Revision of the genus Cephalobyrrhus of Japan and Taiwan (Coleoptera, Limnichidae)
Author
Yoshitomi, Hiroyuki
text
ZooKeys
2019
817
61
72
http://dx.doi.org/10.3897/zookeys.817.31530
journal article
http://dx.doi.org/10.3897/zookeys.817.31530
1313-2970-817-61
9EF0E612F6554FFD95A0130B0D64A757
Cephalobyrrhus Pic, 1923
Cephalobyrrhus
:
Pic 1923
: 4.
Champion 1925
: 174;
Wooldridge 1977
: 29;
1984
: 121;
Puetz
1998
: 342.
Type species.
Cephalobyrrhus latus
Pic, 1923: 4
Diagnosis.
Body medium size in the family, ca 2.2-4.5 mm, oblong, weakly convex dorsally, closely covered with short setae in dorsal surface. Eyes large; distance be
tween
their inner margins approximately equal to the diameter of one eye. Mandibles (Fig. 2B) slender, with pointed tridentate apex. Maxillae (Fig. 2C) rounded in apical part of galea and lacinia, with 4-segmented palpi. Labial palpi (Fig. 2D) 3-segmented, with rhomboid terminal palpomere. Pronotum bisinuate in posterior margin, gently tapering anteriorly. Hind wings (Fig. 2A) fully developed, 2.5 times as long as wide; AA3+4 present; MP3 and MP4 not connected with AA3+4. Elytra elongate, bisinuate in basal margin, with obvious irregular zigzag markings consisting of adpressed long silver setae. Metacoxae transverse. Legs relatively long; hind tibiae exteriorly smooth; tarsal formula 5-5-5. Sexual dimorphism indistinct.
Figure 1. Dorsal (
A-C
) and lateral (D) habitus of
Cephalobyrrhus
spp. from Japan and Taiwan. A
Cephalobyrrhus latus
Pic, 1923 B
C. japonicus
Champion, 1925 C, D
C. amami
sp. n. (holotype). Scale bar: 1.0 mm.
Figure 2. Hind wing (A), mandible (B), maxilla (C), labial palpus (D), and male antennae (
E-G
) of
Cephalobyrrhus
spp.
A-D
, F
C. japonicus
Champion, 1925 E
C. latus
Pic, 1923 G
C. amami
sp. n. (paratype).
Remarks.
This genus is similar to
Erichia
Reitter, 1895 (=
Jaechobyrrhinus
Puetz
, 1991), in general appearance, but differs from the latter in the following characteristics (
Puetz
1991
): body oblong, gently tapering posteriorly (elongate and subparallel-sided in
Erichia
); pronotum rounded in anterior and posterior corners (pointed in
Erichia
), posterior margin bisinuate (with two rounded extensions in
Erichia
). Most species of this genus have similar external features and intraspecific variation, and cannot be reliably identified without examination of the male genitalia (
Puetz
1998
).
Key to males of the species of the genus
Cephalobyrrhus
of Japan and Taiwan
|
C. amami
sp. n.
|
| 2 |
|
C. latus
|
|
C. japonicus
|