Dichotomius (Cephagonus) fernandosilvai 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 fernandosilvai

description: 2.4.: Dichotomius (Cephagonus) fernandosilvai new species
(Figure 23)
Diagnosis. distinguished from the other species in the group by the following combination of characteristics: males ’ cephalic carina strongly transverseı larger than tallı slightly emarginated at apex; anterior portion of pronotum bearing coarse punctuation (as in D. filgueirasi of fissus group); pronotal margin serrate (as in D. baiano and D. filgueirasi); males ’ pronotal disc with a pair of central knobs at anterior portion; posterior margin of elytra with elliptical punctures (Figure 14 (d)) and elytra lacking microsculpture. This species resembles smaller males of D. filgueirasi (also occurring in the state of Pernambuco)ı differences are concentrated on the pronotal knobs (D. filgueirasi tends to lack it) and differentiation by paramera.
● HOLOTYPEı male: BRASIL: Pernambuco: Caruaru. Parque Ecológico João Vasconcelos Sobrinho. Pitfall. 12-vi-2008. FAB Silva [at CEMT].
● PARATYPE: same data of Holotype [1 ♀ at CEMT].
Description (holotype). BL: 19 mmı PW: 12 mm. Colour: blackı shiny. Head: frontoclypeal surface smooth. Genal surface strongly wrinkled. Inter-ocular surface with coarse punctures. Gena borders straight. Cephalic carina larger than tallerı emarginated at apexı with striations at the base. Pronotum: borders serrate. Pronotal disc shinyı lacking punctures and with a central pair of knobs at anterior portion. Anterior excavation and anterior angles filled with coarse puncture. Posterior margin with two rows of elliptical punctures. Metasternum: sides and anterior portion of anterior lobe covered by dense red setae. Setigerous punctures equally spacedı where present. Elytra: striae weakly impressed with weak punctures. Punctures separated by twice their diameter. Interstriae flatı lacking microsculpture. Abdomen: glabrous and lacking distinct row of continuous punctuation along anterior margin of the ventrite. Aedeagus (Figure 23 (d-f)): parameraı apexes rounded dorsallyı convergent; longitudinal excavation taking only 1/5 of paramera length and restricted to apex; basal excavations weakı transversalı reaching the sides of the paramera. Laterallyı with a subtle declivity towards the apex; excavation near to the posterior border occupying half of paramera length towards the base. Ventrallyı a pair of wideı round excavations; subgenital plate rounded at the base and widely emarginated at the apex.
Morphological variation. female BL: 19 mmı PW: 11 mm and distinguishable from the male by the following: Head: fronto-clypeal surface transversely wrinkled. Cephalic carina transversalı forming a weak pair of tubercles. Pronotum: punctuation coarser than that of malesı posterior margin with two defined rows of elliptical punctures. Pronotal borders strongly serrate. Elytra: striae deeply impressedı punctures separated by twice their diameter. Abdomen: sixth ventrite bearing a pair of triangular projections reaching the apical margin of the pygidium (Figure 9 (b)).
Distribution. municipality of Caruaruı state of Pernambucoı Brazil (Figure 20).
Etymology. named after Dr. Fernando Augusto Barbosa Silva (Universidade Federal do Paráı Brasil)ı who collected the holotype.
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 2299-2300, DOI: 10.1080/00222933.2019.1692088, http://zenodo.org/record/3665519