Globorentonium lescheni, 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 : 264-265

Globorentonium lescheni sp. n.

( Figs 1 B, 3, 4)

Diagnosis. This species differs from G. globulum in having sparser elytral punctation, vestiture of decumbent or suberect hairs, lack of protibial spines except at apex, well developed sutures separating basal ventrites, simple gulamentum and less elongate third antennomere. From the Brazilian G. plaumanni the species differs in lacking a frontoclypeal suture and having basal abdominal ventrites distinctly separated, the aedeagus less elongate with apically expanded parameres and the ovipositor shorter and broader.

Description. Length 0.95–1.10 mm. Body length 1.08–1.24 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 0.33 times as long as head, moderately prominent and coarsely facetted. Frontoclypeal suture absent. Antenna ( Fig. 3 B, 4C) about as long as head width, 10-segmented with 1-segmented club; pedicel about 0.65 times as long as scape and 1.75 times as long as wide; antennomere 3 about 0.5 times as long as pedicel and slightly longer than wide; antennomeres 4–9 transverse; terminal antennomere about 1.5 times as long as wide and narrowly rounded at apex. Gulamentum ( Fig. 3 D, 4B) simple. Pronotum about 0.31–0.48 times as long as wide; posterior angles more or less right. Prosternal process apically rounded. Scutellar shield often concealed. Elytra about 0.69–0.91 times as long as combined width and 1.67–3.20 as long as pronotum; epipleuron narrow, strongly oblique extending almost to apex. Mesocoxal cavities separated by 0.6 times shortest diameter of one cavity; apex of mesoventrite broadly rounded. Shortest length of metaventrite about 0.85 times shortest diameter of mesocoxal cavity, with pair of straight postcoxal lines extending from lateral third of mesocoxal cavity to posterolateral corner of ventrite. Protibia ( Fig. 3 C, 4E) widest at about apical fourth, with outer edge angulate and simple, lacking contiguous setae but with few setae at and near apex; metatibia ( Fig. 4 D) gradually expanded apically, its outer edge with few setae and with spines only at apex. Tarsomeres 1–4 with a few short setae beneath. Abdomen ( Fig. 3 A, 4G) with 5 free ventrites; shortest length of ventrite 1 longer than that of 2 and 3 combined, ventrites 1–4 tumid at midline, each with short, rounded, posteriorly-projecting process overlapping ventrite behind it. Segment IX in male with moderately long, slender spiculum gastrale. Aedeagus ( Figs. 6 E–F) about 4.5 times as long as wide, with short, subacute basal strut; parameres moderately long, separate, apically expanded and rounded, fused to phallobase; penis about 0.7 times as long as tegmen, apically acute. Ovipositor about 1.33 times as long as wide at base.

Type specimens. Holotype male: Australia: New South Wales: Barrengarry Mtn., 10.5 km W Kangaroo Valley, 10.vi.1983, FMHD 83-216, rainforest litter, L. E. Watrous (ANIC). Paratypes: New South Wales: Allyn River, Chichester State Forest (32.08S, 151.27E), 10–11.xi.1981, ANIC Berl. 747, rainforest log and leaf litter, T. A. Weir (11, ANIC, NZAC); Barrengarry Mtn., 10.5 km W Kangaroo Valley, 10.vi.1983, FMHD 83-216, rainforest litter, L. E. Watrous (2, FMNH); same locality, 10.vi.1983, FMHD 83-216, rainforest litter, L. E. Watrous (4, FMNH); Dorrigo Nat. Park (30.22S, 152.43E), The Glade Area, Wonga Track, 13–15.xi.1990, ANIC Berlesate 1130, rainforest litter, T. A. Weir (1, ANIC); Gloucester Tops, end of Kerripit Rd., 10.ii.1984, ANIC Berlesate 931, trackside grass, L. Hill (2, ANIC); Mt. Keira, 21.vii.1983, FMHD 83-281, litter near stream, L. E. Watrous (1, FMNH); Macquarie Pass Nat. Park, 17.vii.1983, FMHD 83-274, rotten twigs and logs, L. E. Watrous (1, FMNH); Mount Royal State Forest, 48 km N Singleton, 23.vii.1983, FMHD 83-285, rainforest litter near stream, L. E. Watrous (2, FMNH); Tangarra Fauna Res., Macquarie Pass, 13.vi.1983, litter, L. E. Watrous (1, FMNH); Tulgo Wildlife Refuge, 48 km N Singleton, 19.vii.1983, FMHD 80-250, rainforest litter, L. E. Watrous (1, FMNH); Wright’s Lookout Track (30.30S, 152.23E), New England Nat. Park, 16–18.xi.1990, ANIC Berlesate 1131, litter under Nothofagus moorei & Dicksonia antarctica, T. A. Weir (1, ANIC).

Distribution. New South Wales.

Etymology. Named in honour of our good friend and colleague, Rich Leschen.

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 3. Globorentonium lescheni sp. n.: (A) abdomen, ventral; (B) antenna; (C) fore leg; (D) head, ventral.

FIGURE 4. Globorentonium lescheni sp. n., scanning electron micrographs: (A) head, dorsal; (B) head, ventral; (C) antenna; (D) hind leg; (E) apex of fore leg; (F) pterothorax, ventral, with left mesocoxa and right metacoxa removed; (G) abdomen, ventral; (H) prothorax, ventral, with both coxae 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.