Deltochilum (Aganhyboma) amandaarcanjoae, Silva, Fernando A. B., Louzada, Júlio & Vaz-De-Mello, Fernando, 2015

Silva, Fernando A. B., Louzada, Júlio & Vaz-De-Mello, Fernando, 2015, A revision of the Deltochilum subgenus Aganhyboma Kolbe, 1893 (Coleoptera: Scarabaeidae: Scarabaeinae), Zootaxa 3925 (4), pp. 451-504 : 465

Deltochilum (Aganhyboma) amandaarcanjoae new species

( Figs 2 , 8 , 89 , 98 )

Etymology. Named in honour of Amanda Arcanjo, wife of the first author and scarabaeine cytogeneticist.

Description. Body. Completely bluish-black or violaceous, with weak sheen or opaque. Elytra a little darker than head and pronotum ( Fig. 98 ). Ventral surface black, with blue or green sheen. Length 13 mm. Head. Dorsal surface with dense, but not confluent, foveiform punctures separated at center of dorsal interocular surface by approximately twice their diameter. Punctures located near the clypeus larger and closer compared to those from center of interocular surface. Anterior margin of each puncture not defined (impressed). Margin between clypeal teeth and genae curved outward approximately at halfway its length. Thorax. Pronotum with smooth aspect, covered by small punctures, apparently simple and uniformly distributed. Punctures on anterior angles larger, with a typical foveiform shape. Margin of pronotum (close to lateral angles) straight, without depression. Margin between lateral and posterior angles distinctly convex (curved outward). Posterior half of pronotum with rounded shape ( Fig. 98 ). Elytra. Lateral margins evenly curved outward ( Fig. 98 ). Elytral striae narrow and shiny, with carinate margins close and almost touching. Punctures of elytral striae small. Interstrial surface with small, dispersed foveiform punctures amid small bright ocellate punctures, randomly distributed. First interstria brighter than rest of elytra. Surface of second interstria with regular aspect. Basal carina of seventh interstria prominent and short ( Fig. 98 ). Length of apical carina of seventh interstria approximately two times that of apical carina of sixth interstria. Apical tubercle of second interstria present. Abdomen. Punctures large and conspicuous, concentrated anterolaterally on each sternite and reduced to a narrow belt along midline of abdomen. Pygidium with foveiform punctures over entire surface; punctures transverse, elliptical and almost confluent. Apex of pygidium rounded. Legs. Protibia widened along inner margin from basal third to apex; widened portion weakly indicated. Middle protibial tooth closer to apical tooth than to basal tooth. Apical third of metatibia curved inward; curvature softer than in other species of this complex ( Fig. 98 ). Inner margin of metatibia with a longitudinal row of small tubercles. Apex of metatibia with five clearly visible longitudinal carinae. Anterior edge of profemur completely emarginate, with abundant setae for about two-thirds of its length. Foveiform punctures of profemur with transverse elliptical shape. Metatarsus with approximately one-half of metatibia length.

Material studied. Holotype: BRAZIL: MATO GROSSO: Rosário Oeste, XII.1959 (1 ♂ DZUP).

Paratype [1]: PARAGUAY: CONCEPCIÓN: Horquetá, 1964, Martínez (1 ♂ CMN).

Diagnosis and remarks (within the trisignatum complex): bluish-black or violaceous coloration ( Fig. 98 ); margin of pronotum (close to lateral angles) straight, lacking depression; anterior edge of profemur completely emarginate. The following aedeagus characters are also diagnostic: parameres short, rounded at apex, in lateral view forming an angle of approximately 20° with phallobase ( Fig. 8 ). Lamella copulatrix: left lobe “J”-shaped (as in Fig. 33); right lobe baton-shaped, slightly curved (as in Fig. 33). Fronto-lateral peripheral sclerite (FLP) as in Fig. 50. Center of genital segment with a well-sclerotized portion and "T"-shaped ( Fig. 2 ).

Figures

FIGURES 1 – 3. Male genital sclerites in Deltochilum (Aganhyboma). 1. Position and nomenclature of endophallic sclerites (modified from Medina et al. 2013). 2. Nomenclature of the main parts of the genital segment (D. amandaarcanjoae new species). 3. Nomenclature of the main parts of the superior right peripheral sclerite (SRP) (D. paresi new species). Figures scale = 1 mm.

FIGURES 4 – 11. Aedeagus in Deltochilum (Aganhyboma). 4. D. titovidaurrei new species. 5. D. cupreicolle. 6. D. viridescens new status. 7. D. viridicatum new species. 8. D. amandaarcanjoae new species. 9. D. trisignatum. 10. D. cangalha new species. and D. alpercata new species. 11. D. finestriatum new species. Figures scale = 1 mm.

FIGURES 89 – 92. Known distribution of D. (Aganhyboma). 89. trisignatum complex. 90. cupreicolle complex. 91. acropyge complex. 92. finestriatum complex.

FIGURES 95 – 102. Species of D. (Aganhyboma). 95. D. trisignatum. 96. D. kolbei. 97. D. violaceum. 98. D. amandaarcanjoae new species. 99. D. cupreicolle. 100. D. titovidaurrei new species. 101. D. viridescens new status. 102. D. viridescens new status. Figures scale = 1 mm.