Lasius hayashi

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Lasius hayashi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Lasiini
Genus: Lasius
Section: niger clade
Species group: niger
Species: L. hayashi
Binomial name
Lasius hayashi
Yamauchi & Hayashida, 1970

Lasius hayashi casent0280448 p 1 high.jpg

Lasius hayashi casent0280448 d 1 high.jpg

Specimen Labels


Common Name
Hayashi-ke-ari
Language: Japanese

This species nests in dead portions of tree trunks, especially at or near the roots. Nuptial flights occur in July and August (Japanese Ant Image Database).

Identification

Japanese Ant Image Database - Total length of workers around 2 - 4 mm. Head and mesosoma light brown, gaster dark brown. Antennal scapes usually slightly shorter than the head width, and with erect hairs. Petiole high, its tip acutely angulate; anterior margin of petiolar scale not angulate.

Seifert (2020) - Lasius hayashi is separable from the sympatric and similarly hirsute Lasius japonicus by its broader head, shorter scape, more convex petiole sides and a homogenously yellowish brown head capsule.

Keys including this Species

Distribution

Upper-altitudinal occurence records: 600 m at 44°N in Hokkaido and 1600 m at 34°N in Shikoku.

Latitudinal Distribution Pattern

Latitudinal Range: 44° to 30.359°.

   
North
Temperate
North
Subtropical
Tropical South
Subtropical
South
Temperate

Distribution based on Regional Taxon Lists

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

Distribution based on AntMaps

AntMapLegend.png

Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

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Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.

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Biology

Seifert 2020, summarizing Yamauchi 1979 and Yamauchi, Ito, Suzuki 1986 - Main habitat is shady deciduous woodland with large trees. The nests are mostly constructed within the root systems or in hollow trunks of trees and sometimes in rotten logs and may contain carton structures. Being active in Sapporo to mid November, L. hayashi has a longer foraging season than sympatric congeneric species. The foraging paths are almost completely covered by macerated plant and humus material both on tree trunks and on the ground near the tree where trophobiotic Homoptera are tended. Flights were observed from early July to late August and start in the late evening at light intensities of only 0–10 lux and air temperatures of 22– 24°C. Air movements and rain stop the flight.

Association with Other Organisms

This species is a host for the ant Lasius meridionalis (a temporary parasite).

Flight Period

X X
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

 Notes: Japan.

Castes

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • hayashi. Lasius hayashi Yamauchi & Hayashida, 1970: 510, figs. 1, 5, 7, 8, 11 (w.q.m.) JAPAN. See also: Collingwood, 1976: 305; Yamauchi, 1979: 158; Kupyanskaya, 1990: 220; Seifert, 1992b: 45.

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

Description

Worker

Seifert (2020) - Large (CS 994 µm). Head shorter than in other sympatric species (CL/CW900 1.049) and usually with concave posterior margin. Scape rather short (SL/CS900 0.978). Postocular distance medium and eye rather small (PoOc/ CL900 0.241, EYE/CS900 0.230). Torulo-clypeal distance rather large (dClAn900 5.07). Number of mandibular dents rather low (MaDe 7.95). Terminal segment of maxillary palp rather long (MP6/CS900 0.194). Pubescence on clypeus moderately dense (sqPDCL900 4.59); on frons rather short (PLF900 28.4); on scape subdecumbent to suberect and difficult to distinguish from shorter setae; on hind tibia decumbent to appressed, contrasting the situation in the long, suberect to erect setae. Gular and pronotal setae long (GuHL/CS900 0.114, PnHL/CS900 0.154). Whole body covered by numerous standing setae (nOcc900 13.1, nGen900 5.1, nGu900 6.4, nSc900 18.3, nHT900 17.4, nSt900 4.9). Coloration: mesosoma, petiole, scape, femora and tibiae pale yellowish brown, head darker yellowish brown, gaster blackish brown or dark brown with yellowish tinge.

See table 11 in Seifert 2020 for additional morphometrics. The abbreviated names of various quantitative data shown above are defined here: Seifert 2020 Lasius characters.

Type Material

Seifert (2020) - One paratype worker from the holotype nest series labelled ”Sapporo Hokkaido 27-VII-1967 K. Yamauchi“; depository Staatliches Museum für Naturkunde Görlitz.

References

References based on Global Ant Biodiversity Informatics

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