Oemona plicicollis Sharp

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 : 21-24

Oemona plicicollis Sharp

( Figs 39–48 )

Oemona plicicollis Sharp, 1886: 437 . — Broun, 1893: 1276; Hutton, 1904: 192; Aurivillius, 1912: 116; Hudson, 1934: 207; Blair, 1937: 262.

O. inaequalis Sharp, 1886: 438 . — Broun, 1893: 1275; Hutton, 1904: 192; Aurivillius, 1912: 116; Hudson, 1934: 207; Blair, 1937: 262 (synonymy).

Aemona sublineata Broun, 1909: 281 . — Aurivillius, 1912: 116; Hudson, 1934: 207; Blair, 1937: 262 (synonymy).

Material examined

O. plicicollis . Syntypes. 1 ♂, Greymouth, Helms, bearing a red circular BM type label, and a label with Sharps handwritten Oemona plicicollis and a male symbol ( BMNH, Sharp Coll. 1903­313); 1 Ψ, Picton, Helms, specimen mounted on card, below which there is Sharps handwritten Oemona plicicollis in black ink and a female symbol ( BMNH).

O. inaequalis . Holotype. ♂, Picton, Helms, bearing a red circular BM type label, and a white label with Sharps handwritten Oemona inaequalis in black ink and a male symbol (BMNH, Sharp Coll. 1903­313).

O. sublineata . Holotype. Ψ, Karori, bearing a red circular BM type label, a white label with handwritten no. 2992 in black ink, and a white label with handwritten Aemona sublineata (BMNH, Broun Coll. 1922­482).

Other material. New Zealand: 11 ♂, 11 Ψ. ND: 1 Ψ, Tawhiti Rahi Is., Poor Knights Islands, 15–24.i.1943 ( NZAC). CL: 1 Ψ, Tapu Rd, CL Saddle, reared from Weinmannia sylvicola , 07.x.1977 ( NZAC); 1 Ψ, Tapu Rd, 450m, 15.x.1977 ( NZAC); 1 ♂, Little Barrier I, Caretakers Garden, 22.ii.1976 ( NZAC); 1 ♂, Great Barrier I, Little Windy Hill, 220m, forest edge, malaise trap, 11.xii.2001 – 18.i.2002 ( AMNZ); 1 ♂, as above but 18.i– 21.ii.2002 ( AMNZ). WN: 1 Ψ, Hutt Valley, Wellington, 03.i.1929 ( WMNZ); 1 ♂, Wainuiomata, 20.xii.1961 ( NZAC); 1 ♂, as above but 27­I­1962 ( NZAC). SD: 1 Ψ, 1 ♂, Stephens Isd., 14–18.i.1933 ( NZAC); 1 Ψ, as above but sweep, ii.1971 ( NZAC); 1 ♂, DUrville Island, 14.i.1931 ( WMNZ); 1 ♂, as above but 20–24.i.1946 ( NZAC). NN: 1 Ψ, Abel Tas NP, Totaranui, light trap, 06.xi.1981 ( LUNZ); 1 Ψ, Nelson, 28.xi.1942 ( NZAC); 1 Ψ, as above but 11.i.1928 ( NZAC); 1 Ψ, Nelson ( NZAC); 1 ♂, Nelson, reared from Acacia myrtifolia, 1961 ( NZAC); 1 ♂, Nelson, 29.xii.1929 ( WMNZ); 1 ♂, Puponga Farm P, 07– 10.xi.1981 ( LUNZ). MB: 1 Ψ, Upper Maitai V, 18.xii.1932 ( NZAC).

Redescription

Male ( Fig.39 ). Body length: 11.8–20.3 mm.

Colour patterns. Body dark brown to reddish brown.

Head. Width 3.6–4.8 as long as distance between upper lobes of eyes; postclypeus with a transverse shining carina in front of transverse groove between tentorial pits; distance between lower lobes of eyes 1.6–1.8 distance between antennal socket and lateral angle of postclypeus, and 1.8–2.1 distance between upper lobes of eyes. Antennae distinctly longer than body; segment 3 as long as or shorter than scape and distinctly shorter than segment 4, segment 5 slightly longer than segment 6.

Thorax. Prothorax cylindrical, 1.0–1.1 as long as wide, widest in middle, sides rounded, with dense punctures and pubescence; disc with dense, pale yellow hairs, a linear longitudinal elevation and some short and less distinct transverse rugae. Prosternum in front of coxae divided by a shallow transverse depression into two parts, anterior carinate, with dense hairs, and posterior with dense deep punctures and pubescence. Elytra 2.6–3.1 as long as shoulders, and 3.7–4.0 as long as prothorax. Metasternum with dense pubescence and sparse erect hairs. Femora with dense pubescence; hind femora 1.8–2.2 as long as prothoracic width.

Terminalia. Apex of both ventral and dorsal median lobes pointed, and ventral lobe longer than dorsal lobe. Basal unspined region of internal sac with a ­shaped chitinous structure near spined region; spined region about as long as unspined region, and divided into 3 sections: first section with sparse, simple spines; second section> 2 as long as first section, with dense multi­branched spines in middle and dense, transversely arranged, saw­shaped spines at both sides; third section slightly longer than sections 1+2, with dense, long, simple spines and a Y­shape chitinous structure ( Fig. 41 ). Eighth sternite rounded at sides, apex slightly emarginated, with setae at apex and sparse, simple microspines on sides of ventral surface; middle region with a semicircular membranous area at middle area; width 3.0–3.1 as long as length (middle), and 3.0–3.7 as long as length of needle ( Fig. 42 ). Eighth tergite rounded at apex, dorsal surface with dense microspines, and wave­shaped spines ( Fig. 43 ). Parameres 1/7–1/9 length of tegmen ( Fig. 44 ). Ventral apodeme with an inner process between arms, stem about as long as arms ( Fig. 45 ).

Female ( Fig. 40 ). Body length: 14.3–20.3 mm.

Antennae as long as or slightly longer than body. Sides of prothorax without punctures; prothorax widest behind middle. Elytra 2.7–2.9 as long as shoulders and 3.7–3.8 as long as prothorax.

Ovipositor. Paraproct bacculi short, 0.6 length of proctiger baculi, a large area around dorsal baculi sclerotised. Length of stylus distinctly shorter than width of coxite ( Fig. 46 ).

Spermatheca. Robust, terminal part slightly curved. Spermathecal gland arising near base of spermatheca ( Fig. 47 ).

Eighth sternite. Rectangular, width 2.0–2.4 as long as length; length of needle 2.1– 2.8 as long as length of eighth sternite ( Fig. 48 ).

Biology

Known host plants are Acacia myrtifolia and Weinmannia sylvicola . Adults were collected between October and February. Females could be collected one month earlier than males. About 60% of adults were collected in December and January.

Distribution ( Fig. 49 )

Distributed in northern South Island, including Marlborough Sounds, Nelson, and Marlborough and the North Island, including Wellington, Northland and Coromandel.

Comments

This species is similar to O. hirta but differs by having the distance between the lower lobes of the eyes 1.8–2.1 distance between the upper lobes of the eyes; transverse rugae on pronotal disc shorter and less distinct; internal sac with a Y­shape chitinous structure. The species also resembles O. simplicicollis but differs by having antennal segment 4 distinctly longer than segment 3; apex of both ventral and dorsal median lobes sharply pointed; internal sac with a ­shaped chitinous structure in unspined region and with dense long simple spines around Y­shaped chitinous structure in spined region.

Figures

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

FIGURES 39 – 40. Dorsal view of Oemona plicicollis: 39, male; 40, female. Scale lines: 10 mm.

FIGURES 41 – 48. Oemona plicicollis: 41, median lobe and internal sac: sr, spined region; ur, unspined region; S 1 – S 3, spined sections 1 – 3; 42, male eighth sternite; 43, male eighth tergite; 44, tegmen; 45, ventral apodeme; 46, ovipositor; 47, spermatheca; 48, female eighth sternite. sm, simple microspines; wss, wave­shaped spines. Scale lines for Figs 41 and 47 = 0.5 mm; scale lines for Figs 42 – 46 and 48 = 1 mm. Scale lines = 1 mm.