A review of the genus Tycherobius (Acari: Camerobiidae), with descriptions of four new species from Australia
Author
Fan, Qing-Hai
Author
Walter, David E.
text
Zootaxa
2006
1121
1
52
journal article
50772
10.5281/zenodo.171702
1edf6823-9117-4b17-bf91-eb07b79403d4
11755326
171702
Tycherobius stipula
sp. n.
(Plate 1–4;
Figs. 1–8
,
33
)
Material examined
Holotype
: adult female, from grasstree litter, 27°33'S, 153°03'E, Toohey Forest, Nathan, Brisbane, Queensland,
Australia
, coll. H.C. Proctor,
5 Sept 1999
. In QM.
Paratypes
:
1 adult
male, same data as
holotype
except coll. (D.E. Walter),
6 Aug 1997
;
1 adult
female, from wetsandy heath litter, 25°57'S, 153°00'E, Rainbow Beach, Cooloola, Queensland,
Australia
, coll. J. Beard,
7 Sept 1997
;
1 adult
female,
2 adult
male, same data as
holotype
except date (
21.viii.1999
). In
UQIC
.
Diagnosis
Adult female. Peritremes with 2 loops; palptarsus with 2 + 1 eupathidium + 1;
pdx
present; idiosomal setae broadly clavate and subequal in length;
c1
:
c2
= 0.9,
d1
:
d2
= 1.4,
e1
:
e2
= 1.2,
f1
:
f2
= 1.0,
c1
:
d1
:
e1
:
f1
= 1.0: 1.1: 1.2: 1.2; femora I–IV with 4, 3, 3, 2; tarsi I–II with 10 + 1, 8 + 1.
Adult male. As adult female but: h1 much shorter than other setae;
c1
:
c2
= 0.7,
d1
:
d2
= 1.1,
e1
:
e2
= 0.9,
c1
:
d1
:
e1
:
f1
= 1.2: 1.3: 1.1: 1.0; tibia I with an additional long terminal solenidion and each tarsus with an enlarged and slightly elongate solenidion.
FIGURE 1.
Tycherobius stipula
sp. n.
(adult female). Dorsal view of idiosoma.
FIGURE 2.
Tycherobius stipula
sp. n.
(adult female). Ventral view of idiosoma.
Description
ADULT
FEMALE (Plate 1–4;
Figs. 1–4
)
Gnathosoma
. Stylophore stumpy, 55; movable digits 27; peritremes with 2 loops. Palp 45; counts of setae and solenidia from trochanter to tarsus: 0, 2, 1, 3 + 1 claw, 2 + 1 eupathidia + 1 solenidion (). Subcapitular setae
m
20, distance
m–m
, 28.
Idiosoma
. Nearly circular in shape, 301 long, 227 wide. Prodorsum bearing one pair of eyes,
10 in
diameter, one pair of postocular bodies,
14 in
diameter, and five pairs of distally expanded setae,
vi
40
,
ve
28,
sci
28,
sce
27,
pdx
22; ratio
vi
:
ve
= 1.4; distances:
vi–
vi
32,
vi–ve
27,
vi–pdx
37,
ve–sci
32,
sci–sce
47. Hysterosoma bearing ten pairs of setae,
c1
26,
c2
29,
d1
29,
d2
21,
e1
31
,
e2
26
,
f1
31,
f2
30,
h1
27,
h2
16; ratios
c1
:
c2
= 0.9,
d1
:
d2
= 1.4,
e1
:
e2
= 1.2,
f1
:
f2
= 1.0,
c1
:
d1
:
e1
:
f1
= 1.0: 1.1: 1.2: 1.2; distances:
c1–c1
17,
c1–c2
97,
c1–d1
62,
d1–d1
21,
d1–d2
67,
d1–
e
1
44,
e1–
e
1
15,
e1–
e
2
65,
e1–f1
50,
f1–f1
15,
f1–f2
50,
f1–h1
47,
h1–h1
17,
h1–h2
20. Venter with three pairs of setae,
1a
20,
3a
25,
4a
18; coxal setae
1c
about 1.5x of
1b
,
1b
18,
1c
27. Aggenital setae small,
ag
12. Genitoanal valves with one pair of genital setae,
g
12, and three pairs of pseudanal setae,
ps3
10,
ps2
10,
ps1
11.
FIGURE 3.
Tycherobius stipula
sp. n.
(adult female). A, B, chelicerae; C, subcapitulum; D, E, palp.
FIGURE 4.
Tycherobius stipula
sp. n.
(adult female). A, leg I; B, leg II; C, leg III; D, leg IV.
Legs
. Length (from base of trochanter to tip of tarsus): leg I 491, leg II 392, leg III 457, leg IV 515. Setae on genua clavate, length:
I 26
, II
23, III 22
, IV 27. Tibiae I–IV each with a solenidion:
I 9
,
II 6
,
III 5
,
IV 5.
Tarsi I–II each with a solenidion:
I 6
,
II 4.
Counts of setae and solenidia on legs I–IV: coxae
1a
+ 2, 1, 2, 2; trochanters 1, 1, 1, 1; femora 4, 3, 3, 2; genua 1 + 1, 1 + 1, 1, 1; tibiae 9 + 1, 8 + 1, 7 + 1, 7 + 1; tarsi 10 + 1, 8 + 1, 7, 7.
ADULT MALE (Plate 4;
Figs. 5–8
)
Gnathosoma
. Stylophore stumpy, 52; movable digits 23; peritremes with 2 loops. Palp 45; counts of setae and solenidia from trochanter to tarsus: 0, 2, 1, 3 + 1 claw, 2 + 1 eupathidia + 1 solenidion (). Subcapitular setae,
m
18, distance
m–m
, 20.
FIGURE 5.
Tycherobius stipula
sp. n.
(adult male). Dorsal view of idiosoma.
Idiosoma
. Nearly circular in shape, 255 long, 206 wide. Prodorsum bearing one pair of eyes,
9 in
diameter, one pair of postocular bodies,
13 in
diameter, and five pairs of clavate setae,
vi
30
,
ve
25,
sci
23,
sce
15,
pdx
16; ratio
vi
:
ve
= 1.2; distances:
vi–
vi
31,
vi–ve
25,
vi– pdx
27,
ve–sci
35,
sci–sce
37. Hysterosoma bearing ten pairs of setae,
c1
19,
c2
28,
d1
20,
d2
18,
e1
18
,
e2
19
,
f1
16,
f2
20,
h1
14,
h2
18; ratios
c1
:
c2
= 0.7,
d1
:
d2
= 1.1,
e1
:
e2
= 0.9,
f1
:
f2
= 0.8,
c1
:
d1
:
e1
:
f1
= 1.2: 1.3: 1.1: 1.0; distances:
c1–c1
12,
c1–c2
87,
c1–d1
57,
d1–d1
14,
d1–d2
62,
d1–
e
1
35,
e1–
e
1
13,
e1–
e
2
62,
e1–f1
34,
f1–f1
13,
f1–f2
42,
f1–h1
17,
h1–h1
10,
h1– h2
37. Venter with three pairs of setae,
1a
15,
3a
20,
4a
15; coxal setae
1c
1.3x of
1b
,
1b
15,
1c
20. Aggenital and genital setae absent; genitoanal valves with four pairs of setae,
g
10,
ps3
10,
ps2
11,
ps1
13.
FIGURE 6.
Tycherobius stipula
sp. n.
(adult male). Ventral view of idiosoma.
Legs
. Length (from base of trochanter to tip of tarsus): leg I 503, leg II 405, leg III 447, leg IV 505. Setae on genua clavate, subequal, length:
I 25
, II
22, III 22
, IV 25. Tibiae I with two solenidia,
I 2 55
, I 1 8; tibiae II–IV each with one solenidion:
II 6
,
III 5
,
IV 5
; ratio
I 2
:
I 1
= 6.9,
I 2
: II = 9.2. Tarsi I–IV each with one enlarged solenidia:
I 21
, II
20, III 15
, IV 15. Counts of setae and solenidia on legs I–IV: coxae
1a
+ 2, 1, 2, 2; trochanters 1, 1, 1, 1; femora 4, 3, 3, 2; genua 1 + 1, 1 + 1, 1, 1; tibiae 9 + 2, 8 + 1, 7 + 1, 7 + 1; tarsi 10 + 1, 8 + 1, 7 + 1, 7 + 1.
Remarks
Adult females of this species are very similar to that of
T. aotearoa
Fan & Zhang,
2005
in having similar structure of peritremes, chaetotaxy of palptarsus and legs, but differ from the latter in the idiosomal setae being broadly clavate and subeuqal in length;
c1
:
c2
= 0.9,
d1
:
d2
= 1.4,
e1
:
e2
= 1.2,
f1
:
f2
= 1.0,
c1
:
d1
:
e1
:
f1
= 1.0: 1.1: 1.2: 1.2 (vs:
d1
and
e1
obviously longer than others).
| Etymology |
| The specific name comes from |
Latin |
word |
“stipulus”, |
meaning |
stalk, |
in |
reference |
to |
| the shape of dorsal idiosomal setae. |
FIGURE 7.
Tycherobius stipula
sp. n.
(adult male). A, chelicerae; B, palp; C, subcapitulum; D, dorsal opisthosoma; E, genitoanal area; F, G, aedeagus and genitoanal area.
.
FIGURE 8.
Tycherobius stipula
sp. n.
(adult male). A, leg I; B, leg II; C, leg III; D, leg IV.
PLATE 4.
Tarsi I (left side, female; right side male). A, B,
Tycherobius stipula
sp. n.
; C, D,
T. australis
sp. n.
; E,
T. acicula
sp. n.
; F,
T. elongata
sp. n.