Lasius koreanus

The only natural history information known about L. koreanus is that alates were collected between 6 and 23 August.

Identification
Seifert (2020) – The combination of small size, short scape, large eyes and particular microsculpture, L. koreanus should not be confused with any other species.

Distribution based on Regional Taxon Lists
Palaearctic Region: Democratic Peoples Republic of Korea, Republic of Korea, Russian Federation.

Nomenclature

 *  koreanus. Lasius (Lasius) koreanus Seifert, 1992b: 47, fig. 39 (w.q.) KOREA.

Worker
Small size (CS 819 µm). Head moderately elongated and scape shorter than in other East Asian species (CL/ CW900 1.085, SL/CS900 0.956). Postocular distance rather small and eye rather large (PoOc/CL900 0.236, EYE/ CS900 0.252). Torulo-clypeal distance small (dClAn900 4.38). Terminal segment of maxillary palp long (MP6/ CS900 0.201). Pubescence on clypeus moderately dense (sqPDCL900 4.57); frontal pubescence rather short (PLF900 27.0). Gular and pronotal setae of medium length (GuHL/ CS900 0.103, PnHL/CS900 0.137); overall setae numbers rather low (nOcc900 11.9, nGen900 1.1, nGu900 4.9, nSc900 2.6, nHT900 13.0, nSt900 4.8). Microsculpture on head and mesosoma more strongly developed than in other species. Microsculpture between the frontal carinae rather deep, with the margins of meshes developed as elevated ridges and their inner part developed as a rather deep foveola which centrally carries the base of a pubescence hair; short fragments of microcarinulae are irregularly dispersed over the surface. Lateral metapleuron and lower lateral propodeum densely longitudinally carinulate. Coloration: variable; head brown to dark reddish brown, mesosoma medium brown to light reddish brown, gaster varying between dark reddish brown and blackish brown.

See table 10 in Seifert 2020 for additional morphometrics. The abbreviations shown above with the quantitative data are defined here: Seifert 2020 Lasius characters.

Type Material
Holotype worker labelled ”Korea, Kaesong, Mts. Pakyon, 20 km NE from Kaesong, 30. Sept. 1971.“, ”No 254, leg. S. Horvatovich et J. Papp“; 5 paratype workers on separate pins labelled ”North Korea Paekdusan 1.-18.8. 1989 Kozánek lgt.“; depository.

References based on Global Ant Biodiversity Informatics

 * Guénard B., and R. R. Dunn. 2012. A checklist of the ants of China. Zootaxa 3558: 1-77.
 * Lelej A. S. 2012. Annotated catalogue of the Insects of Russian Far East. Volume 1. Hymenoptera. Dalnauka: Vladivostok. 635 p.
 * Radchenko, A. 2005. Monographic revision of the ants (Hymenoptera: Formicidae) of North Korea. Annales Zoologici (Warsaw) 55: 127-221.
 * Radchenko, A. 2005. Monographic revision of the ants (Hymenoptera, Formicidae) of North Korea. Annales Zoologici 55(2): 127-221.
 * Seifert B. 1992. A taxonomic revision of the Palaearctic members of the ant subgenus Lasius s.str. (Hymenoptera: Formicidae). Abhandlungen und Berichte des Naturkundemuseums Görlitz 66(5): 1-67.