Orthogonius punctum, Tian & Deuve, 2016

Tian, Mingyi & Deuve, Thierry, 2016, Stepwise and cooperative assembly of a cytokinetic core complex in budding yeast Saccharomyces cerevisiae, Belgian Journal of Entomology 42, pp. 1-19 : 1-19

Orthogonius punctum sp. nov.

Figs 4–9

ETYMOLOGY. Refers the punctate head of the new species.

DIAGNOSIS. Similar to O. deletus Schmidt-Göbel, 1846 , but O. punctum sp. nov. is easily recognized by its broad hind angle of pronotum and stouter aedeagus.

TYPE MATERIAL. Holotype ♂: [Coll. I.R.Sc.N.B. / Vietnam: Dong Nai Biosphere Res.; 11°18’N, 107°06’E / 25.VI.-6.VII.2012, night collecting/ Leg. J. Constant & J. Bresseel /I.G. 32.161] ( RBINS).

Paratypes: 17♂, 17♀: idem, all in IRSNB ; 3♂, 3♀: ibid ( MNHN) ; 3♂, 3♀: ibid ( SCAU) ; 1♂: [S. Thailand, Phang-nga Prov. Takuapa Distr. , vic. Khao Lak, 40-80 m, 03-16.VII.2012, 08°37’N / 98°15’E, leg. A. Weigel] ( ENHM) ; 1♂, same data as above, but [5 km S. Khao Lak, 10-50 m, 03-16.VII.2012, 08°37’N / 98°15’E] ( MNHN) ; 1♀: ibid ( ENHM) ; 1♂, [ Vietnam: Laichun Prov. , Banpobai, EL:102.60, NL 22.00, 6-12.VI.2009, local collector”] ( CIB) ; 1♂, ibid ( MNHN) .

DESCRIPTION

Length: 14.0–18.0 mm; width: 4.5–5.5 mm. Habitus as in Figs4–5 . Body elongate, strongly shiny, smooth and glabrous; brownish to light dark brown, head and disc of pronotum darker, elytra lighter; almost black for the two specimens from southern Thailand; macrosculpture: head moderately punctate, pronotum impunctate, elytra with a few finely and sparse punctures on odd intervals only; microsculptural meshes isodiametric on elytra and neck, unclear on frons and moderately transverse on pronotum.

Head: moderately broad, slightly longer than wide, HL/HW=1.1–1.2; eyes rather small but prominent; frons and vertex moderately convex; frontal impressions narrow but deep, extending beyond the level of anterior supraorbital pores; clypeus bisetose, basal portion with three short furrows along sides and on the median, linking frontoclypeal suture and frontal impressions; labrum six setose, shallowly but widely emarginate at apical margin; palpi slender, subcylindrical, 3 rd maxillary palpomere as long as 4 th which is glabrous, 3 rd with several short setae at apex; 2 nd labial palpomere slightly longer than 3 rd, bisetose on inner margin, with several additional setae at subapex and apex, 3 rd with a few short setae; ligula small, slightly dilated at apex, bisetose; mentum edentate; both mentum and submentum bisetose; palpigers setose; antennae quite short and stout, extending to base of elytra; pubescent from basal third of 4 thantennomere, slightly expanded at pubescent portion; 3 rd antennomere slightly longer than 4 th but slightly shorter than 1 st.

Pronotum: strongly transverse, PW/PL=1.6–1.7, with disc moderately convex; fore (except for median portion) and basal margins well beaded, sides evenly expanded, widest at mid-length; base slightly wider than front, bisinuate, making median part of posterior margin more or less protruded backwards; anterior margin nearly straight; fore angle rounded off, hind one obtusely broad; lateral expanded margin well defined, narrow, slightly reflexed; both transversal impressions more or less distinct; basal foveae small and deep.

Elytra: elongate, moderately convex; EL/EW=1.6–1.7; widest at about middle, nearly parallel-sided at mid-length; basal border complete; apex bisinuate, reversely and shortly concave before tip which is evidently denticulate; striae rather shallow, punctate-striate, with intervals slightly convex, subequal in width to each other in middle portion; 3 rd interval with three setiferous pores, normally sited (basal one close to 3 rd stria and other two to 2 nd stria); 7 th interval simple.

Legs: rather stout; fore tibiae strongly expanded at apex, with outer angle strongly protruded and outer margin serrate; hind femora moderately expanded, with 5 posterior setae; middle coxae with two setae medially; hind coxae smooth and glabrous; middle tibiae quite short, slightly curved, not dilated medially in male, enlarged at apex with outer margin with two rows of setae, distinctly serrate; hind tibiae slender, suddenly dilated at apex; apical spurs very short, flat and broad, more or less ear-shaped; fore tarsi distinctly wider than mid- and hind ones; 1 st hind tarsomere as long as 2 nd, 3 rd slightly shorter than 4 th which is symmetrically bilobed at apex; all tarsal claws moderately pectinated.

Ventral side: prosternal process bordered at apex; ventrite VII complete in male, with two pairs of setae on either side of apical margin in both sexes.

Male genitalia ( Figs 6–9 ): stout, dorsal opening wide and long, dilated in middle portion; ventral margin nearly straight; apex blunt in profile; apical lamella short, triangular, slightly longer than wide, with apex broad.

DISTRIBUTION. Southern Vietnam and southern Thailand.

Figures

Figs 4–5. Habitus of Orthogonius punctum sp. nov. 4. paratype, male, from NongNai, S. Vietnam; 5. paratype, male, from Khao Lak, S. Thailand.

Figs 6–9. Adeagus of Orthogonius punctum sp. nov., lateral view and dorsal view for apical lamella. 6–7. paratype, from NongNai, S. Vietnam; 8–9. paratype, male, from Khao Lak, S. Thailand.