Dendropaemon (Streblopaemon) fractipes Felsche, 1909

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) : 68-69

34. Dendropaemon (Streblopaemon) fractipes Felsche, 1909

( Figs. 34 , 94–95, 129, 149, 160)

Dendropemon fractipes Felsche 1909 , Deut. Ent. Zeit. 1909: 756 (original description) Dendropemon fractipes: Gillet 1911 , Col. Cat. 38: 88 (catalogue)

Dendropaemon fractipes: Olsoufieff 1924 , Insecta 13: 126 (monograph)

Dendropaemon fractipes: Pessôa & Lane 1936 , Rev. Biol. Hygiene 7: 90 (identification key, comment) Dendropaemon fractipes: Blut 1939 , Arch. Naturg. (N.F.) 8: 270 (monograph)

Dendropaemon fractipes: Pessôa & Lane 1941 , Arq. Zool. S. Paulo 2: 490 (identification key, comment) Dendropemon fractipes: Blackwelder 1944 , U.S. Nat . Mus. Bull. 185: 210 (checklist) Dendropemon (D.) fractipes: Edmonds 1972 , Univ. Kansas Sc. Bull. 49: 850 (comment taxonomy) Dendropaemon fractipes : Vaz-de-Mello 2000, Hac. Proy. CYTED: 192 (faunistic)

Dendropaemon (D.) fractipes: Arnaud 2002 , Col. Monde 28: 15 (mention)

Type locality. Demerara.

Diagnosis. The anteroposteriorly compressed mesotibia of D. fractipes is unique in the genus.

Description. Female holotype ( Fig. 34 ). Body. Body large, length 19.0 mm, maximum width 9.0 mm; body subrectangular in dorsal view; dorsum largely flat. Color. Dorsal surface black, glossy, lacking metallic sheen; ventrum black; pygidium black; legs black. Head. Clypeus broadly arcuate, anterior portion slightly upturned; clypeal teeth triangular; clypeal median emargination broadly v-shaped, clypeal edge emarginate on external side of each clypeal tooth, clypeal teeth ventral surface with a well-defined semicircular carina, clypeal margin illdefined, bordered posteriorly by a more or less regular row of punctures, clypeal surface with transverse blunt rugulae anteriorly and small rough irregular tubercles posteriorly; clypeogenal suture well-defined, bluntly carinate internally; genal surface with small irregular tubercles, transversely tumescent; clypeofrontal carina rather low, approximately 4 times wider than high, straight in dorsal view, simply carinate, clypeofrontal carina apical edge slightly emarginate medially in frontal view; eyes very small in dorsal view, interocular ratio 6.5. Pronotum. Pronotum transverse in dorsal view, pronotal width/length ratio 1.6; disc of pronotum minutely punctate, puncture slightly larger and denser anteriorly and laterally, with a fine ill-defined longitudinal sulcus on posterior two-third; pronotal anterior margin unmodified lateral to eye; anterior portion with a fine transverse carina bluntly and transversally tuberculate medially; anterior angles surface finely granulate, similar to lateral margin along posterior edge of anterior margin; lateral fossae simply rounded, concave; lateral portions slightly emarginate medially in dorsal view; pronotal basal fossae ill-defined, slightly concave; 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 1.1; elytral base lacking distinct margin, simply convex; elytral striae 1–4 fine and well-defined, evenly impressed throughout, elytral striae 5 similar to 4 on disc, strial punctures minute, stria 1 weakly impressed apically, going straight to elytral apical margin; interstriae flat, minutely punctate throughout, surface glossy. Thoracic sterna. Proepisternal carina well-defined, extending laterally; metasternal median lobe angularly produced anteromedially, ventral ridge absent. Legs. Profemur posterior surface slightly but distinctly convex, rather coarsely punctate and glabrous internally, posterointernal margin rather thin, uneven, internal edge rather wide, with a contiguous row of setae along anterointernal edge and few scattered long setae on anterior half, remaining surface with irregular punctures and glossy. Protibia with four teeth on lateral edge; internal basal angle lobate; anterior surface with reduced aligned row of setae internally, surface glossy or feebly microsculptured between punctures; posterior surface with coarse irregular punctures externally to median carina, surface glossy between punctures, with a single interrupted setal row along lateral teeth. Mesofemur unmodified on anterointernal edge apically. Mesotibia internal edge lobate medially, anterior surface compressed medially along lateral edge; anteroapical edge slightly sinuate in anterior view, anteroapical row of setae complete; apicoanterior edge circularly indented internally; external edge more or less flat, with irregular setiferous punctures and microsculpture. Mesotarsus similar in shape to metatarsus, 3-segmented, first segment moderately elongate, approximately two times as long as wide at apex. Metafemur elongate, internal and lateral edges mostly parallel in ventral view, more than twice as long as wide, lacking distinct depressed area anterointernally before apex, apicoposterior edge unmodified, anterior surface with an irregular fine sulcus medially. Metatibia rather slender, gradually widening toward apex in anterior view, anterior surface completely covered with irregular sculpturing and punctures, metatibial posterior surface irregular between longitudinal row of setae and lateral edge, with transverse microsculpture. Metatarsus 3-segmented ( Fig. 129 ), first segment elongate, more than three time 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 with mixed minute and fine punctures on disc.

Measurements (5 males, 8 females). Length: male 15.0–20.0 (17.8±1.9), female 17.0–19.5 (18.3±0.8) mm.

Primary type data ( Fig. 149 ). Holotype female (MTD): [ Demerara] handwritten; [Coll. C. Felsche/ Kauf 20, 1918] green card; [Staatl. Museum für/ Tierkunde Dresde]; [Types] red card; [ fractipes / m./ Surinam] handwritten; [WORLD/ SCARAB./ DATABASE/ WSD00002077]; [HOLOTYPE / Dendrop[a]emon / fractipes / Felsche, 1909] red card; [ Dendropaemon / fractipes / Felsche, 1909 / vid. Génier & Arnaud, 2009]

Material examined. ARGENTINA: MISIONES, San Ignacio, (27°16'S, 55°32'W), iv.1948, coll. [anonymous]— 1 female ( WDEC); BRAZIL: [unspecified locality], [no date], coll. [anonymous]— 1 female, 1 male ( BMNH, ZMHB); DISTRITO FEDERAL, Brasilia, (15°47'S, 47°55'W), 19.xi.2000, coll. N. Dégallier— 1 male ( CPFA); ESPIRITO SANTO, Jabaquara, (20°42'S, 40°40'W), 21.xii.1933, coll. [anonymous]— 1 female ( CMNC); SÃO PAULO, São José dos Campos, (23°11'S, 45°52'W), 14–17.x.1960, coll. D.L. Tiemann— 1 male ( WDEC); same locality, 2.i.1963, coll. D. Tiemann— 1 male ( WDEC); GUYANA: DEMERARA-MAHAICA, Demerara, (6°48'N, 58°10'W), [no date], coll. [anonymous]— 1 female (holotype) ( MTD); [NO DATA]: -., coll. [anonymous]— 4 females, 1 male ( BMNH, CPFA, MNHN).

Natural history. Unknown. The mesotibial configuration, which is very similar to other myrmecophilous beetles suggest that D. fractipes is also an inquiline.

Remarks. Males differ in having the clypeofrontal carina distinctly bituberculate and the anterior transverse pronotal carina strongly sinuous and flanked anteriorly on each side by a rather deep concavity. Parameres (Figs. 94–95) sharply toothed and with fine rough tubercles apically.

Variation, aside for size, the size and density of the punctation will vary as well as the sculpturing on the clypeal posterior surface. In some specimens, including the holotype, the surface is covered with fine irregular and rather rough tubercles, in other specimens the sculpturing is similar to the anterior clypeal surface.

Figures

FIGURES 31 – 36. Dorsal habitus. 31. D. ganglbaueri, male holotype; 32. D. vazdemelloi, male holotype; 33. D. refulgens, male holotype; 34. D. fractipes, male holotype; 35. D. fasces, male lectotype; 36. D. haroldi, male lectotype.

FIGURES 126 – 133. Metatarsus, ventral view. 126. D. ganglbaueri, holotype; 127. D. vazdemelloi, holotype; 128. D. refulgens, holotype; 129. D. fractipes; 130. D. fasces; 131. D. nitidicollis; 132. D. quadratus; 133. D. denticollis.

FIGURES 134 – 154. Primary type labels. 134. D. hirticollis; 135. D. pauliani; 136. D. renatii; 137. D. ater; 138. D. piceus; 139: D. telephus; 140. D. viridis; 141. D. viridipennis. 142. D. convexus; 143. D. fredericki; 144. D. angustipennis; 145. D. bahianus; 146. D. amyntas (= D. attalus); 147. D. ganglbaueri; 148. D. refulgens; 149. D. fractipes; 150. D. fasces; 151. D. haroldi; 152. D. nitidicollis; 153. D. quadratus; 154. D. similis; 155. D. denticollis.