Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

BugGuide is a National Moth Week Partner. How to add your National Moth Week 2021 photos. July 17-25.

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

National Moth Week 2020 photos of insects and people.

Photos of insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Previous events


Species Pseudomyrmex gracilis - Graceful Twig Ant

Ant or wasp? - Pseudomyrmex gracilis Unk. Hymenopteran - Pseudomyrmex gracilis Ant - Pseudomyrmex gracilis Elongate Twig Ant - Pseudomyrmex gracilis Graceful Twig Ant - Pseudomyrmex gracilis  Pseudomyrmex Ant? - Pseudomyrmex gracilis - male Ant or wasp? - Pseudomyrmex gracilis - female Pseudomyrmex  sp. - Pseudomyrmex gracilis
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Ants, Bees and Stinging Wasps)
Superfamily Formicoidea (Ants)
Family Formicidae (Ants)
Subfamily Pseudomyrmecinae (Elongated Ants)
Genus Pseudomyrmex (Twig Ants)
Species gracilis (Graceful Twig Ant)
Other Common Names
Mexican Twig Ant
Slender Twig Ant (not recommended as a species-specific name as this can apply to all members of the genus)
Explanation of Names
Pseudomyrmex gracilis (Fabricius 1804)
gracilis = 'slender'
8-10 mm(1)
A long, solitary, wasp-like ant. Large eyes, two segmented petiole, well developed sting. Color varies with geographic distribution, and can range from dark brown-black, to orange-brown, or a mixture of orange and brown [bicolored]. The variation found in Florida is mostly described as bicolored with a black head, black abdomen, and an orange middle region.(1)
se US (SC-FL-TX) to S. Amer. - Map (1)(2)
live insects (especially lepidopteran larvae), fungal spores; tends aphids for honeydew(1)
Life Cycle
Small nests. Leave pheromone trails. Unlike other congeners, not associated with Acacia trees.
possesses a somewhat painful sting, perhaps approximate in intensity to the fire ant, Solenopsis invicta, but rarely uses it. (Graham Montgomery, pers. obs.)
Print References
Wetterer J.K. (2010) Worldwide spread of the graceful twig ant, Pseudomyrmex gracilis (Hymenoptera: Formicidae). Fla. Entomol. 93: 535-540.
Internet References
Fact sheet (Toth 2007-2013)(4)