Revision of the genus Athyreacarus (Acari: Athyreacaridae)
Author
Khaustov, Alexander A.
Author
Frolov, Andrey V.
text
Zootaxa
2019
2019-07-26
4647
1
168
225
journal article
25551
10.11646/zootaxa.4647.1.14
a96b3ef7-5c39-4d0b-8d35-43706a9802c0
1175-5326
3352927
4AD08401-412E-4A7C-AAD4-3B524B8DBB8F
Athyreacarus latus
sp. nov.
(
Figs 38–42
)
Description
.
Female
(
Figs 38–42
). Body oval. Length of idiosoma 435 (415), width 305 (285).
Gnathosoma
. Gnathosomal capsule, excluding palps, almost oval, length 62 (60), width 65 (64). Two pairs of barbed, blunt-ended cheliceral setae
cha
29 (26) and
chb
25 (19). Postpalpal setae (
pp
) 5 (5) needle-like. Setae
m
11 (11) and
n
57 (50) weakly barbed; setae
m
blunt-ended,
n
pointed. Setae
dFe
13 (14) and
dGe
31 (30) barbed;
dFe
blunt-ended,
dGe
pointed. Tibial claw small, slightly hooked with short basal projection.
FIGURE 34
.
Athyreacarus pusillus
sp. nov.
, female: A—left leg I in dorsal view, B—left leg II in dorsal view.
Idiosomal dorsum
(
Figs 38A
,
41A
,
42A, B
). All dorsal shields with numerous large sparsely distributed dimples (
Figs 42A, B
). Hysterosomal shields wide, completely covering hysterosoma. Prodorsal shield without lateral projections. Setae
sc
1
and their alveoli absent. All dorsal setae weakly barbed. Setae
c
2
and
f
pointed, other dorsal setae blunt-ended. Cupules and pore-like structures on hysterosomal tergites not evident. Pseudanal segment much shorter than tergite H. Lengths of dorsal setae:
v
1
44
(32),
v
2
13
(12),
sc
2
155 (155),
c
1
10 (18),
c
2
165 (165),
d
24 (21),
e
14 (16),
f
160 (160),
h
1
135 (115),
h
2
29 (28). Distances between setae:
v
1
–
v
1
53
(54),
v
2
–v
2
85
(80),
sc
2
–sc
2
130 (120),
c
1
–
c
1
135 (125),
c
1
–
c
2
75 (75),
d–d
150 (135),
e–e
165 (150),
f–f
175 (165),
h
1
–
h
1
92 (82),
h
1
–
h
2
23 (20).
Idiosomal venter
(
Figs 38B
,
41B
,
42C, D
). All ventral plates with numerous large dimples (
Fig. 42C, D
). Setae 3
a
smooth, other ventral setae weakly barbed. Setae 2
c
, 4
c
and
ps
3
blunt-ended, other ventral setae pointed. Ap5 long, reaching beyond bases of setae 4
a
. Aggenital plate with two pairs of aggenital setae. Anal opening ventral. Length of mid-sternal plate 70 (61), width 50 (46); ratio length/width 1.3–1.4. Lengths of ventral setae: 1
a
52 (51), 1
b
22 (18), 1
c
21 (21), 2
a
75 (53), 2
b
43 (41), 2
c
24 (26), 3
a
19 (18), 3
b
59 (51), 3
c
32 (31), 4
a
40 (39), 4
b
47/50 (48), 4
c
22 (21),
ag
1
36 (31),
ag
2
56 (48),
ps
1
90/95 (93),
ps
2
110 (110),
ps
3
60 (43/50).
FIGURE 35
.
Athyreacarus pusillus
sp. nov.
, female: A—left leg III in dorsal view, B—left leg III in dorsal view.
Legs
(
Figs 39
,
40
). Length of legs: I 155 (160),
II
160 (150),
III
180 (180),
IV
215 (200). Leg I (
Fig. 39A
): tarsal claw very thick; setae
v’
of trochanter,
d
,
v’
of femur,
d
,
l’
,
v’
,
k
of tibia,
pl’
,
s
, and
pv”
of tarsus smooth, other leg setae (except eupathidia) weakly barbed; setae
v’
of trochanter,
l’
,
l”
,
v’
of femur,
d
,
v’
of genu,
v’
,
k
of tibia, and
pv”
of tarsus blunt-ended, other leg setae pointed; lengths of solenidia
ω
1
16 (15),
ω
2
12 (10),
φ
1
12 (12),
φ
2
12 (10);
ω
1
digitiform,
ω
2
,
φ
1
and
φ
2
baculiform. Leg
II
(
Fig. 39B
): solenidion
ω
14 (13) digitiform, solenidion
φ
10 (10) baculiform; all leg setae barbed; setae
v’
of trochanter and
l’
of femur, blunt-ended; other leg setae pointed. Leg
III
(
Fig. 40A
) similar in shape and length to leg
II
: solenidion
φ
10 (10) baculiform; all leg setae barbed; setae
v’
of femur and
l”
of genu blunt-ended; other leg setae pointed. Leg
IV
(
Fig. 40B
): solenidion
φ
10 (10) baculiform; all leg setae barbed; setae
v’
of femur,
l”
of genu, and
p’
of tarsus blunt-ended, other leg setae pointed.
FIGURE 36
. Phase-contrast micrographs of
Athyreacarus pusillus
sp. nov.
, female: A—general aspect dorsally, B—general aspect ventrally.
Type material
. Female
holotype
, slide No. ZISP T-Ath-002, no locality data, on a beetle
Athyreus
cf.
bifurcatus
MacLeay.
Paratype
:
1 female
, same data.
Type deposition
.
The
holotype
is deposited in the collection of the Zoological Institute of RAS,
Saint Petersburg
,
Russia
;
one
paratype
is deposited in the collection of the
Tyumen State
University Museum of Zoology
,
Tyumen
,
Russia
.
Differential diagnosis
. The new species is most similar to
A. ovalis
by the presence of two pairs of cheliceral setae, absence of cupules and pore-like structures on the hysterosomal tergites and thick apodemes 1. The new species differs from
A. ovalis
by the complete absence of setae
sc
1
(vs alveoli of setae
sc
1
present in
A. ovalis
), very short and blunt-ended setae
c
1
and
d
(vs very long and pointed in
A. ovalis
), and presence of only two pairs of aggenital setae (vs three pairs in
A. ovalis
).
Etymology
. The name of new the species derives from Latin word “
latus
” meaning “
wide
” and refers to very wide body of a new species.
Remarks.
According to
Howden & Martínez (1977)
,
Athyreus bifurcatus
is distributed in
Brazil
(as far north as the state of
Mato Grosso
),
Paraguay
and northern
Argentina
(
Misiones Province
). The host specimen lacks any locality data but we think it originated from either
Paraguay
or south-eastern
Brazil
as did most of the other older specimens of
Bolboceratinae
in the ZIN collection.