Sennius lojaensis (Pic, 1933)

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 : 520-521

Sennius lojaensis (Pic, 1933)

( Figs 55–62 )

Bruchus lojaensis Pic, 1933: 15 (description, distribution); Bondar 1937: 42 (host, description) Acanthoscelides lojaensis: Blackwelder 1946: 760 (catalog); Silva et. al. 1968: 374 (host, distribution); Udayagiri & Wadhi 1989: 50 (catalog).

Sennius lojaensis: Kingsolver & Silva 1991: 412 .

Redescription. Dimension. BL: 1.5–2.3 mm; BW: 1.0–1.5 mm.

Integument color. Body black, except antennomeres 1–4 or 5, tibiae, fore and mid tarsus red-orange; antennomeres 5 or 6–11 dark brown ( Figs 55–57 ). Fore and mid femur red-orange to dark brown; hind leg dark brown to black ( Fig. 56 ).

Pubescence. Head with moderately dense white setae except for small dense patch posterior to post-ocular lobe; labrum with scattered golden setae ( Fig. 57 ). Pronotum with white setae denser on median line and on lateral third of basal region. Scutellum with dense white setae. Elytra with scattered golden and black setae, white setae distributed as follows: moderately dense on 1st strial interval; median and subapical region of 2nd strial interval; median region of 3rd and 4th interstices and forming horizontal and irregular strip on submedian region from 5th to 11th interstices ( Fig. 55 ). Ventral surface with moderately dense white setae, denser at base of mesepimerum and on posterior region of metepisternum ( Fig. 56 ). Pygidium with white setae denser at base and on part of median line, remainder with scattered golden setae ( Fig. 58 ).

Head with frons convex, frontal carina slightly evident and ocular sinus deep, about half length of eye ( Fig. 57 ). Antennomeres 1 and 3 filiform, 2 and 4 moniliform, 5–10 as long as wide, 11 globular but pointed apically. Disk of pronotum slightly sulcate at basal lobe. Elytra without denticle at base of strial. Hind femur on ventral margin with very prominent tooth (0.03–0.06 mm), microserrate ( Fig. 59 ). Hind tibia with lateroventral carina extending more than half its length ( Fig. 60 ).

Male genitalia. Median lobe strongly sclerotized, about 4.2 times longer than wide medially, apex strongly expanded. Ventral valve elongated with truncate apex and lateral margins sinuous. Internal sac with hinge sclerites long, moderately curved and thin; apical region without spicules; subapical region with short and moderately dense group of short spicules and two wide groups of long spicules; submedian region with dense group of spicules between base of latero-basal lobes; latero-basal lobes of internal sac with dense and long spicules; basal region with denticules not denser near gonopore ( Fig. 61 ). Tegmen with lateral lobes separated by emargination about 0.8 times their length ( Fig. 62 ).

Material examined. Type (1 Homotype): Bruchus lojaensis Pic, 1933 . The type is deposited in the MNHN with labels: “Loja \ Ecuador ” “ type ” “ lojaensis \ in litt.”, but it was not possible to examine. The recognition of this species was based on drawings and notes made by Kingsolver when he studied the material from the MNHN, and the homotype determined by him in 1976 and deposited in the USNM with label: “Horto flor \ (T.C.) S. Paulo \ 17.IX.1959 \ F. halik. \ 13140”.

Non-type (60): BRA: Minas Gerais: Viçosa : 1, 1 /V/[19]33, E. J. Hambleton (DZUP). Rio de Janeiro: Itatiaia : 1, P. N. Itatiaia , VI/1954, H. Geuveis (MNRJ). Resende: 4, APA S. do Alambari, 19/VIII/2008, M. Torres, Senna multijuga (DZUP). Paraná: Curitiba : 1, Jardim botânico, 22/VI/1993, L. C. Haenle, Senna multijuga (DZUP); 1, 05 /VIII/1998, same collector and host plant (DZUP); 1, 17 /VIII/1998, same collector and host plant (DZUP); 1, 03 /VII/1999, same collector and host plant (DZUP); 6, 19 /X/2000, L. T. Sari, same host plant (DZUP); 29, 1º/ XI/2000, same collector and host plant (DZUP); 11, 11 /XI/2000, same collector and host plant (DZUP); 1, 20 /XI/2000, same collector and host plant (DZUP); 2, Jardim Botânico, 26/I/2001, same collector and host plant (DZUP). Jundiaí do Sul: 1, Fazenda Monte Verde, 27/X/1986, Lev. Ent. Profaupar MALAISE (DZUP).

Distribution. BRA (Bahia). New record —BRA (Minas Gerais, Rio de Janeiro, São Paulo, Paraná).

Host Plant. New record — FABACEAE : Caesalpinioideae : Senna multijuga .

Diagnosis. Sennius lojaensis (subgroup 1) externally resembles S. bondari and S. leucostauros (subgroup 3) and specimens with black elytra of S. nappi (subgroup 1). All four species have a horizontal strip of white setae on the submedian region of the elytra. Sennius lojaensis differs from the other three by having a vertical strip of setae on the mid-apical region that reaches the submedian horizontal strip mentioned above. The male genitalia of S. lojaensis resembles that of S. nappi , however at the subapical region of the internal sac has larger dense groups of spicules similar to an open hand fan, whereas in S. nappi the spicules are aligned side by side.

Figures

FIGURES 55 – 62. Sennius lojaensis. 55, dorsal view; 56, lateral view; 57, head, frontal view; 58, pygidium; 59, part of hind leg, internal view; 60, hind tibia, external view; 61, 62 male genitalia: 61, median lobe with hinge sclerites, others sclerites magnified and latero-basal lobes of internal sac; 62, tegmen.