Lasius americanus

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Lasius americanus
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. americanus
Binomial name
Lasius americanus
Emery, 1893

Lasius alienus casent0005401 profile 1.jpg

Lasius alienus casent0005401 dorsal 1.jpg

Specimen labels

This North American species is commonly collected and widespread. They are primarily found in forest habitats but will occasionally occur in bogs and other wetlands. Nests are in soil, in and under rotten logs and stumps, and sometimes in deep leaf litter. (Ellison et al., 2012). This species has only recently (Schär et al. 2018) been recognized as distinct and separate from the morphologically similar Paleoarctic Lasius alienus. North American studies that refer to L. alienus, provided the authors correctly identified this ant, are records of L. americanus.


Photo Gallery

  • Worker. Photo by Tom Murray.
  • Worker. Photo by Tom Murray.

Identification

Mackay and Mackay (2002) - This is a small, dark brown or black species with relatively large eyes (12-14 ommatidia in maximum diameter). The scape has few (less than 5) or no erect hairs (except at apex). The penultimate tooth is about the same size as the adjacent teeth (other 2 basal teeth).

Ellison et al., (2012) - In New England, the large-eyed Lasius americanus can be confused with either of the other three species in the niger group: Lasius pallitarsis, Lasius neoniger, or Lasius niger. The key feature is that L. americanus lacks erect hairs on its scape and hind tibiae, and is more common in forested habitats. The other three species all have erect hairs on their scapes and hind tibiae, and are more common in open habitats.

Keys including this Species

Distribution

This North American species is found from southern British Columbia west to Nova Scotia, south to northern Florida and in the mountains of the southwestern United States and Mexico (Ellison et al., 2012).

Latitudinal Distribution Pattern

Latitudinal Range: 57.03143° to 23.77°.

   
North
Temperate
North
Subtropical
Tropical South
Subtropical
South
Temperate

Distribution based on Regional Taxon Lists

Nearctic Region: Canada, United States (type locality).
Neotropical Region: Mexico.

Distribution based on AntMaps

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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.
pChart

Biology

Wilson (1955) - Over its entire range, this species shows a strong predilection for well shaded woodland, where it nests in rotting logs and stumps and under stones. Among the hundreds of colonies I have encountered in the field in the eastern United States, nearly all conformed to this ecological character. It may happen, however, that at high elevations or at the northern periphery of its range, the species occasionally nests in open situations. At the summit of Grandfather Mountain in North Carolina, for instance, I found a small but vigorous population living under stones in an open blueberry-and-heath "bald". The elevation was 5800 feet, higher by 700 feet than any other collection of the genus made in the course of several field trips in the southern Appalachians.

This species is replaced in nearly every available habitat except woodland by the equally successful and abundant members of the Lasius neoniger complex. Lasius pallitarsis occupies the same types of nesting sites as americanus and probably limits its northward spread. In general, one gains the impression that americanus has been squeezed into relatively narrow ecological ranges by its congeneric competitors, but is nevertheless eminently successful within those ranges.

Records of nuptial flights in this species are too sparse to allow a rigorous comparison with other species, with records ranging from May 30 (Decatur Co., Ga.) to December 4 (Alachua Co., Fla.). Both of these are very exceptional dates, however; the majority of the other records fall in August.

Wheeler 1906. Figure 3. Nest of Lasius americanus under stone. The stone has been removed, showing a prostrate plant-stem along which the ants have constructed an irregular gallery. An aphis tent of vegetable detritus is shown on the left-hand side of the figure where the plant-stem rose from under the stone.

Wheeler 1906 - Lasius americanus occasionally builds detritus tents around the stems of plants. One of these which I found during the past summer at Colebrook, Connecticut, is represented in Fig. 3. A small colony of anericanus, nesting under a flat stone, was keeping aphides on a prostrate stem along which a broad and very irregular gallery had been excavated. Around the stem at the point where it emerged from under the stone, the ants had woven a cylindrical tube of fine vegetable detritus about iinches in length and closed at the outer end, as if to prevent the aphides from escaping from the nest.

Regional Notes

New England

Ellison et al. (2012) - This omnivorous species collects elaiosomes from seeds, live insects and carcasses of dead ones, and tends a wide variety of aphids, scales, and treehoppers, and coccids that feed on plant roots. The colonies can be very large and have many queens, but individual queens disperse and found colonies independently.

Association with Other Organisms

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Other Insects

Nematode

  • This species is a host for the nematode Allomermis (sensu Cobb) (a parasite) in Massachusetts, United States (Wheeler, 1928; Laciny, 2021).

Castes

Worker

Mcz-ent00520085-Lasius-alienus-worker-hef.jpgMcz-ent00520085-Lasius-alienus-worker-hal.jpgMcz-ent00520085-Lasius-alienus-worker-had.jpgMcz-ent00520085 Lasius alienus worker lbs.jpg
. Owned by Museum of Comparative Zoology.

Images from AntWeb

Lasius alienus casent0102801 head 1.jpgLasius alienus casent0102801 profile 1.jpgLasius alienus casent0102801 dorsal 1.jpgLasius alienus casent0102801 label 1.jpg
Worker. Specimen code casent0102801. Photographer Jen Fogarty, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.
Lasius alienus casent0103987 head 1.jpgLasius alienus casent0103987 profile 1.jpgLasius alienus casent0103987 dorsal 1.jpgLasius alienus casent0103987 label 1.jpg
Worker. Specimen code casent0103987. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by ABS, Lake Placid, FL, USA.

Queen

Images from AntWeb

Lasius alienus casent0103986 head 1.jpgLasius alienus casent0103986 profile 1.jpgLasius alienus casent0103986 dorsal 1.jpgLasius alienus casent0103986 label 1.jpg
Queen (alate/dealate). Specimen code casent0103986. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by ABS, Lake Placid, FL, USA.
Mcz-ent00520088-Lasius-alienus-queen-hef.jpgMcz-ent00520088-Lasius-alienus-queen-hal.jpgMcz-ent00520088-Lasius-alienus-queen-had.jpgMcz-ent00520088 Lasius alienus queen lbs.jpg
.

Male

Mcz-ent00520080-Lasius-alienus-male-hef.jpgMcz-ent00520080-Lasius-alienus-male-hal.jpgMcz-ent00520080-Lasius-alienus-male-had.jpgMcz-ent00520080-Lasius-alienus-lbs.jpg
. Owned by Museum of Comparative Zoology.

Nomenclature

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

  • americanus. Lasius niger var. americanus Emery, 1893i: 639 (w.q.m.) U.S.A.
    • Wheeler, G.C. & Wheeler, J. 1953c: 147 (l.).
    • As unavailable (infrasubspecific) name: Wheeler, W.M. 1916k: 172; Wheeler, W.M. 1917a: 525; Wheeler, W.M. 1917i: 463; Emery, 1925b: 230; Essig, 1926: 866; Smith, M.R. 1930a: 5; Menozzi, 1932b: 311; Smith, M.R. 1951a: 850.
    • Subspecies of niger: Forel, 1900e: 285; Wheeler, W.M. 1904e: 305; Wheeler, W.M. 1905f: 393; Wheeler, W.M. 1906b: 12; Wheeler, W.M. 1906d: 343; Wheeler, W.M. 1908f: 623; Wheeler, W.M. 1910g: 569; Santschi, 1911d: 7; Wheeler, W.M. 1913c: 116; Wheeler, W.M. 1916m: 592; Cole, 1936a: 37; Dennis, 1938: 295; Wing, 1939: 164; Cole, 1942: 374; Buren, 1944a: 296; Wheeler, G.C. & Wheeler, E.W. 1944: 253.
    • Subspecies of alienus: Creighton, 1950a: 419.
    • Junior synonym of alienus: Wilson, 1955a: 77; Smith, D.R. 1979: 1435.
    • Status as species: Gregg, E.V. 1945: 530; Schar et al., 2018: 6.

Taxonomic Notes

Schar et al. (2018) - Lasius americanus Emery, 1893 was originally described as a subspecies of Lasius niger, and was then raised to species in 1945 by Gregg. Creighton (1950) treated it as a subspecies of Lasius alienus, and then Wilson (1955) finally placed it in synonymy with Lasius alienus. Our results support the species-level status of this taxon as suggested by Gregg (1945). Therefore Lasius americanus is removed from synonymy with Lasius alienus and treated as a full species.

Description

References

References based on Global Ant Biodiversity Informatics

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