Agistemus mendozensis Simons

Johann, Liana, Carvalho, Gervásio Silva, Majolo, Fernanda & Ferla, Noeli Juarez, 2013, Stigmaeid mites (Acari: Stigmaeidae) from vineyards in the state of Rio Grande do Sul, Brazil, Zootaxa 3701 (2), pp. 238-256 : 245-246

Agistemus mendozensis Simons

( Fig. 4 )

Agistemus mendozensis Simons, 1967: 56 , figs. 1–10.

Redescription. FEMALE. Gnathosoma . Palp coxae with 1 spiniform seta; trochanter without setae; femur with 3 long and serrate setae, one of them more robust; genu with 1 serrate seta; tibia with 3 setae and 1 claw, tarsus with 4 setae, 2 solenidia and 1 trifurcated sensillum ( Fig. 4 B). Infracapitulum with 2 pairs of long setae and 2 pairs of adoral setae distally. Idiosoma . Oval outline. Dorsum: Prodorsal shield reticulated with 3 pairs of serrate setae, 1pair of eyes and 1 pair of post-ocular bodies. Hysterosomal shield reticulated with 5 pairs of short serrate setae, not reaching the bases of surrounding setae. 4 small, smooth shields each with 1 lanceolate seta (setae c2 and f). Suranal shield smooth with 2 pairs of setae, h1 and h2. Venter: 3 pairs of slender setae between coxae inserted on small shields, 1a at level of coxa II, 3a anterior to coxa III and 4a at level of coxa IV. Anogenital regions with a horseshoe-shaped shield surrounding genital opening anteriorly ( Fig. 4 C) with 2 pairs of agenital setae (ag1 and ag2). Genital region with 4 pairs of setae (g1, ps3, ps2 and ps1). Seta g1 almost reaching the base of ps1. Setae ps3, ps2, and ps1 robust and slightly serrate. Leg I – IV setation ( Fig. 4 D): coxae 2(1)-1-2-1; trochanters 1-1-1-1; femora 4-4-2-2; genua 3-0-0-0; tibiae 5(1)-5(1)-5(1)-4; tarsi 11(1)-9(1)-7(1)-7.

MALE. Unknown.

Material examined. CAS-04 (MCN). 2 females from Candiota, V. vinifera, Merlot cultivar: 1 female, 14 February 2007, coll. C.L.Klock; 1 female, 18 May 2007, coll. C.L.Klock.

Distribution. This species was reported on apple trees ( Malus sp.) in Argentina (Simons 1967). Ruiz (2007) noted that this species is one of the most abundant in apple orchards in the Rio Negro province, Argentina. This is the first time it was found in the state of Rio Grande do Sul, Brazil.

Measurements of this species are provided in Table 3 .

Character measured Females (n=2) Female holotype (Simons 1967)

Mean SD Max Min

SD = Standard Desviation

Figures

FIGURE 4. Agistemus mendozensis Simons, 1967 (female). A: dorsum; B: palp; C: anogenital region ventrally; D: legs I and II in dorsal view.

Tables

TABLE 3. Measurements of Agistemus mendozensis Simons 1967. (females)

Body length	426	23.0	442	410	285
Idiosoma	311	19.4	325	298	218
Body width	225	21.2	240	210	142
ve	16	0.7	17	16	10
sci	25	1.4	26	24	21
sce	28	0.7	28	27	21–25
c 1 c 2 d 1 d 2 e 1 e 2 f	24 27 24 26 32 36 34	2.1 0.0 0.7 0.7 0.7 7.8 2.8	26 27 25 26 32 42 36	23 27 24 25 31 31 32	19–20 22–23 21 23 29 29 29–31
h 1 h 2 ve-ve	35 32 26	1.4 2.1 0.7	36 34 27	34 31 26	34 34 32
c 1 -c 1 d 1 -d 1 e 1 -e 1 f-f	31 60 28 68	0.0 2.8 0.7 2.1	31 62 29 70	31 58 28 67	33 59 28 62
h 1 -h 1 ve/ve-ve	18 0.6	1.4 0.04	19 0.7	17 0.6	21 0.30–0.50
c1/c1-c1	0.8	0.06	0.8	0.7	0.58–0.68
d1/d1-d1	0.4	0.01	0.4	0.4	0.35–0.43
e1/e1-e1	1.1	0.06	1.1	1.1	0.93–1.10
f/f-f	0.5	0.06	0.5	0.5	-
h1/h1-h1	2.0	0.23	2.1	1.8	-