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 similis
sp. nov.
(
Figs 21–25
)
Description
.
Female
(
Figs 21–25
). Body broadly fusiform. Length of idiosoma 320 (320–345), width 165 (165– 190).
Gnathosoma
. Gnathosomal capsule, excluding palps, almost oval, length 47 (44–47), width 47 (46–53). One pair of barbed, blunt-ended cheliceral setae
cha
24 (22–25). Postpalpal setae (
pp
) 12 (9–12) needle-like. Setae
m
16 (12–16) and
n
42 (36–44) pointed. Setae
m
smooth,
n
barbed. Setae
dFe
16 (10–16) and
dGe
26 (24–28) weakly barbed; setae
dFe
blunt-ended,
dGe
pointed. Tibial claw slightly hooked.
FIGURE 19
. Phase-contrast micrographs of
Athyreacarus variabilis
sp. nov.
, female: A—prodorsal shield, B—central part of tergites D and EF, C—anterior sternal plate, D—aggenital and midsternal plates and part of coxal fields IV.
FIGURE 20
. Phase-contrast micrographs of
Athyreacarus variabilis
sp. nov.
, female:A—prodorsal shield without a pair of se- tae
v
2
, B— prodorsal shield without left seta
v
2
, C— prodorsal shield with unusually long right seta
v
2
, D—ventral opisthosoma with additional aggenital setae (arrowed).
FIGURE 21
.
Athyreacarus similis
sp. nov.
, female: A—dorsum of body, B—venter of body.
Idiosomal dorsum
(
Figs 21A
,
24A
,
25A, B
). All dorsal shields with numerous sparsely distributed dimples (
Figs 25A, B
). Hysterosomal shields D and EF relatively narrow, not covering approximately 1/3 of hysterosomal dorsum. Prodorsal shield without lateral projections. Setae
sc
1
vestigial. All dorsal setae weakly barbed. Setae
v
2
and
e
blunt-ended, other dorsal setae pointed. Cupules
ia
on tergite D,
im
,
ip
on tergite EF and
ih
on tergite H large, round. Cupules
ih
located dorsally, anterolaterally to bases of setae
h
1
. Pseudanal segment much shorter than tergite H. Lengths of dorsal setae:
v
1
54
(50–57),
v
2
28
(22–32),
sc
2
94 (93–96),
c
1
61 (60-62),
c
2
120 (110–120),
d
90 (87–91),
e
19 (18–21),
f
105 (105–110),
h
1
81 (76–85),
h
2
49 (48–52). Distances between setae:
v
1
–v
1
18
(17–20),
v
2
–v
2
49
(48–50),
sc
1
–sc
1
59 (58–61),
sc
2
–sc
2
47 (43–48),
c
1
–
c
1
51 (49–52),
c
1
–
c
2
40 (40–46),
d–d
55 (52–57),
e–e
46 (43–46),
f–f
56 (53–56),
h
1
–
h
1
37 (32–37),
h
1
–
h
2
16 (16–18).
FIGURE 22
.
Athyreacarus similis
sp. nov.
, female: A—right leg I in dorsal view, B—right leg II in dorsal view.
FIGURE 23
.
Athyreacarus similis
sp. nov.
, female: A—right leg III in dorsal view, B—right leg III in dorsal view.
Idiosomal venter
(
Figs 21B
,
24B
,
25C, D
). All ventral plates with numerous dimples (
Figs 25C, D
), dimples on aggenital and midsternal plates arranged slightly more densely than on other plates. All ventral setae weakly barbed. Setae 1
b
, 2
c
, 3
a
,
ag
1
,
ps
2
,
ps
3
blunt-ended, other ventral setae pointed. Ap5 short, located near base of legs
IV
. Aggenital plate with three pairs of aggenital setae. Anal opening terminal. Length of mid-sternal plate 60 (59–64), width 47 (47–51); ratio length/width 1.2–1.3. Lengths of ventral setae: 1
a
29 (27–31), 1
b
16 (14–17), 1
c
20 (18–21), 2
a
40 (33–41), 2
b
30 (24–30), 2
c
16 (14–19), 3
a
15 (15–18), 3
b
28 (25–29), 3
c
23 (20–25), 4
a
27 (23–28), 4
b
30 (28–32), 4
c
21 (16–22),
ag
1
20 (17–21),
ag
2
35 (32–37),
ag
3
34 (31–37),
ps
1
51 (46–52),
ps
2
55 (51–57),
ps
3
36 (31–37).
Legs
(
Figs 22
,
23
). Length of legs: I 110 (110–115),
II
105 (105–110),
III
110 (110–115),
IV
140 (140–145). Leg I (
Fig. 22A
): setae
v’
of femur and
k
of tibia smooth, other leg setae (except eupathidia) weakly barbed; setae
l’
,
v’
of femur,
d
,
v’
of genu,
v’
and
k
of tibia blunt-ended, other leg setae (except eupathidia) pointed; lengths of solenidia
ω
1
12 (11–12),
ω
2
8 (8),
φ
1
11 (11),
φ
2
8 (6–8);
ω
1
digitiform,
φ
1
weakly clavate,
ω
2
and
φ
2
baculiform. Leg
II
(
Figs 22B
): solenidion
ω
13 (12–13) digitiform, solenidion
φ
8 (7–8) baculiform; all leg setae weakly barbed; seta
l’
of femur blunt-ended, other leg setae pointed. Leg
III
(
Fig. 23A
) similar in shape and length to leg
II
; solenidion
φ
8 (7–8) baculiform; all leg setae pointed and weakly barbed. Leg
IV
(
Fig. 23B
): solenidion
φ
8 (7–8) baculiform; all leg setae weakly barbed; setae
l”
of genu, and
p’
of tarsus blunt-ended, other leg setae pointed.
Type material
. Female
holotype
, slide No. ZISP T-Ath-001,
BOLIVIA
,
Chiquitano
[dry forests],
16°24’S
61°11’W
,
430 m
.
, human feces,
16.I.2010
, Vidaurre et al. leg., on a beetle
Neoathyreus centromaculatus
(Felsche)
.
Paratypes
:
8 females
, same data
.
Type deposition
. The
holotype
and two
paratypes
are deposited in the collection of the Zoological Institute of RAS,
Saint Petersburg
,
Russia
;
other
paratypes
are deposited in the collection of the
Tyumen State
University Museum of Zoology
,
Tyumen
,
Russia
.
FIGURE 24
. Phase-contrast micrographs of
Athyreacarus similis
sp. nov.
, female: A—general aspect dorsally, B—general aspect ventrally.
FIGURE 25
. Phase-contrast micrographs of
Athyreacarus similis
sp. nov.
, female: A—prodorsal shield, B—tergites D and EF, C—anterior sternal plate, D—aggenital and midsternal plates and part of coxal fields III and IV.
Differential diagnosis
. The new species is very similar to
A. magnificus
sp. nov.
and
A. variabilis
sp. nov.
by the absence of setae
chb
, presence of three pairs of aggenital setae, setae
sc
1
vestigial, and setae
c
1
well developed.
The new species differs from
A. magnificus
and
A. variabilis
by the median ends of apodemes 3 and 4 almost connected (vs. median ends of apodemes 3 and 4 clearly separated in
A. magnificus
and
A. variabilis
). The new species differs from
A
.
magnificus
by having a smaller idiosoma (
320–345 in
A. similis
vs
440–465 in
A. magnificus
), and setae (
pl
) on tarsus I, (
tc
) on tarsi
II
and
III
and
tc’
on tarsus
IV
pointed (vs spatulate in
A. magnificus
). The new species differs from
A. variabilis
by the absence of subcuticular reticulation on the prodorsal shield and tergite C (vs weak subcuticular reticulation present on prodorsal shield and tergite C in
A. variabilis
), large, sparsely distributed dimples on the idiosomal plates (vs very small, densely distributed dimples on the idiosomal plates in
A. variabilis
), and by setae
tc”
on tarsi
II
and
III
and
tc’
on tarsus
IV
pointed (spatulate in
A
.
variabilis
).
Etymology
. The name of the new species derives from the Latin word “
similis
” meaning “
similar
” and refers to similarity of the new species to the closely related
A. magnificus
and
A. variabilis
.