Oemona Newman

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 : 4-6

Genus Oemona Newman

Oemona Newman, 1840: 8 . —Thomson, 1964: 447; Lacordaire, 1869: 343; Sharp, 1886: 436; Aurivillius, 1912: 115; Hudson, 1934: 207; Blair, 1937: 262. [Type species: O. humilis Newman, 1840: 8 ].

Isodera White, 1846: 21 .

Aemona . — Broun, 1880: 570; Broun, 1893: 1274.

Diagnosis

The genus can be distinguished by a combination of the following characters: head retractile to eyes, thus prothorax usually touching eyes; areas between eyes and antennal sockets and each side of vertex with dense, long, yellowish hairs ( Fig. 1 ); pronotal disc without punctures; each side of prothorax with dense, fine punctures in male but no punctures in female; prosternum in front of coxae divided by a transverse depression into two parts, with anterior carinate, smooth and shining, and posterior with punctures or some obsolete wrinkles ( Fig. 2 ); elytra with dense punctures and pubescence; hind tarsal segment 1 longer than segments 2+3.

Redescription

Body length: Male, 8.7–24.4 mm; female, 11.4–30.9 mm.

Colour patterns. Body yellowish brown or dark brown.

Head. Head slightly narrower than prothorax, with a longitudinal sulcus between antennae; head retractile to eyes, thus prothorax usually touching eyes; areas between eyes and antennal sockets and each side of vertex with dense, long, yellowish hairs; vertexfrontal region with dense, irregular punctures; distance between lower lobes of eyes 1.6– 3.3 distance between antennal socket and lateral angle of postclypeus, and 1.5–2.7 distance between upper lobes of eyes. Antennal segments 3 and 4 slightly shorter than following segments.

Thorax. Prothorax 0.9–1.2 as long as wide, anterior edge truncate and posterior edge bisinuated; disc without punctures but with 2 slightly raised, shining tubercles near front; each side with dense, fine punctures in male but no punctures in female. Prosternum in front of coxae divided by a transverse depression into two parts, with anterior carinate, smooth and shining, and posterior with punctures or some obsolete wrinkles. Scutellum semicircular, covered with dense, bright yellowish hairs. Elytra 2.4–3.1 as long as shoulders, and 3.7–5.1 as long as prothorax; sides nearly parallel, gradually narrowed towards apex; surface with pale yellow hairs and rather coarse and rugose punctures, with punctures becoming shallower and confused towards apex; apices rounded. Femora with dense pubescence; hind femora 1.7–2.3 as long as prothoracic width; hind tarsal segment 1 longer than segments 2+3.

Male terminalia. Ventral lobe longer than dorsal lobe. Internal sac divided into 2 regions ( Fig. 9 ): basal unspined region and terminal spined region; spined region further divided into 2–3 sections, with 2–6 kinds of spines, including simple spines, long simple spines, hair­like spines, multi­branched spines, saw­shaped spines and finger­shaped spines ( Figs 3–8 ). Eighth sternite generally rounded at sides, with dense long setae on ventral surface; apex emarginate. Apex of eighth tergite rounded or emarginate. Roof of parameres robust and separate ( Fig. 12 ). Ventral apodeme with or without a small inner process between arms, stem longer than arms ( Fig. 13 ).

Female terminalia ( Figs 14–16 ). Proctiger baculi 0.4–1.8 as long as paraproct baculi, 1.4–2.9 as long as dorsal baculi; wide of eighth sternite 1.3–2.6 as long as length. Sclerotised needle of eighth sternite 2.0–3.1 as long as length of eighth sternite. Spermatheca generally C­shaped; spermathecal gland arising from basal 1/3 or near base.

Distribution ( Fig. 49 )

Distributed in both the North and South Islands of New Zealand.

Figures

FIGURE 1. Head of Oemona separata, front view: a, antennal socket; ac, anteclypeus; c, carina; dap, distance between antennal socket and lateral angle of postclypeus; del, distance between lower lobes of eyes; deu, distance between upper lobes of eyes; dg, distance between genae; g, gena; hw, head width; l, labrum; m, mandible; pc, postclypeus; tg, transverse groove between tentorial pits.

FIGURE 2. Head and prosternum of Oemona hirta, lateral view, male: cap, carina of prosternum; p, pronotum; a, antenna; f, front femur.

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 3 – 8. Forms of spines on internal sac of male genitalia: 3, simple spines; 4, long simple spines; 5, hair­like spines; 6, saw­shaped spines; 7, multi­branched spines; 8, finger­shaped spines.