Decellebruchus atrolineatus (Pic, 1921) Pic, 1921

Napoles, Jesus Romero, 2016, Systematics of the seed beetle genus Decellebruchus Borowiec, 1987 (Coleoptera, Bruchidae), ZooKeys 579, pp. 59-81 : 63-64

Taxon classification Animalia Coleoptera Bruchidae

Decellebruchus atrolineatus (Pic, 1921) comb. n.

Bruchus atrolineatus Pic, 1921: 15, 1932: 36; Decelle 1951: 184, 1961: 8, 1975a: 21 (comb. n.).

Bruchidius atrolineatus : Prevett 1961: 636, 1967: 5, 1971: 247; Booker 1967: 2; Luca 1968a: 188, 1968b: 589; Decelle 1975a: 15; Southgate 1978: 219; Biemont et al. 1982: 2610; Hamon et al. 1982: 327; Pfaffenberger 1985: 3; Germain et al. 1987: 157; Monge et al. 1988: 297, 1989: 95; Huignard et al. 1989: 197; Pouzat and Nammour 1989: 319; Udayagiri and Wadhi 1989: 119; Lenga et al. 1990: 79; Glitho and Huignard 1990: 195; Pfaffenberger and Monge 1991: 309; Pichard et al. 1991: 185; Shimada and Ishihara 1991: 289; Credland 1992: 1; Ishihara and Shimada 1995: 127; Ofuya and Credland 1996: 323; Kingsolver 1988; Sanon et al. 2005; Löbl and Smetana 2010: 341.

Callosobruchus atrolineatus : Zacher 1952: 465; Shomar 1963: 178.

Bruchus semiflabellatus Pic, 1931; Bondar 1936: 37 (syn.); Kingsolver and Silva 1991: 413 (syn.); Udayagiri and Wadhi 1989: 119.

Acanthoscelides semiflabellatus : Blackwelder 1946: 761.

Callosobruchus semiflabellatus : Zacher 1952: 465.

Decellebruchus atrolineatus : Anton 1994: 100; Kergoat et al. 2005: 605 (without indicating clearly new combination).

Description.

Male (Fig. 1 a–b). Length (pronotum-elytra): 2.4-2.6 mm; width: 1.4-1.6 mm; maximum thoracic depth 1.5-1.7 mm. Color: Antennae with the first three segments yellowish, the rest dark or partially dark; head, prosternum, metasternum, base of meso-femur and meta-femora, and coxae dark; pronotum with two longitudinal dark bands, which may together form a dark spot; elyton variegate; pygidium with three pairs of dark spots, two apical, two median-lateral, and two basal; rest of body yellowish. Vestiture: Body with mixed yellowish and white pubescence; scutellum with whitish pubescence; fore coxa with a tuft of white setae; pygidium with yellowish and whitish pubescence forming a variegate pattern. Head: Short and broad, densely micropunctulate, frons with a strong median carina, distance between eyes 2.3. –3.3× as wide as eye width, eye cleft 0.60 –0.71× its length by ocular sinus, posterior margin of eye protruding from adjacent surfaces, postocular lobe rounded and setose; distance from base of antennae to apex of labrum 0.39 –0.55× as long as distance from upper limits of eyes to apex of labrum; antennomeres I–III filiform, IV subserrate, V–XI pectinate; antennomere II 2.8 –3.8× as long as antennomere XI; antennomere VII 4.4 –5.6× wider that long; antenna extending slightly beyond humerus. Prothorax: Subconical, without lateral carina; densely foveolate, disc convex, slightly gibbous before scutellum and with shallow median channel; prosternal process narrow, triangular, acute, half as long as procoxae. Meso- and metathorax: Scutellum square, bidentate apically; elytral striae regular, striae 4 and 5 abbreviated basally by tubercle, humeri raised. Legs: First protarsomere 2.0 –3.0× as long as second, first mesotarsomere 1.8 –2.3× as long as second, first metatarsomere 2.6 –3.0× as long as second; metacoxa densely punctate; hind femur constricted basally and apically, expanded medially to about width of coxa; without external carina ventrally; internal ventral carina with small subapical acuminate spine about half as long as width of tibial base; hind tibia straight, enlarged, with only mesal and ventral carinae; tibial corona with 4 spinules, mucro 0.10 –0.13× as long as first tarsomere; without sinus at base of spine; first hind tarsomere with ventrolateral glabrous longitudinal carina. Abdomen: Pygidium vertical (Fig. 2); last sternite emarginate. Genitalia: Median lobe moderately long, ventral valve triangular and deeply arcuate, internal sac with many small spines or needles, without large sclerites (Fig. 3a); lateral lobes elongate, expanded at apex, cleft about 0.53 their length; basal strut an obsolete perpendicular keel (Fig. 3b). Female (Fig. 4 a–b). Length (pronotum-elytra) 2.4-2.8 mm, width: 1.5-1.7 mm, Maximum thoracic depth 1.6-1.8 mm. Similar to male except antennae serrate; distance between eyes 1.8. –2.0× as wide as eye width; pygidium subvertical; last sternite not emarginate.

Material examined.

NAMIBIA: Rundu, 28/V/2015, T. Chauke, 17°55'S 19°46'E, reared seed Glycine max (L.), intercepted at Pretoria SAAFQIS Plant Quarantine Station, South Africa, Sample Pta. 2811 (1 ex SANC). Caprivi region, 2002, intercepted at Pretoria SAAFQIS Plant Quarantine Station, South Africa (70 ex SANC). AFRICA: Intercepted at USA, 36/ XII/2003, reared seed Phaseolus sp. (3 ex, FSCA); Intercepted at Atlanta, USA, 10/IX/2006, reared seed Phaseolus vulgaris L. (1 ex., FSCA). DEMOCRATIC REPUBLIC OF THE CONGO: N of Shaba Province, 28/III/1980, Whitecomb W.H., in cowpeas (1 ex., FSCA). NIGERIA: Intercepted at USA, 2/II/2004, Phaseolus sp. (7 ex., FSCA); Intercepted at USA, 3/II/2004, reared seed Phaseolus sp. (2 ex., CEAM). MEXICO: Ocolome, El Fuerte, Sinaloa, 21/I/2013, Lugo G.G.A., reared seed Vigna unguiculata (L.) WALP. (190 ex., CEAM).

Host plants.

Dolichos lablab L., Glycine max (L.), Phaseolus vulgaris L. Vigna unguiculata (L.) Walp., Vigna unguiculata subsp. stenophylla (Harv.) Maréchal & Al., Vigna unguiculata subsp. unguiculata (L.)Walp. ( Fabaceae ). Zacher (1952) stated that Lablab niger Medik. and Medicago sativa L. are plant hosts of Decellebruchus atrolineatus , however this information must be corroborated.

Distribution.

Algeria, Angola, Brazil, Burkina Faso, Cameroon, Central African Republic, Democratic Republic of the Congo, Egypt, Ethiopia, Gambia, Ghana, Jamaica, Kenya, Liberia, Mali, Mexico, Mozambique, Namibia, Niger, Nigeria, South Africa, Saudi Arabia, Senegal, Sudan, Tanzania, Uganda, United Kingdom, Yemen, Zanzibar.

Discussion.

Decellebruchus atrolineatus has high economic importance, because it is a pest mainly in species in the genus Vigna . It is frequently found together with Callosobruchus maculatus (F.). Large losses due to this insect are reported frequently in some countries of Africa, where those bruchids are endemic ( Booker 1967, Germain et al. 1987, Ofuya and Credland 1996, Sanon et al. 2005).