Mediostigmaeus floridanus, Fan, Qing-Hai & Walter, David E., 2005

Fan, Qing-Hai & Walter, David E., 2005, Mediostigmaeus gen. n. (Acari: Stigmaeidae), with the description of a new species from the USA, Zootaxa 1036, pp. 21-29 : 23-28

publication ID	https://doi.org/ 10.5281/zenodo.169731
DOI	https://doi.org/10.5281/zenodo.6264908
persistent identifier	https://treatment.plazi.org/id/2958525B-FFEC-D228-A552-F9C3F14EF8B7
treatment provided by	Plazi
scientific name	Mediostigmaeus floridanus
status	sp. nov.

Treatment

Mediostigmaeus floridanus sp. n. ( Figs. 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3 ; Plate 1)

Diagnosis

Adult female. Prodorsum with a small shield on which setae vi and ve inserted; Central hysterosomal shield not reaching level of e1; ratio sci: sci–sce = 0.56; c1–c1: d1–d1: e1–e1: f1–f1 = 1.2: 2.0: 1.0: 1.3; 1a, 3a and 4a subequal; 3 pairs of aggenital setae each on a platelet; tarsi I–IV with 8+1, 8+1, 6, 6.

Material examined

HOLOTYPE, adult female, USA: Orlando, Lake Adair, Florida Orange Co., 3 July 1990, D.E. Walter, leaf domatia of Vitis sp., AD90184 7/3, 1/ 1 female. It will be deposited in the National Mite Collection, Systematic Entomology Laboratory, USDA, ARS, BARC West No. 047, Beltsville, MD 207052350, USA.

Description

ADULT FEMALE (n= 1)

Gnathosoma ( Figs. 1–2 View FIGURE 1 View FIGURE 2 ; Plate 1). Chelicerae slender, 54, movable digits 26, nearly half length of chelicerae. Palp 51, accessory claw setalike. Subcapitular setae m 17, m–m = 20.

Idiosoma ( Figs. 1–2 View FIGURE 1 View FIGURE 2 , Plate 1). Broadly oval, 271 long, 169 wide. Dorsal idiosomal setae barbed. Prodorsum with a small shield, reticulation obscure; setae vi, ve, eyes and pob situated on prodorsal shield; eyes 6 in diameter, pob faint, 8 in diameter; setae sci and sce on platelets; ratio vi: vi–vi = 1.1, ve: ve–sci = 0.5, sci: sci–sce = 0.56; setal lengths: vi 12, ve 13, sci 13.5, sce 13.5; distances: vi– vi 11, vi–ve 17, ve–sci 28, sci–sce 24. Central hysterosomal shield spindleshaped, ornamented with broken striae, not reaching to level of e1; platelets bearing setae e1 triangular, slightly larger than those bearing c1, d1, d2 and e2; ratio c1–c1: d1–d1: e1–e1: f1–f1 = 1.2: 2.0: 1.0: 1.3, c1: c1–c1 = 0.3, e1: e1–e1 = 0.4; setal lengths: c1 12, d1 13, d2 13, e1 12, e2 13, f1 13; distances: c1–c1 36, c1–d1 49, d1–d1 63, d1– d2 37, d1– e 1 39, e1– e 1 31, e1– e 2 18, e1–f1 22, f1–f1 39; humeral setae c2 15.5, c2–c1 50. Suranal shield entire, bearing 2 pairs of prominently barbed setae, h1 = h2 = 16.5. Ventral setae subequal, 1a 38, 3 a 37, 4 a 37. Aggenital area with 3 pairs of subequal setae, each on a platelet, ag1 14, ag2 14, ag3 14.5, ag1–ag2 about one third distance of ag2–ag3; genital setae as long as ag1, 14; pseudanal setae ps1 thicker than other two pairs, lengths ps3 14, ps2 13, ps1 12.

Legs ( Fig. 3 View FIGURE 3 ). Length: leg I 108, leg II 92, leg III 92, leg IV 105. Setae dFI and dGI barbed, 15 and 13 long, respectively. Counts of setae and solenidia on legs IIV: coxae 2+1 elcp, 1, 2, 1; trochanters 1, 1, 1, 1; femora 4, 4, 2, 2; genua 1+1, 0, 0, 0; tibiae 5+1 p, 5+1 p, 5+1 p, 5+1 p; tarsi 8+1, 8+1, 6, 6. Lengths of solenidia: I 8, II 7, III 5.5.

Remarks

The adult female of this new species can be readily separated from those of the only other known species of the genus, M. citri , by having tarsus II with 8+1, prodorsal setae sci about 1/2 distance of sci–sce and central hysterosomal shield not reaching level of e1.

PLATE 1. Mediostigmaeus floridanus sp. n. (adult female). A, prodorsum; B, hysterosoma C–E; C, hysterosoma E–H; D, subcapitulum and coxae I; E, venter between 1a and 3a; F, venter between 3a and 4a; G, genitoanal area.