Radchenko (2005) - Workers: petiolar scale (seen in profile) relatively thin, though not flattened at the top, approximately inversely V-shaped; when seen in front or from behind, it is slightly narrowing, not tapering to the dorsal crest; head with convex sides, gradually and slightly narrowing anteriorly, with rather shallowly emarginate occipital margin; scape, mid and hind tibiae not flattened, elliptical in cross-section; ratio of min/max diameters of the scape > 0.7; scape and legs with decumbent pilosity only; promesonotal dorsum and occipital margin with short and sparse standing hairs; third joint of maxillary palps is the longest, each following joint is somewhat longer than the next one; The combination of these features distinctly separates this species both from Lasius nipponensis and Lasius fuji.
Lasius capitatus seems the most similar to Lasius morisitai by the shape of the petiolar scale and by the short standing hairs on alitrunk and head, but workers of the latter species have a somewhat transversal head, which is wider than long (CI ≤ 1.00 in type specimens of L. capitatus and ≥ 1.04 in L. morisitai); these species also differ by the presence of short but distinct subdecumbent hairs on the scape of L. capitatus, while scape of L. morisitai has dense decumbent pubescence only.
Keys including this Species
- Key to Lasius Dendrolasius queens of the East Palaearctic
- Key to Lasius Dendrolasius workers of the East Palaearctic
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
Check data from AntWeb
Known only from the worker caste.
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- capitatus. Acanthomyops fuliginosus subsp. capitatus Kuznetsov-Ugamsky, 1927e: 187 (w.) RUSSIA. [Also described as new by Kuznetsov-Ugamsky, 1928b: 18.] Combination in Lasius: Wilson, 1955a: 138. Junior synonym of fuliginosus: Wilson, 1955a: 138. Revived from synonymy and raised to species: Kupyanskaya, 1989: 785. See also: Radchenko, 2005a: 85.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Radchenko (2005) - Type specimens (data of the lectotype are in brackets): HL1 = 1.25-1.29 (1.29), HL2 = 1.32-1.36 (1.36), HW1 = 1.22-1.27 (1.27), HW2 = 0.78-0.85 (0.85), SL = 1.11-1.12 (1.12), OL = 0.24-0.27 (0.27), AL = 1.34-1.44 (1.44); CI = 0.97-1.00 (0.99), CLI = 1.05-1.07 (1.05), CWI = 1.49-1.59 (1.49), SI1 = 0.87-0.89 (0.87), SI2 = 0.89-0.92 (0.88), OI = 0.19-0.21 (0.21).
Radchenko (2005) – Lectotype worker, “Okeanskaya nr. Vladivostok, Siberia, VIII-1926, N. Kusnetzov” (probably hand written by Wilson); “Lasius Juliginosus capitatus Kusnetzov LECTOTYPE” (hand written by Wilson); “M.C.Z. Type 30143” (MCZ, designated by Wilson, 1955); paralectotype worker, “Okeanskaya nr. Vladivostok, Siberia, VIII-1926, N. Kusnetzov” (hand written by Wilson); “Turkestan N. Kusnetzov” (Sic!) (printed original label from Kusnetzov's collection); “Lectotype nest series” (hand written by Wilson); “Cotype” (red printed label); “Lasius Juliginosus capitatus Kuzn.-Ugams. det. E. 0. Wilson” (hand written by Wilson); “M.C.Z. Type 30143”; paralectotype worker, “Acanthomyops fuliginosus orientalis (= capitatus m.) Far East Station Okeanskaya near Vladivostok”' (probably hand written by Kusnetzov); “Turkestan N. Kusnetzov” (Sic!) (original printed label from Kusnetzov's collection); “Lectotype nest series” (hand written by Wilson); “Cotype” (red printed label); “M.C.Z. Type 30143” (MCZ). Non-type material: 5 workers from the Russian Far East (IZK, BPI).
Labels of paralectotype specimens are misleading for the presence of the labels “Turkestan N. Kusnetzov” together with the locality “Far East Station Okeanskaya near Vladivostok”. Probably it is simply a labelling error in Kusnetzov's collection.
- Kupyanskaya, A. N. 1989. Ants of the subgenus Dendrolasius Ruzsky, 1912 (Hymenoptera, Formicidae, genus Lisius [sic] Fabricius, 1804) of the Far Eastern USSR. Entomol. Obozr. 68: 779-789 (page 785, Revived from synonymy, raised to species and senior synonym of crispus Wilson)
- Kuznetsov-Ugamsky, N. N. 1927e. Contributions to the knowledge of the myrmecology of Turkestan. III. Rus. Entomol. Obozr. 21: 186-196 (page 187, worker described)
- Kuznetsov-Ugamsky, N. N. 1928b. Ants of the South Ussuri Region. Zap. Vladivost. Otd. Gos. Rus. Geogr. Obshch. 1(1 18: 1-47 (page 18, also described as new)
- 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. 55(1):83-94. PDF (page 86, worker diagnosis)
- Wilson, E. O. 1955a. A monographic revision of the ant genus Lasius. Bull. Mus. Comp. Zool. 113: 1-201 (page 138, Combination in Lasius, Junior synonym of fuliginosus)