Lasius nigrescens

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Lasius nigrescens
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Lasiini
Genus: Lasius
Species: L. nigrescens
Binomial name
Lasius nigrescens
Stitz, 1930

Lasius nigrescens antweb1008433 p 1 high.jpg

This species is only known from the alate gynes of the type series.

Identification

Seifert (2020) - The type series of gynes is the only collection of L. nigrescens. Considering the correlations that usually exist between gyne and worker morphology in Lasius, the worker of this species is expected to have a long scape (SL/CS900 perhaps 1.06), an average head length index (CL/CW900 perhaps 1.07), and numerous setae on underside of head and hind tibiae.

Distribution

Distribution based on Regional Taxon Lists

Palaearctic Region: Russian Federation (type locality).


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.

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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

Castes

Queen

Nomenclature

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

  • nigrescens. Lasius emarginatus var. nigrescens Stitz, 1930: 240 (q.) RUSSIA. Junior synonym of niger: Wilson, 1955a: 60. Revived from synonymy and raised to species: Seifert, 1992b: 38.

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

Description

Queen

Seifert (2020) - I present here the data of 5 type gynes: CS 1411 ± 17 [1392, 1432]; CL/ CW 0.883 ± 0.010 [0.872, 0.896]; SL/CS 0.870 ± 0.010 [0.856, 0.879]; nGu 32.0 ± 5.6 [27, 40], nOcc 29.1 ± 1.6 [27, 31]; nGen 15.2 ± 4.2 [12.5, 20.0]; GuHL/CS 0.112 ± 0.005 [0.107, 0.16]; PnHL/CS 0.147 ±0.005 [0.143, 0.152]; sqPDCL 4.68 ± 0.17 [4.49, 4.89]; ML/CS 2.168 ± 0.036 [2.130, 2.223]; MH/CS 1.146 ± 0.026 [1.122, 1.189]; MW/ CS 1.329 ± 0.006 [1.322, 1.333].

The abbreviated names of various quantitative data shown above are defined here: Seifert 2020 Lasius characters.

Type Material

Seifert (2020) - Lectotype (des. E.O. Wilson) and 4 paralectotype gynes labelled ”West-Pamir, VII-IX 28, leg. Reinig, Maz, 3800 m, 15.-19. VIII“; depository Berlin Museum für Naturkunde der Humboldt-Universität.

References