Hypoaspis integer Berlese, 1911

Trach, V. A. & Joharchi, O., 2018, Mites Of The Family Laelapidae (Acari, Mesostigmata) Associated With Scarab Beetles In Ukraine, Vestnik Zoologii 52 (3), pp. 217-228 : 219-224

Hypoaspis integer Berlese, 1911

Hypoaspis integer Berlese, 1911: 186 .

Material. Ukraine, Odesa Region, Kiliya District, vicinity of Primorske (45.53 N, 29.67 E), meadow, on Polyphylla fullo , 15.07.2002, 3 ♀ (M. O. Son); Bilgorod-Dnistrovsky District , vicinity of Zatoka (46.02 N, 30.40 E), Black Sea Coast, on P. fullo , 4.07.2010, 11 ♀, 2 Ơ ( V. A. Trach) .

D i s t r i b u t i o n. Czech Republic (Costa, 1971); France ( Samšiňák, 1960); Germany (Costa, 1971); Kyrgyzstan ( Karg, Rössner, 1999); Poland ( Haitlinger, 2012); “Prussia” (Costa, 1971); ”Southern Russia ” (possibly Ukraine) (Costa, 1971); Spain ( Karg, Rössner, 1999); Ukraine (first record).

Hosts. Oryctes nasicornis (Linnaeus, 1758) ( Berlese, 1911; Samšiňák, 1960; Costa, 1971); Polyphylla fullo (Costa, 1971; Karg, Rössner, 1999; Haitlinger, 2012; this study); P. tridentata Reitter, 1890 ( Karg, Rössner, 1999).

Redescription. Adult female (n = 5) ( figs 1–9 )

Idiosomal dorsum ( fig. 1 ). Dorsal shield oval; 828–911 long and 409–493 maximum width at r5; shield smooth in central part and reticulate along antero-lateral and post-lateral margins. Dorsal shield with 38 (or 39) pairs of setae; 21 (or 22) pairs of setae on podonotal shield (j1–j6, z1–z5, s1–s6, r3–r6), seta z6 bilaterally present in 1 specimens, unilaterally present in 3 and completely absent in 7 from investigated 11 mites; 17 pairs of setae on opisthonotal shield (J1–J5, Z1–Z5, S1–S5 and 2 pairs of Zx setae) and 21 pairs of distinguishable pores. Soft cuticle with setae R1 – R7 . All dorsal setae smooth and pointed; setae Z4, R6 and R7 wavy; seta Z4 longest; measurements of some setae: j1 63–92, j6 71–84, J5 38–59, z1 25–34, z4 151–197, Z1 63–76, Z5 101–113, s5 143–176, R5 105–160, R6 210–252, R7 147–189.

Idiosomal venter ( fig. 2 ). Tritosternum with paired pilose laciniae, base elongated, 50–59 long, 25–29 wide at base, laciniae free for most of total length (134–151), and fused for 13–21 long. Pre-sternal area weakly sclerotised. Sternal shield fused with endopodal platelets of coxae I/II and coxae II/III; 126–139 long midline, 185–218 wide at level of endopodal platelets of coxae I/II, 210–239 wide at level of endopodal platelets of coxae II/III, 118–130 wide at narrowest level between coxae II; with slightly concave anterior margin and concave irregular posterior margin; with 3 pairs of setae (st1 46–55, st2 46–59, st3 42–55), setae st1 and st2 not reach base of next posterior setae; sternal shield bearing 2 or 3 pairs of pores (iv1, iv2 located on shield, iv3 located on shield or on soft cuticle); surface of shield with reticulation. Metasternal platelets absent; setae st4 (42–50) located on soft cuticle. Endopodal platelets formed between coxae III and IV. Genital shield tongue-shaped; length 269–319, maximum width 126–151, posterior margin rounded, surface with reticulate ornamentation, genital setae st5 (38–46) on edge of the shield; genital pores placed off shield. Parapodal platelets free. Anal shield rounded triangular; 126–134 long and 92–109 maximum wide; smooth; bearing pair of para-anal setae (46–59) and unpaired post-anal seta (43–42); cribrum well developed. Soft cuticle around of anal shield with 2–3 pairs of elongate metapodal platelets, 13 pairs of setae (JV1–JV5, ZV1–ZV4, 2 pairs setae of UR - series) and 5 pairs of distinguishable pores. All ventral setae smooth and pointed; setae JV4 and JV5 wavy; measurements of some setae: JV1-JV3, ZV1-ZV3 50–92, JV4 105–139, JV5 210–286, ZV4 147–210, UR 84–147. Peritrematal shields free from exopodal plate; with 5 pairs of distinguishable pores; peritreme extending from anterior margin of coxa IV to mid-level of coxa I. Spermathecal apparatus not seen.

Gnathosoma ( figs 3–6 ). Epistome triangular, irregularly denticulate ( fig. 3 ). Subcapitulum 185–227 wide at widest level. Hypostomal groove with 6 rows of 12–20 denticles, and smooth anterior and posterior transverse lines ( fig. 4 ). Hypostome with 4 pairs of smooth and pointed setae; seta hp3 longest (97–105), pc 38–55, hp1 34–50, hp2 38–50. Corniculi entire, symmetrical, robust and horn-like, reaching mid-level of palp femur. Internal malae with two pairs of lobes; inner lobes longer, pointed, with serrated edges, projecting beyond tips of corniculi; outer lobes shorter than corniculi, with serrated edges. Labrum strongly projecting beyond tips of internal malae. Palp length from trochanter to tarsus 252–277; setal formula: 2–5–6–14–15; palpfemoral seta al, palpgenual setae al1 and al2 weakly spatulate, palptarsal apotele 2-tined, other setae simple ( figs 4, 5 ). Fixed cheliceral digit with large median and preapical teeth, small 10–15 teeth, pilus dentilis, curved dorsal seta, dorsal and lateral pores; movable digit with 2 large teeth and fringed arthrodial corona; second cheliceral segment length 218–231 (from base to apex of fixed digit), movable digit length 92–105 ( fig. 6 ).

Legs ( figs 7–9 ). Lengths: I 725–809, II 586–688, III 623–763, IV 846–1042. Leg chaetotactic formulae normal for genus: leg I: coxa 2 (0 0/1 0/1 0), trochanter 6 (1 0/1 1/2 1), femur 13 (2 3/1 2/3 2), genu 13 (2 3/2 3/1 2), tibia 13 (2 3/2 3/1 2); leg II: coxa 2 (0 0/1 0/1 0), trochanter 5 (1 0/1 0/2 1), femur 11 (2 3/1 2/2 1), genu 11 (2 3/1 2/1 2), tibia 10 (2 2/1 2/1 2); leg III: coxa 2 (0 0/1 0/1 0), trochanter 5 (1 1/1 0/2 0), femur 6 (1 2/1 1/0 1), genu 9 (2 2/1 2/1 1), tibia 8 (2 1/1 2/1 1); leg IV: coxa 1 (0 0/1 0/0 0), trochanter 5 (1 1/1 0/2 0), femur 6 (1 2/1 1/0 1), genu 9 (2 2/1 3/0 1), tibia 10 (2 1/1 3/1 2). Tarsi II–IV with 18 setae (3 3/2 1/1 3/2 3). Macrosetae present on femur II (pd1 202–294), femur III (ad1 218–302), genu III (ad1 92–176, pd1 105–164), femur IV (ad1 302–416), genu IV (ad1 239–290, ad2 88–122, pd1 139–193), tarsus IV (ad2 172–185, pd2 147–218, pd3 202–244). All setae smooth. Setae av on genu II, av, pv on tibia II, av2, mv, pv2 on tarsus II, av, pv on genu III, av, pv, pl on tibia III, av2, mv, pv2 on tarsus III, av on genu IV, av, pv, pl1 on tibia IV, av1, av2, mv, pv1, pv2, pl1, pl2, pl3 on tarsus IV thickened. Setae al1 and pl1 on tarsus II blunt and thickened. All pre-tarsi with pair of claws and thin membranous ambulacrum.

Adult male (n = 2) ( figs 10–12 ).

Idiosomal dorsum. As in female. Dorsal shield 725–809 long and 400–419 maximum width at r5.

Idiosomal venter ( fig. 10 ). Tritosternum as in female, 151–160 long. Pre-sternal area weakly sclerotised. Sternal shield, genital shield, endopodal and parapodal platelets fused into a single reticulate plate, posterior margin of this shield concave and irregular; 399– 407 long midline; bearing 8–9 pairs of setae (st1–st5, JV1, ZV1, ZV2; seta JV2 may be absent or placed off shield) and 4 pairs of distinguishable pores. Anal shield free, rounded triangular; 113–118 long and 80–97 maximum wide; smooth; bearing one pair of para-anal setae, and unpaired post-anal seta; cribrum well developed. Soft cuticle around of anal shield with 2 pairs of elongate metapodal platelets, 6 pairs of setae (JV3–JV5, ZV3, ZV4, UR) and 3 pairs of distinguishable pores. All ventral setae smooth and pointed; setae JV5 and ZV5 wavy; measurements of ventral setae: st1–st5 34–46, JV1-JV3, ZV1-ZV3 38–71, JV4 118– 151, JV5 244–273, ZV4 172–181, UR 59–71. Peritrematal shields as in female.

Gnathosoma. Fixed cheliceral digit with one large median tooth; movable digit with one large preapical tooth, 0–2 small teeth and long slender spermatodactyl; second cheliceral segment length 172–181, movable digit length 63–67 excluding spermatodactyl and 126–134 including spermatodactyl ( fig. 11 ). Other details as in female.

Legs. Lengths (from base of coxa to apex of tarsus, excluding ambulacrum): I 651–707, II 549–605, III 623–651, IV 828–902. Legs chaetotaxy and macrosetae as in female. Ventral setae on femur–tarsus II more thickened than in female, especially seta pv1 on femur II ( fig. 12 ). Setae av, pv on genu III, av, pv, pl on tibia III, av2, mv, pv2, al1 on tarsus III, av on genu IV, av, pv, pl1 on tibia IV, av2, mv, pv2, pl2, pl3 on tarsus IV thickened. Setae al1, pl1 on tarsus II and seta pl1 on tarsus III blunt and thickened.

Remarks. Females and males Hypoaspis integer display morphological variability (Costa, 1971). Thus, the seta z6 is often absent on the dorsal shield. Our data agree with the data of the previous study ( table 1). Costa (1971) noted that only one of the 14 studied male specimens had a free anal shield. Both our specimens do not have a free anal shield.

From other Ukrainian species of the genus Hypoaspis , H. integer differs by the presence on genu IV three long macrosetae (ad1, ad2, pd1), other species have one relatively short macroseta ad1.

Figures

Figs 1–6. Hypoaspis integer, ♀: 1 — idiosoma, dorsal view; 2 — idiosoma, ventral view; 3 — epistome; 4 — subcapitulum and palp (from trochanter to genu), ventral view; 5 — palptibia and palptarsus, dorsal view; 6 — chelicera. Scale bars 100 μm.

Figs 7–9. Hypoaspis integer, ♀: 7–9 — legs II–IV, respectively, ventral view. Scale bar 200 μm.

Figs 10–12. Hypoaspis integer, Ơ: 10 — idiosoma, ventral view; 11 — chelicera; 12 — femur II, lateral view. Scale bars 100 μm.