Strumigenys ananeotes

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Known only from an urban garden in Salt Lake City, Utah, USA, far outside the normal range of this mostly tropical genus. Found in a raised-bed garden with potting soil about 20 cm deep, living in soil to about 10 cm depth ^[1][3]. The area has a continental climate with cold winters and hot, dry summers, but summer irrigation makes moist, warm conditions similar to eastern deciduous forests ^[1].
• Colony Type: The only collected colony had 66 workers and 6 winged queens ^[1]. Colony structure is not confirmed. Most Strumigenys species have a single queen, but this has not been studied for Strumigenys ananeotes.
• Size & Growth:
  • Queen: Estimated total length about 4-5 mm (based on head width of 0.423 mm and typical Strumigenys proportions) ^[2]. Exact body length not available.
  • Worker: Estimated total length about 2-3 mm (based on typical Strumigenys size). Exact body length not available ^[2].
  • Colony: At least 66 workers in the wild ^[1]. Likely under 200 based on genus patterns.
  • Growth: Unknown, no captive data exists for this newly described species
  • Development: Unconfirmed. Based on related Strumigenys species, expect 2-4 months at optimal temperature. (This is a newly described species with no captive breeding studies. All timeline estimates are guesses.)
• Antkeeping:
  • Temperature: Keep at room temperature (20-24°C). They come from temperate Utah with strong seasonal swings, so they likely tolerate 15-28°C. Avoid extreme heat. Stable temperatures are better than fluctuating ones. ^[1]
  • Humidity: High humidity is critical. In the wild they live in moist soil under irrigated gardens. Keep the nest substrate consistently damp but not waterlogged, aim for a humidity gradient with one moist area and one drier area. These are subterranean ants that need stable moisture. ^[1][3]
  • Diapause: Likely yes, Utah has cold winters. Expect a rest period at cool temperatures (10-15°C) for 2-3 months to simulate winter. ^[1]
  • Nesting: Soil-dwelling species. In captivity, use a naturalistic setup with moist soil or a plaster or Y-tong nest with a water reservoir to keep humidity high. They nest in soil to about 10 cm depth. Never use acrylic nests, they don't hold humidity well for this species. ^[1][3]
• Behavior: Extremely shy and non-aggressive. They are specialist hunters that feed on springtails using their mandibles. They forage mostly at night. Workers are tiny and can easily escape through standard barriers, you need very fine mesh and tight seals. They have a functional stinger but it's tiny and not medically significant to humans. ^[1][3]
• Common Issues: escape prevention is critical, workers are tiny (2-3 mm) and can get through standard ant barriers, specialized diet requirement, they only eat live springtails and will starve on typical ant food, high humidity needs, dry conditions kill them quickly, no captive breeding data exists, this species was only discovered in 2018 and has zero husbandry history, extremely rare in the hobby, you likely cannot obtain this species because it's only known from one wild location

Discovery and Rarity

Strumigenys ananeotes is one of the most recently discovered and rarest ants in North America. It was found by myrmecologist Jack Longino in his own backyard in Salt Lake City, Utah, on August 13-14,2018 ^[1]. The species was formally described in 2019,and 'ananeotes' means 'newly emerged', a reference both to its recent discovery and its emergence from the soil after summer rains or irrigation created favorable conditions ^[1]. This is the ONLY known population of this species anywhere in the world. The ants were found in a raised-bed garden with potting soil about 20 cm deep, with 66 workers and 6 winged queens collected from soil excavated to about 10 cm depth ^[1][3]. This find is surprising because Strumigenys is mostly a tropical and subtropical genus, and Utah is far from any other known Strumigenys record ^[1]. Scientists think this is a relict species that survived in moist underground spots during Utah's dry periods, and now spreads because urban irrigation creates damp garden conditions ^[1][3].

Identification and Distinguishing Features

Strumigenys ananeotes can be identified by its unique tooth pattern, it is the ONLY North American Strumigenys where the first 7 teeth alternate between large and small pointed teeth ^[1]. The basal-most tooth is small or missing, giving a count of 8 or 7 teeth of alternating sizes ^[1]. Workers have well-developed eyes with 7-10 ommatidia, and queens have 45-50 pigmented ommatidia ^[2]. The setae on the clypeus (front margin of the head) are distinctive: they are spoon-shaped, translucent, and have irregularly scalloped edges, different from all similar species ^[2]. This species is most similar to western Strumigenys chiricahua, eastern Strumigenys hyalina, and Mexican Strumigenys dispalata, but differs in tooth size patterns and clypeal setae shape ^[1]. Exact body length is not provided in the research, total length estimated at about 2-3 mm for workers and 4-5 mm for queens, based on typical Strumigenys proportions ^[2].

Feeding and Diet - Critical

This is the most challenging part of keeping Strumigenys ananeotes: they are specialist hunters that feed almost exclusively on springtails (Collembola) ^[3]. In the wild, they hunt springtails in leaf litter, rotting wood, and soil ^[3]. This means they will NOT survive on typical ant foods like sugar water, honey, or protein mixes. In captivity, you MUST provide live springtails as their main food source. Other tiny arthropods like small isopods might be accepted, but springtails should be the staple. This specialized diet makes them one of the hardest ants to keep, they are not for beginners. You will need to culture your own springtail colony to ensure a steady food supply. Do not try to keep this species unless you are ready to maintain both the ants and a springtail culture long-term. ^[3]

Housing and Nest Setup

Strumigenys ananeotes is a soil-dwelling species that nests in moist soil to about 10 cm depth ^[1]. For captivity, use a naturalistic setup with moist soil, a shallow container with damp soil, leaf litter, and small pieces of rotting wood mimics their natural habitat. Alternatively, use a plaster or Y-tong nest with a water reservoir to keep humidity high, but make sure the chambers are small enough for their tiny size (2-3 mm workers). The nest must hold moisture consistently, these ants cannot handle dry conditions. Use a hydration system that keeps the substrate damp without flooding. Because they are tiny and can escape through normal barriers, use very fine mesh and tight-fitting lids. Provide a foraging area with leaf litter where you can introduce springtails so they can hunt naturally. ^[1][3]

Temperature and Seasonal Care

Based on their Utah origin, Strumigenys ananeotes experiences wide temperature swings in the wild, cold winters and hot, dry summers. In captivity, keep them at room temperature (20-24°C) as a baseline. They likely tolerate a range from cool (15°C) to warm (28°C), but avoid extremes. The key is stability, sudden changes stress them. For winter, expect a diapause period at cool temperatures (10-15°C) for 2-3 months, simulating Utah's cold winters ^[1]. During the active season, they were seen foraging at night in August when temperatures had cooled ^[1]. This suggests they are more active during cooler periods and may avoid heat. Watch your colony, if workers seem sluggish, try slightly cooler temperatures, if they are very active, your temperature is probably right. ^[1][3]

Behavior and Temperament

Strumigenys ananeotes is extremely shy and non-aggressive. Workers are tiny and likely spend most of their time underground hunting springtails. They are specialist predators that use their mandibles to catch tiny prey, they have a functional stinger but it's tiny and not medically significant to humans ^[3]. Foraging has been seen at night on the soil surface, so they are likely nocturnal or crepuscular hunters ^[1]. They are not defensive and will not attack, their survival strategy is hiding, not fighting. However, their tiny size (2-3 mm workers) means they are excellent escape artists. Standard barrier systems will not stop them, you must use very fine mesh, tight lids, and possibly liquid barriers like fluon. Their colony size is probably small (the wild colony had 66 workers) and they likely grow slowly. ^[1][3]

Frequently Asked Questions

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References