Sennius nappi Ribeiro-Costa & Reynaud, 1998

Viana, Jéssica Herzog & Ribeiro-Costa, Cibele Stramare, 2013, Review of the largest species group of the New World seed beetle genus Sennius Bridwell (Coleoptera: Chrysomelidae), with host plant associations, Zootaxa 3736 (5), pp. 501-535 : 524

Sennius nappi Ribeiro-Costa & Reynaud, 1998

( Figs 72–74 )

Sennius nappi Ribeiro-Costa & Reynaud, 1998: 249 (original description, distribution, type, figures, host); Caron et al. 2004: 5 (egg description); Sari et al. 2005:169–174 (biology); Sari & Ribeiro-Costa 2005:521–525 (biology); Viana & Ribeiro- Costa 2013 (redescription, distribution, type, host, figures).

Redescription. Dimension. BL: 1.80–2.84 mm; BW: 1.08–1.72 mm.

Elytra completely black or generally with submedian horizontal, irregular, orange red to dark brown maculae, extending from 3rd or 4th to 8th or 9th interstices, sometimes maculae with darker color extending to apical region, rarely elytra without maculae ( Fig. 72 ). Male genitalia with hinge sclerites long, moderately curved with apex and base broader; apical region with group of spicules near ventral valve; subapical region with long and dense group of short spicules apparently forming three vertical groups; submedian region with tree groups of long spicules, two lateral and one medial; latero-basal lobes of internal sac with dense and long spicules; basal region with dense denticles throughout ( Fig. 73 ). Tegmen with lateral lobes separated by emargination about 0.7 times their length ( Fig. 74 ).

Material examined and detailed diagnosis. See Viana & Ribeiro-Costa 2013.

Distribution. BRA (Mato Grosso, Mato Grosso do Sul, Rio de Janeiro, Paran).

Host plants. FABACEAE : Caesalpinioideae : Senna multijuga , S. neglecta var. oligophylla , S. neglecta var. neglecta , S. rugosa (G. Don) Irwin & Barneby, S. occidentalis, S. obtusifolia .

Diagnosis. S. nappi is more similar to S. transversesignatus , sharing some external characters and the male genitalia pattern from subgroup 1. Sennius nappi differs externally from S. transversesignatus by the color of the last seven antennomeres, the absence of white setal patches near the base of the elytron and some characters in the internal sac: the region where the lateral clusters is located and the absence of two moderately dense clusters of large spicules in the basal region.

Figures

FIGURES 72 – 74. Sennius nappi. 72, dorsal view; 73, 74 male genitalia: 73, median lobe with hinge sclerites, others sclerites magnified of internal sac; 74, tegmen.