Taxonomic revision of the family Eosentomidae (Hexapoda: Protura) from Japan 2701
Author
Nakamura, Osami
text
Zootaxa
2010
2010-12-03
2701
1
109
journal article
11755334
Eosentomon yambaru
Nakamura
sp. nov.
Figs. 55–56
;
Table 23
Type specimens.
Holotype
female (
NSMT
–Ap 526),
Mt. Nishime
–dake,
Kunigami
–son,
Okinawa
Island
,
Okinawa Prefecture
,
26°47'48''N
,
128°16'29''E
,
327 m
elevation,
6-VII-2001
,
S. Karasawa
et al.
leg
.
Paratypes
:
2 males
(
NSMT
–Ap 527–528), same data as for the holotype
.
Other specimens examined.
One male, one maturus junior, same locality as for the holotype,
27-II-2003
,
S. Karasawa
et al.
leg
.
Description.
Body length 741 (748–830) µm. Head 128 (122–128) µm long, 97 (96) µm wide. Setae
aa
,
pa
and
m4
present, sensilla
as
and
ps
present (
Fig. 55A
); seta
sp
1.7 times longer than
p
; sensilla
pp
rudimentary. Labral setae present (
Fig. 55B
). Seta
rs
inflated, shorter than
sr
(
Fig. 55B
). On maxillary palpus (
Fig. 55C
) sensillum
md
distinctly longer than
ml.
On galea (
Fig. 55D
) digit O slightly longer than M and I. Mandible with two or three teeth (
Fig. 55E
). Clypeal apodemes distinct (
Figs. 55A, B
). Pseudoculus without inner structure (
Figs. 55A, F
), 10 (10–11) µm long,
PR
= 13 (11–12).
Foretarsus length (
Figs. 55G, H
) 107 (108–109) µm; claw 22 (22) µm, TR = 5.1 (5.0–5.1); empodium 22 (22) µm, EU = 1.0; sensillum
s
as long as claw. Sensillum
t1
slightly nearer to α
3'
than α
3
, BS = 1.2 (1.0–1.2);
t2
thin;
t3
thin, surpassing tarsus;
a
broadened;
b
surpassing base of β
6
;
c
linear;
d
reaching base of
f2
;
e
and
g
roundedspatulate and long;
f1
thin, reaching base of γ
5
;
f2
shorter than
f1
;
a'
slightly broadened, reaching base of
b’1
;
b'1
between bases of δ
3'
and δ
4'
, reaching base of
b’2
;
b'2
reaching base of α
6
;
c'
anterior to α
6
, reaching base of δ
6
. Length of middle tarsus 53 (47–52) µm, length of claw 16 (15–16) µm; hind tarsus 67 (63–66) µm, claw 18 (16– 17) µm; both empodia short and less than 1/7 of claw length (
Fig. 55I
), 2 µm long; on hind tarsus (
Fig. 55I
)
D2
and
D4
spine-like,
D4
more slender than
D2
.
Tracheal
camerae short and distally contracted.
Central
lobe trapezoidal and inner line incised (
Fig. 56A
).
Laterostigmata II
–IV large, with no inner structure; those of
V
and
VI
small. On female squama genitalis (
Fig. 56B
) caput processus of duck’s head
type
, filum processus short, small accessory sclerotization present, proximo-lateral sclerotization present. Male squama genitalis with short basiperiphallar setae
.
Chaetotaxy as in
Table 23
. On thoracic tergites II–III,
P1a
and
P2a
seta-like;
P1a
posterior to
P1–P2
;
P2a
slightly nearer to
P2
than to
P3
.
P1a
on abdominal tergite I,
P1a
and
P2a
on II–VI and
P2a
on VII filiform, but shorter than
P1
;
P1a
on VII short, slightly capitulate (
Fig. 56E
), 4 µm long, at hind margin; on tergite VIII (
Fig. 56F
)
P1a'
with basal dilatation and slightly anterior to
P2
;
P2a'
short linear.
Diagnosis.
The present species is similar to
E. riyuetanense
Nakamura
from
Taiwan
(
Nakamura, 1997
) and
E. daii
Yin
from
China
(Yin, 1982, 1999). These three species have in common a pseudoculus without inner structure, the position of
P1a
at the hind margin of abdominal tergite VII, foretarsal sensillum
t1
near α
3'
, and the presence of
b'1
. However, this new species is different from
E. riyuetanense
in having two pairs of anterior setae on abdominal tergite VI (three pairs in
E. riyuetanense
), seta
rs
shorter than
sr
(same length as
sr
in
E. riyuetanense
), capitulate
P1a
on abdominal tergite VII (linear in
E. riyuetanense
) and basal dilatation of
P1a'
on abdominal tergite VIII (not dilated in
E. riyuetanense
); and from
E. daii
in having three, two and one pairs of anterior setae on abdominal tergites V–VII, respectively, (four pairs on V–VI and two pairs on VII in
E. daii
), and the presence of median sclerotization on the female squama genitalis (absent in
E. daii
).
Etymology.
The specific name, a noun in apposition, is derived from the name of the northern part of
Okinawa
Island, Yambaru, where the
type
locality is involved.
Distribution.
Japan
(
Okinawa
, known from only the
type
locality).