Genus Microsternus Lewis (1887) from China, with description of a new genus Neosternus from Asia (Coleoptera, Erotylidae, Dacnini)
Author
Dai, Cong-Chao
Author
Zhao, Mei-Jun
text
ZooKeys
2013
340
79
106
http://dx.doi.org/10.3897/zookeys.340.6044
journal article
http://dx.doi.org/10.3897/zookeys.340.6044
1313-2970-340-79
Genus
Neosternus Dai & Zhao
gen. n.
Figs 34-37, 38-39, 43-44, 48-49, 53-54, 55-58, 65-68, 69-72, 76
Type species.
Microsternus higonius
Lewis, 1887, here designated.
Description.
Body small, elongate oval (Figs 34-37, 76), with legs short and robust, the tarsi cylindrical, 5-jointed, the four basal joints short, nearly equal in size and not at all dilated, the last joint long. Antennae not very long, the latter with a broad 3-jointed club. Eyes coarsely facetted. Maxillary and labial terminal palpomeres (Figs 43, 44) acuminate, sensory area restricted to apex. Pronotum (Figs 48, 49) arched, widest at base; narrowed from base to apex, with a deep sulcus along each side, which is broadly margined and the bordering gradually widened anteriorly, which formed thicken lines in lateral view (Figs 53, 54); disk coarsely and sparsely punctured, except the impunctate medio-basal area, which is limited by an arched transverse row of coarse punctures. Prosternum (Figs 38, 39) with median area including its process elevated in an elongate triangular plane, which is distinctly bordered by a ridge on both sides and shortly rounded-subtruncate in front. Mesosternum almost concealed by prosternal process. Metasternum with a pair of mesocoxal lines strongly divergent posteriorly. Abdomen without metacoxal lines on basal visible sternite. Elytra strongly convex.
Figures 34-37. Habitus of
Neosternus higonius
in dorsal and ventral view 34-35 Habitus of
Neosternus hisamatsui
in dorsal and ventral view 36-37. Scale = 1 mm.
Figures 38-39. Prosternum of
Neosternus higonius
38 Prosternum of
Neosternus hisamatsui
39.
Figures 40-44. Mouth part of
Microsternus ulkei
40 Mouth part of
Microsternus tricolor
41 Mouth part of
Microsternus perforatus
42 Mouth part of
Neosternus higonius
43 Mouth part of
Neosternus hisamatsui
44.
Figures 45-49. Pronotum of
Microsternus ulkei
in dorsal view 45 Pronotum of
Microsternus tricolor
in dorsal view 46 Pronotum of
Microsternus perforatus
in dorsal view 47 Pronotum of
Neosternus higonius
in dorsal view 48 Pronotum of
Neosternus hisamatsui
in dorsal view 49.
Figures 50-54. Pronotum of
Microsternus ulkei
in lateral view 50 Pronotum of
Microsternus tricolor
in lateral view 51 Pronotum of
Microsternus perforatus
in lateral view 52 Pronotum of
Neosternus higonius
in lateral view 53 Pronotum of
Neosternus hisamatsui
in lateral view 54.
Figures 55-64. Flagellum of
Neosternus higonius
in lateral view 55 Flagellum of
Neosternus higonius
in dorsal view 56 Flagellum of
Neosternus hisamatsui
in lateral view 57 Flagellum of
Neosternus hisamatsui
in dorsal view 58 Flagellum of
Microsternus ulkei
in lateral view 59 Flagellum of
Microsternus ulkei
in dorsal view 60 Flagellum of
Microsternus tricolor
in lateral view 61 Flagellum of
Microsternus tricolor
in dorsal view 62 Flagellum of
Microsternus perforatus
in lateral view 63 Flagellum of
Microsternus perforatus
in dorsal view 64. Scale=0.1mm (55-56), Scale=0.2mm (57-64).
Figures 65-68. Male genitalia of
Neosternus higonius
in lateral view 65 Internal sac of
Neosternus higonius
in lateral view 66 Dorsal lobe of
Neosternus higonius
in dorsal view 6, Ventral lobe of
Neosternus higonius
in dorsal view 68. Scale=0.5mm (65), Scale=0.2mm (66, 67), Scale=0.05mm (68).
Figures 69-72. Male genitalia of
Neosternus hisamatsui
in lateral view 69 Dorsal lobe of
Neosternus hisamatsui
in dorsal view 70 Female genitalia of
Neosternus hisamatsui
in dorsal view 71 Female spermatheca of
Neosternus hisamatsui
72. Scale=1mm (72), Scale=0.3mm (69), Scale=0.2mm (70), Scale=0.1mm (71).
Figures 73-75. Habitat and adult feeding fungues of
Microsternus tricolor
73 Habitat and adult feeding fungues of
Microsternus perforatus
74-75.
Figures 76-78. Type material of
Neosternus higonius
76 Type material of
Microsternus tricolor
77 Type material of
Microsternus perforatus
78. (NHM).
Distribution.
China, Japan.
Diagnosis.
This new genus can be distinguished from
Microsternus
by body elongate oval, head without the pit posterior to the postmandibular lobes, pronotum with a deep sulcus along each side, which is broadly margined in lateral view, male genitalia with flagellum bearing a arched mass on apical quarter (Figs 55-58).
Microsternus
body elongate, head with the pit posterior to the postmandibular lobes, pronotum without a deep sulcus along each side and narrowly margined in lateral view, male genitalia with flagellum bearing a straight mass on apical quarter (Figs 59-64).
Etymology
.
As a uniquely new group within
Dacnini
, the generic name is derived from
Microsternus
, it is appropriate to call the genus "New sternus", and to abbreviate and combine the roots into a single word. The gender is masculine.
Key to species of genus
Neosternus
|
Neosternushisamatsui
|
|
Neosternushigonius
|
|
Neosternustaiwanus
|