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Ant key 5

Subfamily Myrmicinae

Antennae 5-segmented (including the scape), and with the third segment from the tip elongate and much longer than the other segments (excluding the scape). Spines on mesosoma in addition to pair on propodium. Orectognathus antennatus
Antennae 6-segmented (including the scape), and with the third segment from the tip shorter than other segments. Spines on propodium but not on mesosoma (NB: S. xenos is a social parasite of S. perplexa and has no workers). Strumigenys perplexa
[Orectognathus antennatus] head. Image: April Nobile (Specimen code: CASENT0172360). www.antweb.org Image
Orectognathus antennatus head. Image: April Nobile (Specimen code: CASENT0172360). www.antweb.org
[Strumigenys perplexa] head. Image: April Nobile (Specimen code: CASENT0172367). www.antweb.org Image
Strumigenys perplexa head. Image: April Nobile (Specimen code: CASENT0172367). www.antweb.org