Oemona simplicicollis 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 : 11-14

Oemona simplicicollis Broun

( Figs 19–28 )

Oemona simplicicollis Broun, 1880: 571 . — Broun, 1893: 1276; Sharp, 1886: 438; Hutton, 1904: 192; Aurivillius, 1912: 116; Hudson, 1934: 207; Blair, 1937: 262.

O. mutica Sharp, 1886: 439 . — Broun, 1893: 1276; Hutton, 1904: 192; Aurivillius, 1912: 116; Hudson, 1934: 207; Blair, 1937: 262 (synonymy).

O. debilis Sharp, 1886: 439 . — Broun, 1893: 1277; Hutton, 1904: 192; Aurivillius, 1912: 115; Hudson, 1934: 207; Blair, 1937: 262 (synonymy).

Material examined

O. simplicicollis . Syntypes. 1 ♂ and 1 Ψ, Wellington ( BMNH).

O. mutica . Syntypes. 1 ♂, Picton, specimen mounted on card, bearing a red circular BM type label and a white label with Sharps handwritten Oemona mutica , male symbol and Type DS (BMNH, Sharp Coll. 1905­313); 1 Ψ, same data as above (BMNH, Sharp Coll. 1905­313).

O. debilis . Syntypes. 2 Ψ, Picton, Helms, both specimens mounted on the same card, below which there is Sharps handwritten Oemona debilis , Types D.S., bearing a red circular BM type label (BMNH, Sharp Coll. 1903­313).

Other material. New Zealand: 15 ♂, 12 Ψ. WN: 1 Ψ, Wellington, 03.xi.1953 ( NZAC); 1 ♂, Tinakori Hill, Wellington, 12.xii.1991 ( JNNZ); 1 ♂, Wiltons Bush, 15.iii.1942 ( NZAC). SD: 1 Ψ, Queen Charlotte Sound, Te Iro Bay, 19.i.1986 ( LUNZ); 1 Ψ, as above but attracted to light at night, coastal bush, 09.i.1987 ( LUNZ); 1 ♂, as above but 22.xii.1985 ( LUNZ); 1 ♂, Queen Charlotte Sd, Bay of Many Coves, 02.i.1993 ( LUNZ); 4 ♂, as above but malaise trap, kanuka ( Leptospermum ericoides ) coastal forest, 04­ 31.i.1992 ( LUNZ); 3 ♂, 3 Ψ, as above but malaise trap, Kunzia coastal broadleaf forest, 24.x–27.xii.1993 ( LUNZ); 1 Ψ, Tory Channel, Te Iro Bay, malaise trap in coastal scrub and broadleaf forest, 1–6.i.1993 ( LUNZ); 1 female, Queen Charlotte Sd, Bay of Many Coves, attracted to light at night, costal bush, 04.i.1987 ( LUNZ). KA: 1 Ψ, Conway Flat, xii.1968 ( LUNZ); 1 Ψ, Oaro, 20.iii.1976 ( LUNZ); 1 Ψ, Kaikoura, 11.i.1953 ( WMNZ); 1 ♂, Puhi Puhi Res., 3–6.xii.1957 ( NZAC). NC: 1 Ψ, Rangiora, ex. dead hazelnut branch ( Corylus sp.), 13.xi.1942 ( NZAC).

Redescription

Male ( Fig. 19 ). Body length: 8.7–12.4 mm.

Colour patterns. Body dark brown to reddish brown.

Head. Width 3.4–3.8 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 curved toward frons; distance between lower lobes of eyes 1.6–1.9 distance between antennal socket and lateral angle of postclypeus, and 1.6– 2.7 distance between upper lobes of eyes. Antennae slightly longer than body; segment 3 slightly longer than scape and segment 4; segments 5 as long as segment 6.

Thorax. Prothorax 0.9–1.0 as long as wide, widest at middle; sides rounded, with dense fine punctures and pubescence; disc with dense, pale yellow hairs and 2 tubercular elevations near front. Prosternum in front of coxae divided by a transverse depression into 2 parts, with anterior polished, and posterior with dense, fine punctures and pubescence. Elytra 2.7–3.1 as long as shoulders, and 3.7–4.2 as long as prothorax; surface with depressed yellowish hairs and coarse and rugose punctures. Metasternum with dense pubescence and sparse erect hairs. Femora with dense pubescence; hind femora 1.8–1.9 as long as prothoracic width.

Terminalia. Apex of ventral and dorsal median lobes pointed with dorsal lobe more robust; ventral lobe longer than dorsal lobe. Spined region of internal sac about as long as unspined region, divided into 3 sections: first section very short, with simple spines; second section about 13 as long as first section, with saw­shaped spines, dense at sides and sparse in middle; third section about 2 as long as first 2 sections, with a Y­shape chitinous structure but no spines ( Fig. 21 ). Eighth sternite rounded at sides and slightly emarginate at apex, with a semicircular membranous area in apical­middle region; ventral surface with dense simple microspines; width about 2.8 as long as length (middle), and 1.7–1.8 as long as length of needle ( Fig. 22 ). Eighth tergite slightly emarginate at apex, dorsal surface with dense microspines at base and middle and with wave­shaped spines near apex ( Fig. 23 ). Parameres 1/6 length of tegmen ( Fig. 24 ). Ventral apodeme with an inner process between arms but no setae, stem almost as long as arms ( Fig. 25 ).

Female ( Fig. 20 ). Body length: 12.1–16.8 mm.

Antennae slightly shorter. Pronotal sides without punctures but with 2 more distinctly raised shining tubercules near front. Elytra 2.7–3.0 as long as shoulders and 3.7–4.3 as long as prothorax. Prosternum in front of coxae with some obsolete wrinkles or a few shallow punctures.

Ovipositor. Paraproct bacculi 0.4 length of proctiger baculus, with dorsal baculi absent. Length of stylus distinctly shorter than width of coxite ( Fig. 26 ).

Spermatheca. Terminal part slightly curved; moderately narrowed towards base. Spermathecal gland arising from basal 1/4 of spermatheca ( Fig. 27 ).

Eighth sternite. Subrectangular, with base emarginate, width 2.4–2.6 as long as length (middle); length of needle about 3 as long as length of eighth sternite ( Fig. 28 ).

Biology

Known host is dead Corylus sp. It can be collected from coastal Leptospermum ericoides and Kunzia sp. forests and at light. Adults were collected from October to March, but about 90% were found from October to January.

Distribution ( Fig. 49 )

Distributed in Marlborough Sounds, Kaikoura, North Canterbury, Wellington, Nelson and Mid Canterbury.

Comments

This species is similar to O. hirta but differs by having the pronotum as long as or slightly shorter than wide; pronotal disc without transverse rugae; prosternum in front of coxae with dense deep punctures in male; the scape, femora and tarsi uniformly coloured; internal sac with a Y­shape chitinous structure.

Figures

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

FIGURES 19 – 20. Dorsal view of Oemona simplicicollis: 19, male; 20, female. Scale lines: 10 mm.

FIGURES 21 – 28. Oemona simplicicollis: 21, median lobe and internal sac: sr, spined region; ur, unspined region; S 1 – S 3, spined sections 1 – 3; 22, male eighth sternite; 23, male eighth tergite; 24, tegmen; 25, ventral apodeme; 26, ovipositor; 27, spermatheca; 28, female eighth sternite. sm, simple microspines; wss, wave­shaped spines. Scale lines for Figs 21 – 24 and 27 = 0.5 mm; scale lines for Figs 26, 28 = 1 mm.