Lasius fuji

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Lasius fuji
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Lasiini
Genus: Lasius
Species: L. fuji
Binomial name
Lasius fuji
Radchenko, 2005

Presuming this species is much like its sister-species Lasius fuliginosus, a species that it was long lumped with, its biology is much like this other species.

Identification

Radchenko (2005) –

L. fuji worker Lasius fuliginosus worker
head usually somewhat longer than wide (CI 0.95-1.01 ); head length equal to or less than its width (CI 1.00-1.03);
scape relatively longer (SI2 0.88-0.95); scape relatively shorter (SI2 0.82-0.89);
standing hairs on the upper margin of petiolar scale longer, the longest hairs distinctly longer than the half of the maximum diameter of the scape; standing hairs on the upper margin of petiolar scale shorter, the longest hairs shorter than the half of the maximum diameter of the scape;
decumbent pubescence on the anterior (vertical) surface of first gastral tergite relatively dense, distance between hairs distinctly shorter than the hairs length decumbent pubescence on the anterior (vertical) surface of first gastral tergite relatively sparse, distance between hairs not shorter (usually longer) than the hairs length
Queen - eyes with somewhat longer hairs, length of the longest ones ≥ 0.040 mm Queen - eyes with somewhat shorter hairs, length of the longest ones ≤ 0.035 mm

Keys including this Species

Distribution

Radchenko (2005) - Russian Far East (Amursky, Khabarovsky and Primorsky Regions, Isl. Sakhalin, Southern Kurily Islands), north-eastern China, Korean Peninsula, Japan (all four main Islands); it is the most common ‘’Dendrolasius’’ species in this area.

Distribution based on Regional Taxon Lists

Palaearctic Region: Democratic Peoples Republic of Korea, Mongolia, Russian Federation.

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Biology

Castes

Queen

Nomenclature

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

  • fuji. Lasius (Dendrolasius) fuji Radchenko, 2005a: 91, figs. 52-65 (w.q.) NORTH KOREA.

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

This species is what was considered the eastern form of Lasius fuliginosus.

Description

Worker

Type specimens (the holotype in brackets) [mean in square brackets] HL1 = 1.19-1.43 (1.41) [1.33); HL2 = 1.29-1.51 (1.51) [1.42], HW1 = 1.18-1.43 (1.43) [1.32], HW2 = 0.71-0.95 (0.92) [0.82], SL = 1.08-1.27 (1.27) [1.19), OL = 0.24-0.28 (0.28) [0.26], AL = 1.50- 1.68 (1.68) [1.57] mm; CI = 0.95-1.01 (1.01) [0.99], CLI = 1.06-1.10 (1.07) [1.07], CWI = 1.53-1.57 (1.55) [1.60], SI1 = 0.86-0.92 (0.90) [0.89], SI2 = 0.88-0.93 (0.89) [0.90], OI = 0.18-0.21 (0.20) [0.19].

Petiolar scale (seen in profile) relatively thick, not flattened at the top, approximately inversely U -shaped; when seen in front or from behind, it is only slightly narrowing to the dorsal crest; head with convex sides, gradually and slightly narrowing anteriorly, and with distinctly 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 relatively short and abundant standing hairs.

Since all three castes of “oriental fuliginosus” were described and characterised comprehensively several times by different authors (Wilson 1955; Yamauchi 1978; Kupyanskaya 1989, 1990; Espadaler et al. 2001; Imai et al. 2003), I do not provide a formal description.

Queen

[mean in square brackets] HL1 = 1.36-1.40 [1.38]; HL2 = 1.44-1.50 [1.47], HW1 = 1.40-1.46 [1.42], HW2 = 0.83-0.87 [0.84], SL = 1.26-1.27 [1.265], OL = 0.34-0.36 [0.345], AL = 1.90-2.04 [1.97] mm; CI = 1.03-1.04 [1.033], CLI = 1.06-1.07 [1.066], CWI = 1.68-1.70 [1.69], SI1 = 0.91-0.93 [0.92], SI2 = 0.88-0.90 [0.89], OI = 0.24-0.25 [0.243].

Petiolar scale (seen in profile) relatively thick, not flattened at the top, approximately inversely U-shaped; head with convex sides, gradually and slightly narrowing anteriorly, and with distinctly emarginate occipital margin; scape, mid and hind tibiae not flattened, elliptical in cross-section; ratio of min/max diameters of the scape > 0.7; legs and scape with dense decumbent pubescence only; head, alitrunk and gaster with abundant, but not very long standing hairs, and with well-developed decumbent pubescence.

Type Material

Holotype, worker, North Korea, Prov. Chagang, Myohyang-san Mts., way to Pirobong, No. 275-85, 25.VI.l985, leg. M. Woyciechowski (Institute of Zoology of the Ukranian National Academy of Sciences); paratypes: 15 workers, 6 queens from the same nest as the holotype.

Etymology

The species is named after Fuji-san Mt., one of the greatest symbols of Japan.

References