Dichotomius (Cephagonus) filgueirasi, Nunes & Vaz-de-Mello, 2019

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), Journal of Natural History 53 (37), pp. 2231-2351 : 2300-2301

2.5.: Dichotomius (Cephagonus) filgueirasi new species

( Figure 24 )

Diagnosis. distinguished from the other species in the group by the following combination of characteristics: males cephalic carina strongly transverseı larger than tallerı rounded apically; anterior portion of the pronotum bearing strongı coarse puncturesı widely emarginated and excavated anteriorly (as in D. punctulatipennis of bicuspis group); lateral margins of the pronotum serrate (as in D. baiano and D. fernandosilvai of fissus group); males ’ pronotal disc with four lobes at anterior portion and 5) elytra lacking microsculpture.

● HOLOTYPEı male: BRASIL: Alagoas: Ibateguara. Aquidabã. Banana. 16-iii-2008. BKC Filgueiras [at CEMT ].

● PARATYPES: same data of Holotype [8 ƋƋı 1 ♀ at CEMT]; no municipality. vi-1998 [1 Ƌı 2 ♀♀ at CEMT]; Paraíba: Mamanguape. REBIO Mamanguape. 6³41 ’ Sı 35 ³10 ʹ W. Pitfall. iii-2002. MIM Hernandéz [2 ƋƋ at CEMT]; same data but 17-ii-1999. A Endres [2 ƋƋ at CEMT]; Pernambuco: Recife. Campus UFPE [1 Ƌ at CEMT].

Description (holotype). BL: 22 mmı PW: 13 mm. Colour: black. Head: fronto-clypeal surface smooth. Genal surface wrinkled with striations and fine punctures. Inter-ocular surface with coarse punctures. Gena borders straight. Cephalic carina larger than tallerı rounded at apexı with striations on its base. Pronotum: borders serrate with scattered dense setae. Pronotal disc shinyı lacking punctuationı anterior portion with four lobesı a pair of them placed posteriorly and another pair placed more anteriorly. Anterior portion widely excavated and emarginated and filled with denseı coarse punctures. Posterior margin with two rows of ocellate punctures. Metasternum: sides and anterior portion of the 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: with clusters of 1 – 5 red setae at the sides of the ventrites. Punctuation at the anterior margin of the ventrites interrupted medially. Aedeagus ( Figure 24 (d-f)): parameraı apexes rounded dorsallyı convergent; longitudinal excavation taking 2/3 of paramera length; basal excavations wideı carinate; Laterallyı with a subtle declivity towards apex. Base excavated ventrallyı constrained at mid-point; subgenital plate rounded at the base and widely emarginate at apex.

Morphological variation. male BL: 16 – 22 mmı PW: 9 – 13 mm. Smaller males have a conical cephalic carina and lack pronotal lobes and knobs (or have it less developed) at anterior end of the disc. Females BL: 18 − 20ı PW: 10 – 11 mm and are distinguishable from the males by the following: Head: fronto-clypeal surface transversely wrinkled. Cephalic carina transversalı forming a weak pair of tubercles. Pronotum: punctures coarser than those of malesı posterior margin with two defined rows of elliptical punctuates. Pronotal borders strongly serrated. 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.

Distribution. Brazilian Atlantic forest in the states of Alagoas and Pernambuco ( Figure 17 ).

Etymology. named after Dr. Bruno Karol Cordeiro Filgueiras (Universidade Federal de Pernambucoı Brasil)ı who collected the holotype.

Figures

Figure 17. D. mundus: (a) male dorsal habitus; (b) female dorsal habitus; (c) female ventral habitus; (d) paramera dorsal view; (e) paramera ventral view; (f) paramera lateral view; (g) type labels.

Figure 24. D. filgueirasi: (a) male dorsal habitus; (b) female dorsal habitus; (c) female ventral habitus; (d) paramera dorsal view; (e) paramera ventral view; (f) paramera lateral view.