A new species of the genus Paralycus Womersley, 1944 (Acari, Oribatida, Pediculochelidae) from Shikoku-island, Japan
Author
Oshima, Masaharu
Faculty of Science, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto, 606 - 8502 Japan
Author
Shimano, Satoshi
Science Research Center, Hosei University, Fujimi 2 - 17 - 1 Chiyoda-ku, Tokyo, 102 - 8160 Japan
text
Zootaxa
2024
2024-12-23
5556
1
218
225
https://doi.org/10.11646/zootaxa.5556.1.16
journal article
10.11646/zootaxa.5556.1.16
1175-5326
14595111
80014195-21FF-4A2B-B840-79DA99ACDDBA
Paralycus subiasi
Oshima & Shimano
sp. nov.
[Japanese name: Koke-oboro-dani]
(
Figures 1–3
)
Materials Examined.
Holotype
:
adult female
,
Japan
,
Torigajo-catsle, Yamanouchi
,
Touon City
,
Ehime Prefecture
,
28-VI-2004
, coll.
M. Shiba
from the moss on the bark of L
yonia ovalifolia
var.
elliptica
(Siebold & Zucc.) Hand.
- Mazz.
Type deposition.
Holotype was deposited in the Collection of
Arachnida
, Department of Zoology, National Museum of Nature and Science, Tokyo (
NSMT
) [collection number:
NSMT-Ac 14773
].
Diagnosis. Female
Rostral seta long, reaching half the length of chelicera. Bases of lamellar setae slightly adjacent. Cheliceral seta
cha
shorter than half length of chelicera. Gastronotal setae
d
1
and
e
1
not reaching bases of next row of setae;
c
2
reaching base of
c
p
seta;
f
1
and
h
1
reaching bases of next row of setae. Epimeral seta
2a
relatively short, not exceeding base of
1a
. Epimeral seta
4a
absent. Four pairs of genital setae present; distance
g
3
–
g
4
<
g
1
–
g
2
<
g
2
–
g
3
. Leg trochanteral formula 0-0-0-0. Four setae on genu I;
d
, (
l
) and
v′
, genu II with two setae (
l
). Solenidion
ω
of tarsus I not expanding in middle; solenidion
φ
of tibia III short.
Description. Female
Measurements
. Idiosomal length 199, width 66.
Integument
. Colorless, elongate and weakly sclerotized. Prodorsal shield, legs and coxae smooth. Dorsal side (except segment H and P), ventral side, chelicerae (basal part), and ovipositor finely striated.
Gnathosoma
. Subcapitulum (28 × 24) with three pairs of filiform, smooth setae (
a
11;
m
12;
h
9) and two pairs of filiform and smooth adoral setae (2, 4). Palp (22) simple, with four free segments; femur and genu separated by incomplete suture. Palpal setae formula: 0-1-0-1-9+
ω
, including four eupathidia (
sul
,
acm
,
ul
;
sul
,
acm
,
ul′
with expanded tips);
inf
absent. Postpalpal seta (
ep
2) blunt. Chelicera (22) with two filiform and smooth setae (
cha
4;
chb
7);
cha
shorter than half of cheliceral length. Pharyngeal cupola long, reaching level of
bs
.
Prodorsum.
Mid-dorsal region covered with shield-shaped plate, bearing two pairs of filiform and smooth setae (
ro
14;
le
21);
ro
reaching half the length of chelicera. Bases of setae
le
slightly adjacent. In dorsolateral region, three pairs of filiform setae (
in
,
exa
,
exp
) and one pair of clavate bothridial setae (
bs
) present;
in
(32),
exa
(13),
exp
(3) and
bs
(15 × 7) smooth.
Notogaster.
Three transverse scissures divide notogaster into four regions;
tf
1
and
tf
2
faint while
tf
3
conspicuous. Sixteen pairs of notogastral setae present. Four pairs of setae in region of segment C:
c
1
(10), c
2
(16),
c
3
(18) and
c
p
(26). Four pairs of setae in region of segment DE:
d
1
(14),
d
2
(17),
e
1
(22) and
e
2
(23). Two pairs of setae in region of segment F:
f
1
(35) and
f
2
(30). Segments H and P fused with six pairs of setae:
h
1
(30),
h
2
(30),
h
3
(21),
p
1
(21),
p
2
(25) and
p
3
(10). All gastronotal setae filiform and smooth, not expanded at their bases. Seta
c
2
reaching base of
c
p
;
d
1
not reaching base of
e
1
;
e
1
not reaching base of
f
1
;
f
1
reaching base of
h
1
;
h
1
reaching base of
p
1
. Seta
p
2
longer than
p
1
. Notogastral cupules absent.
FIGURE 1.
Paralycus subiasi
sp. nov.
, female, light microscope images: A, dorsal view; B, ventral view; C, solenidion
ω
I; D, solenidion
φ
III. Scale bars, 50 μm (A, B), 10 μm (C, D).
Epimeral and podosomal regions
. Epimeral setation 3-2-3-2;
1а
(7),
1b
(10),
1с
(7),
2a
(13),
2b
(12),
3a
(4),
3b
(11),
3c
(6),
4b
(8) and
4c
(3) filiform and smooth. Seta
2a
not reaching base of
1a
. Bases of
3a
close to each other. One pair of triangular supracoxal setae (
el
2) with rounded tips.
Anogenital region
. Four pairs of genital setae:
g
1
(7),
g
2
(4),
g
3
(9) and
g
4
(8). Distance
g
3
–
g
4
<
g
1
–
g
2
<
g
2
–
g
3
. Two pairs of minutes eugenital setae (3) and two pairs of genital papillae within genital orifice. Three pairs of adanal setae:
ad
1
(14),
ad
2
(33),
ad
3
(7) and two pairs of anal setae:
an
1
(7),
an
2
(6). All anogenital setae filiform and smooth. Aggenital setae absent. Genital, anal and adanal plates absent. Genital tracheae reduced and represented by short cavities.
FIGURE 2.
Paralycus subiasi
sp. nov.
, female: A, dorsal view; B, ventral view. Scale bar, 100 μm.
FIGURE 3.
Paralycus subiasi
sp. nov.
, female: A, leg I, left, dorsal view; B, leg II, left, dorsal view; C, leg III, left, dorsal view; D, leg IV, left, dorsal view; E, palp, left, dorsal view. Scale bars, 25 μm (A–D), 10 μm (E).
Legs
. Relatively short. Measurements (total length from trochanter to tarsus, pretarsus excluded): I 46, II 36, III 36, and IV 38. Leg structure simple with highly visible five segments. Famulus
ε
of tarsus I bacilliform, thin and expanded at end; other setae filiform and smooth. Solenidion
ω
of tarsus I 5 × 1 not expanding in middle;
ω
of tarsus II 3 × 1 small and not expanding in middle. Solenidion
φ
of tibia I elongated and attenuate;
φ
of tibia III short (1) and bacilliform. Formula of leg setation (from trochanter to tarsus, solenidia in brackets): I 0-2-4-2(1)-9(1); II 0-2-2-3-6(1); III 0-2-0-2(1)-5; IV 0-2-0-2-5. Claws absent on all tarsi, each tarsus with minute empodial remnant and caruncle-like membrane.
Male
Unknown.
Immatures
Unknown.
Etymology.
This species is named in honor of our esteemed colleague, Prof. Dr. Luis S. Subías, who made a great contribution to the knowledge of the diversity of oribatid mite species in the world.
Remarks.
Paralycus subiasi
sp. nov.
is most similar to
P. shibai
Oshima & Shimano,
2024
in having four pairs of genital setae and the absence of epimeral seta
4a
. However,
P. subiasi
sp. nov.
differs from
P. shibai
in the following characteristics: gastronotal setae
c
2
and
f
1
longer, reaching the bases of the
c
p
and
h
1
setae, respectively (
c
1
and
f
1
not reaching the bases of the
c
p
and
h
1
setae, respectively, in
P. shibai
); epimeral seta
2a
shorter, not reaching the tip of
1a
(exceeding the tip of
1a
in
P. shibai
); genual seta
d
on leg II absent (present in
P. shibai
); trochanteral setae
v′
on leg III absent (present in
P. shibai
).
Paralycus pyrigerus
(
Berlese, 1905
)
which was described inadequately, also has long gastronotal setae
f
1
and
h
1
, but
P. subiasi
sp. nov.
has shorter setae
e
1
, which do not reach the base of
f
1
(extending beyond the base of
f
1
in
P. pyrigerus
).
Additionally, for the labelling of epimeral setae, we do not follow the ontogenetic criterion (see the remark
15 in
Norton & Franklin 2018
), in fact we follow
Kolesnikov
et al.
(2023)
. However, we need to correct a mistaken statement in our previous paper: only in
Fig. 2B
of
Oshima
et al.
(2024)
, the “
4b
” and “
4c
” should be changed to “
4c
” and “
4b
”, respectively.