissures (iv4). Genital shield with lateral striae, posterior margin truncate, bearing genital setae (st5); paragenital lyrifissures (iv5) on unsclerotised cuticle posterolateral to st5. Ventrianal shield subtriangular, reticulate, bearing six pairs of opisthogastric setae (JV1–JV4, ZV2, ZV3) in addition to the circum-anal setae, a pair of marginal lyrifissures anterolateral to Zv3 and a pair of marginal pores posterolateral to para-anal seta; anal opening small. Opisthogastric cuticle with a broken line between genital and ventrianal shields, and two pairs of metapodal plates, the anterior much smaller and elongate, the posterior rounded. Unsclerotised cuticle around ventrianal shield with four pairs of lyrifissures and seta JV5. Exopodal plate distinct from anterior margin of coxa II to posterior margin of coxa IV.

Peritrematic plate and peritreme ( Fig. 9 ): peritrematic plate fused with dorsal shield at level of j2 and broadly fused with exopodal plate beside coxa IV; with a pore in region between coxae I–II [gp1 of Lindquist & Moraza, 2009] and a lyrifissure and a pore in region between coxae II–III (ip1, gp2), two lyrifissures and a pore behind geographic regions.

Character 1 Female Male

Holotype 2 Dominican Republic China Philippines Taiwan Paratype 2 Dominican Republic Taiwan

L 385–430 392 (358–418) 399 (388–415) 388 (375–400) 383 (375–393) 280–290 288–293 290 (288–295)

W 210–250 226 (208–238) 224 (213–235) 231 (213–240) 225 (208–240) 160–175 185–118 181 (170–190) ......continued on the next page

......continued on the next page: length; W: width; shields: DS—dorsal, GS—genital, SS—sternal, SGS—sternogenital, VAS—ventrianal; NT: number of teeth, FD: fixed cheliceral digit; MD: movable cheliceral digit; 2from the original description ( Wu & Wang, 1982); 3absent.

stigma (ip2, ip3, gp2), and with a pore near posterior end [SJ, inguinal solenostome of Athias-Henriot, 1969, gv2 of Lindquist & Moraza, 2009]; peritreme extending forward to region between j2 setae.

Spermatheca ( Fig. 10 ): calyx of spermatheca trumpet-shaped; atrium swollen.

Gnathosoma ( Figs 11–13 ): general shape of chelicera as for the new characterisation of the phytoseioides group; fixed digit bearing 13 (11–15) teeth in addition to apical tooth; hyaline rim bearing 16 teeth; movable digit bearing three teeth in addition to the apical tooth. Anteromedian region of epistome convex and denticulate. Deutosternum with seven transverse lines of denticles; first (distal) to fifth with 4–8 denticles each; sixth and seventh with 14–18 denticles each.

Legs ( Fig. 14 ): leg pretarsi I–IV each with a pair of claws and pulvillus with three rounded lobules. Leg IV with three macrosetae on genu (ad2), basitarsus (pd3) and telotarsus (pd2), all smooth. Leg chaetotaxy (trochanter to tibia): I: 1, 0/1, 1/2,1; 2, 3/2, 2/1, 2; 2, 3/2, 3/1, 2; 2, 3/2, 3/1, 2; II: 1, 0/1, 0/2, 1; 2, 3/1, 2/2, 1; 2, 3/1, 2/1, 2; 2, 2/ 1, 2/1, 2; III: 1, 1/1, 0/1, 1; 1, 2/1, 1/0, 1; 2, 2/1, 2/1, 1; 2, 1/1, 2/1, 1; IV: 1, 1/1, 0/1, 1; 1, 2/1, 1/0, 1; 2, 2/1, 3/0, 1; 2, 1/1, 3/1, 2.

Adult male (specimens measured: Dominican Republic—two, Taiwan—three)

Measurements of structures given in Table 1.

Dorsum of idiosoma ( Fig. 15 ): podonotal and opisthonotal regions of the dorsal shield with reticulation and setation as in adult female. Relative lengths and shape of setae as in adult female. Lateral cuticle with two pairs of setae (r5 and R1), short and smooth.

Venter of idiosoma ( Figs 16–17 ): shape of setae as in adult female, except JV5, smooth to very lightly serrate. Laciniae divided for about 70% of their total length. Presternal region transversely striate. Sternogenital shield fused with whole endopodal shield, lightly sclerotised, with sparse striae along lateral margins and near posterior end, bearing five pairs of setae (st1–st5) and three pairs of lyrifissures. Ventrianal shield subtriangular with transversely elongate reticules, bearing five pairs of opisthogastric setae (JV1–JV3, JV5 and ZV3) in addition to the circum-anal setae, two pairs of lyrifissures (in transverse line with JV1 and posterolateral to ZV3) and a pair of marginal pores (posterolateral to para-anal setae); anal opening small. Exopodal plate distinct from anterior margin of coxa II to posterior margin of coxa IV.

Peritrematic plate and peritreme ( Fig. 18 ): peritrematic plate fused with dorsal shield at level of r2 and broadly fused with exopodal plate beside coxa IV; with a broad expansion between coxae II–III that bears a lyrifissure and a pore (ip1, gp2); two lyrifissures and a pore behind stigma (ip2, ip3, gp2), and with a pore near posterior end [SJ, inguinal solenostome of Athias-Henriot, 1969, gv2 of Lindquist & Moraza, 2009]; peritreme extending forward to region between j2 setae.

Gnathosoma ( Figs 19–21 ): general shape of chelicera similar as for the new characterisation of the phytoseioides group; fixed digit bearing ten (9 – 10) teeth in addition to apical tooth; movable digit bearing one tooth in addition to the apical tooth and a slightly wavy spermadactyl, with a small and slender distal process. Anteromedian region of epistome as in adult female. Hypostome similar to female.

Legs ( Fig. 22 ): legs similar to female. Leg IV with three macrosetae on genu (ad2), basitarsus (pd3) and telotarsus (pd2), all smooth. Leg chaetotaxy as in adult female.

Remarks. Measurements of specimens from different regions are very similar to each other. An examination of specimens reported by De Leon-Facundo & Corpuz-Raros (2002) and Corpuz-Raros et al. (2005) as L. parberlesei , kindly provided by L. Corpuz-Raros and I.L. Lit Jr., led us to re-identify them as L. chaudhrii .

Figures

FIGURES 6 – 14. Lasioseius chaudhrii. Female: Specimens from the Dominican Republic: 6. Dorsal shield; 7. Tritosternum; 8. Ventral shields; 9. Peritrematic plate; 10. Spermatheca; 11. Chelicera; 12. Epistome; 13. Hypostome; 14. Leg IV.

FIGURES 15 – 22. Lasioseius chaudhrii. Male: Specimens from the Dominican Republic: 15. Dorsal shield; 16. Tritosternum; 17. Ventral shields; 18. Peritrematic plate; 19. Spermadactyl; 20. Epistome; 21. Hypostome; 22. Leg IV.