Dendropaemon (Onthoecus) lydiae 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) : 59-61

29. Dendropaemon (Onthoecus) lydiae Génier & Arnaud , new species

( Figs. 29 , 88–89, 124, 159)

Type locality. Cameta, Amazones.

Diagnosis. The large size, rather thick body combined with the red to green metallic sheen will separate D. lydiae from most other species. It can be separated from D. refulgens by its less convex dorsum and much more robust posterior tibia which is completely covered with irregular sculpturing and punctures. Differs from D. morettoi by the shape of the anteromedian pronotal carina which is subangulate medially in female and is bordering anteriorly a distinct concavity in the male.

Description. Male holotype ( Fig. 29 ). Body. Body large, length 18.0 mm, maximum width 10.0 mm; body subrectangular; dorsum convex. Color. Dorsal surface black, glossy, with metallic sheen; head with red metallic sheen on posterior portion of clypeus, genae and frons; pronotum with red metallic sheen, except on anteromedian carina, small irregular area on disc and anterior to lateral fossae; elytra with red metallic sheen, except on humeral and apical umbone; ventrum dark brown to black; pygidium with red metallic sheen; legs black. Head. Clypeus broadly arcuate, anterior portion upturned; clypeal teeth obtusely triangular; clypeal median emargination broadly v-shaped, clypeal edge emarginate on external side of each clypeal tooth, clypeal teeth ventral surface with a fine v-shaped carina, clypeal margin ill-defined, bordered posteriorly by a more or less regular row of punctures, clypeal surface with transverse blunt rugulae; clypeogenal suture well-defined, bluntly carinate internally; genal surface with small and blunt irregular tubercles, lacking distinct transverse carina, concave laterally and convex internally; clypeofrontal carina rather low, approximately 4 times wider than high, slightly arcuate in dorsal view, simply carinate, clypeofrontal carina apical edge straight in frontal view; eyes small in dorsal view, interocular ratio 5.8. Pronotum. Pronotum transverse in dorsal view, pronotal width/length ratio 1.5; disc of pronotum finely punctate basally, punctures changing into fine blunt rugulae anterolaterally, with an ill-defined shallow longitudinal depression on posterior half; pronotal anterior margin slightly wider and concave lateral to eye; anterior portion with a strongly tri-sinuous carina transversally tuberculate medially; anterior angles surface with more or less rough and irregular fine tubercles, similar to lateral margin along posterior edge of anterior margin; lateral fossae simply rounded, concave; lateral portions slightly 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 1.2; 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, adjacent strial edge encroaching on interval, stria 1 well-defined apically, connecting to marginal stria; interstriae slightly convex, minutely punctate throughout, surface glossy. Thoracic sterna. Proepisternal carina reduced, present along coxal insertion only; metasternal median lobe angularly produced anteromedially, ventral ridge welldefined, v-shaped. Legs. Profemur posterior surface slightly but distinctly convex, rather coarsely punctate and glabrous internally, posterointernal margin rather thick, evenly developed, internal edge rather wide, with a contiguous row of setae along anterointernal edge and few scattered long setae on anterior half, remaining surface irregularly punctate. Protibia with four teeth on lateral edge; internal basal angle bluntly lobate; anterior surface with long aligned row of setae internally, surface glossy or feebly microsculptured between punctures; posterior surface with some well-defined punctures externally to median carina, surface between punctures finely and irregularly microsculptured, with a single interrupted setal row along lateral teeth. Mesofemur unmodified 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 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 lobate beyond tibial insertion, surface coarsely microsculptured, anterior surface with a row of irregular punctures, punctures not bordered anteriorly by a sharp and well-define sulcus. Metatibia robust, short, slightly widening toward apex in anterior view, anterior surface completely covered with irregular sculpturing and punctures, metatibial posterior surface concave between longitudinal row of setae and lateral edge, surface dull and irregularly punctate. Metatarsus 3-segmented ( Fig. 124 ), 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 more than three unaligned row of setae laterally, glabrous medially; sternite 7 approximately longitudinally flat medially, subequal in length to segment 6 along midline; pygidium finely punctate on disc. Male genitalia (Figs. 88–89). Parameres concave before apex; with minute raspy tubercles apically.

Measurements (3 males, 7 females). Length: male 17.0–18.0 (17.3±0.6), female 15.0–20.0 (18.3±2.0) mm.

Primary type data. Holotype male (MNHN): [Cameta/ Amazones/ M. de Mathan]; Dendrop. refulgens Wth. / det. G. OLSOUFFIEFF] partly handwritten; [WORLD/ SCARAB./ DATABASE/ WSD00016632]; [HOLOTYPE / Dendropaemon / lydiae n.sp. / Génier & Arnaud, 2014] red card.

Material examined. BRAZIL: ACRE, Parque Zoobotânico da Universidade Federal do Acre, Rio Branco, (9°57'8''S, 67°52'23''W), ii.1997, coll. F. Z. Vaz de Mello— 1 female (paratype) ( CEMT); AMAZONAS, Cametá, (6°10'S, 64°14'W), [no date], coll. M. de Mathan— 1 male (holotype) ( MNHN); Ega [=Tefé], (3°22'S, 64°42'W), [no date], coll. [anonymous]— 1 female (paratype) ( MNHN); Lg. Galomãnha, Rio Unini, Resex Unini [= Reserva Extrativista Rio Unini], (1°37'S, 62°59'W), 13–28.vii.2004, coll. M.L. Oliveira, L. Aquino & A Silva-Filho— 1 female, 1 male (paratypes) ( CEMT); Rio Parauary, (4°36'S, 57°47'W), 15.iii.1937, coll. Zellibor-Hauff— 1 female allotype ( CMNC); MATO GROSSO, Municipio Cotriguaçu, (9°51'28''S, 58°24'50''W), v.2011, coll. R.E Vicente— 1 female (paratype) ( CEMT); Vale da Solidão, Municipio Diamantino, (14°22'13''S, 56°7'12''W), 31.i.2009, coll. D.C.T. Oliveira— 1 male (paratype) ( CEMT); PARÁ, Jacareacanga, (6°13'35''S, 57°46'9''W), xii.1972, coll. M. Alvarenga— 1 female (paratype) ( CPFA); RORAIMA, Ilha de Maracá, (3°25'N, 61°40'W), ix.1996, coll. Ribeiro & Vaz-de-Mello— 1 female (paratype) ( CEMT).

Etymology. Lydiae , a patronym consisting of the Latinized form of the name Lydie. In honor of the late Lydie Arnaud, spouse of the junior author.

Natural history. Unknown.

Remarks. Females differs by their tri-sinuate anteromedian pronotal carina which is more evenly developed. In male the carina is strongly and transversally tuberculate medially and the carina is much reduced on a short distance on each side of the tubercle.

The six known specimens are variable, and some might be recognized as representing distinct species once more material becomes available. However, at this time this variation will be treated as intraspecific. This variation is seen in leg morphology in the following form: in the holotype and the specimen from Roraima the metatibiae and metatarsi are significantly more slender.

Figures

FIGURES 25 – 30. Dorsal habitus. 25. D. inemarginatus, female holotype; 26. D. nigritulus, male holotype; 27. D. amyntas, male; 28. D. attalus, male holotype; 29. D. lydiae, male holotype; 30. D. morettoi, male holotype.

FIGURES 118 – 125. Metatarsus, ventral view. 118. D. fredericki, holotype; 119. D. angustipennis; 120. D. bahianus; 121. D. nigritulus, paratype; 122. D. amyntas; 123. D. attalus; 124. D. lydiae, paratype; 125. D. morettoi, paratype.