Dendropaemon (Sulcopaemon) latistriatus Génier & Arnaud, 2016

François Génier & Patrick Arnaud, 2016, Dendropaemon Perty, 1830: taxonomy, systematics and phylogeny of the morphologically most derived phanaeine genus (Coleoptera: Scarabaeidae, Scarabaeinae, Phanaeini), Zootaxa 4099 (1) : 73-75

37. Dendropaemon (Sulcopaemon) latistriatus Génier & Arnaud , new species

( Figs. 37 , 100–101, 161)

Type locality. Cororó, Concepción, Paraguay.

Diagnosis. Differs from all other species in the genus by its evenly wide and deeply impressed elytral striae on disc combined with the elytral striae 6 and 7 being atrophied and largely reduced to an irregular row of punctures.

Description. Male holotype ( Fig. 37 ). Body. Body small, length 9.5 mm, maximum width 4.0 mm; body subrectangular in dorsal view; dorsum narrowly flat. Color. Dorsal surface dark brown to black, glossy, with green metallic sheen; head black along anterior edge of clypeus, metallic green on remaining surface; pronotum with green metallic sheen except on small areas along anteromedian carina and adjacent to lateral fossae; elytra with uniform green metallic sheen; ventrum black; pygidium with green metallic sheen; legs black. Head. Clypeus broadly arcuate, anterior portion slightly upturned; clypeal teeth acutely triangular; clypeal median emargination broadly u-shaped, clypeal edge emarginate on external side of each clypeal tooth, clypeal teeth ventral surface lacking carina, clypeal margin well-defined and sharply carinate posteriorly, clypeal surface with transverse blunt rugulae; clypeogenal suture well-defined, bluntly carinate internally; genal surface with fine sharp tubercle and rugulae on disc, lacking distinct transverse carina, simply convex; clypeofrontal carina low, more than 6 times wider than high, straight in dorsal view, simply carinate, clypeofrontal carina apical edge broadly arcuate in frontal view; eyes small in dorsal view, interocular ratio 5.9. Pronotum. Pronotum transverse in dorsal view, pronotal width/length ratio 1.4; disc of pronotum minutely punctate throughout, with a fine longitudinal sulcus on posterior two-third; pronotal anterior margin wider and flat lateral to eyes; anterior portion with a tri-sinuous carina, carina produced into a tubercle medially; anterior angles surface with fine blunt longitudinal rugulae, similar to lateral margin along posterior edge of anterior margin; lateral fossae simply rounded, concave; lateral portions unmodified; pronotal basal fossae very small and more or less rounded; posterior margin ill-defined on a short distance on each side of pronotal basal fossae, lacking setae. Elytra. Elytra approximately as long as wide in dorsal view, elytral combined width/length ratio 0.9; elytral base lacking distinct margin, simply convex; elytral striae 1– 4 very wide on disc, abruptly tapering on apical declivity, very deeply impressed from base to apical declivity, elytral striae 5 atrophied, lacking fine carina on each side on disc, strial punctures minute, stria 1 weakly impressed apically, going straight to elytral apical margin; interstriae slightly convex, minutely punctate throughout, surface glossy. Thoracic sterna. Proepisternal carina absent; metasternal median lobe bluntly angularly produced anteromedially, ventral ridge well-defined, keel-shaped. Legs. Profemur posterior surface flat and glabrous internally, posterointernal margin rather thick, evenly developed, internal edge rather wide, with a contiguous row of setae along anterointernal edge, remaining surface more or less irregularly punctate. Protibia with four teeth on lateral edge; internal basal angle lobate; anterior surface lacking aligned row of setae internally, surface coarsely microsculptured between punctures; posterior surface with irregular rugose punctures externally to median carina, surface glossy between punctures, with a single interrupted setal row along lateral teeth. Mesofemur obtusely angular on anterointernal edge apically. Mesotibia rather short, gradually widening toward apex in anterior view; anteroapical edge slightly sinuate in anterior view, anteroapical row of setae complete; apicoanterior edge circularly indented internally; external edge more or less rounded, with several large elongate setiferous punctures. Mesotarsus similar in shape to metatarsus, 3-segmented, first segment moderately elongate, approximately two times as long as wide at apex. Metafemur internal edge nearly straight and lateral edge arcuate, lacking distinct depressed area anterointernally before apex, apicoposterior edge unmodified, anterior surface with a well-defined sulcus on apical half. Metatibia moderately slender, slightly widening toward apex in anterior view, anterior surface with distinct row of setae, surface glossy basally and slightly irregular apically, metatibial posterior surface flat between longitudinal row of setae and lateral edge, with transverse microsculpture. Metatarsus 3-segmented, first segment moderately elongate, approximately two times as long as wide at apex, with anterointernal carina well defined and almost reaching apical edge. Abdominal sternites. Sternites 3–6 longitudinally slightly convex, segment 6 slightly concave; sternites 4–6 with 1–3 unaligned rows of setae laterally, glabrous medially; sternite 7 deeply longitudinally concave medially, shorter than segment 6 along midline; pygidium minutely punctate on disc. Male genitalia (Figs. 100–101). Parameres produced onto a lobe laterally; surface smooth, glossy apically.

Measurements (1 male, 1 female). Length: male 9.5, female 8.5 mm.

Primary type data. Holotype male (CMNC): [ PARAGUAY: CONCEPCIÓN/ Cororó/ 15.XII.1995 / Colr.: C. Aguilar J.]; [WORLD/ SCARAB./ DATABASE/ WSD00017480]; [HOLOTYPE / Dendropaemon / latistriatus n.sp. / Génier & Arnaud, 2014] red card.

Material examined. PARAGUAY: CONCEPCIÓN, Cororó, (23°24'14.76''S, 56°30'47.52''W), 8.xi.1992, coll. C. Aguilar J.— 1 female (paratype) ( WDEC); same locality, 15.xii.1995, coll. C. Aguilar J.— 1 male (holotype) ( WDEC).

Etymology. Latistriatus , latus+striatus, a Latin adjective referring to the configuration of the elytral striae.

Natural history. Unknown.

Remarks. The female differs in having the clypeogenal carina very low, the pronotal anteromedian carina slightly tuberculate medially and the abdominal sternite 7 flat. Interestingly, in this species the abdominal sternite 8 is only slightly longitudinally reduced medially as opposed to other Dendropaemon species.

Variation is restricted to the extent of metallic sheen on head and pronotum and the uniform green metallic sheen of elytra in the second specimen known.

The holotype male is missing the antennae, mouth parts and both metatarsus suggesting that it was found dead and might have been partly dismantled by ants. The description of the metatarsus is based on the female specimen.

Figures

FIGURES 37 – 41. Dorsal habitus. 37. D. latistriatus, male holotype; 38. D. nitidicollis, male lectotype; 39. D. quadratus, male neotype; 40. D. similis, male holotype; 41. D. denticollis, female holotype.