Acanthoscelides multimaculatus Viana & Ribeiro-Costa 2013, sp. nov.
Creators: name: Viana, Jéssica Herzog
name: Ribeiro-Costa, Cibele Stramare
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Chrysomelidae
Acanthoscelides
Acanthoscelides multimaculatus

description: Acanthoscelides multimaculatus sp. nov.
(Figure 1 A–I)
Description
Dimension. Length (Pronotum-elytra) 2.32–2.96 mm. Width 1.48–1.92 mm.
Integument colour. Head, thorax and abdomen dark brown to black (Figure 1B). Antenna dark brown or with the first four segments light brown (Figure 1B, C). Maxillary and labial palps black (Figure 1C). Elytron dark brown with light brown oblique macula on the basal half, from base of the fourth to seventh striae intervals until second to fifth striae intervals in the median region; additional macula at part of the posterior margin in the apical region (Figure 1A). Pygidium light brown to black (Figure 1D). Legs light brown, except middle coxa and basal two-thirds of hind femur dark brown, and tarsus red-orange (Figure 1B).
Pubescence. Head with dense tuft of white hairs posterior to postocular lobe (Figure 1C). Ocular sinus, postocular lobe, and mandibles with moderately dense white pubescence (Figure 1C). Labrum aligned with golden pubescence near the base and apex (Figure 1C). Pronotum with sparse pubescence and small tufts of intermixed white with golden pubescence at base and lateral thirds of apex and at antescutellar region (Figure 1A). Scutellum with sparse white pubescence (Figure 1A). Elytron with white pubescence strongly dense only in a short band at submedian region of third striae interval, remaining portions with white and golden pubescence moderately dense, distributed as follows: macula elongate and oblique at the anterior half that covers part of the striae intervals fourth to seventh; on small, short and slightly oblique band at the submedian region that covers part of the seventh to ninth striae intervals; on broad and irregular macula in the posterior half that covers the second to ninth striae intervals; remaining elytron with golden pubescence (Figure 1A). Pygidium with white and golden sparse pubescence; dense white pubescence at middle, and moderately dense in basal region, lateroanterior areas and median line (Figure 1D). Ventral surface with white pubescence denser at the base of mesepimeron, metepisternum, and tufts on the lateral areas of the abdominal ventrites (Figure 1B).
Head evenly punctuate, except in the midline of frons with only fine punctuation, apex of clypeus and labrum smooth; frons convex, frontal carina and transverse sulcus absent; ocular sinus deep, more than two-thirds eye length; postocular lobe narrow (Figure 1C). First and third antenna segments filiform, second and fourth moniliform, fifth to tenth wider than long, and eleventh globular with pointed apex. Pronotum moderately convex; disc slightly sulcate at basal lobe (Figure 1A). Scutellum subquadrate, slightly wider than long (Figure 1A). Striae third and fourth at base with denticles (Figure 1E). Hind femur with two small teeth (0.02–0.04 mm), and one more prominent (0.06–0.10 mm) with wide base on the ventral margin, near the apex (Figure 1F). Hind tibia with lateroventral carina (Figure 1G – LVC) extending more than half of its length; lateral (Figure 1G – LC), dorsomesal (Figure 1F – DMC) and ventral (Figure 1G – VC) carinae long, ending near coronal denticles; mucro (Figure 1F – M) 2.5 times longer than the opposite coronal denticle. Last abdominal ventrite of male emarginate at middle, rounded in female. Pygidium not concealed by elytra, lateral margins slightly curved, with apex rounded in male, more acuminate in female (Figures 1B, D).
Male genitalia. Median lobe about 4.3 times longer than its width in median region, expanded at the apex; ventral valve rounded, with convex lateral margins. Internal sac not apically lobed, basal region without spicules near the base of ventral valve; median region with wide sclerite in the form of an inverted “V”, with microserrate margin at apex and flanked by two pairs of sclerites, the anterior being long and thin and pointed at apex, nearly as long as the “V” sclerite, posterior sclerites short, with wide bases similar to teeth (Figure 1H). Tegmen with lateral lobes separated by deep emargination, about 0.63 times the length of lateral lobes (Figure 1I).
Type material
Holotype, allotype and 10 paratypes deposited in DZUP with labels: “ Brasil, RJ – Teresópolis | P.N. Serra dos Órgãos | 22 / VIII / 2006 | J.H. Viana col.” “Em | Senna neglecta | var. oligophylla ”. Five paratypes with the same label as the holotype deposited at each of the following museums: MZSP, MNRJ, TAMU, USNM, FSCA, CEAM and CNCI.
Additional specimens
BRAZIL: Rio de Janeiro: Teresópolis: P.N. Serra dos Órgãos, VII / 2006, J.H. Viana col., in Senna neglecta var. oligophylla, 48 specimens (DZUP); 22 / VIII / 2006, same collector and host plant, 19 specimens (DZUP); 05 / IX / 2006, same collector and host plant, 97 specimens (DZUP); 21 / IX / 2006, same collector and host plant, 15 specimens (DZUP); 22 / VIII / 2007, same collector and host plant, 1 specimen (DZUP); 06 / IX / 2007, same collector and host plant, 8 specimens (DZUP); 12 / IX / 2007, same collector and host plant, 7 specimens (DZUP); 14 / IX / 2007, same collector and host plant, 3 specimens (DZUP); 21 / IX / 2007, same collector and host plant, 6 specimens (DZUP); 25 / X / 2007, same collector and host plant, 1 specimen (DZUP). Mato Grosso do Sul: Campo Grande: 16 / VIII / [19]87, F. Giacomel col., no host plant, 21 specimens (DZUP). Paraná: Curitiba: 9 / VII / 1997, C.S. Ribeiro-Costa col., Senna neglecta var. neglecta, 3 specimens (DZUP); 28 / VII / 1997, same collector and no host plant, 1 specimen (DZUP); 20 / IX / 2001, E. Caron col., no host plant, 2 specimens (DZUP); 28 / IX / 2001, same collector and no host plant, 2 specimens (DZUP); 02 / X / 2001, same collector and no host plant, 3 specimens (DZUP); 05 / X / 2001, same collector and no host plant, 1 specimen (DZUP); 10 / X / 2001, same collector and no host plant, 2 specimens (DZUP); 11 / X / 2001, same collector and no host plant, 2 specimens (DZUP); 12 / X / 2001, same collector and no host plant, 2 specimens (DZUP); 15 / X / 2001, same collector and no host plant, 5 specimens (DZUP); 26 / X / 2001, same collector and no host plant, 1 specimen (DZUP); 04 / XI / 2001, same collector and no host plant, 1 specimen (DZUP). Londrina: 10 / VI / 2002, A. Menezes Jr. col., Senna occidentalis, 2 specimens (DZUP). No locality: no date or collector, 1 specimen (DZUP).
Distribution
Brazil (Rio de Janeiro, Mato Grosso do Sul, and Paraná).
Host plants
Fabaceae: Caesalpinioideae: Senna neglecta var. oligophylla, S. neglecta var. neglecta, S. occidentalis.
Discussion
This species differs from others found on Senna neglecta seeds mainly by the light pubescence on dark integument forming a variegated pattern on almost the entire elytra (Figure 1A), by the presence of a prominent tooth and two smaller teeth at the inner margin of hind femur (Figure 1F), and absence of hinge sclerites in the median lobe of the male genitalia, which are diagnostic for Sennius species (Figure 3H – HS).
Acanthoscelides multimaculatus sp. nov. belongs to the quadridentatus group of Acanthoscelides established by Kingsolver (1980) along with 15 other species by sharing with them similar pattern of the male genitalia. The species are A. devriesi Kingsolver 1980, A. difficilis (Sharp, 1885), A. equivocada Johnson 1990, A. laicus (Fahraeus 1839), A. machala Johnson 1990, A. mimosicola Johnson 1983, A. pectoralis (Horn 1873), A. pigricola Kingsolver 1980, A. puniceus Johnson 1983, A. quadridentatus (Schaeffer 1907), A. ramirezi Johnson 1990, A. tridenticulatus Bottimer 1969, A. triumfettae Kingsolver 1980, A. zebratus Kingsolver 1980 and A. zulia Johnson 1990. Of these species, 11 feed exclusively on the genus Mimosa Linnaeus (Fabaceae; Mimosoideae), one (A. pectoralis) is associated with Desmanthus Willdenow (Fabaceae: Mimosoideae) and one other (A. triumfettae) with Triumfetta Linnaeus (Malvaceae), however A. laicus, A. machala and A. multimaculatus sp. nov. feed on Senna (Fabaceae: Caesalpinioideae).
Acanthoscelides multimaculatus sp. nov. seems more similar to A. machala by the five sclerites of the internal sac of the male genitalia The differences between them rely mainly on the margin of sclerite shaped like an inverted “V” in the male genitalia, which is microserrate in A. multimaculatus sp. nov. and strongly serrate in A. machala (Johnson 1990, figs 299–303, p. 572).
Etymology
The specific name “ multimaculatus ” is related to the variegated pubescence pattern on dorsum.
description: Published as part of 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, pp. 57-85 in Journal of Natural History 48 (1 - 2) on pages 61-64, DOI: 10.1080/00222933.2013.791882, http://zenodo.org/record/4632079