Two new species of eriophyoid mites (Acari: Eriophyoidea) from grasses in Poland
Skoracka, Anna
Zootaxa
2002
54
1
15
[264,514,1004,1030]
Arachnida
Eriophyidae
Abacarus
Animalia
Prostigmata
5
6
Arthropoda
species
longilobus
sp. nov.
Description: Female ( Figs 34) ( holotypeand 9 paratypes): body length 238 (185296), width 62 (5767), body spindleform. Dorsomedian ridge narrow, ending near 16th dorsal annulus from end, dorsal furrow and lateral ridges ending near 67th annulus from end. Gnathosoma 25 (2230) long; dorsal pedipalpal genual setae d11 (1012) long; vsetae (sensory peg) 3 (23) long; epsetae 2 (23) long, chelicerae 22 (1923) long, almost straight. Prodorsal shield elongatetriangular, 53 (4757), long; 47 (4452) wide, with pronounced, elongated frontal lobe over gnathosoma, 17 long. Sculpture of prodorsal shield: median line absent; admedian lines present only on posterior half of shield, parallel to each other; submedian lines entire only on anterior 1/3 and posterior 1/6 part of shield, parallel to lateral margins of shield. Distinct, conical microtubercles present on surface near shield. Tubercles of setae sclocated on rear margin of shield, 2 (23) long, 3 (34) wide, 31 (27 31) apart; setae sc13 (812) long, projecting to rear. Leg I 40(3646) long; femur 10 (1011) long, with seta bv15 (1215) long; position of seta bv4 (4) from ventral, proximal margin of femur; genu 6 (67) long, with seta l’’26 (2230) long, position of seta l’’4 (4) from dorsal, proximal margin of genu; tibia 8 (89) long, with seta l’10 (1011) long; position of seta l’5 (45) from ventral, proximal margin of tibia. Tarsus 8 (89) long, with three setae: ft’’30 (2530) long; ft’28 (2127) long, u’7 (57) long; tarsal solenidion 10 (910) long; tarsal empodium simple, 8 (89)rayed, symmetrical, 10 (1012) long. FIGURE 3. Abacarus longilobus n. sp.– female: dorsal aspect; IG – internal genitalia; DO – dorsal microtubercles; PV posteroventral view. FIGURE 4. Abacarus longilobus n. sp.– female: CG – coxogenital region; L1, L2 – legs I and II. Leg II 40(3641) long; femur 11 (1012) long, with seta bv21 (1720) long; position of seta bv5 (45) from ventral, proximal margin of femur; genu 5 (56) long, with seta l’’12 (1217) long; position of seta l’’3 (34) from dorsal, proximal margin of genu; tibia 7 (67) long. Tarsus 8 (89) long, with three setae: ft’’28 (2227) long, ft’12 (1014) long, u’6 (67) long; tarsal solenidion 10 (1011) long; tarsal empodium 8 (89)rayed, symmetrical, 10 (1012) long. Coxae with a pattern of numerous lines and dashes, some lines with microtubercles; slender sternal line present. Setae 1b10 (1012) apart, 11 (1113) long; setae 1a9 (79) apart, 29 (2428) long; setae 2a25 (2227) apart, 53 (4652) long; distance between setae 1band 1a7 (78), distance between setae 1aand 2a9 (810). Opisthosoma with 73 (6674) dorsal annuli, 78 (6881) ventral annuli, 6 (57) coxogenital annuli. Annuli with microtubercles; ventral microtubercles minute, conical and pointed, from level of setae felongated; microtuberles on dorsal annuli beadlike, present only on ridges. Setae c247 (3848) long, located on 10th (8th–10th) ventral annulus from coxae II; tubercles c263 (4864) apart; ventral setae d67 (4367) long, located on 26th (21st–28th) ventral annulus; tubercles d36 (3340) apart; setae e48 (3046) long, located on 47th (40th–48th) ventral annulus; tubercles e13 (1116) apart; setae f40 (2538) long, located on 74th (64th–77th) ventral annulus, 5th (5th) annulus from rear; tubercles f25 (2325) apart. Setae h15 (56) long, 8 (68) apart; setae h283 (7298) long, 13 (1113) apart; distance between h1and h2 –2 (23). Genital parts 17 (1619) long, 24 (2327) wide, genital coverflap with 11 (1012) longitudinal striae; setae 3a40 (3043) long, 14 (1317) apart. Male ( Fig. 5) ( 10 specimens): body length 178221; body width 4660, spindleform; dorsomedian ridge shorter than in female. Gnathosoma 1726 long; dorsal pedipalpal genual seta d810 long; vsetae (sensory peg) 2 long; epsetae 23 long chelicerae 1423 long, almost straight. Prodorsal shield elongatetriangular, 4649 long; 3846 wide, with pronounced, elongate frontal lobe over gnathosoma, which is shorter than those in female; pattern of shield similar to that of a female. Tubercles of setae sclocated on the rear margin of shield, 23 long, 3 wide, 2430 apart; setae sc911 long, projecting to rear. Leg I 3237 long; femur 810 long, with seta bv814 long; position of seta bv34 from ventral, proximal margin of femur; genu 56 long, with seta l’’2029 long; position of seta l’’34 from dorsal, proximal margin of genu; tibia 68 long, with seta l’810 long; position of seta l’35 from ventral, proximal margin of tibia. Tarsus 78 long, with three setae: ft’’2229 long, ft’1823 long, u’57 long; tarsal solenidion 810 long; tarsal empodium simple, 78rayed, symmetrical, 911 long. Leg II 3135long; femur 910 long, with seta bv1518 long; position of seta bv35 from ventral proximal margin of femur; genu 45 long, with seta l’’1015 long; position of seta l’’23 from dorsal, proximal margin of genu; tibia 57 long. Tarsus 7 long, with three setae: ft’’2128 long, ft’1012 long, u’57 long; tarsal solenidion 810 long; tarsal empodium 78rayed, symmetrical, 910 long. FIGURE 5. Abacarus longilobus n. sp.– male: GM – coxogenital region. Coxae with a pattern of lines and microtubercles on coxae I, dashes on coxae II. Setae 1b910 apart, 710 long; setae 1a69 apart, 1929 long; setae 2a1921 apart, 4052 long; distance between setae 1band 1a68, distance between setae 1aand 2a79. Opisthosoma with 5765 dorsal annuli, 5869 ventral annuli, 57 coxogenital annuli. Annuli with microtubercles; dorsal microtubercels similar to that of female; ventral microtubercles tiny, conical, pointed. Setae c23646 long, located on 7th9th ventral annulus from coxae II; tubercles c245 51 apart; ventral setae d6267 long, located on 18th22nd ventral annulus; tubercles d26 29 apart; setae e2440 long, located on 33rd38th ventral annulus; tubercles e1014 apart; setae f2741 long, located on 54th65th ventral annulus, 5th annulus from rear; tubercles f1924 apart. Setae h145 long, 67 apart; setae h26781 long, 1011 apart; distance between h1and h2 –2. Genital parts 1417 long, 1921 wide; setae 3a2632 long, 1417 apart; granulated. Nymph ( Fig. 6) ( 6 specimens): body length 162206; body width 4460; spindleform. Dorsomedial ridge slender, ending near 67th annulus from end. Gnathosoma 1626 long; dorsal pedipalpal genual seta d68 long; vsetae (sensory peg) 2 long; epsetae 3 long; chelicerae 1720. Prodorsal shield with a elongated lobe over base of chelicerae; shield triangular, its posterior margin bowed; 3741 long, 3544 wide. Sculpture of prodorsal shield: median line absent; admedian lines parallel to each other near; submedian lines parallel to lateral margins of shield. Conical microtubercles present on surface near shield. Tubercles of setae sc23 long, 24 wide, located on rear margin of shield, 2226 apart; setae sc710 long. Leg I 2735long; femur 69 long, with seta bv79 long; position of seta bv34 from ventral, proximal margin of femur; genu 45 long, with seta l’’1825 long; position of seta l’’23 from dorsal, proximal margin of genu; tibia 56 long, with seta l’710 long; position of seta l’2.53 from ventral, proximal margin of tibia. Tarsus 56 long, with three setae: ft’’1823 long; ft’1418 long, u’46 long; tarsal solenidion 68 long; tarsal empodium simple, 67rayed, symmetrical, 79 long. Leg II 2332long; femur 68 long, with seta bv1113 long; position of seta bv34 from ventral, proximal margin of femur; genu 45 long, with seta l’’810 long; position of seta l’’23 from dorsal, proximal margin of genu; tibia 34 long. Tarsus 56 long, with three setae: ft’’1720 long, ft’78 long, u’46 long; tarsal solenidion 69 long; tarsal empodium 67rayed, symmetrical, 79 long. Coxae with a pattern of short, slender lines and conical microtubercles. Setae 1b911 apart, 6 long; setae 1a78 apart; setae 2a2024 apart, 3035 long; distance between setae 1band 1a68, distance between setae 1aand 2a78. Opisthosoma with 4764 dorsal annuli, 4560 ventral annuli, 78 coxogenital annuli. Annuli with microtubercles; dorsal microtubercles sparse on ridge, beadlike, near ridge conical, pointed; ventral microtubercles conical, larger than dorsal. Setae c 22432 long, located on 6th 9th ventral annulus from coxae II; tubercles c240 54 apart; ventral setae d2938 long, located on 15th–21st ventral annulus; tubercles d2532 apart; setae e1025 long, located on 2636 ventral annulus; tubercles e1116 apart; setae f1927 long, located on 41st 56th ventral annulus, 5th annulus from rear; tubercles f1822 apart. Setae h124 long, 56 apart; setae h 2910 apart; distance between h1and h2 –2. Setae 3a813 long, 810 apart. Larva not seen. Etymology: the specific designation is derived from the combination of words: longus(Latin) – long and lobus, because of the very long lobe of the prodorsal shield over the gnathosoma in this species. Host plant: Bromus inermisLeyss. (Poaceae). FIGURE 6. Abacarus longilobus n. sp.– nymph: dorsal aspect; DO dorsal microtubercles; VO ventral microtubercles. Relation to host plant: mites are vagrants on both leaf surfaces. Typelocality: Poland, Poznañ, Cytadela ( 16° 56' E; 52° 25' N); scarp, southern exposition; 20.06.1999; leg. A. Skoracka. Material examined: holotypefemale (ABALON248F7), 20 femalepartypes (ABA LON248F16, ABALON248F819), 14 males(ABALON248M114), 17 nymphs (ABA LON248N117). Differential diagnosis: The new species is most similar to Abacarus stadelbacheri Petanovic, 1993(from Geranium dissectumL., Geraniaceae, Italy) by the shape of the lobe over the gnathosoma, coxae ornamentation and appearance of dorsal microtubercles. Both species have similar numbers of annuli: dorsal ( 72 in A. stadelbacheri, 73 in A. longilobus) and ventral ( 80 in A. stadelbacheri, 78 in A. longilobus), width of genitalia ( 24 inboth species) and distance between 3a setae ( 14 inboth species). A. longilobuscan be distinguished from A stadelbacheriby the sculpture of the prodorsal shield and length of the dorsomedian ridge. In A. stadelbacherion the prodorsal shield are long admedian lines and the dorsomedian ridge is ending near ½ of the opisthosoma. In A. longilobusdorsomedian ridge is longer, the admedian lines are present only on the posterior part of the shield, and the submedian lines are also present. Besides, those two species differ in the width of the prodorsal shield ( 56 in A. stadelbacheri, 47 in A. longilobus), numbers of empodial rays ( 7 in A. stadelbacheri, 8 in A. longilobus), length of opisthosomal setae d: ( 38 in A. stadelbacheri, 67 in A. longilobus), e( 16 in A. stadelbacheri, 48 in A. longilobus), f( 25 in A. stadelbacheri, 40 in A. longilobus), 3a( 19 in A. stadelbacheri, 40 in A. longilobus). Notice: This species was also found on three other Poaceaespecies: Agropyron repens(L.) P. B., Arrhenantherum elatius(L.) P. Beauv. ex J. Presl & C. and Bromus erectusHuds.The greatest intensity of its infestation was on B. inermis–49.6 (n = 7; 95% CI: 20.7 – 101.3) and on A. elatius–44.5 (n = 8; 18.5 – 97.0) specimens per stem. On other plants the mean number of specimens per stem was considerable lower: on A. repens–7.3 (n = 13; 2.0 – 20.3), on B. erectus–10.8 (n = 10; 3.6 – 28.9).