Oemona separata Broun

Lu, Wen & Wang, Qiao, 2005, Newman with discussion of the taxonomic position of the Australian species, O. simplex White (Coleoptera: Cerambycidae: Cerambycinae), Zootaxa 971, pp. 1-31 : 7-11

Oemona separata Broun

( Figs 9–18 )

Aemona separata Broun, 1921: 659 .

Oemona separata . — Hudson, 1934: 207; Blair, 1937: 262.

Material examined

Syntypes. 1 Ψ, Maggie Terrace, 23.xii.1915, bearing a red circular BM type label, and a white label with a handwritten no. 4245 ( BMNH, Broun Coll.1922­482); 1 ♂, Dun Mts, ii.1912, bearing a handwritten no. 4245 on a white label, and a male symbol ( BMNH, Broun Coll.1922­482).

Other material. New Zealand: 35 ♂, 22 Ψ. SD: 1 Ψ, Queen Charlotte Sd, Bay of Many Coves, malaise trap in Nothofagus truncata , mixed broadleaf, podocarp forest, 27.xii–10.ii.1994 ( LUNZ); 2 Ψ, as above but beaten from N. truncata branch, 26.xii.1993 ( LUNZ); 2 ♂, 2 Ψ, as above but 06.i.1993 ( LUNZ); 2 ♂, as above but 25.x.1993 ( LUNZ); 1 ♂, as above but beaten from dead N. truncata branch ( LUNZ); 1 ♂, as above but beaten from N. fusca ( LUNZ). NN: 1 ♂, Whangamoa, 06.ii.1964 ( NZAC); 1 Ψ, as above but ex dead branch N. truncata , 31.i.1967 ( NZAC); 1 ♂, as above but 01.i.1967 ( NZAC); 1 Ψ, as above but ex Nothofagus , 21.ii.1964 ( NZAC); 1 ♂, Whangamoa Sddle, ex N. truncata , 13.vi.1967 ( NZAC); 1 ♂, Dun Mt, beech forest, Nelson ( NZAC); 1 ♂, 1 Ψ, as above but 02.i.1959 ( NZAC); 1 female, Dun Mt, 30.xii.1953 ( NZAC); 1 Ψ, as above but 600m, 06.ii.1973 ( NZAC); 1 Ψ, Mt. Arthur, Flora Saddle, ex N. fusca , 26.i.2001 ( LUNZ); 1 ♂, Eves Valley, 30.x.1972 ( NZAC); 1 ♂, Flora Rly, 04.ii.1923 ( NZAC); 1 Ψ, Roding Val., ex. N. solandri , 27.vii.1967 ( NZAC); 1 Ψ, Golden Downs, 29.xii.1938 ( NZAC); 3 ♂, Nelson, 17–20.i.1949 ( NZAC); 1 ♂, Captain Creek Hut Mt Richmond State Forest Park, 41 22S, 173 26E, 28.xii.1996 ( MONZ); 1 ♂, Takaka Hill, 02.ii.2001 ( LUNZ). MB: 1 ♂, Upper Maitai, 29.i.1945 ( NZAC); 2 ♂, Pelorus Bridge, 12.x.1967 & 20.vi.1967 ( NZAC); 1 Ψ, Upper Maitai, 14.ii.1943 ( NZAC). BR: 1 Ψ, Ecology Div Stn, 550m, Mt Misery, at light, 24.i.1977 ( NZAC); 1 Ψ, L Rotoiti, 26.xii.1979 ( NZAC); 1 ♂, 1 Ψ, as above but 02.i.1935 ( NZAC); 1 ♂, Lake Rotoroa nr camp ground, beaten from follage Nothofagus , podocarp forest, 10.i.1993 ( LUNZ). KA: 1 ♂, Kaikoura, 11.i.1953 ( WMNZ). NC: 1 Ψ, Arthurs Pass, Rough Creek, 01.iv.1974 ( NZAC); 1 Ψ, as above but iii.1975 ( NZAC); 1 Ψ, Halpin CK, 19.i.1934 ( MONZ); 1 ♂, Arthurs Pass, 11.i.1933 ( MONZ); 1 Ψ, as above but 19.ii.1987 ( AMNZ); 1 ♂, 2 Ψ, Lees V, 550m, beating N. solandri , 20.i.1984 ( LUNZ); 1 Ψ, Arthurs Pass NP Andrews Stream, on N. solandri at night, 700m, 19.i.1985 ( LUNZ). MC: 1 Ψ, Craigieburn, beating dead branches, 06.iii.1987 ( LUNZ); 1 ♂, 1 Ψ, as above but 07.iii.1987 ( LUNZ); 1 Ψ, Craigieburn, at night on tree, 05.iii.1988 ( LUNZ); 3 ♂, Craigieburn V, beaten from dead N. solandri , 06.iii.1993 ( LUNZ); 1 ♂, Craigieburn V, 1300m, on dead tree at night, 16.iii.1991 ( LUNZ).

Redescription

Male ( Fig. 17 ). Body length: 10.7–15.8 mm.

Colour patterns. Body yellowish brown; apex of femora blackish brown.

Head. Width 3.1–3.2 as long as distance between upper lobes of eyes; postclypeus with a transverse shining carina in front of transverse groove between tentorial pits; transverse groove between tentorial pits more or less straight in middle; distance between lower lobes of eyes 2.5–3.3 distance between antennal socket and lateral angle of postclypeus, and 1.6–1.9 distance between upper lobes of eyes. Antennae distinctly longer than body; apex of segment 9 reaching or beyond elytral apex; segment 3 as long as or slightly longer than scape, and distinctly longer than segment 4; segment 5 shorter than segment 6.

Thorax. Prothorax 0.9 as long as wide, widest at middle; sides rounded, with dense fine punctures and pubescence; disc with irregular rugae and dense, pale yellow hairs. Prosternum in front of coxae divided by a shallow transverse depression into two parts, with anterior carinate, more or less shining, and posterior with dense punctures and pubescence. Elytra 2.4–3.0 as long as shoulders, and 4.2–4.9 as long as prothorax. Metasternum with dense pubescence and sparse erect hairs. Hind femora 1.7–1.8 as long as prothoracic width.

Terminalia. Apex of ventral median lobe pointed and apex of dorsal lobe rounded; ventral lobe distinctly longer than dorsal lobe. Spined region of internal sac slightly longer than basal unspined region, divided into 3 sections: first section about 1/2 length of unspined region, with long simple spines; second section slightly shorter than first section, with finger­shaped spines, and with a semicircular chitinous structure near third section; third section with a Y­shape chitinous structure near base and with no spines ( Fig. 9 ). Eighth sternite parallel at sides, with an oval­shaped membrane area in middle and dense simple microspines on ventral surface; apex V­shaped, with dense setae ( Fig. 10 ). Eighth tergite rounded or slightly emarginate at apex, with dense simple microspines and multibranched spines on dorsal surface ( Fig. 11 ). Parameres 1/6–1/5 length of tegmen ( Fig. 12 ). Ventral apodeme without inner process between arms, stem longer than arms ( Fig. 13 ).

Female ( Fig. 18 ). Body length: 11.4–17.6 mm.

Antennae slightly longer than body; antennal segment 3 shorter or as long as scape. Width of head 3.0–3.4 as long as distance between upper lobes of eyes; distance between lower lobes of eyes 2.5–2.7 distance between antennal socket and lateral angle of postclypeus. Prothorax without punctures at sides. Elytra 2.8–2.9 as long as shoulders and 4.8–5.1 as long as prothorax.

Ovipositor. Paraproct baculi extending from about basal 1/3 to coxite; proctiger baculus about as long as paraproct baculus and 2.9 length of dorsal baculus. Length of stylus slightly shorter than coxite width ( Fig. 14 ).

Spermatheca. C­shaped, gradually narrowed towards base. Spermathecal gland arising from about basal 1/3 of spermatheca ( Fig. 15 ).

Eighth sternite. Nearly square­shaped, width 1.3 as long as length; length of needle 2.5–2.6 length of eighth sternite ( Fig. 16 ).

Biology

Host plants are Nothofagus truncata , N. solandri , and N. fusca . About 90% of the adults were collected during December, January, February and March, 10% found in April, June, July and October and none in other months.

Distribution ( Fig. 49 )

Widely distributed in northern South Island, especially in Nelson, Marlborough Sounds, Marlborough, Mid Canterbury, Buller and North Canterbury. Not distributed in the North Island.

Comments

This species resembles O. simplicicollis but differs by having the body yellowish brown; the transverse groove between tentorial pits straight at middle; antennal segment 5 shorter than segment 6; internal sac with long, simple spines, finger­shaped spines and a semicircular chitinous structure.

Figures

FIGURE 49. Known distribution of Oemona:, O. separata;, O. simplicicollis;, O. hirta;, O. plicicollis.

FIGURES 9 – 16. Terminalia of Oemona separata: 9, median lobe and internal sac: dl, dorsal lobe; vl, ventral lobe; sr, spined region; ur, basal unspined region; S 1, first spined section; S 2, second spined section; S 3, third spined section; 10, male eighth sternite; 11, male eighth tergite; 12, tegmen: pa, paramere; rf, roof; 13, ventral apodeme; 14, ovipositor: pb, proctiger baculus; pab, paraproct baculus; db, dorsal baculus; cox, coxite; sty, stylus; 15, spermatheca, sg, spermathecal gland; 16, female eighth sternite. sm, simple microspines; ms, multi­branched spines. Scale lines for Figs 9 – 14, 16 = 1 mm; scale lines for Fig. 15 = 0.4 mm.

FIGURES 17 – 18. Dorsal view of Oemona separata: 17, male; 18, female. Scale lines: 10 mm.