Strumigenys crassicornis

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Strumigenys crassicornis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. crassicornis
Binomial name
Strumigenys crassicornis
Mayr, 1887

Pyramica crassicornis casent0178115 profile 1.jpg

Pyramica crassicornis casent0178115 dorsal 1.jpg

Specimen labels

Known from litter samples taken from various forest habitats.

Identification

Bolton (2000) - A widely distributed but easily recognised member of the crassicornis complex in the Strumigenys gundlachi group. It is the only species of the complex that has not been recorded from Central America. Different series show slight variation in pilosity and sculpture but the diagnostic characters of sublobate scape, spatulate cephalic ground-pilosity, lack of an apicoscrobal hair and obviously swollen postpetiole are always apparent.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina, Brazil (type locality), Guyana, Paraguay, Trinidad and Tobago, Venezuela.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • crassicornis. Strumigenys crassicornis Mayr, 1887: 577 (w.) BRAZIL. Brown, 1959b: 12 (q.). Combination in Neostruma: Brown, 1948e: 111; in Pyramica: Bolton, 1999: 1672; in Strumigenys: Baroni Urbani & De Andrade, 2007: 117. See also: Bolton, 2000: 181.

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

Description

Worker

Bolton (2000) - TL 2.0-2.3, HL 0.48-0.57, HW 0.37-0.42, CI 72-77, ML 0.16-0.20, MI 30-37, SL 0.22-0.28, SI 60-70, PW 0.23-0.28, AL 0.47-0.56 (20 measured).

Characters of crassicornis complex. Masticatory margin of mandible with 3 - 5 denticles between apicodorsal tooth and submedian tooth, with 2 - 4 denticles proximal of the submedian tooth. Apex of mandible with 3 - 4 min ute intercalary denticles between apicodorsal and apicoventral teeth. In dorsal view scape shaft narrow or very narrow basally, then the leading edge is abruptly expanded and almost lobate at the subbasal angle, the shaft distinctly widest at this point. Apicoscrobal hair absent. Pair of standing hairs on cephalic dorsum close to occipital margin may be only weakly differentiated from the conspicuous spatulate ground-pilosity. Pronotal humeral hair often absent but a short filiform humeral hair may be present. Postpetiole in profile markedly swollen and subglobular, its ventral spongiform lobe minute to absent. Lateral spongiform lobe of postpetiole reduced to a narrow marginal lamella, sometimes vestigial. First gastral tergite often reticulate but sometimes entirely smooth except for the basigastral costulae; intermediate sculpture patterns are known.

Type Material

Syntype workers, BRAZIL: Santa Catarina (Naturhistorisches Museum Wien, Vienna) (examined).

References