Sennius nappi Ribeiro-Costa and Reynaud 1998

Viana, Jéssica Herzog & Ribeiro-Costa, Cibele Stramare, 2013, Bruchines (Coleoptera: Chrysomelidae) associated with Senna neglecta (Vogel) H. S. Irwin and Barneby (Fabaceae: Caesalpinioideae): a new host plant for the subfamily, Journal of Natural History 48 (1 - 2), pp. 57-85 : 76-78

Sennius nappi Ribeiro-Costa and Reynaud 1998

( Figure 5 A–I)

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

Diagnosis

Dimension. Length (Pronotum–elytra) 1.80–2.84 mm. Width 1.08–1.72 mm.

Integument colour. Head black, labrum rarely lighter; first four segments of antenna red-orange, seventh to apical dark brown to black ( Figure 5B ). Prothorax, scutellum, pygidium and ventral region of the body black ( Figures 5A, B, D ). Black elytron with transverse submedian macula, irregular, red-orange to dark brown, extending from third or fourth to eighth or ninth striae interval, sometimes extending more darkly to apex region, elytra rarely without macula ( Figure 5A ). Anterior and middle legs black or dark brown apically; black hind legs ( Figure 5B ).

Pubescence. Head with dense tuft of white pubescence posterior to postocular lobe, moderately dense on postocular lobe and scattered on rest of head. Labrum with scattered golden pubescence, denser and forming a line near the apex ( Figure 5C ). Pronotum with brown and golden sparse pubescence and white pubescence denser in short oblique lateral bands, and usually in the antescutellar region ( Figure 5A ). Scutellum with dense white pubescence ( Figure 5A ). Elytron with moderately dense white pubescence forming a submedian transversal and irregular macula, extending from second or third to tenth striae interval, generally covering the orange-red macula on the integument; remainder of elytra with sparse brown pubescence ( Figure 5A ). Ventral surface with white pubescence denser at base of mesepimeron, at posterior margin of metepisternum, at distal region of hind coxa, and at base of first abdominal ventrite ( Figure 5B ). Pygidium with moderately dense white pubescence at the anterior midline, sometimes extending to the middle of pygidium ( Figure 5D ).

Head with coarse and dense punctuation except at midline of frons and labrum; frons slightly convex, transverse sulcus slightly evident; ocular sinus deep, more than half an eye length ( Figure 5C ). First to fourth segments of the antenna moniliform to filiform, fifth to tenth wider than long, eleventh globular and pointed apically ( Figure 5B ). Pronotum moderately convex ( Figure 5B ), disc sulcate at basal lobe ( Figure 5A ). Scutellum subquadrate, slightly wider than long ( Figure 5A ). Base of second and third striae of elytron with denticles ( Figure 5E ). Hind femur on ventral margin with a slightly prominent microserrate tooth (0.01–0.06 mm) ( Figure 5F ). Hind tibia with lateroventral carina that extends more than half of its length ( Figure 5G ), lateral, dorsomesal and ventral carinae long, ending near coronal denticles ( Figure 5F, G ); mucro short, about 1.3 times the opposite coronal denticle ( Figure 5F, G ). Last abdominal ventrite of male emarginate at middle, rounded in female. Pygidium not concealed by elytra, subtriangular, lateral margins slightly curved, apex rounded in male, more acuminate in female ( Figure 5B, D ).

Male genitalia. Median lobe about five times longer than its width at median region, apex slightly expanded; ventral valve with rounded projection apically, lateral margins convex; hinge sclerites moderately curved, expanded at base and apex. Trilobate internal sac, without spicules at basal region near base of valve, submedian region with dense group of short spicules apparently forming three longitudinal clusters; laterals of subapical region of internal sac with two clusters of large spicules; apical region with spicules on lateral lobes and denticles on middle lobe near the gonopore ( Figure 5H ). Tegmen with lateral lobes separated by deep emargination, about 0.7 times the length of lateral lobes ( Figure 5I ).

Type material

Holotype, allotype and paratypes of Sennius nappi deposited in DZUP with the labels: “Curitiba-PR | 22-XI-95 | Ribeiro-Costa,” “Host | Senna | multijuga ”. For the recognition of Sennius nappi , the type material of Sennius transversesignatus was studied.

Additional specimens

BRAZIL: Mato Grosso: Pirizal: Faz. Retiro Novo, Pantanal de Poconé , N. Sra. do Livramento, 28 / III / [20]04, L.D. Battirola col., in Vochysia divergens , 1 specimen ( DZUP) . Mato Grosso do Sul: Dourados : no date, A. Ferraz col., no host plant, 1 specimen ( DZUP) . Rio de Janeiro: Itatiaia : P.N. Itatiaia, 19 / VIII / 2008, M. Torres col., in Senna multijuga , 24 specimens ( DZUP) . Rio de Janeiro: X / 1957, M. Alvarenga col., no host plant, 1 specimen ( DZUP) . Teresópolis : P.N. Serra dos Órgãos, VI / 2006, J.H. Viana col., in Senna neglecta var. oligophylla , 4 specimens ( DZUP) ; VIII / 2006, same collector and host plant, 2 specimens ( DZUP) ; 22 / VIII / 2006, same collector and host plant, 29 specimens ( DZUP) ; 05 / IX / 2006, same collector and host plant, 18 specimens ( DZUP) ; 21 / IX / 2006, same collector and host plant, 1 specimen ( DZUP) ; 29 / IX / 2006, same collector and host plant, 2 specimens ( DZUP) ; 2007, same collector and host plant, 2 specimens ( DZUP) ; 02 / IV / 2007, same collector and host plant, 1 specimen ( DZUP) ; 15 / VIII / 2007, same collector and host plant, 6 specimens ( DZUP) ; 17 / VIII / 2007, same collector and host plant, 1 specimen ( DZUP) ; 29 / VIII / 2007, same collector and host plant, 1 specimen ( DZUP) ; 06 / IX / 2007, same collector and host plant, 1 specimen ( DZUP) ; 12 / IX / 2007, same collector and host plant, 6 specimens ( DZUP) ; 14 / IX / 2007, same collector and host plant, 4 specimens ( DZUP) ; 21 / IX / 2007, same collector and host plant, 1 specimen ( DZUP) ; 26 / IX / 2007, same collector and host plant, 1 specimen ( DZUP) ; 26 / IX / 2007, same collector and host plant, 1 specimen ( DZUP) . Paraná: Curitiba : 22 / XI / [19]95, C.S. Ribeiro-Costa col., in Senna multijuga , 9 specimens ( DZUP) ; Jardim Botânico , 04 / VIII / 1997, same collector and host plant, 3 specimens ( DZUP) ; 20 / XI / [20]00, L.T. Sari col., same host plant, 3 specimens ( DZUP) ; 26 / I / [20]01, same collector and host plant, 3 specimens ( DZUP) ; Ed. Física – UFPR, 15 / VII / [20]08, K.L. Azevedo col., in Senna neglecta var. neglecta , 3 specimens ( DZUP) . Jaguariaíva : 03 / X / [20]03, L.T. Sari col, in Senna rugosa , 1 specimen ( DZUP) ; 24 / X / [20]03, same collector and host plant, 1 specimen ( DZUP) ; 21 / X / [20]03, same collector and host plant, 1 specimen ( DZUP) . Londrina : 16 / IV / 2003, A. Menezes Jr. col., in Senna sp., 3 specimens ( DZUP) ; 10 / VI / 2002, same collector, in S enna occidentalis , 2 specimens ( DZUP) ; 22 / VIII / 2003, same collector, in S enna obtusifolia , 3 specimens ( DZUP) ; 14 / V / 2002, same collector, in S enna sp., 3 specimens ( DZUP) . No locality: no date and collector, 1 specimen ( DZUP) .

Distribution

Brazil (Paraná).

New record – Brazil (Mato Grosso, Mato Grosso do Sul, Rio de Janeiro)

Host plants

Fabaceae : Caesalpinioideae : Senna multijuga .

New records – Fabaceae : Caesalpinioideae : Senna neglecta var. oligophylla , S. neglecta var. neglecta , S. rugosa , S. occidentalis , S. obtusifolia .

Note. The plant listed in the additional specimens, Vochysia divergens , is not listed here because the adult collected was not reared on seeds of this plant, and only plants with record of larvae preying are quoted as host plant.

Discussion

Sennius nappi differs mainly by its pronotum with short oblique lateral bands of dense white pubescence, and elytron usually with an irregular transverse macula of white pubescence in the submedian region covering a reddish-orange macula that may extend, becoming darker, to the apex of the elytron. Sennius bondari and Sennius nappi likewise belong to the abbreviatus group of Sennius by sharing many characters mentioned in the “Discussion” section of Sennius bondari . However, Sennius nappi is placed in subgroup 1 and is more similar to Sennius transversesignatus , sharing two major clusters of spicules on each lateral lobe of the internal sac of the male genitalia (a characteristic of subgroup 1) and a black integument, except for a reddish-orange transverse macula on each elytron covered with white pubescence, which can make identification difficult. In Sennius nappi , the last seven antenna segments are dark brown to black, and there are no tufts of white pubescence near the base of the elytron, whereas in Sennius transversesignatus all segments are usually light brown and tufts of white pubescence are present. In terms of the male genitalia, Sennius nappi has lateral clusters of large spicules in the subapical region of the internal sac, whereas in Sennius transversesignatus these clusters are in the median region. Moreover, Sennius nappi does not have two moderately dense clusters of large spicules in the apical region of the middle lobe of the internal sac, as in Sennius transversesignatus .

Figures

Figure 5. Sennius nappi. (A) Dorsal view; (B) lateral view; (C) head, frontal view; (D) pygidium; (E) base of elytra striae; (F) part of hind leg, internal view; (G) hind tibia, external view; (H, I) male genitalia: (H) median lobe with hinge sclerites and others sclerites in internal sac magnified; (I) lateral lobes.