A taxonomic review of the Oriental Laccophilus javanicus species group (Coleoptera: Dytiscidae)
Author
Hájek, Jiří
Department of Entomology, National Museum, Cirkusová 1740, CZ- 193 00 Praha 9 – Horní Počernice, Czech Republic
jiri_hajek@nm.cz
Author
Brancucci, Michel
Naturhistorisches Museum, Basel, Switzerland
text
Raffles Bulletin of Zoology
2015
2015-08-06
63
309
326
journal article
55750
10.5281/zenodo.5385198
c7f95b94-53f8-420d-97c5-4e27d7c211bf
2345-7600
5385198
AC7F1491-CD89-4F10-9D61-55354B55E368
Laccophilus jaechi
,
new species
(
Figs. 7
,
24
)
Type
locality.
Thailand
,
Trat Province
,
Ko Chang Island
.
Material examined.
Holotype
male, labelled: O [eastern] –
THAILAND
1990 / Ko Chang [Island] (12) / White Sands Beach / leg.
Jäch
10.12. (
NHMW
)
.
Paratypes
:
1 male
,
2 females
: same label data as holotype (
NMPC
,
NHMW
)
;
1 male
:
Khao Sebap
/
THAILANDE
/
XI. 1981
/
Coll. T. Lander
(
NHMB
);
4 males
,
4 females
:
CAMBODIA
SW,
20kmSE
/
KOH KONG
:
Tatai riv.
/ 11°34′, N103°07′E /
3.-19.v.2005
,
50-
300 m
, /
E.Jendek
&
O.Šauša
leg. (
NHMB
,
NMPC
).
Diagnosis.
Medium sized, oval oblong species (body length
4.1–4.4 mm
). It is very similar to
L. tonkinensis
in habitus and elytral colouration, and to
L. hendrichi
and
L. javanicus
in general shape of penis. The new species differs from all three mentioned species by the distinct shape of the median lobe distal part, which is ventrally very weakly sinuate, apically with small inflexed point.
Laccophilus jaechi
differs from
L. hendrichi
and
L. javanicus
also in the constant very broad testaceous elytral subbasal band not separated from the elytral base.
Description.
Colouration: Head and pronotum testaceous, elytra brownish-black with testaceous pattern consisting of broad sinuous subbasal transverse band not separated from base of elytra, indistinct latero-medial spot, narrow preapical transverse band interrupted on suture, and a small indistinct apical spot (
Fig. 7
). Appendages and ventral part testaceous.
Surface structures and sculpture: Head reticulation simple, composed of large irregular polygonal meshes, which are moderately deeply impressed. Frons between eyes, and clypeus with several large punctures. Reticulation of pronotum same as that of head. Pronotum along fore and basal margins and in posterior angles with numerous large setigerous punctures. Reticulation of elytra simple, composed of large irregular polygonal meshes similar to that of head or pronotum, but slightly more impressed. Meshes mostly complete, inner space often with several (1–3) small punctures. Each elytron with indistinct, sutural, discal and lateral row of large serial setigerous punctures. Ventral part reticulated with fine elongated meshes. Prosternal apophysis lanceolate. Abdominal ventrites with numerous oblique grooves and several large setigerous punctures, lateral margin bordered. Apical ventrite rounded posteriorly, with large setigerous punctures and transverse grooves on disc. Male pro- and mesotarsomeres 1–3 weakly dilated with bundle of adhesive setae on ventral side. Claws of pro- and mesotarsi simple and equal.
Male genitalia: Median lobe of aedeagus in lateral view as in
Fig. 24
.
Female genitalia: Similar to male; pro- and mesotarsomeres not dilated.
Variability.
Specimens of the
type
series vary in extent of elytral colour pattern, especially of the subbasal testaceous band, the major part of which is separated in some specimens from the elytral base.
Measurements (N= 13). Body length
4.1–4.4 mm
(mean value =
4.3 mm
,
holotype
4.1 mm
); width
2.3–2.5 mm
(mean value =
2.4 mm
,
holotype
2.3 mm
).
Etymology.
The new species is dedicated to its collector, our colleague Manfred A. Jäch (NHMW), a specialist on
Hydraenidae
and Dryopoidea.
Distribution.
So far known only from a small area of southeastern
Thailand
and south-western
Cambodia
(
Fig. 40
).