Sennius vivi

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 : 530-532

Sennius vivi sp nov.

( Figs 100–107 )

Description. Dimension. BL: 1.8–2.4 mm; BW: 1.3–1.6 mm.

Integument color. Head, thorax, elytra and pygidium reddish brown to black ( Figs 100–103 ); antennomeres entirely pale brown ( Figs 101, 102 ). Legs red-orange, except external surface of hind femur pale to dark brown ( Fig. 101 ).

Pubescence. Head with moderately dense white setae, except for small golden dense patch posterior to postocular lobe; labrum with lined golden setae medially, denser apically ( Figs 101, 102 ). Pronotum with sparse black setae, golden and denser on lateral third and in midline. Elytra with white setae in 1st strial interval; pale yellow setae in median region of 2nd strial interval, forming horizontal strip on anterior region of 3rd to 11th interstices and sometimes on subapical region of 7th strial interval, remainder of elytra with brown setae ( Fig. 100 ). Ventral surface with moderately dense white setae, denser on posterior region of metepisternum and on distal region of hind coxa ( Fig. 101 ). Pygidium pale yellow and with golden setae, denser at basal region and on midline ( Fig. 103 ).

Head with frons slightly convex, frontal carina present and ocular sinus deep, about half length of eye ( Fig. 102 ). Antennomeres 1 and 3 filiform, 2 and 4 moniliform, 5–10 wider than long, 11 globular but pointed apically. Disc of pronotum strongly sulcate at basal lobe. Elytra without denticle at base of strial. Hind femur on ventral margin with very prominent tooth (0.03–0.07 mm), not microserrate ( Fig. 104 ); hind tibia with lateroventral carina not reaching half its length ( Fig. 105 ).

Male genitalia. Median lobe strongly sclerotized, about 5.6 times longer than wide medially, apex strongly expanded. Ventral valve triangular with round apex and lateral margins sinuous. Internal sac with hinge sclerites long, moderately curved with apex and base broader; apical region with group of spicules near ventral valve and long and dense group of short spicules continuing on subapical region; subapical region with short and moderately dense group of short spicules; submedian region with two small groups of coarser spicules than those of subapical region and dense denticles on medial region; latero-basal lobes of internal sac with dense and long spicules; basal region with serrate denticles near gonopore ( Fig. 106 ). Tegmen with lateral lobes separated by emargination about 0.9 times their length ( Fig. 107 ).

Material examined. Types (23): Holotype and allotype deposited in DZUP. Holotype labels: “Coleção \ M. Alvarenga”(Light brown) “ARAGARÇAS \ Goiás Brasil \ 23.IX. 954 \ Moacir Alvarenga”(Light brown) “ HOLOTYPE \ Sennius vivi \ Viana & Ribeiro-Costa”(Red). Allotype labels: “DPTº ZOOL \ UF-PARANÁ”(Light brown) “BAIXO GUANDU-E.STO. \ BRASIL 2–9/I/71 \ Tadeu & C. Elias col. ”(Light brown) “ALLOTYPE \ Sennius vivi \ Viana & Ribeiro-Costa”(Red); 21 paratypes deposited in DZUP, MZSP, MNRJ, TAMU, USNM, FSCA, CEAM and CNCI, lables: BRA: Ceará: 5, “Coleção \ M. Alvarenga”(Light brown) “BARBALHA \ Ceará Brasil / V-1969 \ M. Alvarenga”(Light brown) “ PARATYPE \ Sennius vivi \ Viana & Ribeiro-Costa”(Yellow) (3, DZUP; 1, FSCA; 1, MZSP); Goiás: 1, “Coleção \ M. Alvarenga”(Light brown) “ARAGARÇAS \ Goiás Brasil \ 23.IX. 954 \ Moacir Alvarenga”(Light brown) and same paratype label (TAMU); Espírito Santo: 1, “DPTº ZOOL \ UF-PARANÁ”(Light brown) “BAIXO GUANDU-E.STO. \ BRASIL 15–21/X/70 \ Tadeu & C. Elias col.”(Light brown) and same paratype label (MNRJ); 2, “DPTº ZOOL \ UF-PARANÁ”(Light brown) “BAIXO GUANDU- E.STO. \ BRASIL 9–15/XII/70 \ C. Elias leg. ”(Light brown) and same paratype label (1, DZUP; 1, CEAM); Distrito Federal: 1, “ Brasília –DF \ 14/4/89 \ C. A. D. Texeira”(Light brown) “162–Ce \ Fedegoso”(Light brown) and same paratype label (CEAM); 1, “Brasília-DF \ 14/4/89 \ C. A. D. Texeira”(Light brown) “163–Ce \ Fedegoso”(Light brown) and same paratype label (MNRJ); 1, “ Brasília –DF \ 14/4/89 \ C. A. D. Texeira”(Light brown) “164–Ce \ Fedegoso”(Light brown) and same paratype label (MZSP); 1, “ Brasília –DF \ 14/4/89 \ C. A. D. Texeira”(Light brown) “171–Ce \ Fedegoso”(Light brown) and same paratype label (TAMU); 1, “Brasília-DF \ 02/ 5/89 \ C. A. D. Texeira”(Light brown) “277–Ce \ Fedegoso”(Light brown) “ Senna obtusifolia ”(Light brown) and same paratype label (CNCI); 1, “Brasília-DF \ 10/5/89 \ C. A. D. Texeira”(Light brown) “297–Ce \ Fedegoso”(Light brown) and same paratype label (DZUP); São Paulo: 1, “BRASIL-SP BALSAMO \ DATA, 3/V/ 87 \ SERINGUEIRA \ COL. BERGMANN, E. C. ”(Light brown) “110 \ AL”(Light brown) “ Sennius sp. 1 \ C.S. Ribeiro-Costa det. 1991”(Light brown) and same paratype label (FSCA); 1, “BRASIL-SP BALSAMO \ DATA, 3/ IX/87 \ SERINGUEIRA \ COL. BERGMANN, E. C. ”(Light brown) “438 \ BA”(Light brown) and same paratype label (DZUP); 2, “BRASIL-SP BALSAMO \ DATA, 17/IX/87 \ SERINGUEIRA \ COL. BERGMANN, E. C. ”(Light brown) “320 \ AL”(Light brown) and same paratype label at the same pin (USNM); 1, “BRASIL-SP BALSAMO \ DATA, 17/IX/87 \ SERINGUEIRA \ COL. BERGMANN, E. C. ”(Light brown) “352 \ AL”(Light brown) and same paratype label (CNCI); 1, “BRASIL-SP BALSAMO \ DATA, 21/IX/88 \ SERINGUEIRA \ COL. BERGMANN, E. C. ”(Light brown) “2783 \ BB”(Light brown) “ Sennius sp. 4 \ C.S. Ribeiro-Costa det. 1991”(Light brown) and same paratype label (DZUP).

Distribution. BRA (Ceará, Pernambuco, Goiás, Distrito Federal, Espírito Santo, São Paulo).

Host plant. FABACEAE : Caesalpinioideae : Senna obtusifolia (Sicklepod) .

Diagnosis. Sennius vivi sp. nov. (subgroup 1) is easily distinguished from all other species of the S. abbreviatus group by the color and the pattern of pubescence on the dorsum. The male genitalia is most similar to S. nappi (subgroup 1) in having hinge sclerites long and narrow and a group of spicules on the subapical region of similar size. Sennius vivi sp. nov. differs by the two groups of spicules on the basal region of the internal sac, which is slightly dense, with few shorter spicules, while in S. nappi the spicules of this group are denser and longer.

Etymology. The specific name “ vivi ” is in honor of Dra. Viviane Grenha, for her great professional and personal contribution in instructing J. H. Viana. This is a noun in apposition, gender feminine.

Figures

FIGURES 100 – 107. Sennius vivi sp. nov. 100, dorsal view; 101, lateral view; 102, head, frontal view; 103, pygidium; 104, part of hind leg, internal view; 105, hind tibia, external view; 106, 107 male genitalia: 106, median lobe with hinge sclerites, others sclerites magnified and latero-basal lobes of internal sac; 107, tegmen.