Austrostigmaeus gen. n. (Acari: Prostigmata: Stigmaeidae), with the description of a new species from AustraliaAuthorFan, Qing-HaiAuthorBeard, Jennifer J.textZootaxa200612113551journal article5075810.5281/zenodo.172491fc9d22a0-4ad6-4449-a010-5f03b8d9000711755326172491Austrostigmaeus walterisp. n.(Figs. 1–12; Plates 1–2)Diagnosis
Adult female. Ratio
vi
:
vi–vi
= 3.9 (3.3–3.9),
ve
:
ve–sci
= 2.2 (1.8–2.2); central area of hysterosoma striated,
c1–c1
:
d1–d1
:
e1–e1
:
f1–f1
= 1.1: 1.1: 1.0: 1.2,
c1
:
c1–c1
= 0.6,
d1
:
d1–d1
= 0.2,
e1
:
e1–e1
= 1.0; 3 pairs of aggenital setae each on a platelet; tarsi 13 + 1, 9 + 1, 7
, 7.
Adult male. Palptarsus basally angled; subcapitulum broadly expanded, nearly as wide as idiosoma;
vi
:
vi–vi
= 1.9 (1.9–2.6),
ve
:
ve–sci
= 2.0,
c1–c1
:
d1–d1
:
e1–e1
:
f1–f1
= 1.4 (1.3–1.4): 1.2: 1.0: 1.0,
c1
:
c1–c1
= 0.5,
d1
:
d1–d1
= 0.2 (0.2–0.3),
e1
:
e1–e1
= 0.8; aggenital setae situated on an undivided shield; tarsi 13 + 2, 9 + 2, 7, 7.
Material examinedHolotype
adult female:
Australia
: Western
Australia
, Kimberley Region, Galvan's Gorge, 16°47'55"S, 125°50'39"E,
30 Oct 2000
, J.J. Beard, small shrub with lightly pubescent leaves,
1 female
on a slide.
Paratypes
:
2 adult
females each on 1 slide,
4 adult
males on 3 slides, 2 deutonymph females each on 1 slide; same data as
holotype
.
DescriptionADULT FEMALE (n = 3)Yellow to dark orange in life.Gnathosoma
(Figs. 1–2). Chelicera slender, 77 (77–83) long; movable digit less than 1/2 of chelicera, 34 (33–35) long. Palp 60 (58–66) long; accessory claw setalike; setation from palptrochanter to palptarsus: 0, 3, 1, 3 + 1 claw, 4 + 1 + 1 subterminal spinelike eupathidium + 3 basally fused eupathidia; palptarsus normal, not basally angled; setae
ba
,
bp
and
lp
simple, setiform; solenidion more than 1/2 of palptarsus, 10 (10–11) long. Subcapitulum normal, not broadly expanded as in adult male, subcapitular setae
n
2.6
(2.1–2.6)x length of
m
,
m
= 23 (23–25),
n
= 60 (53–61); distance
m–m
about 1.4 (1.3–1.4)x distance
n–n
,
m–m
= 30 (29–31),
n–n
= 22 (22–23),
m–n
= 7 (7–9).
FIGURE 1.Austrostigmaeus walteri
sp. n.
(adult female). A, dorsal view
of idiosoma; B,
chelicerae; C, palp; D, palpal tibia and
tarsus; E, dorsal view of opisthosoma; F,
dorsal idiosomal
setae.
FIGURE 2.Austrostigmaeus walterisp. n.
(adult female). A, ventral view of idiosoma; B, subcapitulum; C, genitoanal area; D, pretarsus II.
Idiosoma
(Figs. 1–2; Plates 1–2). Oval, 293 (279–292) long, 191 (162–192) wide. Dorsal idiosomal setae sparsely barbed. Prodorsum with a small plain shield bearing 2 pairs of setae (
vi
and
ve
) and a pair of eyes; setae
sci
on platelets;
pob
not observed;
sce
absent; eye 7 (7–8) in diameter, ratio
vi
:
vi–vi
= 3.9 (3.3–3.9),
ve
:
ve–sci
= 2.2 (1.8–2.2); setal lengths:
vi
27
(26–27),
ve
48 (44–49),
sci
40 (36–41); distances:
vi–
vi
7 (7–8),
vi–ve
20 (20–21),
ve–sci
22 (22–25),
ve–ve
31 (31–32),
sci–sci
66 (66–74). Central area of hysterosoma striated, without obvious shield; setae
c1
,
c2
,
d1
,
d2
,
e1
,
e2
and
f1
situated on small platelets,
c2
,
d1
,
d2
,
e2
and
f1
much shorter than others; ratio
c1–c1
:
d1–d1
:
e1–e1
:
f1–f1
= 1.1: 1.1: 1.0: 1.2,
c1
:
c1–c1
= 0.6,
d1
:
d1–d1
= 0.2,
e1
:
e1–e1
= 1.0 (0.9–1.0); setal lengths:
c1
33 (31–33),
c2
20 (20–24),
d1
13 (13–14),
d2
13 (13–14),
e1
47
(43–47),
e2
15
(14–15),
f1
13 (13–14); distances:
c1–c1
54 (54–56),
c1–c2
62 (62–67),
c1–d1
50 (45–51),
d1–d1
54 (54–61),
d1–d2
47 (46–47),
d1–
e
1
47 (45–53),
e1–
e
1
47 (47–50),
e1–
e
2
30 (30–36),
e1–f1
22 (16–22),
f1–f1
56 (56–64). Suranal shield entire, bearing 2 pairs of barbed setae,
h1
= 32 (32–33),
h2
= 24 (24–26),
h1–h1
= 22 (22–25),
h1–h2
= 20 (19–20). Ventral setae
4a
situated posterior to coxae IV,
1a
27 (24–27),
3a
23 (22–25),
4a
21 (18–21). Aggenital area with 3 pairs of subequal setae, each on a platelet,
ag3
thicker than other two pairs,
ag1
13,
ag2
12 (12–13),
ag3
11; distances
ag1–ag2
= 15 (13–16),
ag2–ag3
= 15 (15–21); genital opening with a pair of setae (
g
), 14 long; pseudanal setae
ps3
14 (14–15),
ps2
14 (14–16),
ps1
12 (12–13).
FIGURE 3.Austrostigmaeus walterisp. n.
(adult female). A, leg I; B, leg II; C, leg III; D, leg IV.
Legs
(
Figs. 2–3
; Plate 2). Length: leg I 146 (146–153), leg II 115(111–121), leg III 118 (114–120), leg IV 138 (138–147). Setae
d
of femur I and genu I sparsely barbed, 21 (21–23) and 20 (20–25) long, respectively. Leg tarsal claw absent; membranous arolium developed; empodium rodlike, arising from arolium and bearing 3 Yshaped tenent hairs. Setae
v
on leg I and II,
v
and
v”
on leg III and IV very long and barbed. Counts of setae and solenidia on legs I–IV: coxae 2 + 1
elc
I, 1, 2, 2; trochanters 1, 1, 1, 1; femora 5, 4, 2, 2; genua 3 + 1, 1, 0, 0; tibiae 5 + 1 p, 5 + 1 p, 5 + 1 p, 5 + 1 p; tarsi 13 + 1, 9 + 1, 7
, 7. Lengths of solenidia:
I 17
(17–19),
II 20
(15–20),
III 10
(9–10),
IV 6
(6–8).
ADULT MALE (n = 3)Gnathosoma
(
Figs. 4–5
; Plate 2). Chelicera slender, 78 (76–81) long; movable digit less than 1/2 of chelicera, 36 (34–36) long. Palp very strong, 93 (93–105) long; accessory claw setalike; setation from palptrochanter to palptarsus: 0, 3, 1, 3 + 1 claw, 4 + 1 + 1 subterminal spinelike eupathidium + 3 basally fused eupathidia; palptarsus basally angled as members of
Summersiella
; setae
ba
,
bp
and
lp
simple, setiform; solenidion more than 1/2 of palptarsus, 13 long. Subcapitulum broadly expanded, nearly as wide as idiosoma, subcapitular setae
n
2.3
x length of
m
,
m
= 23 (22–24),
n
= 53 (51–54); distance
m–m
about 1.6x distance
n–n
,
m–m
= 50 (44–50),
n–n
= 31 (31–33),
m–n
= 10 (10–11).
Idiosoma
(
Figs. 4–5
; Plate 1). Oval, 237 (228–240) long, 118 (118–120) wide. Dorsal idiosomal setae sparsely barbed. Prodorsum with a small plain shield bearing 2 pairs of setae (
vi
and
ve
) and a pair of eyes; setae
sci
on platelets;
pob
not observed;
sce
absent; eye 7 (7–8) in diameter, ratio
vi
:
vi–vi
= 1.9 (1.9–2.6),
ve
:
ve–sci
= 2.0; setal lengths:
vi
25
(23–25),
ve
44 (36–44),
sci
31 (28–31); distances:
vi–
vi
13 (9–13),
vi–ve
24 (23–25),
ve–sci
22 (21–23),
ve–ve
36 (35–37),
sci–sci
64 (64–70). Hysterosoma with a pair of small shields between setae
d2
; setae
c1
,
d1
,
d2
,
e1
,
e2
and
f1
situated on small platelets,
c2
,
d1
,
d2
,
e2
and
f1
much shorter than others; ratio
c1–c1
:
d1–d1
:
e1–e1
:
f1–f1
= 1.4 (1.3–1.4): 1.2: 1.0: 1.0,
c1
:
c1–c1
= 0.5,
d1
:
d1–d1
= 0.2 (0.2–0.3),
e1
:
e1–e1
= 0.8; setal lengths:
c1
27 (24–28),
c2
22 (21–24),
d1
13 (12–13),
d2
13 (12–13),
e1
36
(36–37),
e2
13
(12–13),
f1
14 (13–14); distances:
c1–c1
60 (53–60),
c1–c2
35 (33–38),
c1–d1
40 (39–41),
d1–d1
53 (48–53),
d1–d2
30 (27–32),
d1–
e
1
30 (29–31),
e1–
e
1
45 (43–45),
e1–
e
2
21 (17–21),
e1–f1
17 (16–17),
f1–f1
44 (41–44). Suranal shield entire, bearing 2 pairs of barbed setae;
h1
thin, much shorter than
h2
,
h1
:
h2
= 0.5 (0.4–0.5);
h1
= 8,
h2
= 17 (17–19),
h1–h1
= 10,
h1–h2
= 12 (12–13). Ventral setae
4a
situated posterior to coxae IV,
1a
22 (20–22),
3a
23 (20–23),
4a
20 (17–20). Aggenital area with 3 pairs of setae, all on an undivided shield,
ag3
thicker than other two pairs, lengths:
ag1
12 (12–13),
ag2
12 (12–14),
ag3
13 (13–14); distances
ag1–ag2
= 15 (12–15),
ag2–ag3
= 10 (10–15); genital setae absent; pseudanal setae
ps1
small, 6 (5–6),
ps2
12 (12–13),
ps1
12.
FIGURE 4.Austrostigmaeus walterisp. n.
(adult male). A, dorsal view of idiosoma; B, chelicerae; C, palp; D, palpal tarsus; E, dorsal view of opisthosoma; F, dorsal idiosomal setae.
FIGURE 5.Austrostigmaeus walterisp. n.
(adult male). A, ventral view of idiosoma; B, subcapitulum; C, genitoanal area; D, pretarsus III.
Legs
(
Figs. 5–6
). Length: leg I 152 (139–155), leg II 108 (103–111), leg III 109 (106–109), leg IV 136 (131–141). Setae
d
of femur I and genu I sparsely barbed, 23 (20–23) and 16 (16–21) long, respectively. Leg tarsal claw absent; membranous arolium developed; empodium rodlike, arising from arolium and bearing 3 Yshaped tenent hairs. Setae
v
on leg I and II,
v
and
v”
on leg III and IV very long and barbed. Counts of setae and solenidia on legs I–IV: coxae 2 + 1
elc
I, 1, 2, 2; trochanters 1, 1, 1, 1; femora 5, 4, 2, 2; genua 3 + 1, 1, 0, 0; tibiae 5 + 1 p, 5 + 1 p, 5 + 1 p, 5 + 1 p; tarsi 13 + 2, 9 + 2, 7
, 7. Lengths of solenidia:
I 1 23
(20–24),
I 2 34
(33–34),
II 1 28
(27–29),
II 2 32
(29–33),
III 12
, IV 12.
DEUTONYMPH FEMALE (n = 2)Gnathosoma
(
Figs. 7–8
). Chelicera slender, 66 (63–66) long; movable digit 27 (27–28). Palp 42 (42–44) long; accessory claw setalike; setation from palptrochanter to
PLATE 1.Austrostigmaeus walterisp. n.
(A–B, adult female; C, adult male). A, prodorsum; B, hysterosoma; C, idiosoma.
FIGURE 6.Austrostigmaeus walterisp. n.
(adult male). A, leg I; B, leg II; C, leg III; D, leg IV.
palptarsus: 0, 3, 1, 3 + 1 claw, 4 + 1 + 1 subterminal spinelike eupathidium + 3 basally fused eupathidia; palptarsus not basally angled; setae
ba
,
bp
and
lp
simple, setiform; solenidion more than 1/2 of palptarsus, 7 long. Subcapitulum not broadly expanded as adult male, subcapitular setae
n
2.3
x length of
m
,
m
= 16 (16–18),
n
= 36 (33–36); distance
m–m
about 1.3x distance
n–n
,
m–m
= 23 (23–24),
n–n
= 18 (18–19),
m–n
= 4.
Idiosoma
(
Figs. 7–8
). Oval, 224 (218–224) long, 137 (122–137) wide. Dorsal idiosomal setae sparsely barbed. Prodorsum with a small plain shield bearing 2 pairs of setae (
vi
and
ve
) and a pair of eyes; setae
sci
on platelets;
pob
not observed;
sce
absent; eye
PLATE 2.Austrostigmaeus walterisp. n.
(A–C, adult female; D–E, adult male). A, genitoanal area; B, leg II; C, pretarsus II; D, palpi; E, subcapitulum.
7 in
diameter, ratio
vi
:
vi–vi
= 3.3,
ve
:
ve–sci
= 1.8; setal lengths:
vi
23
(23–30),
ve
42 (42–43),
sci
28 (27–28); distances:
vi–
vi
7,
vi–ve
18,
ve–sci
23 (21–23),
ve–ve
30 (30–32),
sci–sci
66 (66–67). Central area of hysterosoma faintly straited; setae
c1
,
c2
,
d1
,
d2
,
e1
,
e2
and
f1
situated on separate small platelets,
c2
,
d1
,
d2
,
e2
and
f1
much shorter than others; ratio
c1–c1
:
d1–d1
:
e1–e1
:
f1–f1
= 1.3 (1.2–1.3): 1.3 (1.2–1.3): 1.0: 1.2,
c1
:
c1–c1
= 0.6 (0.5–0.6),
d1
:
d1–d1
= 0.2,
e1
:
e1–e1
= 1.0; setal lengths:
c1
24 (23–24),
c2
27 (25–27),
d1
9,
d2
10,
e1
38
(37–38),
e2
10
,
f1
10; distances:
c1–c1
53 (44–53),
c1–c2
59,
c1–d1
40 (36–40),
d1–d1
50 (43–50),
d1–d2
37 (34–37),
d1–
e
1
37 (37–39),
e1–
e
1
40 (37–40),
e1–
e
2
28 (27–28),
e1–f1
17 (12–17),
f1–f1
46 (45–46). Suranal shield entire, bearing 2 pairs of barbed setae,
h1
= 23 (23–24),
h2
= 16 (16–18),
h1–h1
= 18 (15–18),
h1–h2
= 11 (10–11). Ventral setae
1a
18 (18–19),
3a
19 (18–19),
4a
13 (13–15). Aggenital area with 3 pairs of subequal setae, each on a separate platelet,
ag3
thicker than other two pairs,
ag1
10,
ag2
10,
ag3
11; distances
ag1–ag2
=12 (12–14),
ag2–ag3
= 8 (7–8); genital setae absent; pseudanal setae
ps3
12 (11–12),
ps2
12 (10–12),
ps1
10.
FIGURE 7.Austrostigmaeus walterisp. n.
(deutonymph female). A, dorsal view of idiosoma; B, chelicerae; C, palp.
Legs
(
Fig. 9
). Length: leg I 105 (105–114), leg
II 76
(76–80), leg
III 78
(78–86), leg
IV 91
(91–95). Setae
d
of femur I and genu I sparsely barbed, 11 (11–13) and 13 (13–14) long, respectively. Leg tarsal claw absent; membranous arolium developed; empodium rodlike, arising from arolium and bearing 3 Yshaped tenent hairs. Setae
v
on leg I and II,
v
and
v”
on leg III and IV very long and barbed. Counts of setae and solenidia on legs I–IV: coxae 2 + 1
elc
I, 1, 2, 2; trochanters 1, 1, 1, 0; femora 5, 4, 2, 2; genua 3 + 1, 1, 0, 0; tibiae 5 + 1 p, 5 + 1 p, 5 + 1 p, 5 + 1 p; tarsi 13 + 1, 9 + 1, 7, 7. Lengths of solenidia:
I 14
(13–14),
II 16
(14–16),
III 7
(6–7),
IV 6
(5–6).
Etymology
The species is named after Dr David Evans Walter (University of Alberta,
Canada
) who has broadened our knowledge of acarology.