Crematogaster vermiculata

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Western and southeastern USA to central Mexico. Found in cypress swamps, hardwood forests, desert scrub (mesquite, cactus), pinyon-juniper woodlands, oak forests, and riparian areas. Nests in soil, under stones, in rotting wood, in dead tree limbs, and in cypress trees ^[1][2][3][5].
• Colony Type: Unconfirmed. Likely single-queen (monogyne) based on typical Crematogaster patterns, but no direct evidence.
• Size & Growth:
  • Queen: ~5–7 mm, inferred from Crematogaster genus (direct measurements unavailable).
  • Worker: ~3–5 mm, inferred from Crematogaster genus (direct TL measurements unavailable).
  • Colony: Unknown. Not documented in literature.
  • Growth: Moderate (estimated based on genus patterns).
  • Development: 6–10 weeks (estimated based on related Crematogaster species, direct data unavailable). (Brood found in nests from April through September in the wild, suggesting multiple generations per year in warm conditions ^[7].)
• Antkeeping:
  • Temperature: Maintain around 22–26°C. They tolerate a range from cool swamp conditions to warmer desert habitats. Provide a temperature gradient so they can self-regulate ^[8][9].
  • Humidity: Moderate to high. Provide consistently moist nest substrate but ensure ventilation to prevent mold. They occur in both wet and dry habitats, so a humidity gradient works well ^[5].
  • Diapause: Yes, likely required in temperate regions. Reduce to 10–15°C for 2–3 months in winter. Based on seasonal activity patterns in Georgia (March to October) ^[7].
  • Nesting: Provide a Y-tong, plaster, or soil nest with moisture retention. They naturally nest in rotting wood, under stones, and in soil. Avoid acrylic nests, rotting wood or moist chambers are ideal. Keep nest material damp but not waterlogged ^[5].
• Behavior: Workers are active foragers on the ground and on vegetation. When disturbed, they raise their abdomen over their head, the classic acrobat display. They are not aggressive but will defend the nest. They possess a modified stinger used for smearing venom, not piercing. Escape risk is low due to size, but standard barriers (fluon, tight lids) are recommended ^[5].
• Common Issues: nest kept too dry, they require consistent moisture., slow colony growth compared to common species, patience needed., mold in rotting wood nests if ventilation is inadequate, ensure air flow., wild-caught colonies may carry parasites or diseases, quarantine new colonies., avoid very dry, unstable conditions, they do poorly in highly disturbed habitats.

Nest Preferences and Housing

Crematogaster vermiculata nests in a wide variety of substrates. In the southeastern United States, it is almost always found on live bald cypress trees (Taxodium distichum) ^[3][4]. In the west, it nests under stones, in soil (occasionally with a small mound), in rotting logs, and in dead tree limbs ^[5]. It is often nest-site limited because it prefers rotting wood, which is scarce in disturbed areas ^[9]. For captive care, provide a nest that holds moisture, Y-tong (AAC) blocks, plaster, or soil-based setups work well. Avoid completely dry conditions. Offer chambers with narrow passages suitable for their small worker size ^[5].

Feeding and Diet

Workers are omnivorous with a strong preference for protein. They forage on the ground and on vegetation, hunting small insects and collecting honeydew ^[5]. A study found that they increase carnivory when sodium is limited, and they strongly prefer sodium baits in inland forests compared to coastal areas ^[6]. Feed them small insects (fruit flies, pinhead crickets, mealworm pieces) 2–3 times per week, plus sugar water or honey. Consider occasional sodium supplementation (e.g., a drop of dilute salt solution). Remove uneaten prey after 24 hours to prevent mold ^[6].

Temperature and Seasonal Care

Keep the nest at 22–26°C. This species tolerates a range, from cool swamp conditions to warmer desert habitats, so a gentle gradient is beneficial ^[9][8]. Their population increases with more growing degree days (warming), but avoid extreme heat ^[8]. In temperate regions (e.g., Georgia, North Carolina), they are active from March to October and likely need a winter diapause. Reduce temperature to 10–15°C for 2–3 months during winter. Brood is found in nests from April through September, indicating they can produce multiple generations per warm season ^[7].

Behavior and Temperament

Crematogaster vermiculata workers are active, diurnal foragers that search both on the ground and on low vegetation. Their most distinctive behavior is the 'acrobat' display, when threatened, they raise their abdomen over their head. They are not aggressive toward keepers but will defend the nest if disturbed. Workers use chemical trails to recruit nestmates. They have a modified, flattened stinger used to smear venom rather than sting, but it is harmless to humans ^[5]. Because of their moderate size (≈3–5 mm), standard escape prevention (fluon, tight-fitting lids) is sufficient ^[5].

Colony Development and Growth

Colony growth is moderate. How colonies start in the wild is not documented, founding is unconfirmed. Based on typical Crematogaster patterns, queens may be claustral (sealing themselves in a chamber), but this is speculation ^[5]. The first workers (nanitics) will be smaller than normal. Development from egg to worker likely takes 6–10 weeks at optimal temperatures, based on related species. Brood is present in nests from April to September, suggesting multiple generations per year in warm climates ^[7]. Colony size is unknown but probably reaches at most a few hundred workers ^[5].

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References