Cheylostigmaeus powersi Habeeb, comb. n.
Creators: name: Fan, Qing-Hai
name: Zhang, Zhi-Qiang
Publisher: name: Zenodo
Year: 2004
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Prostigmata
Stigmaeidae
Cheylostigmaeus
Cheylostigmaeus powersi

description: Cheylostigmaeus powersi (Habeeb) comb. n. (Figs. 4–6)
Eustigmaeus powersi Habeeb, 1961: 1.
Material examined
Cotypes, 2 adult females, USA, New York, Cayuga Co., Como Lake, swale, 9 April 1961, by H. Habeeb (HH610004); 2 adult females, USA, New York, Onondaga Co., beside Rt. 20 east of Skaneateles swampy pond, 15 April 1961, by H. Habeeb (HH610005).
Diagnosis
Adult female. Dorsal idiosomal setae slender, apically with hyaline sheaths; ratios vi: vi–vi = 2.4 (2.0–2.4), ve: ve–sci = 2.1 (2.1–2.6), sci: sce = 0.9 (0.8–0.9), c1: c1–c1 = 0.9 (0.9–1.1), e1: e1–e1 = 0.7 (0.7–0.9), c1–c1: d1–d1: e1–e1: f1–f1 = 1.3 (1.0–1.3): 1.7 (1.4– 1.7): 1.6 (1.4–1.6): 1.0. Dorsalmost setae on femora I 0.9 (0.9–1.0) times lengths of h1.
Description
ADULT FEMALE (n = 4)
Gnathosoma. Finely punctate. Chelicerae about twice as long as movable digits (133 (133–145): 71 (71–83)). Palp 136 (136–150). Subcapitular setae m slightly longer than n, m = 30 (30–33), n = 25 (25–28); m–m less than distance n–n; m–m = 26 (26–35), n–n = 33 (33–38), m–n = 25 (25–30).
Idiosoma. Nearly round, 317 (317–365) long, 227 (227–273) wide. Dorsal idiosomal shields plain, finely punctate. Dorsal idiosomal setae slender, apically with hyaline sheaths; ratios vi: vi–vi = 2.4 (2.0–2.4), ve: ve–sci = 2.1 (2.1–2.6), sci: sce = 0.9 (0.8–0.9), c1: c1–c1 = 0.9 (0.9–1.1), e1: e1–e1 = 0.7 (0.7–0.9), c1–c1: d1–d1: e1–e1: f1–f1 = 1.3 (1.0– 1.3): 1.7 (1.4–1.7): 1.6 (1.4–1.6): 1.0; eyes 15 (15–18) in diameter; setal lengths: vi 66 (66–73), ve 85 (85–110), sci 63 (63–70), sce 71 (71–88), c1 78 (78–90), d 1 70 (70–90), d 2 68 (68–93), e1 76 (76–98), e 2 80 (80–100), f1 88 (88–100); distances: vi– vi 27 (27–35), vi– ve 58 (58–65), ve–sci 40 (40–43), sci–sce 22 (20–25), c1–c1 87 (78–88), c1–d1 64 (63–64), d1–d1 110 (108–113), d1–d2 62 (62–70), d1– e 1 68 (68–73), e1–e1 103 (103–108), e1– e 2 47 (47–53), e1–f1 50 (50–55), f1–f1 66 (66–80); humeral setae c 2 67 (67–73), shorter than c1. Suranal setae h1: h2 = 1.3 (1.0–1.3), h1 59 (59–61), h2 47 (47–58). Ventral setae 1a about as long as other two pairs, 3a situated between coxae III, 1a 30 (30–33), 3a 30 (30–35) and 4a 29 (29–33). Aggenital shield and genitoanal valves confluent, with 3 pairs of subequal setae, ag1 22 (22–25), ag2 22 (22–25), ag3 22 (22–25); pseudanal setae ps1 thicker than other two pairs, ps 3 20 (20–23), ps 2 22 (22–25), ps1 22 (22–25).
Legs. Length: leg I 278 (278–328), leg II 213 (213–238), leg III 211 (211–230), leg IV 235 (235–270). Dorsalmost setae on femora I (dFI) slender, apically with hyaline sheaths, 52 (52–63) long, 0.9 (0.9–1.0) times length of h1. Dorsalmost setae on genua I (dGI) as dFI, 50 (50–58) long; on genua I subequal to dGI, 50 (50–55), on genua II peg­like, pointed, 8 (8–13). Counts of setae and solenidia on legs I–IV: coxae 2 + 1 elcp, 2, 2, 2; trochanters 1, 1, 2, 1; femora 6, 5, 3, 2; genua 3 + 1, 3 + 1, 1, 1; tibiae 5 + 1 + 1 p, 5 + 1 p, 5 + 1 p, 5 + 1 p; tarsi 13 + 1, 9 + 1,,. Lengths of solenidia: I 26 (26–28), II 20 (20–23), III 11 (10–11), IV 6 (5–6).
Remarks
This species was wrongly placed in Eustigmaeus by Habeeb (1961). Females of Cheylostigmaeus are not easy to identify. Key characters for recognition are mainly based on males, such as the structure of subcapitulum and aedeagus. Therefore, questions of the status of this species remain until males are discovered.
description: Published as part of Fan, Qing-Hai & Zhang, Zhi-Qiang, 2004, in the collection of H. Habeeb, pp. 1-28 in Zootaxa 763 on pages 9-13, DOI: 10.5281/zenodo.169564