Seven new species of Spatulaphorus Rack (Acari: Pygmephoridae) phoretic on scarab beetles (Coleoptera: Scarabaeidae)
Author
Khaustov, Alexander A.
Tyumen State University, Tyumen, 6 Volodarskogo Str., 625003 Russia.
Author
Frolov, Andrey V.
Zoological Institute of Russian Academy of Sciences, Universitetskaya Embankment 1, 199034, Saint Petersburg, Russia
Author
Akhmetova, Lilia A.
Zoological Institute of Russian Academy of Sciences, Universitetskaya Embankment 1, 199034, Saint Petersburg, Russia
text
Zootaxa
2024
2024-08-26
5497
3
337
368
http://dx.doi.org/10.11646/zootaxa.5497.3.2
journal article
10.11646/zootaxa.5497.3.2
1175-5326
13618611
C107D617-5F70-42C5-8FD4-E5C2DE0E48B1
Spatulaphorus brevisetosus
sp. nov.
(
Figs 1–4
)
Description
. FEMALE. Body well sclerotized. Length of idiosoma 195 (175–255), width 105 (105–150).
Gnathosoma
. Gnathosomal capsule, excluding palps, subrectangular, length 21 (21–23), width 21 (21–24). Dorsum with one pair of needle-like cheliceral setae (
cha
) 5 (4–5). Dorsal median apodeme present, poorly developed. Postpalpal setae (
pp
) 2 (2) needle-like, situated laterad setae
cha
. Ventral gnathosoma with one pair of smooth, weakly blunt-tipped subcapitular setae
m
5 (5–6) and round pits
n
situated posteriad
m
. Palps with smooth and weakly blunt-tipped setae
dFe
3 (2–3) and
dGe
6 (6) dorsolaterally. Palps ventrally each with mushroom-like accessory setigenous structure (
ass
) and tiny solenidion
ω
. Palps terminated with small blunt-tipped tibial claw and tiny eupathid-like seta. Pharyngeal pumps poorly visible.
FIGURE 2
.
Spatulaphorus brevisetosus
sp. nov.
, female: A—left leg I, dorsal aspect; B—left leg II, dorsal aspect.
Idiosomal dorsum
(
Figs 1A
,
4A
). All dorsal shields with big puncta. Prodorsal shield with three pairs of setae
(
v1
,
v2
,
sc2
), one pair of weakly barbed capitate trichobothria (
sc1
) and one pair of round stigmata. Stigmata associated with well-developed tracheal trunks. All dorsal idiosomal setae blunt-tipped; setae
v2
,
e
and
h2
with few minute barbs, other dorsal setae distinctly barbed. Alveoli of setae
e
and
f
clearly separated. Cupules
ia
on tergite D,
im
on tergite EF and
ih
on tergite H large, round, subequal. Lengths of dorsal setae:
v1
20 (20–25),
v2
11 (11–13),
sc2
29 (29–38),
c1
26 (26–33),
c2
29 (29–32),
d
28 (28–33),
e
15 (15–19),
f
28 (28–35),
h1
31 (31–40),
h2
11 (11–15). Distances between setae:
v1–v1
20 (20–24),
v2–v2
30 (30–35),
sc2–sc2
32 (32–38),
c1–c1
34 (34–42),
c1–c2
19 (19–22),
d–d
44 (44–54),
e–f
7 (7–8),
f–f
39 (39–47),
h1–h1
32 (32–40),
h1–h2
10 (10–11).
FIGURE 3
.
Spatulaphorus brevisetosus
sp. nov.
, female: A—left leg III, dorsal aspect; B—left leg IV, dorsal aspect.
Idiosomal venter
(
Figs 1B
,
4B
). Coxisternal fields I–II and aggenital plate laterally with sparsely distributed big puncta. Setae
1b
pointed and weakly barbed; other ventral setae smooth and blunt-tipped. Bases of setae
ps3
situated distinctly anteriad bases of setae
ps1-2.
Apodemes 1 (ap1) and apodemes 2 (ap2) well-developed and joined with thick prosternal apodeme (appr); sejugal apodeme (apsej) developed only laterally; apodemes 3 (ap3) weak, not reaching poststernal apodeme (appo); apodemes 4 (ap4) well developed, exceeding beyond bases of setae
3b
. Apodemes 5 (ap5) short, joined with appo and reaching bases of setae
4a
. Anterior genital sclerite (ags) small, cup-like; posterior genital sclerite (pgs) small, oval. Posterior margin of posterior sternal plate weakly concave in middle part. Posterior margin of aggenital plate rounded. Lengths of ventral setae:
1a
9 (9–10),
1b
16 (16–18),
1с
9 (9–12),
2a
12 (12–13),
2с
9 (9–11),
3a
10 (10–13),
3b
9 (9–12),
3c
11 (11–14),
4a
9 (9–12),
4b
14 (14–19),
4c
10 (10–13),
ps1
11 (11–13),
ps2
12 (12–14),
ps3
11 (11–12).
Legs
(
Figs 2
,
3
). Leg I (
Fig. 2A
). Leg setation: Tr 1 (v’), Fe 4 (
d
,
l’
,
l”
,
v”
), Ge 2 (
l’
,
l”
), TiTa 17(4) (
p’ϛ
,
p”ϛ
,
tc’ϛ
,
tc”ϛ
,
ft’ϛ
,
ft”ϛ
,
k
,
pl’
,
pl”
,
pv’
,
pv”
,
s
,
d
,
l’
,
l”
,
v’
,
v”
,
ω1
,
ω2
,
φ1
,
φ2
). Tibiotarsus enlarged, with large claw; tibiotarsus internally with oval strongly sclerotized structure near solenidion
φ2
. Setae (
u
) consolidated into a horn-like structure opposing claw. Tarsal claw blunt-tipped. Seta
d
of femur spatulate, with short subterminal projection. Setae
l’
of femur,
k
and
pl’
of tibiotarsus smooth; other leg setae (except eupathidia
p’
,
p”
,
tc’
,
tc”
,
ft’
,
ft”
) sparsely barbed. Setae
l’
,
l”
of femur,
l”
of genu and
k
of tibiotarsus blunt-tipped; other leg setae (except eupathidia) pointed. Lengths of solenidia
ω1
8 (8–9),
ω2
4 (4–5),
φ1
7 (7–8),
φ2
4 (4–5); Solenidion
φ1
thick, clavate,
ω1
digitiform; other solenidia weakly clavate. Leg II (
Fig. 2B
). Leg setation: Tr 1 (
v’
), Fe 3 (
d
,
l’
,
v”
), Ge 1 (
l’
), Ti 4 (
d
,
l’
,
v’
,
v”
), Ta 6(1) (
pl”
,
tc’
,
tc”
,
u’
,
pv’
,
pv”
,
ω
). Tarsus with thickened basally claws and pad-like empodium. Solenidion
ω
5 (5) weakly clavate, solenidion
φ
absent. Seta u
’
smooth, other setae barbed; setae
tc’
and
pl”
of tarsus spiniform, blunt-tipped; setae
d
,
l’
, and
v”
of femur blunt-tipped; other leg setae pointed. Leg III (
Fig. 3A
). Femur divided into basi- and telofemur. Leg setation: Tr 1 (
v’
), Fe 2 (
d
,
v’
), Ge 1 (
l’
), Ti 4 (
d
,
l’
,
v’
,
v”
), Ta 6 (
pl”
,
tc’
,
tc”
,
u’
,
pv’
,
pv”
). Claws and empodium of same shape as on tarsus II. Setae
v’
of trochanter and
u’
of tarsus smooth, other setae barbed; seta
pl”
of tarsus spiniform; setae
v’
of trochanter,
d
,
v’
of femur, and
l’
of genu blunt-tipped, other leg setae pointed; solenidion
φ
absent. Leg IV (
Fig 3B
). Femur divided into basi- and telofemur. Leg setation: Tr 1 (
v’
), Fe 2 (
d
,
v’
), Ge 0, Ti 4 (
d
,
l’
,
v’
,
v”
), Ta 6 (
pl”
,
tc’
,
tc”
,
u’
,
pv’
,
pv”
). Claws simple, empodium as on tarsi II and III. Seta
v’
of trochanter smooth, other setae barbed; setae
v’
of trochanter,
d
,
v’
of femur,
v”
of tibia and
pl”
of tarsus blunt-tipped, other leg setae pointed; solenidion
φ
absent.
FIGURE 4
. DIC micrographs of
Spatulaphorus brevisetosus
sp. nov.
, female: A—general view dorsally; B—general view ventrally.
MALE unknown.
Type material
. Female
holotype
, slide
ZISP
T-Pygm-010,
USA
, Georgia,
Blackbeard Island
.
8-9.VII.1970
(
CEMT
),
on
Phanaeus igneus
MacLeay
;
paratypes
:
17 females
, same data
.
Type deposition
.
The
holotype
and
four paratypes
are deposited in the collection of
Zoological Institute
of RAS,
Saint Petersburg
,
Russia
;
other
paratypes
are deposited in the collection of the
Tyumen State
University Museum of Zoology
,
Tyumen
,
Russia
.
Differential diagnosis
. The new species is most similar to
S
.
mexicanus
Trejo-Palacios, 2023
, described from
Mexico
(
Trejo-Palacios
et al.
2023
), in having spiniform setae
pl”, tc’
on tarsus II and
pl”
on tarsus III. The new species differs from
S
.
mexicanus
in having setae
e
and
f
as well as
h1
and
h2
distinctly separated (vs. alveoli of setae
e
and
f
as well as
h1
and
h2
contiguous in
S
.
mexicanus
) and in having smooth setae
ps1-3
(vs. barbed in
S. mexicanus
).
Etymology
. The name of the new species is a combination of to Latin words:
brevis
meaning
short
, and
seta
meaning
bristle
, and refers to relatively short dorsal idiosomal setae.