Mediostigmaeus floridanus Fan & Walter, 2005, sp. n.
Creators: name: Fan, Qing-Hai
name: Walter, David E.
Publisher: name: Zenodo
Year: 2005
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Prostigmata
Stigmaeidae
Mediostigmaeus
Mediostigmaeus floridanus

description: Mediostigmaeus floridanus sp. n. (Figs. 1–3; 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; 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, 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). 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.
description: Published as part of Fan, Qing-Hai & Walter, David E., 2005, Mediostigmaeus gen. n. (Acari: Stigmaeidae), with the description of a new species from the USA, pp. 21-29 in Zootaxa 1036 on pages 23-28, DOI: 10.5281/zenodo.169731