Taxonomic revision of Dichotomius (Cephagonus) Luederwaldt 1929 and the taxonomic status of remaining Dichotomius Hope 1838 subgenera (Coleoptera: Scarabaeidae: Scarabaeinae: Dichotomiini) Author Nunes, Rafael V. Author Vaz-de-Mello, Fernando Z. text Journal of Natural History 2019 2020-01-13 53 37 2231 2351 journal article 24063 10.1080/00222933.2019.1692088 e6443eb6-bfcc-44a6-a547-7af9a94d4a7d 1464-5262 3665519 2.6.: Dichotomius (Cephagonus) seag new species ( Figure 25 ) Diagnosis. distinguished from the other species in the group by the following combination of characteristics: males ’ cephalic carina longer than wideı with a rounded apex (as in medium males of D. bicuspis of bicuspis group); anterior and posterior pronotum portions with very fine punctuation (viewed under 30x magnification); males ’ pronotal disc with a single-rounded lobe at the anterior portion (as in D. fissus of the same group); pronotal margin smooth and; elytral striae with indistinct punctuation. ● HOLOTYPEı male : GUYANNE FRANÇAISE: Cayenne : Nouragues Biological Reserve. Fezes Allouatta . iii-1997 . F Feer [at CEMT ]. ● PARATYPES : same data of Holotype [1Ƌ]; SURINAME : Sipawilini . Palumeu River. 2³28 ’ Sı 55 ³37 ʹ W . iii-2012 . T Larsen [2 ƋƋ at CEMT ]. Description. (maleı holotype ): BL: 23 mmı PW: 13 mm . Colour: blackı with brown elytra. Head : fronto-clypealı genal and inter-ocular surfaces smooth. Gena borders slightly curved inwards. Cephalic carina longer than wideı rounded at the apex. Pronotum : borders smoothı not serrated. Pronotal disc shinyı lacking punctuation and delimited anteriorly by a singleı rounded lobe. Anterior portionı including excavation and anterior angles with very fineı equally spaced punctures (viewed under 20x magnification). Posterior margin with two rows of small ocellate punctures. Metasternum : sides and anterior portion of anterior lobe covered by dense red setae. Setigerous punctuation equally spacedı where present. Elytra : striae weakly impressed lacking distinct punctuation. Striae expanding near the base forming foveae. Interstriae brown colourı lacking microsculpture. Abdomen : glabrousı punctuation of ventrites anterior margininterrupted medially. Aedeagus ( Figure 21 (c-e)): parameraı apexes rounded dorsallyı convergent; longitudinal excavation taking 3/4 of paramera length; basal excavations rounded. Laterallyı subtle declivity towards apex; posterior margin with an emargination near junction with phalobasis. Ventrallyı sclerotised portion excavatedı forming a groove constrained at mid-portion; subgenital plate rounded at basis and emarginated at apex. Morphological variation. male BL: 17 – 23 mmı PW: 9 – 13 mm . Female BL: 17 mmı`PW: 9 mm and is distinguished from males as follows: Head: fronto-clypeal surface with coarse puncture. Cephalic carina transversalı forming a weak pair of tubercles. Pronotum: simply convexı lacking lobes. Elytra: striae deeply impressedı punctures separated by twice their diameter. Abdomen: sixth ventrite bearing a pair of triangular projections reaching pygidium apical margin ( Figure 9 (b)). Distribution. French Guyanaı Suriname ( Figure 20 ). Etymology. named after the Société Entomologique Antilles Guyane (SEAG)ı responsible for the holotype collection.