Stigmaeus bifurcus Bingül & Doğan & Dilkaraoğlu 2017, sp. nov.
Creators: name: Bingül, Meryem
name: Doğan, Salih
name: Dilkaraoğlu, Sibel
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Stigmaeidae
Stigmaeus
Stigmaeus bifurcus

description: Stigmaeus bifurcus sp. nov.
urn:lsid:zoobank.org:act: 2EB6B605-F3AA-4142–8692-BD150A8A85D0
Figs 1–2; Table 1
Etymology
The name of this new species, bifurcus, refers to the shape of the eupathidion on the palptarsus.
Type material
Holotype
TURKEY: ♀, from soil under Ulmus sp., Erzincan, alt. 1275 m, 39º39'39.8" N, 39º29'28.5" E, 25 Oct. 2015.
Paratypes
TURKEY: 8 ♀♀, same data as holotype; 1 ♀, from soil under Rosa canina, same locality as holotype, 15 Mar. 2015.
Description
Female
IDIOSOMA. Elongated. Length of body (including gnathosoma): 396 (350–384). Width of body: 163 (129–157).
GNATHOSOMA (Fig. 2B). Gnathosoma punctate and 68 (65–70) long, chelicerae separate and punctate, 78 (74–81) long. Palp punctate and 91 (74–89) long. Counts of setae and solenidia from palptrochanter to palptarsus: 0, 3, 1, 2 + 1 claw + 1 seta-like accessory claw, 4 + 1 solenidion + 1 subterminal seta-like eupathidion + 1 bifurcate eupathidion. Palptibial claw slightly longer than palptarsus. Palp supracoxal setae (elcp) pudgy. Subcapitulum with two pairs of adoral setae (or 1,2) and two pairs of subcapitular setae (m, n). Dimensions and distance between subcapitular setae, m 14 (12–14), n 26 (22–25), m–m 21 (19–22), n–n 24 (23–26), m–n 12 (10–12).
DORSUM (Figs 1A, C–D, 2A). Integument striate except punctate peritremal region, propodosomal shield with reticulations, its posterior margin concave and with tubercles. Propodosomal shield bearing three pairs of setae (vi, ve, sci) and apodemal marking, eyes and post-ocular bodies absent. Setae sce on minute platelets. Central shield vaguely reticulate but other shields not ornamented. Central shield bearing two pairs setae (c 1, d 1). In one paratype specimen left member of setae c 1 about twice as long as right member (Fig. 1C). Setae d 2 located on marginal shield. Setae e 1 on divided median zonal shields. Setae e 2 located on minute platelets. Setae f 1 on divided intercalary shield. One pair of extra, minute and non-setose shields lateral to intercalary shields. Suranal shield divided and with three pairs of setae (h 1–3) but right member of setae h 3 absent in one paratype (Fig. 1D). Setae vi, sci, d 1 and all suranal setae slightly serrated but others smooth (Fig. 2A). Lengths and distances of dorsal idiosomal setae as follows: vi 16 (14–17), ve 42 (38–47), sci 20 (17–20), sce 41 (40–44), c 1 16 (15–17), c 2 46 (45–49), d 1 16 (16–18), d 2 34 (29–35), e 1 8 (17–20), e 2 18 (17–19), f 1 31 (34–38), h 1 21 (21–26), h 2 24 (21–26), h 3 13 (13–15), vi–vi 23 (24–29), ve–ve 33 (31–35), vi–ve 20 (19–22), sci–sci 46 (43–48), ve–sci 36 (33–35), sce–sce 99 (86–104), sci–sce 27 (23–29), c 1 –c 1 31 (26–31), c 2 –c 2 145 (124–145), c 1 –c 2 63 (46–66), d 2 –d 2 100 (89–102), c 1 –d 1 43 (40–46), c 1 –d 2 41 (35–41), d 1 –d 1 28 (27–31), d 2 –d 1 43 (39–43), e 2 –e 2 96 (83–97), d 2 –e 2 62 (51–61), d 1 – e 1 47 (40–49), d 1 – e 2 51 (44–49), e 1 – e 1 32 (29–37), e 2 – e 1 34 (27–37), f 1 –f 1 46 (43–51), e 1 –f 1 26 (24–26), e 2 –f 1 42 (36–43), f 1 –h 1 40 (35–46), f 1 –h 2 40 (30–43), f 1 –h 3 41 (27–36), h 1 –h 1 23 (22–26), h 2 –h 2 52 (48–54), h 3 –h 3 70 (57–66), h 1 –h 2 16 (12–14), h 2 –h 3 9 (6–9).
*The Turkish specimens of S. hashtrudiensis Bagheri & Maleki, 2014 have a pair of additional small platelets (Uluçay 2015) but not in the type specimens (Bagheri et al. 2014).
VENTER (Fig. 1B). Almost striate. Back of coxae I–II and III–IV striate with tubercles. Humeral shields without reticulations and bearing setae c 2. Coxisternal shields divided, smooth and bearing three pairs of setae (1a, 3a, 4a). Lengths and distances of these setae: 1a 14 (12–13), 3a 14 (12–14), 4a 14 (11–14), 1a–1a 17 (17–21), 3a–3a 23 (20–29), 4a–4a 23 (16–26). Genital and anal shields contiguous, two pairs of smooth genital (g 1,2) and three pairs of slightly serrate pseudanal setae (ps 1–3). ps 3 shorter than other pseudanal setae. Four pairs of aggenital setae (ag 1–4) on long and divided aggenital shields. Lengths of these setae as follows: ag 1 10 (8–10), ag 2 10 (8–10), ag 3 10 (8–10), ag 4 11 (9–11), g 1 7 (6–9), g 2 12 (10–13), ps 1 27 (23–27), ps 2 25 (22–25), ps 3 13 (12–14).
LEGS (Figs 2 C–F). Coxae I–IV with punctation. Length: leg I 138 (136–140), leg II 106 (100–107), leg III 114 (108–115), leg IV 128 (121–129). Counts of setae and solenidia on legs I–IV: coxae 2-2- 2-2; trochanters 1-1-2-1; femora 4-4-3-2; genua 5(+1κ)-3-0-1; tibiae 5(+1φ+1φρ)-5(+1φρ)-5(+1φρ)- 5(+1φρ); tarsi 13(+1ω)-8(+1ω)-7(+1ω)-7(+1ω). All tarsi with solenidia. Lengths of solenidia: Iω 11 (8–12), IIω 8 (7–9), IIIω 6 (3–5), IVω 6 (3–5).
Male and immature stages
Unknown.
Remarks
This new species resembles Stigmaeus kermanshahiensis Khanjani et al., 2012 and S. caria Khanjani et al., 2012 in that the eyes and post-ocular bodies are absent, suranal shield divided, one pair of extra, minute and non-setose shields lateral to the intercalary shields, and the palp tarsus bears a bifurcate eupathidium. However, it can be separated from S. kermanshahiensis by the following characters: one seta on genu IV (vs two setae in S. kermanshahiensis), palptibia with two setae (vs three setae in S. kermanshahiensis), and apodemal marking present (absent in S. kermanshahiensis). Stigmaeus bifurcus sp. nov. can also be distinguished from S. caria by the following characters: three setae on genu II (vs two setae in S. caria), palptibia with two setae (vs three setae in S. caria), sce on minute platelets (on striate integument in S. caria), and apodemal marking present (absent in S. caria). The new species is also similar to S. hashtrudiensis Bagheri & Maleki, 2014; however, it differs from the latter in its apodemal marking and different numbers of setae on genua II–IV (genua 5(+1κ)-3- 0-1 in the new species vs 5(+1κ)-4- 1-2 in S. hashtrudiensis). See Table 1 for a comparitive presentation of characters among different Stigmaeus species.
description: Published as part of Bingül, Meryem, Doğan, Salih & Dilkaraoğlu, Sibel, 2017, Contributions to the knowledge of the mite genus Stigmaeus Koch, 1836 (Acari: Stigmaeidae) of Turkey, pp. 1-16 in European Journal of Taxonomy 307 on pages 4-8, DOI: 10.5852/ejt.2017.307, http://zenodo.org/record/3827173