Review of the Madagascan Orphninae (Coleoptera: Scarabaeidae) with a revision of the genus Triodontus Westwood
Author
Frolov, Andrey V.
Author
Montreuil, Olivier
Author
Akhmetova, Lilia A.
text
Zootaxa
2016
4207
1
1
93
journal article
37549
10.11646/zootaxa.4207.1.1
cef35771-ff95-4a41-9af6-196dea899a64
1175-5326
200444
F2875582-31E2-496F-AEEF-1D657DD86C33
Madecorphnus hanskii
Frolov, 2012
(
Figs. 23
A–F)
Madecorphnus hanskii
Frolov, 2012b
: 160
.
Type
material examined.
Holotype
(
Figs. 23
A–E), male, “
Madagascar
Ambohitantely [
18°10' S
,
47°17' E
]
24.3.2005
, wet forest,
I. Hanski-group
leg. /
Holotypus
Madec.
hanskii
Frolov 2009
” (
ZIN
)
.
Diagnosis.
Madecorphnus hanskii
is similar to
M. falciger
and
M. punctatus
in having internal sac of the aedeagus with 3 sclerites: 1 relatively long, spur-like, and 2 comma-shaped or somewhat bifurcate (
Figs. 16
E–F, 22D–E, 23D–E). It can be separated from these species by the shape and relative size of these sclerites and, from the latter, by the shape of parameres and sparse punctation of head and pronotum.
Description. Male.
Body length
5.3 mm
. Color uniformly brown (
Fig. 23
A).
Right mandible as long as left, without tooth behind apex. Labrum trapezoidal, with broadly rounded sides, length about 1/6 width (in dorsal view). Frontoclypeus slightly asymmetrical, apically obtuse, with 2 long and 6 shorter setae on the apical margin. Canthus and frontoclypeus almost flat, minutely depressed apicomedially. Head without traces of frontoclypeal suture, finely punctate with minute punctures separated by greater than 5 times their diameter.
Pronotum approximately 1.6 times wider than long, widest medially. Disc of pronotum convex, without any depressions, tubercles, or ridges. Punctation on pronotum similar to that on head. Margins with relatively wide border, lateral margins with 4 long setae: 1 seta on basal angle, 1 seta approximately in the middle of lateral margin, and 2 setae on the apical angle.
Scutellum triangular, right angled apically, about 1/13 length of elytra.
Elytra convex, with distinct humeral humps, widest at basal third, glabrous. First stria distinct and reaching the apex of elytron, other striae indistinct. Disc of elytra with a few relatively large punctures. Epipleura with long, sparse, brown setae. Base of elytron with border. Wings fully developed.
Protibiae with 3 outer teeth, lateral margin basad of outer teeth not crenulate. Protibial apex with robust, spurlike seta and 2 smaller setae basally. Mesothoracic and metathoracic legs similar in shape to each other, metathoracic legs somewhat longer. Longer tibial spur shorter than 2 basal tarsomeres in mesothoracic legs and longer than 2 basal tarsomeres in metathoracic legs.
FIGURE 23.
Madecorphnus hanskii
, holotype. Habitus in dorsal view (A), aedeagus in lateral view and parameres in dorsal view (B), labels (C), internal sac of aedeagus (D—photograph, E—schematic representation of armature), distributional records (F).
Parameres with teeth laterally, narrowly rounded apically in dorsal view and curved downwards in lateral view (
Fig. 23
B). Internal sac with a long, spur-like sclerite and 2 smaller, somewhat comma-shaped sclerites (
Figs. 23
D– E).
Female.
Unknown.
Distribution and habitat.
The
type
specimen of
M. hanskii
was collected in wet forest in Ambohitantely special reserve (
Fig. 23
F). The reserve is situated at altitudes of about
1500 m
and houses the last remnants of indigenous forest on the central plateau of
Madagascar
.
Madecorphnus hanskii
is apparently a forest litter dweller and, due to severe deforestation of the central plateau, its current range may be limited to this small forest remnant.