Formica
Genus Formica Linne, 1758 Formica Linne, 1758: 579. Type-species: Formica rufa Linne, 1758 (Yarrow, 1954). Antennae 12 segmented in worker and female, 13 segmented in male; antennal insertions contiguous with clypeal border. Funiculus segments 2 to 5 longer than 6 to 10. Maxillary palps 6 segmented,...
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| Format: | Other/Unknown Material |
| Language: | unknown |
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1979
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| Online Access: | https://zenodo.org/record/6283876 https://doi.org/10.5281/zenodo.6283876 |
| Summary: | Genus Formica Linne, 1758 Formica Linne, 1758: 579. Type-species: Formica rufa Linne, 1758 (Yarrow, 1954). Antennae 12 segmented in worker and female, 13 segmented in male; antennal insertions contiguous with clypeal border. Funiculus segments 2 to 5 longer than 6 to 10. Maxillary palps 6 segmented, occasionally 5; labial palps 4 segmented. Ocelli distinct in all castes; frontal ridges diverging posteriorly; frontal triangle always very distinctly defined. Propodeal spiracle elliptical placed at some distance from propodeal border. Wings with cubital and one discoidal cell. Male external genitalia large and conspicuous. The species of this genus are relatively robust and active. Holarctic genus with over 150 species. There are at least 20 species known to occur in Fennoscandia; in some groups, notably F. rufa and its allies, species distinctions are not always clearcut necessitating the comparison of a number of specimens preferably with males and females as well as workers. Keys to species of Formica Workers 1 Bicoloured species: alitrunk red with varying amounts of dark brown to blackish patches. 2 Body colour evenly greyish or brownish black. 18 2(1) Anterior margin of clypeus emarginate or with distinct median notch (Fig. 222). 56. sanguinea Latreille Anterior margin of clypeus broadly rounded and entire. 3 3 (2) Head flattened posteriorly, with deeply concave occipital border. 4 Head evenly rounded posteriorly, occipital margin straight, convex or very weakly concave. 8 4 (3) Eyes with distinct microscopic hairs; maxillary palps longer than half head length (Figs. 201,212). 50. exsecta Nylander Eyes bare; maxillary palps half head length or shorter. 5 5(4) Occipital corners smoothly rounded; posterior emargination shallow, head not longer than maximum width across eyes; maxillary palps 6 segmented, as long as half head length (Fig. 213). 54. suecica Adlerz Occipital corners sharp; back of head deeply emarginate; maxillary palps often 5 segmented, shorter than half head length; head longer than broad 6 6 (5) ... |
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