Bruchidius tanaensis (Pic) Pic, 2015

Delobel, Alex, Ru, Bruno Le, Genson, Gwenaëlle, Musyoka, Boaz K. & Kergoat, Gael J., 2015, Molecular phylogenetics, systematics and host-plant associations of the Bruchidius albosparsus (Fåhraeus) species group (Coleoptera, Chrysomelidae, Bruchinae) with the description of four new species, Zootaxa 3931 (4), pp. 451-482 : 472-473

Bruchidius tanaensis (Pic) comb. nov.

Bruchus tanaensis Pic, 1921

Material examined. Holotype (male) of Bruchus tanaensis : Kenya: " TYPE " [red], " type " [Pic's handwriting], " Tana River / B.E.A.", "G. Babault / juin 1915 " "Genit. ♂ / Br. Pic.55 (not recovered)" " Bruchus tanaensis Pic " [unidentified handwriting], "Muséum Paris / Coll. M. Pic", " Bruchus / tanaensis Pic " [Decelle's handwriting]; this specimen lacks right elytron and hind femur [ MNHN]. Allotype (female): Kenya: " Tana River / B.E.A.", "G. Babault / mai 1915 ", "Muséum Paris / 1930 / Coll. G. Babault", " TYPE " [red], Bruchus / tanaensis / n. sp." [Pic's handwriting], "Muséum Paris / Coll. M. Pic", " Bruchus / tanaensis Pic " [Decelle's handwriting] [ MNHN].

Other material: Kenya: 4♂ 12♀, Kabarak, 00°10’26’’S 35°58’21’’E, 1910m, 18.vi. juin 2007, ex Vachellia seyal [1♂ 17207, specimen GK104 used for DNA extraction] (B. Le Ru) [ CBAD, CBGP]; 1♂ 5♀, Kapenguria, 01°18’44’’S 35°13’07’’E, 1894m, vii.2002, ex V. hockii [♂ 0 4203, ♀ 0 2514, specimen GK357 used for DNA extraction] (B. Le Ru) [ CBAD, CBGP]; 2♂ 4♀, Machakos, 01°13’13’’S 37°26’24’’E, 1665m, 23.i.2008, ex V. seyal [2♂ 0 8308, 0 2211, specimen GK385 used for DNA extraction] (B. Le Ru) [ CBAD, CBGP]; 4♂ 5♀, Masii, 01°24’27’’S 37°29’53’’E, 1319m, vi.2002, ex V. hockii [1♂ 0 5503, specimen K213 used for DNA extraction] (B. Le Ru) [ CBAD, CBGP]; Oltepesi, 01°32’30’’S 36°33’07’’E, 1665m, v.2002, ex V. nubica [specimen K313 used for DNA extraction] (B. Le Ru) [ CBGP]; Rongai, 00°11’56’’S 35°50’06’’E, 2104m, ix.2002, ex Senegalia mellifera mellifera [1♂ 14902] (B. Le Ru) [ CBAD]. Republic of South Africa: 1♂, Natal, Weenen (2840 ft), viii–ix.1823 [1♂ 06209] (H.P. Thomasset) [ MNHN], 1♀, same data but i–ii.1826, with label “ Bruchus spadiceus / J. Decelle det. 1965” (H.P. Thomasset) [ MNHN].

A medium-sized (2.7–2.8 mm) species with body short and ovate, integument reddish-brown, antennae (except central segments), fore and middle legs yellowish red. A black spot on frons, antennal segments 7–10 brownishblack, apical segment usually markedly lighter than preceding ones, thoracic sternites partly black. On elytra, posterior 2/3 of 1st and 2nd interstriae darkened (sometimes dark area extended into an oval spot), humeral callus black. Last visible tergite reddish-brown with disc more or less blackened in females. Vestiture mainly white and yellowish, not completely covering integument, recumbent; on pronotum, a longitudinal strip opposite scutellum, reaching to 1st third of pronotum length, two very small spots about middle of disc, and sides, white; scutellum white; on elytra, white linear spots on interstriae 3, 5, 7, 9, separated by strips of blackish setae. On remaining interstriae, vestiture mainly yellowish. A black spot on suture between basal third and apical fourth. Upper parts of thoracic sternites with dense white setation. Elytra with shallow protuberance bearing two small teeth at base of striae 3 and 4. Ventrite 1 with large basal circular area of thin, semi-erect setae. Female last visible tergite with disc black, slightly heart-shaped, about as long as wide, strongly convex medially in apical 2/3.

Genitalia ( Figs. 23–24 ). Median lobe moderately stout (w/l = 0.17); ventral valve subtriangular, moderately sclerotized, with acute tip, bearing numerous sensilla and on each side a row of 3 to 4 setae; hinge sclerites large, subrectangular to subtriangular, strongly sclerotized; internal sac proximally with a few sensilla, saccus densely lined with setae and spicules and a group of small translucent spines. Basal strut without keel. Lateral lobes cleft to about two thirds of their length; apex of parameres with numerous long setae. In female, vagina long and membranous, no sclerite at entrance of bursa copulatrix.

Biology. Material from Kenya was reared from seeds of several species of Mimosoideae : Senegalia mellifera mellifera (Vahl) Seigler & Ebinger , V. hockii , V. nubica (Benth.) Kyal. & Boatwr. and V. seyal .

Discussion. The genitalia of the male holotype are presumed lost. The identity of types is assumed mainly on the basis of antennal color, with segments 7–10 markedly blackened as in specimens listed here, strongly sclerotized hinge sclerites, and saccus with moderately strong spines.

Distribution. Democratic Republic of Congo ( Decelle 1951, 1958), Kenya, and Republic of South Africa.

Figures

FIGURES 20 – 24. Bruchidius ishwaensis (male): 20 — median lobe (ventral view); 21 — lateral lobes (ventral view); Bruchidius ishwaensis (female): 22 — spermatheca (lateral view); Bruchidius tanaensis (male): 23 — median lobe (ventral view); 24 — lateral lobes (ventral view).