Stigmaeus communis, Doğan & Doğan & Erman, 2017

Doğan, Sibel, Doğan, Salih & Erman, Orhan, 2017, Description of five new species of the genus Stigmaeus Koch (Acari: Raphignathoidea: Stigmaeidae) from Turkey, Zootaxa 4276 (4), pp. 451-478 : 452-456

Stigmaeus communis sp. nov.

Female (n = 3) ( Figs. 1–3 ). Idiosoma oval. Length of body 450 (457–479), width 216 (184–206). Gnathosoma 88 (89–91). Leg I 233 (245–249), leg II 201 (213–218), leg III 197 (208–211), leg IV 237 (251–259).

Dorsum of idiosoma. All dorsal shields with polygonal reticulations. Prodorsum covered with a large propodosomal shield, bearing three pairs of setae (vi, ve and sci), and a pair of small lateral platelets, bearing setae sce. Anterior propodosomal shield oval and bearing a pair of apodemal marking and post-ocular bodies (pob) 28 (24–30) in diameter. Eyes absent. Setae c 1 and d 1 on central shield. Setae d 2 located on large marginal shields. Setae e 2 located on lateral zonal shields. Median zonal and intercalary shields paired and bearing setae e 1 and f 1, respectively. Suranal shield undivided and bearing two pairs of setae (h 1 and h 2). Humeral shields situated ventrolaterally between coxae II and III, bearing setae c 2. Dorsum with 13 pairs of setae (setae h 3 absent). Setae c 2 smooth and the longest, setae vi, h 1 and h 2 faintly barbed, others distinctly barbed distally. Lengths of dorsal idiosomal setae: vi 63 (65–65), ve 58 (60–63), sci 35 (37–38), sce 47 (45–48), c 1 36 (37–39), c 2 80 (80–82), d 1 38 (37–38), d 2 39 (41–43), e 1 38 (39–39), e 2 39 (41–42), f 1 45 (44–46), h 1 43 (45–45), h 2 55 (57–58). Distances between dorsal idiosomal setae: vi - vi 18 (23–24), ve -ve 93 (96–99), vi -ve 53 (64–65), sci -sci 157 (168–171), ve -sci 58 (61–63), sce -sce 231 (230–233), sci -sce 36 (34–37), c 1- c 1 80 (79–90), d 2- d 2 244 (237–258), c 1- d 1 86 (88–90), c 1- d 2 98 (99– 103), d 1- d 1 73 (77–81), d 2- d 1 89 (87–87), e 2- e 2 212 (210–217), d 2- e 2 91 (85–93), d 1- e 1 70 (76–80), d 1- e 2 82 (78–79), e 1- e 1 73 (69–71), e 2- e 1 67 (66–68), f 1- f 1 123 (125–126), e 1- f 1 56 (54–57), e 2- f 1 80 (85–86), f 1- h 1 58 (54–58), f 1- h 2 30 (26–29), h 1- h 1 42 (45–50), h 2- h 2 106 (109–113), h 1- h 2 32 (26–30). Ratios of setae: vi / ve 1.08, ve / sci 1.65.

Venter of idiosoma. Coxisternal and aggenital shields with similar pattern as that of dorsal shields. Coxisternal shields divided in midline and bearing three pairs of subequal intercoxal setae (1a, 3a and 4a). Lengths and distances of these setae: 1a 23 (24–25), 3a 22 (24–25), 4a 19 (21–24), 1a -1a 26 (28–29), 3a -3a 43 (37–42), 4a -4a 42 (31–44). Aggenital shield with three pairs of setae (ag 1-3). Anogenital shields smooth, bearing a pair of genital (g 1) and three pairs of pseudanal setae (ps 1-3), ps 1 weakly barbed, longer and thicker than others. Lengths of these setae: ag 1 23 (23–24), ag 2 20 (23–24), ag 3 25 (25–27), ps 1 33 (34–35), ps 2 23 (26–27), ps 3 22 (22–23).

Gnathosoma . Chelicerae 118 (115–117). Palp with reticular patterns, 125 (119–121). Subcapitulum reticulated, with two pairs of adoral setae (or 1,2) and two pairs of subcapitular setae (m, n). Lengths and distances of subcapitular setae: m 26 (23–24), n 14 (13–13), m–m 23 (28–29), n–n 23 (23–24), m–n 13 (15–16).

Legs. Leg segments reticulated. Counts of setae and solenidia on legs I–IV: coxae 2–2–2–2, trochanters 1–1– 2–1, femora 6–5–3–2, genua 3(+1κ)–3(+1κ)–1–1, tibiae 5(+1φ+1φρ)–5(+1φρ)–5(+1φρ)–5(+1φρ), tarsi 13(+1ω)– 9(+1ω)–7(+1ω)–7(+1ω).

Male (n = 2) ( Figs. 4 , 5 ) Resembles female in general appearance, but smaller in size and posterior of body narrower. Body length 300–332, width 199–205. Gnathosoma 69–70. Leg I 171–187, leg II 154–167, leg III 149– 161, leg IV 163–180.

Dorsum of idiosoma. Similar to that of female except propodosomal shield bearing four pairs of setae (vi, ve, sci and sce), hysterosomal area almost covered by a large median shield, bearing three pairs of setae (c 1, d 1 and d 2). Apodemal marking present on the both propodosomal and median shields. All dorsal body setae faintly barbed; lengths of these setae: vi 34 –36, ve 36–39, sci 17–21, sce 25–27, c 1 17–20, c 2 51–52, d 1 17–20, d 2 23–26, e 1 17–19, e 2 22–29, f 1 24–28, h 1 14–15, h 2 33–34. Distances between dorsal body setae: vi - vi 15–16, ve -ve 59–66, vi -ve 36–42, sci -sci 119–123, ve -sci 43–46, sce -sce 155–166, sci -sce 17–18, c 1- c 1 51–55, d 2- d 2 157–163, c 1- d 1 60–67, c 1- d 2 59– 64, d 1- d 1 45–46, d 2- d 1 58–60, e 2- e 2 125–129, d 2- e 2 53–58, d 1- e 1 32–38, d 1- e 2 40–46, e 1- e 1 33–36, e 2- e 1 42–47, f 1- f 1 63– 68, e 1- f 1 32–34, e 2- f 1 44–45, f 1- h 1 27–32, f 1- h 2 28–33, h 1- h 1 21–23, h 2- h 2 56–65, h 1- h 2 11–18.

Venter of idiosoma. Similar to female except genital seta absent. Coxisternal shields divided, with reticulum and bearing three pairs of intercoxal setae. The lengths and distances of these setae: 1a 16–17, 3a 16–17, 4a 14–14, 1a -1a 20–21, 3a -3a 30–31, 4a -4a 24–27. Aggenital shield with reticulum and three pairs of setae (ag 1-3). Anal shields bearing three pairs of pseudanal setae (ps 1-3). Lengths of setae: ag 1 15–16, ag 2 15–16, ag 3 14–15, ps 1 11–12, ps 2 2–3, ps 3 5–5.

Gnathosoma . Chelicerae 99–101. Palp 107–112, counts of palpal setae similar with female. Lengths and distances of subcapitular setae: m 16–16, n 11–13, m–m 21–22, n–n 17–19, m–n 10–12.

Legs. Counts of setae and solenidia same as in female, except solenidia on tarsi I–IV (each bearing an extra solenidion ω ♂).

Immature stages. Unknown.

Etymology. The specific name communis means common in Latin, referring to this species sharing characters in common with both of its two related species.

Type materials. Holotype female from litter under rock, 40° 38' 41''N, 39° 08' 52''E, 714 m. a.s.l., 10 October 2014, Harşit Valley , TURKEY. Paratypes: 2 females and 2 males the same data.

Remarks. This new species resembles Stigmaeus uzunolukensis Özçelik & Doğan, 2011 and S. obtectus Summers, 1962 in the presence of post-ocular bodies, absence of eyes, similar leg setal formulas, and bearing one pair of genital and three pairs of aggenital setae. But it differs from S. uzunolukensis in the shape of the dorsal body setae (most of the setae not widened, with barbed tips, only a few setae slightly widened in the new species vs. most of the setae distinctly widened and comb-shaped distally in S. uzunolukensis ), c 2 the longest of the dorsal setae in S. communis sp. nov. while ve is the longest in S. uzunolukensis , ratio vi/ve 1.08 vs. 0.39 in S. uzunolukensis , and bigger body size (length of body 450 (457–479), width 216 (184–206) in the new species vs. (length 322 (300– 350), width 171 (150–200) in S. uzunolukensis ) ( Özçelik & Doğan 2011).

Stigmaeus communis sp. nov. can be separated from S. obtectus by the shape of the dorsal body setae. In the type specimens of S. obtectus the dorsal body setae terminate abruptly in jagged splinters as though broken or chopped ( Summers 1962). The new species can also be separated from the Turkish specimen of S. obtectus described by Koç & Ayyıldız (1997) by the distinctly smaller body size (length of body 630, width 294 in the Turkish S. obtectus ), setae vi and ve barbed (smooth in the Turkish S. obtectus ), higher ratio ve / sci (1.65 in the new species vs. 1.3 in the Turkish S. obtectus ), and the different number of setae on leg genu II and femur IV (four and two setae respectively in the new species vs. each bearing three setae in the Turkish S. obtectus ) ( Koç & Ayyıldız 1997).

Figures

FIGURE 1. Stigmaeus communis sp. nov. (Female) A Dorsal view of idiosoma, B. Ventral view of idiosoma.

FIGURE 2. Stigmaeus communis sp. nov. (Female) Some dorsal setae.

FIGURE 3. Stigmaeus communis sp. nov. (Female) A. Leg I, B. Leg II, C. Leg III, D. Leg IV.

FIGURE 4. Stigmaeus communis sp. nov. (Male) A. Dorsal view of idiosoma, B. Ventral view of idiosoma.

FIGURE 5. Stigmaeus communis sp. nov. (Male) A. Leg I, B. Leg II, C. Leg III, D. Leg IV.