Dichotomius (Cephagonus) gardneri Nunes & Vaz-de-Mello 2019, new species
Creators: name: Nunes, Rafael V.
name: Vaz-de-Mello, Fernando Z.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Dichotomius
Dichotomius gardneri

description: 3.16.: Dichotomius (Cephagonus) gardneri new species
(Figure 37 (i-l))
Diagnosis. separated from other in the group by the following combined characters: males pronotum central emargination on anterior portion; males cephalic carina inserted both eyesı transversal with acute apex (similar to D. aielloae and D. asenjoi); elytral striae and puncture deeply impressed; males paramera lacking basal and longitudinal excavations and paramera subgenital plate taking 1/5 of the ventral surface.
● HOLOTYPE (male): BRASIL: Pará. Monte Dourado. 0³60 ʹ 20 ʹ ’ Sı 52³59 ʹ 07 ” W. Fezes. iv- 2006. T Gardner & MIM Hernandéz [at CEMT].
● PARATYPES: BRASIL. Pará. Óbidos. 1878. M Nathan [1 Ƌ at CEMT]; same municipality but xi-1989 [1 ♀ at CEMT].
Description (Holotypeı male). BL: 17 mmı PW: 9 mm. Colour: blackı shiny. Head: fronto-clypealı genal and inter-ocular surfaces smooth. Few weakly impressed fine punctures near eyes. clypeo-genal angle roundedı obtuse (100³). Cephalic carina longer than wideı conical with rounded apex. Pronotum: disc shinyı with central emargination – same width as interocular space. Posterior margin with a row of ocellate punctures. Metasternum: sides and margins of anterior lobe covered by long hair. Anterior portion of anterior lobe with ocellate setigerous punctures. Setigerous punctures equally spaced at sides. Elytra: striae deeply impressed having coarse punctures spaced by their diameter. Interstriae convexı disc lacking microsculpture with very fine punctures (20 x). Abdomen: ventrites with ocellate punctures concentrate at sides. Puncture of each ventrite interrupted medially as well as groove along the posterior margin of sixth ventrite. Aedeagus (Figure 37 (j-l)): dorsallyı paramere apexes roundedı convergent; longitudinal and basal excavations lacking; membranous part taking half of dorsal surface. Laterallyı subtle declivity from basis towards apex; lacking central excavation. Ventrallyı subgenital plate with rounded apexes and taking 1/5 of ventral surface.
Morphological variation. male BL is 17 mmı PW: 9 – 10 mm. Female BL: 16 mmı PW: 11 mmı distinguished from males as follows: Head: fronto-clypeal surface striated. Surface posterior to cephalic carina smooth. Cephalic carina transversalı with straight apex. Pronotum: simply convexı lacking lobes. Elytra: striae weakly impressedı punctures separated by twice their diameter. Blue sheen present near basis. Abdomen: sixth ventrite bearing a pair of tubercles on central portion.
Distribution. Brazilı state of Pará (Figure 34).
Etymology. named after Toby Gardner (Stockholm Environment Institute)ı who collected the type series.
description: Published as part of Nunes, Rafael V. & Vaz-de-Mello, Fernando Z., 2019, Taxonomic revision of Dichotomius (Cephagonus) Luederwaldt 1929 and the taxonomic status of remaining Dichotomius Hope 1838 subgenera (Coleoptera: Scarabaeidae: Scarabaeinae: Dichotomiini), pp. 2231-2351 in Journal of Natural History 53 (37) on pages 2322-2323, DOI: 10.1080/00222933.2019.1692088, http://zenodo.org/record/3665519