Leptothorax oceanicus

This species inhabits mainly deciduous forests, but also it was found in meadows near lake shores, nests are built mostly in fallen logs, tree stumps, rarely in soil (Radchenko 2004).

Identification
Radchenko (2004) - L. oceanicus most resembles Leptothorax muscorum but differs from it mainly by the sharply triangular petiolar node with a very narrowly rounded dorsum, (in L. muscorum the petiolar node has a distinct, often rounded, dorsal plate) (for details see Radchenko & Heinze 1987).

Distribution
Radchenko (2004) - L. oceanicus seems to be a quite rare species and is known from several localities between 41–53° N and 125–135°E: Russia: Amursky Region, Zeya; Habarovsk; Primorsky Region: Vladivostok; Anisimovka; Borisovskoe plateau; Suputinsky Natural Reserve; North-East China: Jilin Province; North Korea: Ryanggang Province.

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

Nomenclature

 *  oceanicus. Mychothorax muscorum subsp. oceanicum Kuznetsov-Ugamsky, 1928b: 29 (w.) RUSSIA. Kupyanskaya, 1990: 140 (q.). Combination in Leptothorax: Kupyanskaya, 1990: 140. Raised to species: Heinze, Schulz & Radchenko, 1993: 178; Radchenko, 1994d: 147 (in key). See also: Radchenko & Heinze, 1997: 79.

Type Material
Radchenko (2004) - Russia, Primorsky Region, Ussuri Distr., station Okeanskaya. Neotype worker: Suputinsky Natural Reserve, valley of the riv. Maykha, 25.v.1967, leg. A. Tichomirova ; non-type material: 16 workers.

References based on Global Ant Biodiversity Informatics

 * Lelej A. S. 2012. Annotated catalogue of the Insects of Russian Far East. Volume 1. Hymenoptera. Dalnauka: Vladivostok. 635 p.
 * Radchenko A. 2004. A review of the ant genera Leptothorax Mayr and Temnothorax Mayr (Hymenoptera, Formicidae) of the eastern Palaearctic. Acta Zoologica Academiae Scientiarum Hungaricae 50:109-137.
 * Radchenko A.G., and J. Heinze. 1997.  A redescription of the ant Leptothorax oceanicus (Hymenoptera, Formicidae). Vestnik Zoologii. 31(4): 78-81.
 * Radchenko, A. 2005. Monographic revision of the ants (Hymenoptera, Formicidae) of North Korea. Annales Zoologici 55(2): 127-221.