Trichiocampus pruni Takeuchi

Smith, David R., 2011, Nematinae (Hymenoptera, Tenthredinidae) of Thailand, with notes on some other southeastern Asian nematines, Journal of Hymenoptera Research 22, pp. 1-27 : 4-6

Trichiocampus pruni Takeuchi Figs 1-3

Trichiocampus pruni Takeuchi 1956: 78, Figs 11, A-D.

Cladius takeuchii Liston, Taeger, and Blank, in Blank et al. 2009: 20. New name for

Trichiocampus pruni Takeuchi, considered a secondary homonym of Priophorus pruni Rohwer, 1922, if all placed in Cladius .

Description.

Female. Length, 6.0 mm. Entirely black; wings uniformly infuscated. Antennal length 3.0 × head width; 3rd antennomere 0.7 × length of 4th antennomere. Malar space 2.0 × diameter of front ocellus. Lower interocular distance 1.4 × eye height. Tarsal claw with long inner tooth, almost equal in length and width to outer tooth; with very small, indistinct basal lobe. Fore and hind basitarsomere subequal in length to following 3 tarsomeres combined. Sheath from above broad at base, evenly tapering to acute apex; in lateral view rounded with long, curved hairs ( Fig. 2 ). Lancet ( Fig. 3 ) broadly triangular; annuli without teeth or hairs; basal 6 annuli curved dorsally; serrulae lobelike, asymmetrical, with fine subbasal teeth.

Male. Not seen. Described as similar to the female and male genitalia illustrated by Takeuchi (1956).

Material examined.

"THAILAND Mae Hong Son, Namtok Mae Surin NP, Visitor's center, 19°21.593'N, 97°59.254'E, 228 m, Malaise trap, 19-26.viii.2007, Manu Namadkum leg., T5872"; "THAILAND Chiang Mai, Doi Phahompok NP, Doi Phaluang, 20°1.06'N, 99°9.581'E, 1449 m, Malaise trap, 14-21.x.2007, P. Wongchai leg., T6187"; "THAILAND Chiang Mai, Doi Phahompok NP, Doi Phaluang, 20°0.966'N, 99°9.579'E, 1449 m, Malaise trap, 7-14.viii.2007, Komwuan Srisom & Prasit Wongchai leg., T2850" (QSBG, USNM).

Discussion.

This species belongs to the tribe Cladiini , characterized by the forewing venation: vein M meeting Sc+R close to the point where Rs meets Sc+R and vein 2A+3A complete, fused with 1A at its center and forming a basal anal cell. For Cladiini , Benson recorded Priophorus nigricans (Cameron) and Pristiphora brullei Dahlbom from Myanmar, and Cladius pectinicornis (Geoffroy) from the Himalayas. All three have a narrow, well-sclerotized lancet with lateral teeth on the annuli, not the Trichiocampus -like saw as in Fig. 3 , which is broadly triangular, lacks annular spines or hairs, and has deep, rounded serrulae.

I refer the Thai specimens to Trichiocampus pruni because of their similarity to the description and illustrations of Trichiocampus pruni provided by Takeuchi (1956). The serrulae of the Thai specimens are slightly more asymmetric than those illustrated by Takeuchi, but other than this they appear identical. Trichiocampus pruni was described from the Kuriles and Japan (Hokkaido and Honshu) and has since been recorded in China ( Nie and Wei 2009), so it is not improbable that it could occur as far south as Thailand.

Nie and Wei (2009) included Trichiocampus pruni in their key to the Trichiocampus species of China. It is the only entirely black species they treat. In the key, two groups of Trichiocampus are distinguished in the first couplet, one with the fore- and hind basitarsomeres distinctly shorter than the three following tarsomeres together and the other with the fore- and hind basitarsomeres longer than the three following tarsomeres together. Trichiocampus pruni is included with those species with the fore and hind basitarsomeres "distinctly shorter" that the three following tarsomeres together. Takeuchi (1956) described the front basitarsomere about as long as the three following together, and in the Thai specimens, the fore and hind basitarsomeres are subequal to the length of the three following tarsomeres together; thus, the Thai specimens examined could not be keyed past couplet one in Nie and Wei (2009).

I consider Trichiocampus as a valid genus, following Smith (1974), Smith (1979), and Nie and Wei (2009). Trichiocampus pruni is therefore not a secondary homonym, and the replacement name Cladius takeuchii is unnecessary. Therefore I use Trichiocampus pruni as the valid name ( ICZN 1999, Article 59.4).

Figures

Figures 1 - 3. Trichiocampus pruni 1 Dorsolateral view; left line points to basal anal cell; right line to position of M joining Sc + R 2 Sheath and ovipositor 3 Lancet.