A new species of Abacarus Keifer (Acari: Eriophyidae) from Brazil Author Flechtmann, Carlos Holger Wenzel Author Tassi, Aline Daniele text Papéis Avulsos de Zoologia 2021 Pap. Avulsos Zool., S. Paulo 2021-09-27 61 1 8 http://dx.doi.org/10.11606/1807-0205/2021.61.80 journal article 10.11606/1807-0205/2021.61.80 1807-0205 7177121 C130E57D-D367-4878-9896-FA8968570C0C Abacarus zoysiae sp. nov. ( Figs. 1-7 ) Holotype : female, Brazil , São Paulo , Ribeirão Preto ( 21°11′35.3″S , 47°48′03.2″W ), col. Flávio Figueiredo , 25 Sep 2020 . Figure 1. Abacarus zoysiae sp. nov. (A,B) Scanning electron micrographs (SEM) of dorsal view of specimens covered with wax-like secretion.Scale bar:2 µm. Paratypes : 24 female , 10 males on 14 microscopic preparations, collected with holotype , same locality and collector as holotype . Diagnosis The new species is unique in presenting the prodorsal shield shaped as the profile of a five-sided diamond in dorsal view, with a prominent frontal lobe containing eight irregular longitudinal ridges. Shield ornamentation only represented by two admedian lines.With three coxigenital annuli and a short opisthosomal ventral seta II, e, 5-7 long. Description Female (N = 6): Body elongate, 182 (171-202) length, 43 (41-50) wide, whitish, frequently covered with abundant white wax-like secretion ( Figs. 1A, 1B and 7 ). Gnathosoma: projecting obliquely downwards, basal pedipalp coxal seta ( ep ) 4 (3-4), apical dorsal pedipalp genual seta ( d ), 5 (5-6), chelicerae 18 (16-18). Prodorsal shield: a five-sided diamond shaped in dorsal view, 40 (38-43) length, 39 (35-43) wide, prominent frontal lobe with 8 (8) longitudinal, irregular, scorings ( Fig. 2 ). Shield ornamentation limited to two sub-median, parallel lines, with a slight median constriction, extending over entire shield length; otherwise smooth. With elongate anterolateral scorings. Scapular seta tubercles on shield rear margin, 22 (22-23) apart; scapular setae, ( sc ) 9 (9-10), projecting backwards, extending over 4 (4-5) dorsal opisthosomal annuli. Coxisternal region: coxisternal plates and cervical plate with a few scattered elongate coarse dashes. Coxal seta I, 1b, 7 (6-8), 11 (9-11) apart; coxal seta II, 1a, 13 (11-13), 4 (5-6) apart; coxal seta III, 2a, 21 (21-27), 19 (19-22) apart; internal coxisternal apodeme (sternal line) 7 (7). Coxisternal annuli 3 (3), with fine, elongate, faint delicate microtubercles ( Figs. 3B and 5B ). Opisthosoma: annuli about equal dorso-ventrally. Dorsal annuli with three longitudinal ridges: middorsal ridge ending about 13 th annulus from rear and extending in a short trough; lateral ridges ending at about 10 th annulus from rear. Caudal 9-10 dorsal annuli evenly arched. Dorsal annuli smooth, without microtubercles.Total dorsal annuli, 54 (54-60).Total ventral annuli, 52 (52-60),with narrow microtubercles, short in anterior annuli and becoming increasingly longer caudally. Lateral seta ( c2 ) 40 (22-40), on annulus 3 (2-3) counting from genitalia rear margin. Ventral seta I ( d ) 36 (32-44), 27 (27-31) apart, on annulus 12 (12-14); ventral seta II ( e ) 6 (5-7), 12 (10-13) apart, on annulus 28 (28-35); ventral seta III ( f ) 24 (19-25), 19 (18-21) apart, on annulus 47 (47-56) or fifth from rear. Accessory seta ( h1 ) 4 (4-5), caudal seta, h2, 40 (38-47). Genitalia 18 (18), 19 (19-10) wide, coverflap basally with two transverse lines of small beadlike granules and one line of larger, elongate, coarse granules; distal part with 10 (10) longitudinal ridges. Genital seta ( 3a ) 14 (13-22) ( Figs. 3A, 3B , 5A, and 5B ). Figure 2. Abacarus zoysiae sp.nov. SEM of prodorsal shield,frontal lobe.Scale bar:2 µm. Figure 3. Abacarus zoysiae sp. nov. (A) ventral habitus of female;(B) Dorsal view of female.Scale bar: 20µm. Figure 4. Abacarus zoysiae sp. nov. (A,B) SEM of legs I and II: (C) Drawing of legs I and II; (D) detail of empodium.Scale bar:A and B: 20 µm;C and D: 5 µm. Figure 5. Abacarus zoysiae sp.nov. (A) Dorsal view of female;(B)Ventral view of female.Scale bar:20 µm. Legs: leg I 27 (26-28); femur 10 (8-10), ventral basifemoral seta ( bv ) 9 (8-10); genu 5 (4-5), genual seta ( l” ) 23 (22-25); tíbia 6 (5-6), tibial seta ( l’ ) 6 (5-8), medio-distally; tarsos 5 (5-6), dorsal seta ( ft’ ) 15 (13-15), lateral seta ( ft” ) 22 (21-14), unguinal seta ( u’ ) 5 (4-5), solenidion ( ω ) 7 (7-8), distally blunt, empodium simple 6 (6-7), 7-rayed. Leg II 25 (22-27); femur 7 (5-8), seta ( bv ) 14 (12-15); genu 4 (3-5), seta ( l” ) 11 (9-12); tíbia 4 (3-4); tarsus 5 (5-6), seta ( ft’ ) 6 (5-8), seta ( ft” ) 22 (21-23), seta ( u’ ) 4 (4-5), solenidion ( ω ) blunt distally, 7 (7-8), empodium 6 (6-7), 7-rayed ( Figs. 4A, 4B and 4C ). Male (n = 3): Similar to but smaller than female, 148-166 length; 34-40 wide ( Figs. 6A and 6B ).