Dichotomius (Luederwaldtinia) gilletti, Valois & Vaz-De-Mello & Silva, 2017

Valois, Marcely C., Vaz-De-Mello, Fernando Z. & Silva, Fernando A. B., 2017, Taxonomic revision of the Dichotomius sericeus (Harold, 1867) species group (Coleoptera: Scarabaeidae: Scarabaeinae), Zootaxa 4277 (4), pp. 503-530 : 520-522

Dichotomius (Luederwaldtinia) gilletti sp. nov.

( Figs 7 a–h, 10f, 12c)

Etymology. The species is named after the British-Brazilian coleopterist Conrad Gillet, who collected this new species, as recognition for so many years of fruitful collaboration with the two last co-authors.

Material examined. Type material, Holotype. BRAZIL: PERNAMBUCO: Bonito, Mata da Colônia , (35°42’59.4”W; 08°30’12.3”S), Brejo de Altitude, 02-04.VI.2011 — F. Silva — 1♂ ( CEMT) . Paratypes [99 males and 69 females]. CEARÁ: Serra de Baturité, Uirapuru , (38°54'22"W; 04°17'27"S), III.2008, Gillett — 5♂ 1♀ ( CEMT) ; PARAIBA: Mata do Buraquinho , IX.1999, A. Endres — 1♀ ( CEMT) ; João Pessoa, Mata do Buraquinho , 26.IX.1999, A. Endres— 1♂ ( CEMT) ; PERNAMBUCO: Cabo, Reserva Ecológica de Gurjaú , (35°3'44"W; 8°12'44"S), VI.2003, S. Santos — 1♂ ( CEMT) ; same data but 25.V.03, Pitfall 4 — 2♂ (CE-UFPE); Iguarassu, Refúgio Ecológico Charles Darwin , (34°57'25"W; 7°48'37"S), I.2006, Costa et al. — 2♂ 2♀ ( CEMT) ; same data but I.2006, Fernando A. B. Silva — 1♀ (MZUFPA) ; same data but Reserva Ecológica de São José , XII.2009, T.B.Souza — 1♂ ( CEMT) ; Paudalho, Aldeia , (-35°,155862; -7,927864), 27.IX.2004, Fernando A. B. Silva— 2♂ (MZUFPA). Recife, (-34,8774; -8,046652), 26.IX.2005, L. Iannuzzi — 1♂ ( CEMT) ; same data but 01.XI.2005, Filgueiras, B. K. C — 2♀ ( CEMT) ; same data but 11.VIII.2005, (b1 - onivoro), Liberal, C. N. col. — 1♂ 1♀ ( CE- UFPE) ; same data but 01.XI.2005 — 1♀ ( CEMT) ; Sirinhaém, Usina Trapiche, Tauá fragment, 76msl (8°33'16"S, 35°9'27"W), 26.Vii.2010, Pitfall ( Fezes ) — 1♂ (CE-UFPE); Caruaru, Brejo de Altitude, [36°01'W, 8°09'S], 02- 04.VI.2011, F. Silva — 2♂ 4♀ (MZUFPA); Bonito, Mata da Colônia , Brejo de Altitude, (35°42’59.4”, 08°30’12.3”S), 02-04.VI.2011, F. Silva — 2♂ (MZUFPA) ; same data but 1♂ ( CEMT) ; Araçoiaba, CIMNC, 21. IV.2010, Pitfall (carne), Pessoa, K. K. T col. — 1♂ 1♀ (CE-UFPE); Camaragibe , Aldeia , (- 7.977°S, - 35.006°W), 100m, 01-30.V.2016, P. C. Grossi — 75 ♂ 54 ♀ ( CERPE) ; Aflitos , X.1987, Cicera— 1♀ ( CEMT) .

Diagnosis. D. gilletti sp. nov. can be easily distinguished from all the other species by: elytral interstriae surface wrinkled, with conspicuous longitudinal ridges ( Fig. 7 e); the anterolateral portion of clypeus, in dorsal view, lacking ocellate punctures or at most with weakly-defined transversal ridges ( Fig 7 b); disc of the pygidium smooth, with ocellate punctures restrict at the margins (as in Fig. 11 h).

Description. Length: 14–15 mm. Body brown to black with glossy bluish sheen on pronotum and elytral surfaces ( Fig. 7 a). Head: clypeal surface with weak transversal ridges ( Fig. 7 b). Gena with elliptical punctures ( Fig. 7 b). Clypeofrontal suture with a central and conical horn. Dorsal interocular surface slightly depressed on its central portion, with dense ocellate punctures; punctures denser near the eyes, spaced by less than their diameter ( Fig. 7 b). Pronotum: slightly convex in lateral view. Surface with dense ocellate punctures, spaced by their diameter ( Fig. 7 d). Punctures on anterolateral portion of pronotum larger and denser. Posterior margin with large and elliptical punctures forming an irregular band of punctures close to posterior fovea. Hypomera: posterolateral portion with setigerous punctures elongated longitudinally, margins of punctures almost touching. Lateral portion with a row of long setae, visible in dorsal view. Metasternum: disc smooth; anterior lobe of metasternum rugosepunctate, some punctures setigerous. Lateral lobes of metasternum with ocellate and setigerous punctures, setae long; punctures separated by 1–2 times their diameter. Elytra: surface shiny with weak bluish sheen. Legs: ventral surface of profemur with elliptical, sparse and setigerous punctures along midline. Ventral surface of mesofemur with setigerous punctures on apical third. Posterior margin of meso and metafemur with longitudinal sulcus along its length; sulcus approximately one-ninth as wide as the femur; surface of sulcus with well- defined microsculpture ( Fig. 11 d). Ventral surface of metafemur glabrous. Row of setae toward the body on ventral surface of mesotibia extending the entire length of the tibia (as in Fig. 11 e). Abdomen: surface of sternites with a single medial row of ocellate punctures; lateral portion densely punctate on anterior half. Male medial portion of sixth sternite half as long as the fifth. Pygidium: slightly wider than long. Disc smooth, ocellate punctures only near the margins (as in Fig. 11 h). Aedeagus: parameres subtriangular, 2/3 as long as the phallobase ( Fig. 7 f–h). [lateral view] — parameres narrowed toward apex ( Fig. 7 f). Dorsal margin of parameres slightly curved outward on apical half ( Fig. 7 f). Ventral margin of parameres almost straight on apical two-thirds; on basal third slightly curved outward ( Fig. 7 f). [ventral view] — inner margins of parameres slightly curved outward ( Fig. 7 g). [dorsal view] — basal portion of parameres wider than apical portion ( Fig. 7 h). External margin of parameres slightly expanded toward apex ( Fig. 7 h). Endophallus: lamella copulatrix — Projection subretangular; superior portion slightly curved outward; lateral portion curved inward medially ( Fig. 10 f). Secondary sexual characters: females differ from males by: more acute clypeal teeth ( Fig. 7 c); anterior surface of clypeus with well-defined transversal ridges ( Fig. 7 c). Medial portion of sixth sternite as long as the fifth.

Remarks. Specimens from Refúgio Ecológico Charles Darwin (RECD), Iguarassu, Pernambuco, Brazil, were referred to as D. aff. sericeus ( Costa et al. 2009; Silva et al. 2010). We have examined some of these specimens and after analysis we concluded that they correspond to the species described here as Dichotomius gilletti sp. nov. This species presents a generalist feeding behavior and is abundant in the Atlantic forest areas, representing approximately 85% of all individuals collected in the forest areas of RECD ( Costa et al. 2009; Silva et al. 2010).

Figures

FIGURE 7. Dichotomius gilletti sp. nov. a— body, dorsal view; b— head, male; c— head, female; d— pronotum; e— surface of elytral interstriae. Aedeagus. f— lateral view; g— ventral view; h— dorsal view.

FIGURE 10. Lamella copulatrix. a— Dichotomius sericeus (Harold, 1867); b— D. irinus (Harold, 1867); c— D. laevicollis (Felsche, 1901); d— D. schiffleri Vaz-de-Mello, Gavino & Louzada, 2001; e— Dichotomius guaribensis sp. nov.; f— Dichotomius gilletti sp. nov.; g— Dichotomius iannuzziae sp. nov.; h— Dichotomius catimbau sp. nov. Scale bar 0,5 mm.

FIGURE 11. External morphology of D. sericeus species group. a— Dichotomius sericeus (Harold, 1867), body, lateral view; b— D. schiffleri Vaz-de-Mello, Gavino & Louzada, 2001, body, lateral view; c— D. sericeus, detail of posterior margin of meso and metafemur, arrows; d— D. schiffleri, detail of posterior margin of meso and metafemur, arrows; e— D. sericeus, mesotibia, ventral view (row of setae toward the body, red arrow); f— D. irinus, mesotibia, ventral view (row of setae toward the body, red arrow); g— D. irinus, pygidium; h— D. sericeus, pygidium.