Scymnomorphus bimaculatus, Szawaryn, 2018

Szawaryn, Karol, 2018, Missing geographic link: minute lady beetles (Coleoptera: Coccinellidae: Microweiseinae) from Mount Wilhelm, New Guinea, Acta Entomologica Musei Nationalis Pragae 58 (1), pp. 227-236 : 230-232

Scymnomorphus bimaculatus sp. nov. ( Figs 1A–F , 2A–H, 4A–C,E–G, 5E)

Type locality. Papua New Guinea, Madang province, E slope of Mt. Wilhelm, Kombunomambuno, 3200 m a.s.l., 5°48′24.1128″S 145°4′22.5228″E.

Type material. HOLOTYPE:, ‘ New Guinea, Mt. Wilhelm, P3139- CoCocc Ibisca Niugini 2012/ FIT-MW3200-L-4/8-d08, plot 12, start date 23-Oct-12, end date 25-Oct-12, order 17341, elevation 3200m’ ( MNHN). PARATYPES: 1 spec., ‘New Guinea, Mt.Wilhelm, Ibisca Niugini 2012/ P3136 FIT-MW3200-L-1/8-d02, plot 12, 17-Oct-12 – 19-Oct-12, order 17520, elevation 3200m’ ( MNHN); 1, ‘P3113-06663 FIT-MW- 3200-I-2/8-d03, plot 9, 18-Oct-12 – 20-Oct-12, order 8402, elevation 3200m’ ( MNHN); 1 1 ♀, ‘P3201 FIT-MW3200-T-2/8-d04, plot 20, 19-Oct-12 – 21-Oct-12, order 17192, elevation 3200m’ ( MNHN); 1, ‘P3170 FIT-MW3200-P-3/8-d06, plot 16, 21-Oct-12 – 23-Oct-12, order 17454, elevation 3200m’ ( MNHN); 1, ‘P3194 FIT-MW3200-S-3/ 8-d06, plot 19, 21-Oct-12 – 23-Oct-12, order 17908, elevation 3200m’ ( MNHN); 1 ♀, ‘P3083 FIT-MW3200-E-4/8-d07, plot 5, 22-Oct-12 – 24- Oct-12, order 17469, elevation 3200m’ ( MNHN); 1, ‘P3116-06190 FIT-MW3200-I-5/8-d09, plot 9, 24-Oct-12 – 26-Oct-12, order 8413, elevation 3200m’ ( MNHN); 1 ♀, ‘P3204 FIT-MW3200-T-5/8-d10, plot 20, 25-Oct-12 – 27-Oct-12, order 18003, elevation 3200m’ ( MNHN); 1 ♀, ‘P3133-06010 FIT-MW3200-K-6/8-d12, plot 11, 27-Oct-12 – 29-Oct-12, order 8453, elevation 3200m’ ( MNHN); 1 ♀, ‘P3094 FIT-MW3200-F-7/8-d13, plot 6, 28-Oct-12 – 30-Oct-12, order 17760, elevation 3200m’ ( MNHN); 1 ♀, ‘P3572 FIT-MW3700-Q-7/8-d14, plot 17, 29-Oct-12 – 31-Oct-12, order 16831, elevation 3700m’ ( MNHN); 1, ‘P3182 FIT-MW3200-Q-7/8-d14, plot 17, 29-Oct-12 – 31-Oct-12, order 17107, elevation 3200m’ ( MNHN); 1, ‘P3191 FIT-MW3200-R- -8/8-d16, plot 18, 31-Oct-12 – 2-Nov-12, order 17416, elevation 3200m’ ( MNHN); 1 ♀, ‘P2419 FIT-MW2200-S-8/8-d16, plot 19, 31-Oct-12 – 2-Nov-12, order 20271, elevation 2200m’.

Diagnosis. Scymnomorphus bimaculatus sp. nov. can be easily distinguished from congeners by its characteristic coloration with black, longitudinal macula on each elytron (sometimes covering most of the elytral surface), and male abdominal ventrite 5 with one large glandular opening, a unique character within the genus.

Description. TL: 1.25–1.53, TW: 0.82–0.96, TL/TW: 1.45–1.54, PL/PW: 0.36–0.39, EL/EW: 1.18–1.27.

Body light brown with one, longitudinal black macula in middle part of each elytron ( Figs 1A–C ). In some specimens dark maculae are extended and cover most of elytral surface ( Figs 1D–F ). Underside light brown except mesoventrite reddish brown. Legs and antennae yellow.

Body minute, elongate oval, convex, dorsum pubescent. Head small, punctures on frons larger than eye facets and bearing seta, separated by 1–2 times their diameter. Clypeus prominent, distinctly bordered laterally, weakly arcuate anteriorly ( Fig. 4G ). Eyes small and coarsely faceted. Antenna consisting of 10 antennomeres ( Fig. 2B ); pedicel swollen, about as long as antennomere 3; antennomere 3 narrow, elongate; antennomere 4 slightly elongate; antennomere 5 about as long as antennomere 4 but distinctly broader; antennomere 6 small, shorter than antennomere 4 and 5; antennomeres 7 and 8 transverse, broadening anteriorly; antennomeres 9 and 10 forming 2-antennomere club, antennomeres 9 and 10 sub-equal in length. Pronotum widest at base and distinctly narrowing anteriorly. Pronotal disc convex, coarsely punctate, punctures smaller than those on head, separated by 1–2 times their diameter. Scutellar shield triangular, glabrous ( Fig. 4A ). Elytron shiny, densely coarsely punctured, punctures dual, smaller punctures irregular except for sutural and lateral rows, each bearing short seta; on disc setae directed into suture, on lateral sides directed posteriorly; larger punctures triangular in shape, irregularly distributed ( Fig. 4B ). Elytral margins narrow, hardly visible from above. Lateral part with elytral carina distinctly separated from margin, forming double, thickened border of epipleuron and extending to level of abdominal ventrite 3 ( Fig. 1B ). Mesoventrite short and broad, distinctly bordered anteriorly, fused with metaventrite medially ( Fig. 4F ). Metaventrite and abdomen densely covered with large, transversely oval pores, with smaller puncture bearing short seta above each pore ( Fig. 4E ). Metaventral postcoxal lines joined on metaventral process forming narrow arc, straight, laterally descending ( Fig. 4F ). Abdominal postcoxal lines incomplete, not divided into two lines, not reaching posterior margin of abdominal ventrite 1 nor lateral margin ( Figs 2A, H ). In males abdominal ventrite 5 with single large glandular opening in middle part ( Figs 2H , 5E ).

Male genitalia ( Figs 2E–G ). Penis simple and slender, curved and narrowing towards apex; penis capsule with short and stout outer arm and small and narrow inner one. Tegmen with penis guide long and slightly broadened in middle in lateral view, with apex pointed, in ventral view broadened at base then narrowing towards apex, apical part pointed and strongly roundly bent; parameres reduced, ventral paramere (as situated in abdomen) bearing two setae and dorsal paramere five setae.

Female genitalia ( Figs 2C, D ). Ovipositor triangular, narrow, elongate, bearing long styli with one seta on apex of each stylus; spermatheca composed of small basal bulge, narrow channel in middle and large spherical bulge apically.

Etymology. The species name is Latin adjective bimaculatus (- a, - um) referring to the characteristic two dark maculae on elytra.

Habitat. Most of the specimens were collected at the elevation of 3200 m a.s.l., and according to LEPONCE et al. (2016) this type of forest was classified as “upper montane forest” and was characterized by presence of Dacrycarpus, Papuacedrus and Amaracarpus trees, with Myrsine, Pittosporum, Ascarina, Decaspermum, and Elaeocarpus in the understorey. One specimen was collected at the elevation of 2200 m a.s.l. “mid montane forest” and one at 3700 m a.s.l. “sub-alpine forest”.

Distribution. Papua New Guinea, Mt. Wilhelm.

Figures

Fig.1. Habitus of Scymnomorphus species from Mt. Wilhelm, New Guinea. A–F – S. bimaculatus sp. nov.; G–I – S. kausi sp. nov.; J–L – S. papuensis sp. nov. A, D, G, J – dorsal view; B, E, H, K – lateral view; C, F, I, L – frontal view.

Fig. 4. Morphology of Scymnomorphus species. A–C, E–G – S. bimaculatus sp. nov.: A – habitus, dorsal; B – magnification of the elytral punctures; C – mouthparts, ventral; E – magnification of the metaventral punctures; F – meso- and metaventrite; G – head, anterior view. D, H–J – S. papuensis sp. nov.: D – habitus, ventral; H – magnification of the metaventral punctures; I – meso- and metaventrite; J – head, anterior view.

Fig. 2. Morphology of Scymnomorphus species. A–H – S. bimaculatus sp. nov.: A – abdomen, female; B – antenna; C – ovipositor; D – spermatheca; E – tegmen; inner view; F – tegmen, lateral view; G – penis, lateral view; H – abdomen, male. I–P – S. kausi sp. nov.: I – abdomen, female; J – antenna; K – ovipositor; L – spermatheca; M – tegmen, inner view; N – tegmen, lateral view; O – penis, lateral view; P – abdomen, male (arrows indicate glandular opening pores).

Fig. 5. Morphology of Scymnomorphus species. A–D, F – S. kausi sp. nov.: A – habitus, dorsal; B – ventral view; C – magnification of metaventral punctures; D – glandular openings on abdominal ventrite 5 in male; F – head, anterior view. E – S. bimaculatus sp. nov., glandular opening on abdominal ventrite 5 in male.