Dichotomius (Selenocopris) rodrigoi Kohlmann and Solís, 1981

Valois, Marcely C., Silva, Fernando A. B. & Vaz-de-Mello, Fernando Z., 2022, A taxonomic revision of the globulus species group of Dichotomius Hope, 1838 (Coleoptera: Scarabaeidae: Scarabaeinae), Journal of Natural History 56 (1 - 4), pp. 119-147 : 142-143

Dichotomius (Selenocopris) rodrigoi Kohlmann and Solís, 1981

( Figures 2 (m–r), and 6))

Dichotomius rodrigoi Kohlmann and Solís 1981: 345 , 366; Solis and Kohlmann 2012: 6.

Diagnosis

Dichotomius rodrigoi can be easily distinguished from other species of the group by having strong pre-apical teeth on dorsal surface of paramera ( Figure 2 (p)). Regarding external characters, the species can be diagnosed based on the following combination of characters: pronotum covered with umbilicate punctures; male having a distinct anteromedial declivity on pronotum ( Figure 2 (m)); elytral striae thin, distinctly punctate; elytral interstriae shagreened, covered with dense, coarse punctures; pygidium wide in male, twice wider than long, rounded at apex, surface covered with coarse punctures spaced by their diameter.

Redescription (male)

Body length: 10 mm. Dorsum black, opaque ( Figure 2 (m)). Head: clypeal edge bidentate, teeth acute, separated by a shallow V-shaped emargination. Clypeogenal junction rounded. Surface covered with dense ocellate punctures, which become more sparse on the anterior region of the clypeus. Cephalic process produced into a small central tubercle. Thorax: pronotum approximately twice wider than long. Pronotal disc convex, anteromedian region of the disc with a shallow central impression; surface with equally spaced ocellate punctures. Hypomera surface with dense ocellate setiferous punctures, setae short, scattered and not present in all punctures. Prosternum covered with ocellate punctures. Mesoventrite covered with ocellate punctures usually bearing short orange setae. Metaventrite densely punctate, except on disc. Width of anterior region of metaventrite half the length of metafemora; surface with ocellate punctures deeply impressed. Meso-metaventral suture distinct. Mid-longitudinal sulcus feebly marked posteriorly. Elytra: slightly convex in lateral view. Humeral callus distinct. Striae thin and with welldefined punctures, spaced by their diameter. Interstriae I–VII slightly convex, opaque. Legs: protibial spur curved at apical fifth. Metatibial spur deeply emarginate apically. Ventral surface of the profemora covered with coarse setiferous punctures all over its extension. Ventral surface of the mesofemora with coarse punctures at apical third. Ventral surface of the metafemora with coarse punctures concentrated on apical half, basal half with more sparse, scattered punctures. Meso and metafemora bearing a thin longitudinal groove along its entire extension, wider on apical half. Abdomen: ventrites covered with ocellate punctures in lateral regions, punctures in medial region in a single row along anterior edge. Pygidium twice wider than long, disc distinctly convex in lateral view. Region adjacent to the pygidial edge sulcate. Apex of the pygidium margined. Tegmen: in dorsal view, paramera rectangular, one-third longer than its width medially, apex slightly obliqualy truncate; inner edges close to each other at basal fifth. Apical half significantly narrower than base in lateral view ( Figure 2 (r)). Ventral sclerotised membrane between paramera thinner and curved at basal half; angulate laterally ( Figure 2 (p)). Female: sixth ventrite 3 times longer than fifth.

Type material examined

Holotype of Dichotomius rodrigoi ♂ [ MNCR]: ‘Puntarenhas Costa Rica/P. de Osa. Ranono Quemado/29 myo de 1988/A. Solis’ // ‘ Dichotomius rodrigoi /Kohlmann and Solís’ // ‘ COSTA RICA INBIO/[barcode] CRI001 027516’ // ‘HOLOTYPO/ Dichotomius rodrigoi / Kohlmann y Solís’. Examined via photographs ( Figure 2 (o)).

Figures

Figure 2. Holotypes. Dichotomius danieli, male: (a,b) Dorsal and ventral views; (c) labels; (d–f) tegmen in dorsal, ventral and lateral views; D. favi, male: (g,h) dorsal and ventral views; (i) labels; (j–l) tegmen in dorsal, ventral and lateral views. D. rodrigoi, male: (m,n) dorsal and ventral views; (o) labels; (p–r) tegmen in dorsal, ventral view and lateral views. Lectotype D. globulus, male: (s,t) dorsal and ventral views; (u) labels.