Cylloepus nessimiani, Sampaio, Brunno Henrique Lanzellotti, Passos, Maria Inês Da Silva Dos & Ferreira-Jr, Nelson, 2011

Sampaio, Brunno Henrique Lanzellotti, Passos, Maria Inês Da Silva Dos & Ferreira-Jr, Nelson, 2011, Three new species of Cylloepus Erichson (Insecta: Coleoptera: Elmidae) from Southeastern Brazil, Zootaxa 2797, pp. 57-64 : 60-61

Cylloepus nessimiani sp. nov.

( Figs. 4–6 )

Diagnosis. Head with close coarse granules. Pronotum with a pair of complete longitudinal sublateral carinae, wider at the median 2/4; shallow longitudinal impression, beginning at posterior fifth and reaching the anterior 2/5. Second interval of elytron with a submarginal carina, extending to anterior fifth of elytron, and third interval carinate on the anterior third; fifth and seventh intervals with carinae beginning on the humerus and extending to the apical 1/8. Male genitalia with the median lobe little longer than parameres, wider at basal third, with a feeble constriction at middle, narrowing on distal third toward a truncate apex; parameres wider at the basal third, narrowing abruptly, apices slightly curved inward.

Description. Holotype male: total length 3.50 mm; head width 0.62 mm, length 0.50 mm; pronotum width 1.10 mm, length 0.86 mm; elytra width 1.44 mm, length 2.01 mm. Body dark brown; antennae and mouthparts reddish brown.

Head with granules bigger than facet of eyes, separated by 1–1.5 diameter. Eyes prominent laterally and dorsally. Filiform antenna inserted near the frontoclypeal suture, with the last four antennomeres feebly wider at distal portion; antennomeres VIII–X with lateral tuft of setae; last antennomere with apical tuft of setae. Clypeus with anterior margin emarginate medially, and lateral angles slightly rounded. Labrum with anterior margin truncate, lateral angles rounded, and smooth surface, with fine and sparse setae on apical third.

Pronotum little wider than long (greatest width at the posterior 2/5); anterior margin feebly truncate, lateral margin convex and crenulate, posterior margin slightly biarcuate. Surface with punctures smaller than facet of eyes, separated by 1–2 diameters, some of them with a small seta. A pair of complete longitudinal sublateral carinae, wider on the median 2/4; with granules bigger than facet of eye, separated by less than one diameter; median longitudinal impression very shallow, beginning at the anterior fifth and reaching the posterior 2/5.

Elytra longer than wide (1.5:1), with lateral margin crenulate and subparallel, apices projected and slightly oblique, and elytral sutures apart at apex. Granules all over the elytral surface, bigger than facet of eye, separated by one diameter or less. Striae formed by rows of shallow punctures. First interstrial interval convex basally; second interval with a short submarginal carina extending to the anterior fifth; third interval carinate to anterior third; fifth and seventh intervals carinate from the humerus to the apical 1/8, outer carina feebly longer than the inner. Epipleura without tomentum and with granules similar to those of elytra. Scutellum as long as wide with truncate anterior margin, and convex lateral margin.

Hypomeron and prosternum with granules bigger than facet of eyes, separated by one diameter. Prosternal process wide, extending beyond the forecoxae; apex of prosternal process rounded with a small median projection. Mesosternum with small deep groove on anterior third, for reception of prosternal process. Metasternum with sparse granules on lateral areas and with a shallow median longitudinal impression.

Granules on coxae, trochanters, femora, and tibiae bigger than facet of eyes, separated by 1–2 diameters. Tomentum fringe on apical half on anterior face of foretibiae; apices of middle tibiae with fringe of tomentum on anterior and posterior faces (anterior fringe smaller than the posterior); all tibiae with an apical pair of spines. Tarsomeres with some setae on ventral surface.

Granules on abdomen surface smaller than facet of eyes, separated by 1–3 diameters. Ventrite I with a pair of carinae, each one beginning on the inner margin of hind coxae but not reaching the posterior margin of this ventrite. Ventrite V with acute lobes and convex posterior margin with small seta.

Male genitalia with median lobe extending little beyond the parameres; wider at basal third, narrowing toward a truncate apex. Basolateral apophysis approximately 1/4 median lobe length. Parameres wider at basal third, narrowing toward apex that bears small setae; parameres apices digitiform, feebly curved inward, with some sensilla. Phallobase longer than wide (1.5:1), slightly longer than half of genitalia length.

Variation. Female externally similar to male. Measurements of body may vary in total length 2.95–3.65 mm; head width 0.62–0.66 mm and length 0.37–0.46 mm; pronotum width 1.07–1.13 mm and length 0.88–0.90 mm; and elytra width 1.31–1.44 and length 2.05–2.30 mm.

Comparative notes. Cylloepus nessimiani sp. nov. and C. olenus Hinton, 1945 are the only species that have non-tomentose epipleura, but they differ in the median pronotal impression that is shallow and restricted to the middle 2/ 5 in the new species, and wide and complete on the posterior 2/ 3 in C. olenus ( Hinton, 1945) . The median impression of C. nessimiani sp. nov. is similar to that of C. typhon , whose impression is less distinct near the anterior and posterior margins. These two species can be distinguished by the lack of a median longitudinal depression on ventrite V in C. nessimiani sp. nov., which is present in C. typhon . The male genitalia of C. nessimiani sp. nov. and C. typhon differ as follows: in the new species the median lobe is wide from base to apex, and the parameres narrow toward the apex, whereas in C. typhon the median lobe narrows toward the apex and the parameres are wide from base to apex, with small processes turned outward. C. nessimiani sp. nov. can be distinguished from C. reitteri due to lacking three characteristics present on C. reitteri : median pronotal impression extending from posterior to anterior margin, a gibbosity on the metasternum, and a tooth on the middle of anterior margin of the prosternum.

Type material. Brazil, Rio de Janeiro, Nova Friburgo municipality. Holotype, male – Lumiar, tributary to Córrego Santa Margarida, 22°20’10.5”S 42°17’34.2”W, 970m, 16.XI.2008, Nessimian, J.L.; Jardim, G.A.; Gonçalves, I.C.; Alecrim, V.P.; Souza, M.R.; Sampaio, B.H.L. Leg. [ DZRJ Coleoptera 5550]. Paratypes, 1 male & 1 female—same data as holotype, 22°20’35.5”S 42°18’00.0”W, 844m, 17.XI.2008 Souza, M.R. Leg. [ DZRJ Coleoptera 5551]; 1 specimen – Rio bonito de Lumiar, Córrego das Paineiras, 22°23’23.7”S 42°20’04.8”W, 06.III.2009, Sampaio, B.H.L.; Oliveira, A.L.H.; Leg. [ DZRJ Coleoptera 5552]; 1 male & 1 female – Rio bonito de Lumiar, Córrego das Paineiras, 22°23’23.7”S 42°20’04.8”W, 05.III.2009, Sampaio, B.H.L. Leg. [ MNRJ]; 1 male – Brazil, Rio de Janeiro, Macaé municipality, Sana Córrego do Cólégio, light trap, 22°20’23.4”S 42° 12’ 13.5”W, 19.II.2009, Nessimian, J.L.; Jardim, G.A.; Gonçalves, I.C.; Dumas, L.L.; Sampaio, B.H.L. Leg. [ MZSP].

Etymology. This species is dedicated to Dr. Jorge Luiz Nessimian, for his important contribution to studies of Brazilian elmids.

Figures

FIGURES 4 – 6. Cylloepus nessimiani sp. nov., male. 4. Dorsal view; 5. Ventral view; 6. Male genitalia.