Globorentonium plaumanni, Lawrence, John F. & Slipinski, Adam, 2013

Lawrence, John F. & Slipinski, Adam, 2013, Globorentonium, a new genus of rentoniine Trogossitidae (Coleoptera: Cleroidea) from Australia and Brazil, Zootaxa 3710 (3), pp. 257-270 : 268-269

Globorentonium plaumanni sp. n.

( Figs 1 A, 5)

Diagnosis. This species differs from the two Australian species in the presence of a frontoclypeal suture, the complete fusion of basal abdominal ventrites, so that there appears to be only two, and the more elongate aedeagus and ovipositor.

Description. Length 0.95–1.15 mm. Body length 1.03–1.14 times greatest width. Head strongly declined, its length 1.12 times as great as width behind eyes, with strongly curved, sharp occipital ridge ending at posterior edges of eyes, which are about 0.25 times as long as head, moderately prominent and coarsely facetted. Frontoclypeal suture weakly impressed and straight. Antenna ( Fig. 5 C) about as long as head width, 10-segmented with 1-segmented club; pedicel about 0.67 times as long as scape and 1.5 times as long as wide; antennomere 3 about 0.5 times as long as pedicel and slightly longer than wide; antennomere 4 about as long as wide; antennomeres 5–9 transverse; terminal antennomere about 1.67 times as long as wide and narrowly rounded at apex. Gulamentum simple. Pronotum about 0.36–0.44 times as long as wide; posterior angles slightly obtuse. Prosternal process subacute. Scutellar shield concealed beneath elytral bases and posterior edge of pronotum. Elytra about 0.61–0.78 times as long as combined width and 1.46–2.29 times as long as pronotum; epipleuron broad at base, narrowed posteriorly, very strongly oblique, extending to about middle of elytron. Mesocoxal cavities separated by 0.8 times shortest diameter of one cavity; mesoventrite with slightly concave apex. Shortest length of metaventrite ( Fig. 5 F) about 1.36 times shortest diameter of mesocoxal cavity, with pair of straight postcoxal lines extending from lateral fouth of mesocoxal cavity to posterolateral corner of ventrite. Protibia ( Fig. 5 B) widest at about apical third, with outer edge subangulate, lined with evenly spaced but not contiguous setae to widest point, then with contiguous setae; metatibia gradually expanded apically with contiguous seae at apex. Tarsomeres 1–4 with several long setae beneath. Abdomen ( Fig. 5 D) with 5 ventrites, the first 4 of which are fused with divisions between them absent, so that there appears to be 2 ventrites only; first apparent ventrite (ventrites 1– 4) tumid along midline, so that broad, longitudinal shelf formed. Segment IX in male with moderately long, spiculum gastrale, broad at base and narrowly rounded at apex. Aedeagus ( Figs. 6 G–H) more than 7 times as long as wide, with long, slender basal strut lined with baculi; parameres short and broad, more or less separate but fused to phallobase; penis very short, semimembranous. Ovipositor about 2 times as long as wide at base.

Type specimens: Holotype, sex unkown: Brazil: Santa Catarina: Nova Teutonia (27° 11’ S, 52° 23’ W), xi. 1958, F. Plaumann (MZSP). Paratypes: Santa Catarina: Nova Teutonia (27° 11’ S, 52° 23’ W), xi. 1958, F. Plaumann (5, ANIC, MCZ); same locality and collector, vi.1958, viii.1962, xi.1967; x.1967, viii.1968; xi.1968; iii.1976; iv.1976 (15, ANIC, NZAC, MZSP, FMNH); Pinhal Preto, xi.1957, F. Plaumann (1, ANIC); Seara, v.1958, F. Plaumann (3, FMNH, ANIC).

Distribution. Known only from the southern Brazilian state of Santa Catarina.

Etymology: Named for Fritz Plaumann, whose numerous collections from southern Brazil have led to the description of many new Neotropical beetle species.

Figures

FIGURE 1. Globorentonium species, habitus: (A) G. plaumanni sp. n., dorsal, length = 1.05 mm; (B) G. lescheni sp. n., dorsal, length = 1.1 mm; (C – F) G. globulum sp. n., habitus, length = 1.1 mm: (C – D) dorsal; (E – F) lateral.

FIGURE 5. Globorentonium plaumanni sp. n.: (A) head, dorsal; (B) fore leg; (C) antenna; (D) abdomen, ventral; (E) elytron; (F) pterothorax, ventral, with right mesocoxa removed.

FIGURE 6. Globorentonium genitalia: (A – D) G. globulum sp. n.: (A) tegmen, ventral; (B) penis, ventral; (C) penis, lateral; (D) ovipositor, ventral. (E – F) G. lescheni sp. n.: (E) tegmen, ventral; (F) penis, ventrolateral. (G – H) G. plaumanni sp. n.: (G) tegmen, ventral; (H) tegminal apex, showing small, fixed parameres.