Lasius orientalis

Every Ant Tells a Story - And Scientists Explain Their Stories Here
Jump to navigation Jump to search
Lasius orientalis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Lasiini
Genus: Lasius
Species: L. orientalis
Binomial name
Lasius orientalis
Karavaiev, 1912

Lasius orientalis casent0280459 p 1 high.jpg

Lasius orientalis casent0280459 d 1 high.jpg

Specimen Labels


This species is a temporary parasite of Lasius flavus.

At a Glance • Temporary parasite  



Within the subgenus distinctive by its flattened antennal scape and the very thick, low petiolar scale (in profile), which is gradually widened to the apex when seen in front or from behind.

Keys including this Species


Radchenko (2005) - Southern part of Russian Far East (Amursky and Primorsky Regions, Islands Shikotan and Kunashir), Korean Peninsula, Japan (Hokkaido, northern and central Honshu).

Distribution based on Regional Taxon Lists

Palaearctic Region: Democratic Peoples Republic of Korea, Japan, Republic of Korea (type locality), Russian Federation.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb




The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • orientalis. Lasius fuliginosus var. orientalis Karavaiev, 1912b: 586 (w.) KOREA. Junior synonym of fuliginosus: Wilson, 1955a: 138; of nipponensis: Espadaler, Akino & Terayama, 2002: 340. Revived from synonymy, raised to species and senior synonym of ouchii, teranishii: Radchenko, 2005a: 87.
  • teranishii. Lasius (Chthonolasius) teranishii Wheeler, W.M. 1928d: 120 (q.) JAPAN. Yamauchi & Hayashida, 1968: 399 (w.m.). Combination in L. (Dendrolasius): Wilson, 1955a: 146. Senior synonym of ouchii: Wilson, 1955a: 146. Junior synonym of orientalis: Radchenko, 2005a: 87. See also: Yamauchi, 1979: 174; Kupyanskaya, 1989: 786.
  • ouchii. Lasius (Chthonolasius) ouchii Teranishi, 1940: 76 (q.) JAPAN. Junior synonym of teranishii: Morisita, 1945: 23; of orientalis: Radchenko: 2005: 87..

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.



Radchenko (2005) - (neotype in brackets) workers from the nest of the neotype specimen (n = 16) [mean data are in square brackets]: HL1 = 1.06-1.26 (1.22) [1.17], HL2 = 1.12-1.33 (1.32) [1.25], HW1 = 1.04-1.23 (1.19) [1.15], HW2 = 0.70-0.80 (0.77) [0.75], SL = 1.01-1.12 (1.09) [1.06], OL = 0.18-0.27 (0.25) [0.23], AL = 1.18-1.44 (1.34) [1.32]; CI = 0.96-1.00 (0.98) [0.98], CLI = 1.05-1.09 (1.08) [1.07], CWI = 1.49-1.57 (1.55) [1.54], SI1 = 0.88-0.95 (0.90) [0.90], SI2 = 0.89-0.96 (0.92) [0.92], OI = 0.18-0.22 (0.21) [0.20].

Petiolar scale (seen in proflle) thick, low, not narrowing to the top; when seen in front or from behind, it gradually widens to the top; scape distinctly flattened, ratio of min/max diameters of the scape ≤ 0.5; head with convex sides, gradually and slightly narrowing anteriorly, with emarginate occipital margin; scape and legs with numerous short subdecumbent hairs; promesonotal dorsum and occipital margin with a few quite short standing hairs.


Radchenko (2005) - Petiolar scale (seen in profile) thick, low, not narrowing to the top; when seen in front or from behind it gradually widens to the top; scape and legs, including the first tarsal joint, remarkably flattened, ratio of min/max diameters of scape and hind tibiae ≤ 0.4; head with emarginate occipital margin, but not cordiform and at most slightly wider than long; legs and scape with very dense decumbent pubescence; head, alitrunk and gaster with very dense decumbent pubescence; alitrunk dorsum with sparse, short erect hairs.

Type Material

Radchenko (2005) -Neotype worker (designated here, see below), “Buhta Gaidamak, No. 3196, 2l.V.1900, leg. P. Shmidt”, “Lasius fuliginosus var. orientalis Karaw. Typus” (both labels hand written by Karawajew) (Institute of Zoology of the Ukranian National Academy of Sciences).


  • Espadaler, X.; Akino, T.; Terayama, M. 2002 [2001]. Taxonomic status of the ant Lasius nipponensis Forel, 1912 (Hymenoptera, Formicidae). Nouv. Rev. Entomol. 18: 335-341 (page 340, Junior synonym of nipponensis)
  • Karavaiev, V. 1912b. Ameisen aus dem paläarktischen Faunengebiete. Rus. Entomol. Obozr. 12: 581-596 (page 586, worker described)
  • Radchenko, A. 2005a. A review of the ants of the genus Lasius Fabricius, 1804, subgenus Dendrolasius Ruzsky, 1912 (Hymenoptera: Formicidae) from East Palearctic. Annales Zoologici (Warszawa) 55(1):83-94. (page 87, status revived, new status; senior synonym of teranishii, and ouchii)
  • Wilson, E. O. 1955a. A monographic revision of the ant genus Lasius. Bull. Mus. Comp. Zool. 113: 1-201 (page 138, Junior synonym of fuliginosus)