Lasius talpa

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Lasius talpa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Lasiini
Genus: Lasius
Species: L. talpa
Binomial name
Lasius talpa
Wilson, 1955

Lasius talpa casent0903665 p 1 high.jpg

Lasius talpa casent0903665 d 1 high.jpg

Specimen Labels

Common Name
Hime-kiiro-ke-ari
Language: Japanese

This forest species has its nuptial flights during August and September in Japan (Japanese Ant Image Database).

Identification

Best distinguished by its very hairy, small-eyed worker caste.

Keys including this Species

Distribution

Like Lasius sonobei, this species is commonly found in the forests of southern Japan, but it is rare in the Tohoku district. The northernmost distribution record is from Sendai, Miyagi Prefecture (Japanese Ant Image Database).

Distribution based on Regional Taxon Lists

Oriental Region: India, Pakistan.
Palaearctic Region: Democratic Peoples Republic of Korea, Japan (type locality), Republic of Korea.

It is also found in the Republic of Korea and China.


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Dr. W. L. Brown has supplied me with field notes on his Chinese collection. Miao T'ai Tze is located in the Tsinling Shan at an elevation of over 6000 feet. The colony was situated in a small rotting stump on a steep slope in moist, mixed fir-hardwood forest (Liquidambar, Acer, and bamboos prominent) about 200 feet above the town. A large colony of Lasius flavus was found under a stone about 400 feet higher in a forest clearing. It is conceivable that Lasius talpa is the ecological equivalent of the North American species Lasius nearcticus in that it may tend to replace flavus in moister, more densely wooded situations. (Wilson 1955)

Flight Period

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

Castes

Nomenclature

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

  • talpa. Lasius (Cautolasius) talpa Wilson, 1955a: 136 (w.q.m.) JAPAN. Imai, 1966: 119 (k.). See also: Yamauchi, 1997: 162; Collingwood, 1982: 291.

Type Material

  • Holotype, worker, Hirooka, Shikoku, Japan, July 23, 1946, H. Okamoto, Okamoto Collection.
  • Paratype, workers, queen, male, Hirooka, Shikoku, Japan, July 23, 1946, H. Okamoto, Okamoto Collection, Museum of Comparative Zoology.

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

Description

Worker

(1) Monomorphic to feebly polymorphic. Head shape similar to Lasius nearcticus, sub quadrate with widely spaced mandibles.

(2). Eyes very small, usually with only 6-12 ommatidia and a recorded maximum of 17 (Miao T'ai Tze).

(3) Numerous erect hairs on the scape along the plane of count standing out above the combined ground pubescence and subdecumbent to erect hairs of intermediate length. Standing hairs also abundant on the tibiae. Standing body pilosity in general denser than in other Cautolasius.

PW range 0.38-0.60 mm.; maximum intranidal PW range 0.38-0.51 mm. (Yasu) and 0.50-0.60 mm. (Hirooka III-8-1936). SI-HW regression zone high, at lower limit of northern Eurasian Lasius flavus zone (q.v.) and below that of nearcticus. Dentition similar in variation to that of flavus of comparable size; typically two basal teeth and occasionally a third intercalary one; the second intercalary tooth .often dropping out. Terminal segments of maxillary palp apparently varying as in Lasius fallax. The Hirooka III-8-1936 series contains some workers with VI equalling V and some with VI exceeding V, while all of the Yasu workers have VI exceeding V. Petiole always showing some degree of emargination, although this tends to be feeble in small specimens. Cephalic pubescence as dense as in extreme nearcticus. Body and appendages uniformly medium yellow.

Queen

(1) Best distinguished from other Cautolasius species by the presence of numerous standing hairs on the scape.

(2) Possibly averaging smaller than other Cautolasius species: three queens from the holotype nest series have HW's of 1.33, 1.35, and 1.35 mm. respectively.

(3) Body uniformly light brown, overall lighter than in other members of the subgenus.

Male

Lacking a dependable pilosity character; at most two or three erect hairs can be seen on the outer femoral surfaces, a condition probably overlapped by nearcticus. The mandibles may have a distinctive shape: the one perfect specimen I have examined, from the holotype nest series, had the masticatory border smooth, concave, and terminating in a sharply angular basal corner, which condition has been encountered elsewhere only in the highly variable flavus mandible.

Parameres and volsellae resembling those of other Cautolasius. Subgenital plate sub quadrate, with a single prominent posterior setiferous lobe; posterolateral flanges drawn out laterally and very thin and acute.

Karyotype

  • 2n = 30 (Japan) (Imai & Yosida, 1964; Imai, 1966; Imai, 1969).

References

  • Collingwood, C. A. 1982. Himalayan ants of the genus Lasius (Hymenoptera: Formicidae). Syst. Entomol. 7: 283-296 (page 291, see also)
  • Imai, H. T. 1966b. The chromosome observation techniques of ants and the chromosomes of Formicinae and Myrmicinae. Acta Hymenopterol. 2: 119-131 (page 119, karyotype described)
  • Wilson, E. O. 1955a. A monographic revision of the ant genus Lasius. Bull. Mus. Comp. Zool. 113: 1-201 (page 136, worker, queen, male described)
  • Yamauchi, K. 1979 [1978]. Taxonomical and ecological studies on the ant genus Lasius in Japan (Hymenoptera: Formicidae). I. Taxonomy. Sci. Rep. Fac. Educ. Gifu Univ. (Nat. Sci.) 6: 147-181 (page 162, see also)

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