Scymnus (Pullus) robustibasalis Yu 2000, new species
Creators: name: Yu, Guoyue
name: Montgomery, Michael E.
name: Yao, Defu
Publisher: name: Zenodo
Year: 2000
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Coccinellidae
Scymnus
Scymnus robustibasalis

description: <i>Scymnus</i> (<i>Pullus</i>) <i>robustibasalis</i> Yu, new species (Fig. 17) <b>Description.</b> Male. Length 1.65 mm, width 1.00 mm. Form oval with sides nearly parallel at middle, dorsum moderately convex. Head reddish brown. Pronotum dark brown with anterior corners reddish brown for 1/2 pronotal length, border between colors indistinct. Scutellum black. Elytra black with apical 1/10 reddish brown, border between colors indistinct. Underside black with lateral areas of prothorax and abdomen reddish brown. Legs yellowish brown with middle and hind coxae black. Interocular distance slightly less than 1/2 head width. Innerocular margins arcuate. Frons convex with very fine, dense punctation. Antenna 11­segmented, proportions as illustrated (Fig. 17i). Maxillary palpus terminal segment nearly parallel­sided, slightly convergent anteriorly, length about 1.3 times width, distal side distinctly oblique. Pronotum punctation similar to head. Elytral punctation coarser, pubescence arranged in very weak S­form. Prosternal carinae widely separated at base, anterior 1/2 distinctly convergent. Postcoxal line of first abdominal sternite truncate, complete, extending about 3/4 sternite length; enclosed area finely punctate except posterior 1/3 smooth. Fifth abdominal sternite hind margin shallowly, broadly incurvate; sixth sternite with sublateral setae longest, apex deeply incurvate. Genitalia: Sipho (Fig. 17a) relatively stout, basal 1/3 arcuate; siphonal capsule stout, with curved inner process, indistinct outer process; siphonal preapex with fin­shaped membrane, apex surrounded by membrane with 2 very slender sclerites (Fig. 17h). Tegmen (Fig. 17b, c) stout; median piece of tegmen nearly parallel­sided at middle half, converging gradually to teat­shaped tip, in ventral aspect. In lateral aspect, median piece thickest at base, narrowing to sharp tip. Lateral lobes of tegmen distinctly shorter than median piece. <b>Distribution.</b> China (Yunnan). <b>Type Series.</b> Holotype: (Ƌ), Yunnan: Lijiang: Wenbishan (26.8 N, 100.2 E), 20­IV­1997, Yao D. <i>et al.</i> leg. (BAAF). Paratype: (1 Ƌ, same data as holotype) (BAAF). <b>Etymology.</b> The name refers to the shape of the siphonal capsule. <b>Remarks.</b> This species resembles <i>S.</i> (<i>P.</i>) <i>fraxini wichmanni</i> Fürsch (in Gourreau 1974) in color pattern, but differs distinctly in male genitalia. The new species is similar to <i>S.</i> (<i>P.</i>) <i>ancontophyllus</i> Ren and Pang (1993) in the male tegmen, but differs from the latter in the robust siphonal capsule, the membranes on the apex of sipho, and the shape of the fifth and sixth abdominal sternites. It also resembles <i>S. rhododendri</i> Canepari (1997) in the robust siphonal capsule, but the latter, has a small black marking at the base of the pronotum, and the lateral lobes of the tegmen are enlarged and rounded apically in lateral view.
description: Published as part of <i>Yu, Guoyue, Montgomery, Michael E. &amp; Yao, Defu, 2000, Lady Beetles (Coleoptera: Coccinellidae) From Chinese Hemlocks Infested With The Hemlock Woolly Adelgid, Adelges Tsugae Annand (Homoptera: Adelgidae), pp. 154-199 in The Coleopterists Bulletin 54 (2)</i> on pages 180-181, DOI: 10.1649/0010-065X(2000)054[0154:LBCCFC]2.0.CO;2
description: {"references": ["Gourreau, J. M. 1974. Contribution symbol a l'Etude de la faune de France. Systematique de la tribu des Scymnini (Coccinellidae). Annals, Zoolgie et Ecolgie d'Animale, Institute Nationale Recherche Agronomique, Paris. 221 pp.", "Canepari, C. 1997. Coccinellidae (Coleoptera) from the Nepal Himalayas. Stuttgarter Beitrage Naturkunde Series A (Biologie) 565: 1 - 65."]}