A new record and a new species of the genus Agistemus Summers (Acari: Stigmaeidae) from Greece
Author
Stathakis, Theodoros I.
Author
Kapaxidi, Eleftheria V.
Author
Papadoulis, Georgios Th.
text
Zootaxa
2014
3780
1
153
170
journal article
46178
10.11646/zootaxa.3780.1.6
7dd3404c-b283-4755-bd33-2779aa9ca43d
1175-5326
226082
7AD1E7AB-9825-4928-AB3D-5F1D39D337B8
Agistemus macrosetosus
Stathakis & Kapaxidi
n. sp.
Diagnosis.
Female
. Dorsal shields plain;
pob
about 3.4 times as large as eye; dorsal idiosomal setae long and barbed, tapered distally, set on tubercules;
vi
/
vi–vi
4.8
4.6 (4.4–5.0),
c1
/
c1–c1
2.9
2.9 (2.1–3.0). Aggenital shield divided along midline by a striated area, each side with two subequal setae (
ag1
,
ag2
). Coxa IV with two setae; femur I with five setae; genu I with 3+1
κ
; tibia IV with 5+1
φp
; tarsus I with 12+1
ω
; tarsus IV with seven setae.
Male
. Postocular body 2.6 times as large as eye;
vi
/
vi–vi
3.8
3.0 (2.9–3.8),
c1
/
c1–c1
2.0
1.7 (1.4–2.0).). Aggenital shield entire, belt–shaped with two pairs of subequal setae (
ag1
,
ag2
). Dorsal shields and counts of setae and solenidia as in female except for tarsi I–IV with 12+2
ω
, 9+2
ω
, 7+1
ω
, 7+1
ω
.
Female (n = 7)
Dorsum
(
Figure 23
). Oval, sclerotized; length of body (excluding gnathosoma)
305
324 (301–361), width
226
249 (226–278). Idiosoma covered with seven plain shields surrounded by fine striae. Dorsal setae set on tubercles, long and barbed, with blunt tip, except for
c2
which are more slender (
Figures 24
,
34
). Prodorsal shield with three pairs of setae,
vi
58
64 (58–72),
ve
90
97 (90–105),
sci
76
85 (76–96), one pair of eyes
10
11 (10–12) in diameter and one pair of postocular bodies (
pob
)
34
37 (32–40) in diameter. Central hysterosomal shield entire, rounded, bearing five pairs of setae,
c1
80
85 (80–90),
d1
80
86 (80–96),
d2
82
88 (80–99),
e1
90
98
(90–109),
e2
92
98
(92– 109). Intercalary shields with setae
f1
70
80 (70–88). Humeral shields with setae
c2
42
51 (40–60) (
Figures 25
,
35
). Suranal shield with two pairs of setae
h1
42
48 (42–52) and
h
2
24
30 (24–34).Distances between setae:
vi–
vi
12
14 (12–16),
ve–ve
50
52 (50–54),
sci–sci
105 106 (99–111),
vi–ve
26
27 (24–34),
ve–sci
40
44 (40–48),
c1–c
1
28
33 (28–42),
d1–d1
88
88 (80–99),
d2–d2
123
131 (123–139),
e1–
e1
34
34 (30–36),
e2–e2
113
122 (113–133),
f1–f1
62
67 (60–74),
h1–h
1
20
17 (14–20),
h2–h2
58
60 (54–66),
c1–d1
58
62 (58–66),
c1–d2
60
64 (60–70),
d1–d
2
30
29 (26–36),
d1–
e1
60
66 (58–72),
d1–
e2
44
44 (40–48),
d2–
e2
58
57 (54–60),
e1–
e2
44
49 (44–54),
e1–f1
34
34 (26– 40),
h1–h
2
22
26 (22–28). Ratios:
pob
/eye
3.4
3.4 (3.0–4.0),
vi
/
vi–vi
4.8
4.6 (4.4–5.0),
c1
/
c1–c1
2.9
2.9 (2.1–3.0),
d1
/
d1–d1
0.9
1.0 (0.9–1.0),
e1
/
e1–
e1
2.6
2.9 (2.6–3.0),
h1
/
h2
1.8
1.6 (1.6–1.8).
Venter
(
Figure 26
). Ventral setae subequal,
1a
35
37 (29–47),
3a
31
38 (31–47),
4a
35
40 (33–47). Aggenital shield divided along midline by a striated area, each side with two subequal setae,
ag
1
16
18 (16–21) and
ag
2
16
19 (16–21). Anogenital covers with one pair of genital setae,
g
1
18
19 (17–20) and three pairs of pseudanal setae,
ps
1
14
16 (14–19),
ps
2
17
17 (16–18),
ps
3
15
16 (15–19) (
Figure 27
).
FIGURES 23–29.
Agistemus macrosetosus
Stathakis & Kapaxidi
n. sp.
(female). 23. Dorsum; 24. Seta
ve
; 25. Seta
c2
; 26. Venter; 27. Anogenital region (ventral view); 28. Subcapitulum; 29. Palp. Scale bar = 100 Μm for 23, 26; 30 Μm for 24, 25, 27, 28, 29.
FIGURES 30–33.
Agistemus macrosetosus
Stathakis & Kapaxidi
n. sp.
(female). 30. Leg I; 31. Leg II; 32. Leg III; 33. Leg IV. Scale bar = 100 Μm.
FIGURES 34–35.
Agistemus macrosetosus
Stathakis & Kapaxidi
n. sp.
(female). 34. Seta
e2
; 35. Seta
c2
. Scale bar = 30 Μm.
Gnathosoma.
Subcapitulum bearing two pairs of adoral setae (
ro1
,
ro2
) and two pairs of subcapitular setae,
m
31
35 (31–39) and
n
51
52
(48–55). Distances between subcapitular setae:
m–m
41
43 (41–47),
n–
n
31
33 (31–35) and
m–
n
8
10 (8–11) (
Figure 28
). Movable cheliceral digits
40
41 (40–44), in length. Palpi five-segmented; palptarsus with a tridentate terminal eupathidium, one subterminal spine-like eupathidium, one solenidion and four smooth setae; palptibia with a large claw, a robust accessory claw and two proximal setae; palpgenu with one smooth seta; palpfemur with two smooth and one barbed setae (
Figure 29
).
Legs
(
Figures 30–33
). Length of legs: legI
294
301 (290–321), legII
254
260 (242–286), legIII
246
257 (238– 278), legIV
274
297 (274–317). Counts of setae and solenidia on legs I–IV: coxae 2+1
elcp
, 1, 2, 2; trochanters 1, 1, 1, 1; femora 5, 4, 2, 2; genua 3+1
κ
, 1, 0, 0; tibiae 5+1
φp
, 5+1
φp
, 5+1
φp
, 5+1
φp
; tarsi 12+1
ω
, 9+1
ω
, 7+1
ω
, 7. Length of spines and solenidia:
κ
I
3
3 (3–4),
ω
I
26
28
(26–31),
ω
II
27
27
(26–29),
ω
III
17
18
(16–20).
Male (n = 5)
Dorsum
(
Figure 36
). Oval, well sclerotized; length of body (excluding gnathosoma)
266
252 (238–274), width
191
190 (179–202). Idiosoma covered with five shields surrounded by fine striae. Dorsal setae as in female. Prodorsal shield with three pairs of setae,
vi
60
52 (50–60),
ve
74
66 (60–74),
sci
70
62 (56–70), one pair of eyes
10
11 (10–14) in diameter and one pair of postocular bodies (
pob
)
30
28 (24–30) in diameter. Central hysterosomal shield entire, bearing six pairs of setae,
c1
60
55 (50–60),
d1
40
40 (34–46),
d2
62
59 (54–62),
e
1
28
27
(26–28),
e2
64
60
(54–68),
f1
66
61 (56–66). Humeral shields with setae
c2
50
44 (40–50). Suranal shield with two pairs of setae
h
1
14
16 (14–18) and
h
2
20
20 (18–20). Distances between setae:
vi–
vi
16
17 (16–18),
ve–ve
52
49 (46–52),
sci–sci
92
95 (92–99),
vi–ve
24
22 (20–24),
ve–sci
36
39 (36–42),
c1–c
1
30
33 (30–36),
d1–d1
76
73 (68–78),
d2– d2
111
111 (103–115),
e1–
e1
34
34 (32–36),
e2–
e2
94
94 (84–103),
f1–f1
42
41 (38–44),
h1–h
1
12
10 (6–12),
h2– h2
40
44 (40–48),
c1–d1
50
53 (50–56),
c1–d2
54
54 (50–58),
d1–d
2
20
24 (20–28),
d1–
e1
44
44 (42–46),
d1–
e
2
30
30 (28–30),
d2–
e2
38
41 (38–44),
e1–
e2
34
33 (30–36),
e1–f
1
20
20 (16–24),
h1–h
2
16
18 (14–20). Ratios:
pob
/ eye
3.0
2.6 (2.1–3.0),
vi
/
vi–vi
3.8
3.0 (2.9–3.8),
c1
/
c1–c1
2.0
1.7 (1.4–2.0),
d1
/
d1–d1
0.5
0.5 (0.5–0.7),
e1
/
e1–
e1
0.8
0.8 (0.7–0.8),
h1
/
h2
0.7
0.8 (0.7–0.9).
Venter
(
Figure 37
). Ventral setae subequal,
1a
35
35,
3a
31
33 (31–35),
4a
35
32 (31–35). Aggenital shield entire, belt–shaped with two pairs of subequal setae,
ag
1
20
18 (16–20) and
ag
2
18
17 (14–18). Anal area with three pairs of pseudanal setae,
ps1
5
6 (5–6),
ps
2
12
12 (11–12),
ps
3
16
13 (9–16) (
Figure 38
). Aedeagus as in
Figure 39
.
Gnathosoma.
Subcapitulum bearing two pairs of adoral setae (
ro1
,
ro2
) and two pairs of subcapitular setae,
m
31
31 (30–31) and
n
43
45
(43–47). Distances between subcapitular setae:
m–m
42
41 (39–44),
n–
n
31
31 (29–32) and
m–
n
8
9 (8–9) (
Figure 40
). Movable cheliceral digits
40
36 (34–40), in length. Palpi five-segmented; palptarsus with a tridentate terminal eupathidium, one subterminal spine-like eupathidium, one solenidion and four smooth setae; palptibia with a large claw, a robust accessory claw and two proximal setae; palpgenu with one smooth seta; palpfemur with two smooth and one barbed setae (
Figure 41
).
FIGURES 36–41.
Agistemus macrosetosus
Stathakis & Kapaxidi
n. sp.
(male). 36. Dorsum; 37. Venter; 38. Anal region (dorsal view); 39. Aedeagus; 40. Subcapitulum; 41. Palp. Scale bar = 100 Μm for 36, 37; 30 Μm for 38, 39, 40, 41.
FIGURES 42–45.
Agistemus macrosetosus
Stathakis & Kapaxidi
n. sp.
(male). 42. Leg I; 43. Leg II; 44. Leg III; 45. Leg IV. Scale bar = 100 Μm.
Legs
(
Figures 42–45
). Length of legs: legI
290
284 (270–290), legII
246
238 (222–246), legIII
238
236 (222– 242), legIV
266
260 (250–266). Counts of setae and solenidia on legs I–IV: coxae 2+1
elcp
, 1, 2, 2; trochanters 1, 1, 1, 1; femora 5, 4, 2, 2; genua 3+1
κ
, 1, 0, 0; tibiae 5+1
φp
, 5+1
φp
, 5+1
φp
, 5+1
φp
; tarsi 12+2
ω
, 9+2
ω
, 7+1
ω
, 7+1
ω
. Length of spines and solenidia:
κ
I
4
4,
ω
I
29
26
(23–29),
ω
I♂
34
34 (31–37),
ω
II
26
26
(25–27),
ω
II♂
32
32 (28– 34),
ω
III
16
16
(14–17),
ω
IV
17
18
(14–20).
Type
material.
Holotype
female collected at Kaiafas Lake, Co. Elia, on
Rubus
sp. (
Rosaceae
),
11 June 2011
. One female
paratype
collected at Kaiafas Lake, Co. Elia, on
Rubus
sp. (
Rosaceae
),
27 October 2012
. The allotype male, four male and five female
paratypes
collected at Lefkochora, Co. Messinia, on
Rubus
sp. (
Rosaceae
),
17 March 2013
.
The
holotype
female, allotype male, six female and five male
paratypes
are deposited in the Acari collection of Laboratory of Agricultural Zoology and Entomology, Agricultural University of Athens,
Greece
. One female
paratype
will be deposited in the Natural History Museum, London (NHM).
Etymology.
The name of this new species is derived from its very long dorsal setae (
macro
=long +
setosus
).
Remarks.
This new species has the same leg chaetotaxy as
Agistemus takagii
Ehara
,
Agistemus longisetus
Gonzales-Rodriguez
and
Agistemus riograndensis
Johann & Ferla. It
resembles
A
.
takagii
in havingthe aggenital shield divided along its midline, with two subequal aggenital setae, but differs from it by having most dorsal setae longer and the ratio
vi
/
vi–vi
4.8
4.6 (4.4–5.0) instead of
1.1 in
the latter. It resembles
A. longisetus
in having equal lengths of most dorsal setae and ratio
pob
/eye but it differs from it by having
vi
/
vi–vi
4.8
4.6 (4.4–5.0) instead of
2.6–2.7 in
the latter. It also resembles
A. riograndensis
in having equal lengths of most dorsal setae and ratio
vi
/
vi– vi
but differs from it by having the aggenital shield divided along its midline instead of an entire horseshoe-shaped aggenital shield in
A. riograndensis
. Moreover, the postocular body of
A. riograndensis
is about twice as long as the eye in diameter, while in
A
.
macrosetosus
n. sp.
, the postocular body is 3.4 times the diameter of eye.