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).