Strumigenys comis

Strumigenys comis

Strumigenys comis is a tiny predatory ant measuring just 2.3-2.4mm in total length, making it one of the smaller species in the genus ^[1]. Workers have a distinctive appearance with broadly expanded frontal lobes, a smooth unsculptured alitrunk, and short standing hairs on the waist segments and gaster. The species belongs to the Strumigenys splendens group and was originally described as Strumigenys comis before being moved to Pyramica and finally Strumigenys ^[2]. This ant is known only from southern Brazil, specifically Santa Catarina state in the Serra Geral region ^[1][2].

Nothing is known about the specific biology of Strumigenys comis, this species has never been studied in the wild or in captivity ^[3]. However, as a member of the Dacetini tribe, it almost certainly shares the predatory lifestyle typical of its relatives, hunting small prey like springtails using its specialized trap-jaw mandibles. This makes it a fascinating species for advanced antkeepers interested in observing specialized predatory behavior, though the complete lack of documented care information means you'll be pioneering its husbandry ^[3].

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Southern Brazil, specifically Santa Catarina state in the Serra Geral region. Found in the Atlantic Forest biome ^[1][2].
• Colony Type: Unknown, no colony structure data exists for this species. Based on genus patterns, likely single-queen (monogyne) colonies ^[3].
• Size & Growth:
  • Queen: Undocumented, estimated 3-4mm based on worker size and typical Strumigenys proportions
  • Worker: 2.3-2.4mm total length, HL 0.66-0.68mm, HW 0.49-0.50mm ^[1]
  • Colony: Unknown, no colony size data exists
  • Growth: Unknown, likely slow like other Strumigenys species
  • Development: Unconfirmed, estimated 8-12 weeks based on related Strumigenys species at optimal temperature (No direct development data exists. Based on genus patterns for small tropical Dacetini, expect relatively slow development.)
• Antkeeping:
  • Temperature: Estimated 22-26°C based on Brazilian origin and related species requirements. Avoid temperatures below 20°C or above 30°C ^[3].
  • Humidity: High humidity required, aim for 70-85%. These are forest floor ants from a humid biome, so keep the nest substrate consistently moist but not waterlogged ^[3].
  • Diapause: Unknown, southern Brazilian species may not require true hibernation, but may benefit from a slight cool period (15-18°C) during winter months ^[3].
  • Nesting: No specific nesting data exists. Based on related species, provide a naturalistic setup with moist substrate (soil/peat mix) and small chambers. Y-tong or plaster nests with fine chambers work well for their tiny size. Keep darkness during founding ^[3].
• Behavior: No documented behavior exists for this specific species. Based on genus-level knowledge, Strumigenys are specialized predators that use their trap-jaw mandibles to capture small prey, primarily springtails. They are typically slow-moving, non-aggressive toward humans, and quite shy. Their tiny size (2.3-2.4mm) makes escape prevention critical, they can squeeze through standard mesh barriers. Workers likely forage individually rather than in groups ^[3].
• Common Issues: completely unknown biology means experimental care, expect a learning curve with this species, tiny size creates extreme escape risk, use fine mesh barriers and tight-fitting lids, no documented diet acceptance, springtails are the safest starting point based on genus patterns, high humidity needs can lead to mold problems if ventilation is inadequate, no information on founding behavior, queen may be claustral like related species but this is unconfirmed

Discovery and Taxonomy

Strumigenys comis was originally described in 1959 by Walter Kempf as Strumigenys comis, based on worker specimens collected in Santa Catarina, Brazil by the famous entomologist F. Plaumann ^[1][2]. The holotype was collected in December 1958 from Serra Geral in Santa Catarina state ^[2]. The species was later moved to the genus Pyramica in 1999 by Bolton, and finally to Strumigenys in 2007 by Baroni Urbani and De Andrade ^[2]. The species belongs to the Strumigenys splendens group, which contains several similar-looking Neotropical species ^[1]. The type specimen has some damage, missing parts of the second and third legs, but remains the primary reference for identifying this species ^[2].

Why This Species Is Special

Strumigenys comis represents both a challenge and an opportunity for antkeepers. Unlike many commonly kept species with extensive care documentation, this species has never been studied in captivity, you will be pioneering its husbandry ^[3]. This means there's no established care protocol, no known diet acceptance, and no documented development timeline. However, for experienced antkeepers who enjoy experimentation and observation, this also means the opportunity to document behaviors and requirements that have never been recorded before. The species' tiny size (2.3-2.4mm) also makes it a fascinating subject for observing the specialized trap-jaw hunting mechanism that Dacetini ants are known for ^[3]. Being from southern Brazil, it may have slightly different temperature requirements than the more commonly kept tropical Strumigenys species.

Housing and Setup

Given the complete lack of species-specific data, you'll need to create a setup based on what works for related Strumigenys species. Use a small nest, test tubes work for founding colonies, but consider a Y-tong or plaster nest with very small chambers for established colonies. The nest material should hold moisture well, as these forest floor ants need high humidity. A naturalistic setup with a soil/peat substrate mixture works well, keep it consistently moist but not waterlogged. Provide a humidity gradient so the ants can choose their preferred zone. Since they're tiny, use fine mesh on any ventilation holes and ensure all connections are sealed, they can escape through gaps that larger ants cannot pass ^[3].

Feeding and Diet

No documented feeding records exist for Strumigenys comis. However, as a member of the Dacetini tribe, it almost certainly shares the predatory diet of its relatives. Strumigenys species are specialized springtail hunters, using their trap-jaw mandibles to capture these tiny hexapods. Start by offering live springtails (Folsomia candida or similar cultures) as a primary food source. Other small live prey like booklice (psocids), tiny mites, and fruit fly pupae may also be accepted. Sugar sources are unlikely to be accepted, Dacetini are not typically honeydew feeders. Do not assume acceptance of any food item without observation, document what your colony accepts and what it ignores ^[3].

Temperature and Seasonal Care

Based on the species' origin in southern Brazil (Santa Catarina, around 26-27°S latitude), aim for temperatures in the 22-26°C range. This is cooler than typical tropical species but warmer than temperate ants. A slight drop in temperature during winter months may be beneficial, but true hibernation is unlikely given the species' origin. Monitor your colony's activity levels, if workers become less active and cluster together, the colony may be entering a rest period. Avoid temperature extremes below 20°C or above 30°C. Use a heating cable on one side of the nest only if room temperature falls below the target range, and always provide a temperature gradient so ants can regulate their own exposure ^[3].

Behavior and Observation

Expect behavior similar to other Strumigenys species, these are not active, visible foragers like many common ant genera. Workers will likely spend most of their time in the nest or moving slowly through foraging areas. The trap-jaw mechanism is fascinating to observe: when a potential prey item comes within range, the mandibles snap shut with remarkable speed. This is a sit-and-wait predator, not an active hunter. Colonies are likely to be small, Strumigenys colonies typically number in the dozens to low hundreds, not thousands. Be patient with observation sessions and consider using a magnifying glass or macro lens to appreciate the tiny workers and their specialized anatomy ^[3].

Frequently Asked Questions

References