Dendropaemon (D.) amazonicus 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) : 25-26

12. Dendropaemon (D.) amazonicus Génier & Arnaud , new species

( Figs. 12 , 56–57, 113, 157)

Type locality. Reserva Florestal Adolpho Ducke, 26 km NE Manaus, Amazonas, Brazil.

Diagnosis. The clypeal teeth lacking emargination laterally with the presence of metallic sheen on head pronotum and elytra and the finely punctate pronotal disc will separate D. amazonicus from all other species except from D. viridis from which it can be separated by its more convex body and angularly produced metasternum.

Description. Male holotype ( Fig. 12 ). Body. Body moderately large, length 13.0 mm, maximum width 7.5 mm; body subrectangular; dorsum slightly convex. Color. Dorsal surface dark brown to black, glossy, with greenish metallic sheen; head with green metallic sheen on genae and frons; pronotum with green metallic sheen except for an irregular transverse band on anterior half; elytra with uniform green metallic sheen; ventrum dark brown to black; pygidium with greenish metallic sheen; legs dark reddish brown to black. Head. Clypeus broadly arcuate, anterior portion upturned; clypeal teeth acutely triangular; clypeal median emargination v-shaped, clypeal edge lacking emargination on external side of each clypeal tooth, clypeal teeth ventral surface with a fine v-shaped carina, clypeal margin ill-defined, lacking sharp carina posteriorly, clypeal surface with short and blunt transverse rugulae; clypeogenal suture well-defined, bluntly carinate internally; genal surface with small and coarse rugulae anteriorly and simply punctate posteriorly, with a short and sharp transverse carina; clypeofrontal carina low, more than 6 times wider than high, straight in dorsal view, lacking carina or tubercle, clypeofrontal carina apical edge straight in frontal view; eyes moderately large in dorsal view, interocular ratio 3.9. Pronotum. Pronotum transverse in dorsal view, pronotal width/length ratio 1.6; disc of pronotum finely punctate on disc, with a fine longitudinal sulcus on posterior half; pronotal anterior margin only slightly wider and flat lateral to eye; anterior portion with a transverse sinuate bulge; anterior angles surface finely granulate, similar to lateral margin along posterior edge of anterior margin; lateral fossae simply rounded, concave; lateral portions strongly explanate; pronotal basal fossae well-defined, concave; posterior margin well-defined, lacking crenulation and setae. Elytra. Elytra approximately as long as wide in dorsal view, elytral combined width/length ratio 0.8; elytral base lacking distinct margin, simply convex; elytral striae 1–4 fine and well-defined, evenly impressed throughout, elytral striae 5 atrophied, lacking fine carina on each side on disc, strial punctures fine, not encroaching on interval, stria 1 well-defined apically, connecting to marginal stria; interstriae flat, minutely punctate throughout, surface glossy. Thoracic sterna. Proepisternal carina reduced, present along coxal insertion only; metasternal median lobe angularly produced anteromedially, ventral ridge well-defined, v-shaped. Legs. Profemur ventral surface slightly but distinctly convex and glabrous anteriorly, posterointernal margin rather thick, evenly developed, internal edge rather wide, with a brush of long setae along anterointernal edge, remaining surface finely punctate along setae. Protibia with four teeth on lateral edge; internal basal angle lobate; anterior surface with long aligned row of setae internally, surface glossy or feebly microsculptured between punctures; posterior surface with coarse irregular punctures externally to median carina, surface between punctures finely and irregularly microsculptured, with a single interrupted setal row along lateral teeth. Mesofemur angularly produced on anterointernal edge apically. Mesotibia robust, slightly widening toward apex in anterior view; anteroapical edge straight 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, 2-segmented, first segment moderately elongate, approximately two times as long as wide at apex. Metafemur subrectangular in anterior view, approximately twice as long as wide, 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, metatibial posterior surface flat between longitudinal row of setae and lateral edge, glossy between punctures. Metatarsus 2- segmented ( Fig. 113 ), first segment moderately elongate, approximately two times as long as wide at apex, with anterointernal carina ill-defined. Abdominal sternites. Sternites 3–6 longitudinally flat; sternites 4–6 with 1–3 unaligned rows of setae laterally, glabrous medially; sternite 7 approximately longitudinally flat medially, shorter than segment 6 along midline; pygidium finely punctate on disc. Male genitalia (Figs. 56–57). Parameres simply rounded apically in dorsal view; surface smooth, glossy apically.

Measurements (2 males, 1 female). Length: male 12.5–16.0 (14.3±2.5), female 13.0 mm.

Primary type data. Holotype male (BMNH): [ BRAZIL, Amazonas/ Reserva Ducke/ 26km NE of Manaus/ Flight Intercept Trap/ 1995–1996]; [BMNH(E)/ 2003-84]; [CF2 Abnl/ 25%] handwritten; [43 14] handwritten; [WORLD/ SCARAB./ DATABASE/ WSD00016696]; [HOLOTYPE / Dendropaemon / amazonicus n.sp. / Génier & Arnaud, 2014] red card.

Material examined. BRAZIL: AMAZONAS, Est. BR 17, Km 38, Manaus, 7.viii.1969, coll. [illegible]— 1 female allotype ( CMNC); Reserva Florestal Adolpho Ducke, 26 km NE Manaus, (2°57'S, 59°57'W), 1995–1996, coll. [anonymous]— 2 males (incl. holotype, 1 paratype) ( BMNH).

Etymology. Amazonicus , pertaining or belonging to the Amazon, the region where the three specimens known were collected.

Natural history. The holotype and a paratype were collected using flight intercept traps set in primary Amazonian rain forest (Reserva Ducke).

Remarks. Female differ from male by the anterior pronotal carina which is unmodified medially; the median carina is bluntly tuberculate medially, and depressed on each side of tubercle in male. Little variation observed aside the extent of the green metallic marking on pronotum. In one paratype the pronotum is entirely black and in the other the basal half of disc has green metallic reflections.

Figures

FIGURES 7 – 12. Dorsal habitus. 7. D. inflatus, female holotype; 8. D. pauliani, female holotype; 9. D. pilosissimus, female holotype; 10. D. renatii, female holotype; 11. D. aenigmaticus, male holotype; 12. D. amazonicus, male holotype.

FIGURES 110 – 117. Metatarsus, ventral view. 110. D. bluti; 111. D. carinifer; 112. D. aenigmaticus; 113. D. amazonicus; 114. D. angustulus; 115. D. viridis; 116. D. viridipennis; 117. D. convexus.