Crematogaster cedrosensis

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to Baja California, Mexico, found only on Cedros Island, San Martin Island, and the adjacent mainland ^[1][2][3]. This is a dry, Mediterranean-type climate with coastal desert and island habitats.
• Colony Type: Likely monogyne based on typical Crematogaster patterns, though colony structure has not been directly documented for this species.
• Size & Growth:
  • Queen: ~6-8mm, inferred from genus patterns
  • Worker: 3-3.5mm ^[4]
  • Colony: Unknown, likely several hundred workers based on typical genus patterns
  • Growth: Moderate, estimated based on related species
  • Development: Estimated 6-8 weeks at optimal temperature based on typical Crematogaster development (Development time inferred from genus-level data, specific timeline unconfirmed for this species)
• Antkeeping:
  • Temperature: Keep around 22-26°C. Provide a gentle temperature gradient so ants can self-regulate. Based on their Baja California origin, they prefer warm but not extreme conditions.
  • Humidity: Moderate humidity around 50-60%. Provide a moist nest area but ensure good ventilation to prevent mold. These are not high-humidity rainforest ants.
  • Diapause: Likely required. Baja California has a mild winter, so a short diapause period of 6-8 weeks at 10-15°C is recommended.
  • Nesting: In nature they likely nest in rotting wood, under bark, or in soil crevices. Y-tong (AAC) nests or plaster nests work well. Provide narrow chambers appropriate for their small 3mm size.
• Behavior: Crematogaster ants are known for their acrobatic defense display, they raise their heart-shaped abdomen over their body when threatened. They also use smear defense, wiping venom onto enemies with their modified stinger. Workers are relatively fast-moving and can be defensive. They are not aggressive toward humans but will defend their nest vigorously. Escape prevention is important due to their small 3mm size, use fine mesh barriers. They likely forage for honeydew and small insects.
• Common Issues: small size means escapes are likely without fine mesh barriers, limited data means care is based on genus patterns rather than species-specific research, slow colony growth can lead to overfeeding and mold problems, wild-caught colonies may carry parasites that are difficult to detect, diapause timing may differ from typical temperate species due to their island habitat

Housing and Nest Setup

Crematogaster cedrosensis is a small ant at only 3-3.5mm, so your housing setup needs to account for their tiny size. Y-tong (AAC) nests work well because they provide appropriately scaled chambers and allow you to monitor the colony easily. Plaster nests are another good option, they hold moisture well and provide the moderate humidity these ants prefer. Avoid large, open spaces in the outworld, instead use smaller foraging areas that match their scale. For the nest itself, keep chambers relatively narrow, about 3-5mm wide passages are appropriate for workers. The outworld can be simple: a small container with a layer of substrate for foraging. Use a test tube connected to the nest for water access. Escape prevention is critical, these tiny ants can squeeze through surprisingly small gaps. Apply fluon or use fine mesh on all openings. ^[4]

Feeding and Diet

In the wild, Crematogaster species are omnivorous, they tend honeydew-producing insects like aphids and scale bugs, and they also hunt small insects for protein. For your colony, offer sugar sources regularly: a drop of honey water or sugar water works well. For protein, provide small prey items like fruit flies, pinhead crickets, or other tiny insects. You can also offer commercial ant foods designed for small species. Feed small amounts at first and remove any uneaten food within 24-48 hours to prevent mold. A good schedule is to provide protein 2-3 times per week and keep a sugar source available constantly. Remove the sugar source and replace with fresh every few days.

Temperature and Seasonal Care

Crematogaster cedrosensis comes from Baja California, a region with warm, dry summers and mild winters. Keep your colony at 22-26°C with a slight gradient so workers can choose their preferred temperature. A small heating cable on one side of the nest can create this gradient, place it on top of the nest material, not underneath, to avoid excessive drying. During winter, these ants likely experience a dormant period. Provide a diapause of 6-8 weeks at 10-15°C, you can simply move the colony to a cooler location like an unheated garage or basement (if temperatures stay above freezing). Reduce feeding during diapause and keep the nest slightly moist but not wet. Return to normal temperatures gradually in spring.

Behavior and Defense

The genus Crematogaster is known as 'acrobat ants' for their distinctive defensive behavior, when threatened, workers raise their heart-shaped abdomen over their body, mimicking a stinger. Additionally, they use smear defense, where a modified flattened stinger is used to wipe or smear venom onto enemies rather than piercing flesh. While these ants are not dangerous to humans (they lack a painful sting), this display can be startling and serves to deter predators. Workers are relatively active and fast-moving. They are not typically aggressive toward keepers but will vigorously defend their nest. In the outworld, they search systematically for food, using chemical trails to recruit nestmates to good food sources. Their small size means they can be overlooked, but they are observant escape artists, always check that your setup is secure. ^[4]

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