Revision of Tyroborus Oudemans, 1924 (Acari: Astigmata: Acaridae)
Author
Fan, Qing-Hai
Author
Zhang, Zhi-Qiang
text
Zootaxa
2006
1152
1
43
journal article
50623
10.5281/zenodo.172161
c4bcb69e-639c-4f6f-963e-36a2265c7ae2
11755326
172161
Tyroborus lini
Oudemans, 1924
(
Figs. 1–5
, Plate 1)
Tyroborus lini
Oudemans, 1924a
: 307
; 1924b: 325;
Hughes, 1976
: 68
.
Tyrolichus lini
: Zahkvatkin, 1941: 98
;
Robertson, 1946
: 197
.
Tyrophagus
(
Tyroborus
)
lini
:
Nesbitt, 1945
: 176
.
Tyrophagus lini
:
Hughes, 1961
: 46
.
Material examined
Type
: 1/
1 male
,
THE
NETHERLANDS
: “in oud lnzaad, Arnhem,
Oct 1923
, Oudemans” (
RMNH
Acari P 6875).
Diagnosis
MALE. Supracoxal seta
scx
broadly widened at bases of pectinations, bearing 21–24 pectinations;
d1
about 3.5× length of
c1
and 4.6× length of
d2
;
d2
about 0.8× length of
c1
; aedeagus tapering from base to tip, apical end small, straight, lateral arms supporting aedeagus turning outwards; ratio I ': " = 0.7, (a+b): c = 4.1; solenidia
I 1
and II moderately slender, cylindrical, not widened at apex.
Description
MALE (
Fig. 1–5
, Plate 1)
Idiosoma. 331 long, 211 wide. Chelicera 88 long,
cha
conical, 6 long, subcapitular setae
m
36, palpal supracoxal seta
elcp
16–18 long, apically bifurcate, dorsal palptibial seta 18, lateral palptibial seta 25, dorsal palptarsal seta 16, palptarsal solenidion 4.
Dorsum. Prodorsal shield nearly pentagonal in shape and obviously punctate, 70 long, 88 wide between
veve
. Eyespots not observed. Grandjean’s organ fingerlike, 10 long, its basal lobe with 3 obvious spiniform teeth; supracoxal seta
scx
broadly widened at bases of pectinations, 31 long, bearing 21–24 pectinations. All dorsal idiosomal setae sparsely pectinated. Ratios:
vi
:
ve
= 2.3,
sci
:
sce
= 1.4,
scisci
:
scisce
= 1.5. Lengths of setae:
vi
71
,
ve
31,
sci
132,
sce
94; distances:
vivi
8,
vive
40,
scisci
36,
scisce
24. Hysterosomal setae
d1
about 3.5× length of
c1
and 4.6× length of
d2
;
d2
about 0.8× length of
c1
; lengths of setae:
c1
24,
c2
136,
c p
111,
c3
24,
d1
close to
c1
, 83 long,
d2
18,
e1
202,
e2
137,
f2
243,
h1
252,
h2
197,
h3
157; distances:
c1c1
78,
c1d1
30,
d1d1
35,
d2gla
37,
d1
e
1
73,
e1
e
1
72.
Venter. Setae
1a
40;
3a
20;
3b
39;
g
20,
4a
38. Aedeagus tapering from base to tip, 30 long, with one major curve and a small reverse apical end, internal diameter uniform throughout its apical part; lateral arms supporting aedeagus turning outwards. Anal slit 50. Anal suckers about
30 in
diameter; anal discs
4 in
diameter, distance between right and left discs 33. Pseudanal setae
ps1
about 81 long,
ps2
34 long,
ps3
15;
ps1ps1
34,
ps2ps2
48.
FIGURE 1.
Tyroborus lini
Oudemans
(male). Dorsal view of idiosoma.
Leg I. 156 long; femur
I 43
,
vF
simple, 36 long; genu
I 34
, ' 22, " 30, I ': " = 0.7,
cG
27,
mG
33; tibia
I 26, 93
,
gT
24,
hT
18; length of tarsus I (excluding claw) about 1.7× width, 42 long, 25 wide, 1 moderately slender, cylindrical, not widened at apex, 15 long, 3.5, 2 7, 3 23, distance between
aa
and 1 about 8,
aa
17 long,
ba
16,
wa
16,
ra
25,
la
17,
d
27,
e
stout, 6,
f
14,
s
stout, 7,
u
and
v
stout, 7,
p
and
q
absent, claw 14.
FIGURE 2.
Tyroborus lini
Oudemans
(male). Ventral view of idiosoma.
FIGURE 3.
Tyroborus lini
Oudemans
(male). A, ventral view of chelicera; B, ventral view of apical part of chelicera; C, ventral view of subcapitulum; D, Grandjean's organ; E, F, supracoxal seta; G, prodorsal shield; H, lateral view of aedeagus.
FIGURE 4.
Tyroborus lini
Oudemans
(male). A, coxae I–IV; B, ventral view of aedeagus and anus; C, tarsus I; D, solenidion on tarsus II; E, tarsus IV.
FIGURE 5.
Tyroborus lini
Oudemans
(male). A, leg I; B, leg II; C, leg III; D, leg IV.
PLATE 1.
Tyroborus lini
Oudemans
(male). A, prodorsal shield; B, supracoxal seta; C, aedeagus; D, solenidia on tarsus I; E, solenidion on tarsus II; F, tarsus IV.
Leg II. 153 long; femur
II 45
,
vF
44; genu
II 31, 20
,
cG
27,
mG
30; tibia
II 23, 81
,
gT
21,
hT
21; length of tarsus II (excluding claw) about 1.9× width, 38 long, 20 wide, not widened at apex, 16 long,
ba
16,
wa
16,
ra
15,
la
25,
d
31,
e
7,
f
11,
s
stout, 7,
u
and
v
stout, 7,
p
and
q
absent, claw 14.
Leg III. 150 long; femur
III 33
; genu
III 27, 13
,
nG
33; tibia
III 25, 69
,
kT
28; length of tarsus III (excluding claw) about 2.3× width, tarsus
III 39
long, 17 wide,
w
22,
r
17,
d
24,
e
6,
f
15,
s
stout, 7,
u
and
v
stout, 7,
p
and
q
absent, claw 13.
Leg IV. 163 long; femur 35,
wF
27; genu
IV 31
; tibia
IV 27, 68
,
kT
26; length of tarsus IV (excluding claw) about 2.7× width, tarsus
IV 46
long, 17 wide,
w
and
r
situated at level between suckers,
w
29 long,
r
20 long, distance between basal rim of tarsus IV and proximal sucker
d
13, between
d
and
e
21, between
e
and
f
8, ratio (a+b): c = 4.1 (
Fig. 4
E),
f
25,
s
stout, 7,
u
and
v
stout, 7,
p
and
q
absent, claw 12.
FEMALE AND LARVA
According to
Hughes (1976)
, idiosoma in female is 331 long and 211 wide; setae
sci
in larva are much shorter than
sce
. Claparède organs are cylindrical.
Habitats and distribution
Tyroborus lini
was first described from old linseeds by
Oudemans (1924a)
and has since been found infesting stored products or indoor materials from countries in Palaearctic, Nearctic, Afrotropical, Oriental, and Australian Regions (
Table 2
). It takes 14 to 17 days to complete its life cycle at 23o C, 87 R.H. on wheat germ (
Hughes 1976
). No deutonymphal stage (hypopus) is known.
TABLE 2
. Habitats and distribution of
Tyroborus lini
Oudemans.
Distribution Host Reference
China
Chinese medicine
Li, 1999