Sirex mongolorum

Taxonomy

Family: Siricidae
Subfamily: Siricinae
Genus: Sirex Linnaeus, 1760
Species: Sirex mongolorum (Semenov & Gussakovskij, 1935)
Common names: none

Background

Sirex mongolorum is a rare, completely dark species that is known only from Mongolia and eastern Russia (Smith 1978).

Diagnostic characteristics

See Sirex for genus-level diagnostic characteristics.

The following characters are taken from the short, original description written in Latin. It was difficult to translate, and the translating authors and subsequent researchers have been unable to confirm their accuracy.

Females:

Male S. mongolorum is unknown.

May be confused with

The female Sirex mongolorum can be distinguished from S. imperialis by the mostly light-colored legs (Benson 1943). The third antennal segment is relatively longer in S. mongolorum than in S. ermak and S. noctilio (Semenov and Gussakovskij 1935).

Morphological and geographical variation

none recorded

Host associations

Sirex species feed on trees of Pinaceae and Cupressaceae. Sirex mongolorum is known from Picea spp. (spruce), Larix sibirica (Siberian larch), Larix (larch), Pinus pinea (stone pine), and Pinus spp. (pine) (Smith 1978).

Life history

Female Sirex harbor symbiotic basidiomycete fungus in abdominal glands called mycangia. During oviposition, the site is inoculated with the fungus (Amylostereum spp.), which begins to decompose the surrounding wood. Larvae feed on the fungus, and in the process bore galleries through the wood (Schiff et al. 2012).

Larvae are creamy white and grub-like in appearance with a dark head capsule. As with adults, larvae possess a short dorsal horn on the posterior end of the body. The larvae bore galleries into wood, feeding until pupation and subsequent emergence. Throughout this process, the larvae use their horn to pack the tunnel behind them with sawdust. Emergence holes are perfectly circular. The fungal symbiont is carried in specialized organs in female larvae that develop into the mycangia after metamorphosis (Schiff et al. 2012).

The specific biology of S. mongolorum is unknown.

Distribution

World: Sirex mongolorum is recorded in the mountains of Kentii, Mongolia and the city of Chita in eastern Russia (Semenov and Gussakovskij 1935, Smith 1978).

North America: not recorded

Map data from: GBIF.org (26 June 2019) GBIF Occurrence Download Sirex mongolorum

Details about data used for maps can be found here.

Specimens of this species not available for imaging.