Stigmaeus bifurcus, Bingül & Doğan & Dilkaraoğlu, 2017

Bingül, Meryem, Doğan, Salih & Dilkaraoğlu, Sibel, 2017, Contributions to the knowledge of the mite genus Stigmaeus Koch, 1836 (Acari: Stigmaeidae) of Turkey, European Journal of Taxonomy 307, pp. 1-16 : 4-8

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).

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.

Figures

Fig. 1. Stigmaeus bifurcus sp. nov. A–B. Holotype (♀). A. Dorsum of body. B. Venter of body. – C–D. Paratype (♀). C. Abnormality: left seta c1 about 2 times as long as the right. D. Abnormality: seta h3 absent on right suranal shield in one paratype. Scale bars = 100 μm.

Fig. 2. Stigmaeus bifurcus sp. nov., holotype, ♀. A. Some dorsal body setae. B. Palp. C. Leg I. D. Leg II. E. Leg III. F. Leg IV. Scale bars: A–B = 40 μm; C–F = 100 μm.

Tables

Table 1. Differences among the Stigmaeus species having laterally two extra non setose dorsal shields. – = absent; + = present.

Characters	Species
	S. bifurcus sp. nov.	S. hashtrudiensis	S. caria	S. kermanshahiensis	S. shabestariensis	S. petilus	S. erzincanus	S. additicius	S. ceylani
Shape of accessory claw on palp tibia	seta-like	seta-like	spine-like	spine-like	spine-like	spine-like	seta-like	spine-like	seta-like
Shape of palp eupathidion	bifurcate	bifurcate	bifurcate	bifurcate	trident	trident	trident	?	trident
The number of setae on palp tibia (except for claw and accessory claw)	2	2	3	3	2	2	2	2	2
Shape of dorsal body setae	almost smooth	smooth	almost smooth	almost smooth	smooth	slightly serrated (except for setae ve, sce, d 2, c 2)	stout	slightly serrated	slightly spinulate
Platelets bearing the setae sce	+	– or +	–	+	+	+	+	–	+
Apodemal marking	+	– or +	–	–	–	–	+	+	+
Additional a pair of shields next to propodosomal shield	–	–	–	–	+	–	+	–	+
Median zonal shields	divided	divided	divided	divided	divided	entire	divided	divided	divided
Suranal shield	divided	divided	divided	divided	entire	divided	entire	entire, but recessed anteriorly	entire
The number of setae pairs on suranal shield	3	3	3	3	3	2	3	3	3
Aggenital shields	longitudinally divided into two parts	longitudinally divided into two parts	longitudinally divided into two parts	longitudinally divided into two parts	longitudinally divided into two parts	longitudinally divided into two parts	longitudinally divided into two parts	longitudinally divided into two parts	divide into four parts
Shape of aggenital setae	smooth	smooth	smooth	smooth	smooth	slightly serrated	smooth	smooth	smooth
Pattern on ventral shields	–	– or +	–	–	–	–	+	+	–
Setal formulae of leg genua	5(+1κ)-3-0-1	5(+1κ)-4-1-2	5(+1κ)-2-0-1	5(+1κ)-3-0-2	5(+1κ)-5-2-2	5(+1κ)-3-0-1	5(+1κ)-5-2-2	5(+1κ)-5-2-2	5(+1κ)-5-2-2
Setal formulae of leg tarsi	13(+1ω)-8(+1ω)- 7(+1ω)-7(+1ω)	13(+1ω)-8(+1ω)- 7(+1ω)-7(+1ω)	13(+1ω)-8(+1ω)- 7(+1ω)-7(+1ω)	13(+1ω)-8(+1ω)- 7(+1ω)-7	13(+1ω)-9(+1ω)- 7(+1ω)-7(+1ω)	13(+1ω)-8(+1ω)- 7(+1ω)-7(+1ω)	13(+1ω)-9(+1ω)- 7(+1ω)-7(+1ω)	13(+1ω)-9(+1ω)- 7(+1ω)-7(+1ω)	13(+1ω)-9(+1ω)- 7(+1ω)-7(+1ω)