Dichotomius (Luederwaldtinia) catimbau, 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 : 526-528

Dichotomius (Luederwaldtinia) catimbau sp. nov.

( Figs 9 a–h, 10h, 12d)

Etymology. The species name is a toponym in apposition referring to the type locality.

Material examined. Type material, Holotype. BRAZIL: PERNAMBUCO: Buíque, Vale do Catimbau , 24.VI.2006, C. N. Liberal — 1♂ ( CEMT) . Paratypes [6 males and 3 females]. Same data as holotype — 4♂ 3♀ (CEMT); same but Parna Catimbau , 778 mosl, 08.III. 2007 — 1♂ (CE-UFPE).

Diagnosis. Dichotomius catimbau sp. nov. is similar to D. guaribensis sp. nov. and D. gilletti sp. nov. in having pronotal disc with ocellate punctures ( Figs 6 d, 7d, 9d) and the disc of the pygidium smooth, with ocellate punctures only on the margins (as in Fig. 11 h). It can be distinguished from D. gilletti sp. nov. by the punctate surface of elytral striae, lacking conspicuous longitudinal ridges. It can be distinguished from D. guaribensis sp. nov. by the metasternum bearing ocellate punctures on its anterior lobe spaced by approximately their diameter ( Fig. 9 e); margin of lateral lobes of the metasternum, near metepisternum, with dense ocellate punctures; punctures smaller than to those on central portion of the lobe. The shape of the parameres and lamella copulatrix are also diagnostic. In lateral view, the dorsal margin of parameres is slightly curved outward on apical half ( Fig. 9 f); ventral margin of parameres almost straight on apical two-thirds; on basal third slightly curved outward ( Fig. 9 f). In dorsal view, the basal portion of parameres slightly wider than apical portion ( Fig. 9 h). Lamella copulatrix with subretangular projection; lateral portion of projection curved inward medially ( Fig. 10 h).

Description. Length: 15–16 mm. Body black with glossy bluish sheen on pronotum and elytral surfaces ( Fig. 9 a). Head: anterolateral portion of clypeal surface with oblique rows of shallow punctures ( Fig. 9 b). Posterior portion of clypeus with ocellate punctures ( Fig. 9 b). Gena with dense ocellate punctures, separated from each other by approximately their diameter. Dorsal interocular surface slightly depressed on its central portion, with dense ocellate punctures ( Fig. 9 b). Clypeofrontal suture with a central and conical horn. Pronotum: convex in lateral view. Surface of disc with ocellate punctures separated from each other by approximately twice their diameter; punctures on anterolateral portion of pronotum larger and denser. Posterior margin of pronotum with large ocellate punctures, near posterior angles. Hypomera: posterolateral portion with elliptical and setigerous punctures separated from each other by approximately their width. Metasternum: disc smooth. Elytra: interstriae slightly convex; surface densely punctate, with glossy bluish sheen (as in Fig. 5 e). Elytral striae punctate and deeply impressed. Legs: ventral surface of profemur with sparse and setigerous punctures along midline. Anterior margin of profemur with a thin longitudinal sulcus; surface of sulcus with well-defined microsculpture. Ventral surface of mesofemur with few setae near the apex. Ventral surface of metafemur glabrous. Posterior margin of meso and metafemur with a longitudinal sulcus on apical half (as in Fig. 11 c). Row of setae toward the body on ventral surface of mesotibia restricted to apical third of tibia (as in Fig. 11 f, arrow). Abdomen: surface of sternites with a single medial row of ocellate punctures; lateral portion with ocellate punctures on anterior half. Male medial portion of sixth sternite as long as half of the fifth. Pygidium: slightly wider than long. Disc smooth, ocellate punctures only near the margin (as in Fig. 11 h). Aedeagus: parameres subtriangular, 2/3 as long as the phallobase ( Fig. 9 f–h). [lateral view] — parameres narrowed toward apex ( Fig. 9 f). [ventral view] — inner margins of parameres slightly curved outward ( Fig. 9 g). [dorsal view] — external margin of parameres slightly expanded toward apex ( Fig. 9 h). Endophallus: lamella copulatrix — Projection subretangular; superior portion slightly curved outward. Secondary sexual characters: females differ from males: by more acute clypeal teeth ( Fig. 9 c); surface of clypeus with well-defined transversal ridges ( Fig. 9 c);medial portion of sixth sternite as long as the fifth.

Figures

FIGURE 5. Dichotomius schiffleri Vaz-de-Mello, Gavino & Louzada, 2001. a— body, dorsal view; b— head, male (weak knobs, arrows); c— head, female (transversal ridges, arrows); d— pronotum; e— surface of elytral interstriae. Aedeagus. flateral view; g— ventral view; h— dorsal view.

FIGURE 6. Dichotomius guaribensis sp. nov. a— body, dorsal view; b— head, male; c— head, female; d— pronotum; emetasternum. Aedeagus. f— lateral view; g— ventral view; h— dorsal view.

FIGURE 9. Dichotomius catimbau sp. nov. a— body, dorsal view; b— head, male; c— head, female; d— pronotum; emetasternum. 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.