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 nahangensis
sp. nov.
(
Figs. 14E
,
59
,
60
)
Type material.
Holotype
, male (
NMW
):
“N
VIETNAM
: 26.–
30.5.1996
/
160 km
NNW
Hanoi
,
150–200m
/ NE env. of Na Hang / leg.
Napolov
& Roma” [printed label]
.
Paratypes
.
2 males
(
NMW
):
same data as holotype
.
Diagnosis.
Exochomoscirtes nahangensis
sp. nov.
is distincly smaller than
E. nipponicus
sp. nov.
The species is similar to
E. meghalayensis
sp. nov.
and
E. arunachalensis
sp. nov.
, but the body is lighter brown, the apical process of the tegmen is half as long as tegmen, and the parameres are apically widened, and have bidentate apices.
Description.
Holotype
, male. Body elongate oval, TL/EW 1.4, slightly flattened, covered with erect brownish setae. Head, pronotum, scutellum, and elytra brown. Mouthparts, antennae and legs yellowish, metafemora darkened, brown; antennae subtly darkening apically. Ventral surface brown.
Head with distinct punctation, punctures separated by ca. 1.0 diameter. Eyes big, protuberant; head 2.0 X wider than interocular space. Antennae filiform. Antennomere 1 subcylindrical, antennomeres 2 and 3 of subequal lengths, antennomeres 4–11 slightly shorter than antennomeres 2 and 3 combined. Palpomeres of maxillary palpi slightly widened.
Pronotum moderately convex, covered with distinct punctation, similar to that on head, separated by ca. 1.0 diameter, anterolateral corners obtuse, slightly projecting anteriorly; lateral margins subtly rounded; posterolateral corners acute; base of pronotum bisinuate, with complete margination along basal margin; PW/PL 2.9. Scutellum punctured as on pronotum, equilaterally triangular. Angle between pronotum and elytra not marked in dorsal outline.
FIGURE 59.
Exochomoscirtes nahangensis
sp. nov.
, male.
A)
sternite 9;
B)
tergite 8;
C)
tergite 9;
D)
tegmen;
E)
penis. Scale bar = 0.5 mm.
FIGURE 60.
Exochomoscirtes nahangensis
sp. nov.
, female.
A)
bursal sclerite and prehensor;
B)
apex of prehensor;
C)
detail of membranous duct.
Elytra oblong, with slightly explanate lateral margins, widest in basal 1/3, punctation stronger than on pronotum, punctures deep, separated by ca. 1.0 diameter; humeri well marked; EL/EW 1.2; EL/PL 5.1; EW/ PW 1.4.
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 weakly curved.
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 0.47,
W 0.33
) elongated, consisting of two subrectangular hemisternites, with moderately long setae at apical margin, which are dense in mesal portion. Tergite 8 (L 0.62,
W 0.45
) moderately sclerotized, apical portion subtrapezoidal, bearing indistinct setae on apical margin, apodemes moderately long, diverging basally; tergite 9 (0.29,
W 0.48
) small, moderately sclerotized, with wide apical portion and minute setae at apex, with a pair of short apodemes strongly diverging basally, apodemes fused anteriorly. Tegmen (L 0.55,
W 0.40
) large, well sclerotized, parameres straight, widening and incurved apically, apices with large denticles, mesal process very narrow, widened at apex, reaching half of the length of parameres. Penis (L 0.23,
W 0.12
) small, elongate oval, parameroids indistinct.
Female unknown.
Variability.
TL/EW 1.3–1.4 (1.4)
Measurements.
Males (n = 3): TL 3.10–3.45 (3.29), PL 0.53–0.65 (0.58), PW 1.55–1.75 (1.65), EL 2.68– 3.14 (2.84), EW 2.23–2.58 (2.42).
Distribution.
N
Vietnam
.
Etymology.
Locotypically, after Na Hang in N
Vietnam
.