Revision of the genus Exochomoscirtes Pic (Coleoptera: Scirtidae: Scirtinae) 2598
Author
Ruta, Rafał
Author
Yoshitomi, Hiroyuki
text
Zootaxa
2010
2010-08-31
2598
1
1
80
https://biotaxa.org/Zootaxa/article/view/zootaxa.2598.1.1
journal article
10.11646/zootaxa.2598.1.1
11755334
10095059
B7D2F686-CE7A-42AE-8395-4527E587C565
Exochomoscirtes nipponicus
sp. nov.
(
Figs. 14D
,
57
,
58
)
Type material.
Holotype
, male (
EUM
):
“[
JAPAN
] the
Ryukyus
/ Iriomote-jima Is. /
Aira-gawa
/
6 – V – 1999
/ T. SHIMADA leg.” [printed label]; “genitalia in slide / No. HY 1124” [printed & handwritten label].
Paratypes
. Female (
EUM
):
“Botanical Garden / Banna, Ishigaki I. /Ryukyus /
16.IV.1974
/
H. Makihara
leg.” [printed label]; “Collection / of Ent. Lab. /
Ehime
Univ.” [blue, printed label].
Male (
EUM
):
“Mariudo, Irio / mote-Jima, /
27-III-1994
/
M. Matsumara
” [handwritten label]; “Collection / of Ent. Lab. /
Ehime
Univ.” [blue, printed label].
Female (
EUM
):
“[RYÛKYÛ:
Japan
] /
Mt. Omoto Ishigaki-shi
/ {Altitude: 150–200} /
7.V.2003
/
T. Kurihara
leg.” [printed label]; “Collection / of Ent. Lab. /
Ehime
Univ.” [blue, printed label].
Male (
EUM
):
“LOOCHOO / Is. ISHIGAKI / Takeda /
20.III.1962
/
Y. Arita
leg.” [printed label]; “Collection / of Ent. Lab. /
Ehime
Univ.” [blue, printed label].
Female (
EUM
):
“[RYÛKYÛ:
Japan
] /Riv. Aira Taketomichô /
29.IV.2003
/
T. Kurihara
leg.” [printed label]; “Collection / of Ent. Lab. /
Ehime
Univ.” [blue, printed label].
Female (
EUM
):
“(
Light Trap
) / Omoto / Ishigaki-jima /
25–29.III.1998
/
H. Yoshitomi
leg.” [printed label]; “
Collection
/ of Ent. Lab. /
Ehime
Univ.” [blue, printed label]
.
Diagnosis.
The species is similar to
E. nahangensis
sp. nov.
, but is distinctly larger, tergite
8 in
males is much longer, and prehensor is widened in basal half (very narrow in
E. nahangensis
).
Description.
Holotype
, male. Body elongate oval, TL/EW 1.6, slightly flattened, covered with suberect brown setae. Head, pronotum, scutellum, and elytra brown. Mouthparts, antennae and legs yellowish-brown, metafemora darkened, brown. Ventral surface brown.
FIGURE 57.
Exochomoscirtes nipponicus
sp. nov.
, male.
A)
sternite 9;
B)
tergite 8;
C)
tergite 9;
D)
tegmen;
E)
penis. Scale bar = 0.5 mm.
Head with distinct punctation, punctures separated by ca. 0.5–1.0 diameter. Eyes big, protuberant; head 1.9 X wider than interocular space. Antennae filiform. Antennomere 1 subcylindrical, antennomeres 2 and 3 of subequal lengths, antennomeres 4–11 slightly shorter than combined length of antennomeres 2 and 3. Palpomeres of maxillary palpi slightly widened.
Pronotum moderately convex, covered with distinct punctation, similar to that on head, separated by ca. 1.0–1.5 diameters, anterolateral corners obtuse, slightly projecting anteriorly; lateral margins subtly rounded; posterolateral corners somewhat acute; base of pronotum bisinuate, with complete margination along basal margin; PW/PL 2.8. Scutellum punctured as on pronotum, equilaterally triangular. Angle between pronotum and elytra not marked in dorsal outline.
Elytra oblong, with slightly explanate lateral margins, widest at the middle, punctation stronger than on pronotum, punctures deep, separated by ca. 1.0 diameter; humeri well marked; EL/EW 1.3; EL/PL 5.5; EW/ PW 1.5.
Legs moderately long. Hind tibial spurs well developed, dorsal one weakly curved, unmodified, as long as 3/4 length of tarsomere 1, and over twice as long as ventral one; ventral spur almost straight.
Ventrite 1 with sparse setation in mesal portion, and short longitudinal ridge, ventrite 2 with basal row of big punctures. Apex of tergite 7 unmodified. Apex of ventrite 5 subtly emarginated.
Sternite 9 (L 0.52,
W 0.43
) oval, consisting of two subrectangular hemisternites, with moderately long setae at apical margin. Tergite 8 (L 0.90,
W 0.47
) moderately sclerotized, long, apical portion subtrapezoidal, bearing row of setae on apical margin, apodemes long, diverging basally; tergite 9 (L 0.80,
W 0.43
) small, moderately sclerotized, with wide apical portion, without apical setae, with a pair of moderately long apodemes diverging basally, apodemes fused anteriorly. Tegmen (L 0.72,
W 0.45
) large, well sclerotized, parameres straight, widening and incurved apically, apices with two large denticles, mesal process very narrow, reaching 1/3 of the length of parameres. Penis (L 0.45,
W 0.14
) small, elongate oval, parameroids slightly shorter than pala.
Female.
Externally indistinguishable from male. Prehensor long (L 0.20), very narrow in distal portion, widened in proximal half, hooked in distal portion.
Variability.
TL/EW (same in males and females): 1.5–1.6 (1.5).
FIGURE 58.
Exochomoscirtes nipponicus
sp. nov.
, female, bursal sclerite and prehensor.
Measurements.
Males (n = 3): TL 4.20–4.75 (4.38), PL 0.65–0.80 (0.73), PW 1.83–2.15 (1.96), EL 3.60–
4.10 (3.82), EW 2.70–3.10 (2.88). Females (n = 4): TL 3.95–4.50 (4.23), PL 0.70–0.75 (0.71), PW 1.90–2.00
(1.94), EL 3.40–3.85 (3.65), EW 2.70–2.90 (2.83).
Distribution.
Japan
, Yaeyama Isl.
Etymology.
Specific epithet refers to the terra typica of the species (
Japan
).
Remarks.
Closely related to
E. nahangensis
(many similarities in morphology of genitalia).