Sennius trinotaticollis (Pic, 1930)

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 : 529-530

Sennius trinotaticollis (Pic, 1930)

( Figs 92–99 )

Bruchus trinotaticollis Pic, 1930: 11 (description, distribution).

Acanthoscelides trinotaticollis: Blackwelder 1946: 761 (catalog).

Sennius trinotaticollis: Johnson & Kingsolver 1973: 96 (description, key, figures, type designation, taxonomy, distribution); Johnson 1977: 131 (distribution, host); Johnson & Kingsolver 1981: 419 (catalog, distribution); Udayagiri & Wadhi 1989: 107 (catalog); Romero-Nápoles & Johnson 2004: 627 (list); Pikart et. al. 2011: 378, 379 (distribution, host).

Redescription. Dimension. BL: 1.8–2.4 mm; BW: 1.5–1.7 mm.

Integument color. Head black with small red-orange post-ocular macula, labrum red-orange; all antennomeres generally red-orange, sometimes 6–11 pale brown ( Figs 93, 94 ). Elytra brown, each with horizontal red-orange strip on basal third, except humerus, occupying part of 4th to 11th interstices, 1st to 3rd interstices brown to dark brown, sometimes subapical pale brown macula occupying part of 4th to 9th interstices ( Fig. 92 ). Prothorax generally black, sometimes brown. Basal half of pygidium red-orange, apical half brown to dark brown, sometimes pygidium completely brown ( Fig. 95 ).Ventral region pale brown to black ( Fig. 93 ). Legs generally red-orange, sometimes pale brown ( Fig. 93 ).

Pubescence. Head with white setae in post-ocular lobe, small dense white patch posterior in the post-ocular lobe ( Figs 93, 94 ), remainder with sparse white setae. Pronotum generally with three patch of dense white and golden setae at base, remainder with sparse golden setae. Elytra with sparse brown setae with dense white setae in 1st strial interval, anterior region of 2nd strial interval, median region of 3rd strial interval, and forming horizontal strip on anterior region of 4th to 9th interstices and, at base of 2nd and 3rd interstices, sometimes with patch apically ( Fig. 92 ). Ventral surface with dense white setae ( Fig. 93 ). Pygidium generally with dense white setae on laterobasal region and on basal half, extending on midline up to center of pygidium, remainder with brown and white setae ( Fig. 95 )

Head with frons convex, frontal carina present and ocular sinus deep, more than half length of eye ( Fig. 94 ). 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 (0.07–0.13 mm), microserrate ( Fig. 96 ); hind tibia with lateroventral carina extending half its length ( Fig. 97 ).

Male genitalia. Median lobe strongly sclerotized, about 4.5 times longer than wide medially, apex strongly expanded. Ventral valve rounded with round apex and lateral margins convex. Internal sac with hinge sclerites long, slightly curved and thin; apical region with group of spicules near ventral valve; subapical region with dense group of spicules; submedian region continuing with part of the subapical group of spicules and with sparse circular sclerites; latero-basal lobes of internal sac with dense and long spicules; basal region with dense denticles throughout ( Fig. 98 ). Tegmen with lateral lobes separated by emargination about 0.7 times their length ( Fig. 99 ).

Material examined. Type (1 Homotype): Bruchus trinotaticollis Pic, 1930 . The type is deposited in MNHN, with locality “ Costa Rica ” and it was not possible to study it. The recognition of this species was based on Johnson & Kingsolver (1973), drawings and notes made by Kingsolver when he studied the material from MNHN, and the homotype determined by him in 1971 and deposited at MNHN, with labels: “ Brazil \ Bahia \ 1929 \ Dr. G Bondar. \ On wild \ Leguminous \ plant. \ 349”(Yellow) [Three labels not readable](Yellow) “Homotype \ trinotaticollis \ det. 71 Pic \ J. M. Kingsolver”(White) “ Sennius \ trinotati - \ collis \ det. 71 Pic \ J. M. Kingsolver”(White).

Non-type (32): CRC: Guanacaste: Santa Rosa N. Park: 3, 10 /III/1979, D. H. Janzen (USNM). PAN: Colón: Gamboa : 17, 24 /II/1964, L. J. Bottimer, Cassia maxonii (7, CNCI; 10, TAMU). Elhlano: 10, 4 Km W Elhlano, 3/ IV /[19]80, C. D. Johnson, Senna hayesiana (TAMU). BRA: Minas Gerais: Viçosa : 10, 2009, T. G. Pikart, Senna macranthera (DZUP). São Paulo: Campinas: 2, 12–17 /VII/1987, Senna sp. (DZUP).

Distribution. MEX (Tabasco), GUA (Izabal), CRC (Guanacaste), PAN (Colon), TRI, VEN, COL, BRA (Minas Gerais). New record —BRA (São Paulo).

Host plants. FABACEAE : Caesalpinioideae : Senna hayesiana (syn for Cassia maxonii ), S. oxyphylla (Kunth) Irwin & Barneby, S. macranthera.

Diagnosis. Sennius trinotaticollis (subgroup 3) is more similar to S. lebasi (subgroup 3) considering the integument color, pubescenceof elytra and male genitalia. Sennius trinotaticollis has the hinge sclerites longer and less curved than those found in S. lebasi . Furthermore, in S. trinotaticollis the basal region of the internal sac has the groups of large spicules less defined than those of S. lebasi .

Figures

FIGURES 92 – 99. Sennius trinotaticollis. 92, dorsal view; 93, lateral view; 94, head, frontal view; 95, pygidium; 96, part of hind leg, internal view; 97, hind tibia, external view; 98, 99 male genitalia: 98, median lobe with hinge sclerites, others sclerites magnified and latero-basal lobes of internal sac; 99, tegmen.