Crematogaster longispina

Crematogaster longispina

Crematogaster longispina is a small arboreal ant species native to the Neotropical region, found across Colombia, Costa Rica, Ecuador, French Guiana, Guyana, Nicaragua, Peru, and Suriname. Workers measure 0.65-0.76mm in head length and feature distinctive very long, strongly diverging propodeal spines and abundant erect hairs on their tibiae. Their coloration ranges from dark red-brown to black, with notably lighter yellow tarsi and antenna tips. This species builds small carton nests (typically 10-15cm across) on low vegetation and tree trunks in wet forest environments.

What makes C. longispina particularly interesting is its relationship with epiphytic plants. These ants are known ant-garden initiators, forming mutualistic relationships with plants like Codonanthe crassifolia, whose seeds germinate in the ants' carton nests. The nests are loose and friable, often hosting sprouting epiphytes and roots penetrating the structure. Colonies are polygynous (multiple queens) and show signs of polydomy (multiple nest sites), with one of the few Crematogaster species where alate queens and males have never been observed in the wild.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Neotropical wet forests from sea level to ~500m elevation, primarily in Costa Rica, Ecuador, Colombia, Peru, and northern South America ^[1][2]
• Colony Type: Polygynous (multiple queens per colony), with physogastric queens. Colonies show polydomy, multiple connected nests. Workers are monomorphic ^[3][1].
  • Colony: Polygyne
• Size & Growth:
  • Queen: Not specifically measured in primary literature, estimated similar to genus at 4-6mm based on related species
  • Worker: HL 0.655-0.761mm, HW 0.634-0.776mm, WL 0.798-0.944mm ^[1]
  • Colony: Small colonies in twigs, up to 6 queens in a single nesting site. Overall colony size likely moderate (hundreds of workers) based on related species
  • Growth: Moderate, inferred from similar arboreal Crematogaster species
  • Development: 6-10 weeks estimated based on genus patterns for tropical species (Development timeline not directly studied for this species. Related tropical Crematogaster species typically develop in 6-10 weeks at warm temperatures.)
• Antkeeping:
  • Temperature: Keep warm at 24-28°C. This is a tropical wet-forest species requiring consistently warm conditions ^[1]. Use a heating cable on one side of the nest to create a gradient if room temperature is below this range.
  • Humidity: High humidity is critical, these ants live in very humid wet forest conditions. Keep nest substrate consistently moist but not waterlogged. Provide a water tube as a constant moisture source. Mist occasionally but avoid standing water.
  • Diapause: No, this is a tropical species that does not enter hibernation. Maintain warm, stable conditions year-round ^[1].
  • Nesting: Arboreal nester, in captivity they will accept Y-tong (AAC) nests, plaster nests, or test tube setups. Provide materials they can build carton-like structures with if possible. They naturally nest in small cavities in vegetation and rotting wood ^[1].
• Behavior: Generally non-aggressive but will defend their nest vigorously. Workers are active foragers, primarily tending homopteran insects (scale insects and aphids) for honeydew, which forms a major part of their diet. They also collect nectar and hunt small insects. Escape risk is moderate, their small size (under 1mm) means they can squeeze through small gaps, so use fine mesh barriers and tight-fitting lids. They are arboreal and spend most of their time in elevated nest structures.
• Common Issues: high humidity maintenance is critical, dry conditions will kill colonies quickly, escape prevention requires fine mesh barriers due to their very small worker size, tropical species cannot tolerate cool temperatures, keep above 24°C year-round, wild-caught colonies may be stressed from habitat loss and may carry parasites, colonies may be difficult to establish as they prefer established carton nests with multiple queens

Housing and Nest Setup

Crematogaster longispina is an arboreal species that naturally builds carton nests in wet forest vegetation. In captivity, they adapt well to Y-tong (acrylic) nests or plaster nests with small chambers. Test tubes can work for founding colonies but may need to be modified to provide the humidity they need. The key requirement is maintaining high humidity, these ants come from constantly damp forest environments where dehydration is a major threat. Use a water tube setup to provide constant moisture, and consider covering part of the nest with damp substrate. Avoid dry formicarium setups. If you want to encourage natural behavior, provide materials like shredded paper or cotton that they can use to build carton-like structures. Place the nest in a warm area (24-28°C) away from direct sunlight and air conditioning vents. ^[1][2]

Feeding and Diet

In the wild, C. longispina primarily feeds on honeydew collected from coccoid Homoptera (scale insects) that live in their nests, along with nectar from flowers and small insects they capture. In captivity, offer sugar water or honey as a constant energy source. For protein, provide small insects like fruit flies, pinhead crickets, or mealworms. They will also accept sweet fruits as nectar sources. Feed protein prey 2-3 times per week, and keep sugar water available at all times. Remove uneaten prey after 24-48 hours to prevent mold. This species is not a specialized predator, so variety in their diet helps maintain health. Some keepers report success with commercial ant jelly as well. ^[1]

Temperature and Humidity Requirements

This is a strict tropical species requiring warm, humid conditions. Maintain temperatures between 24-28°C year-round, they do not tolerate cool conditions and lack any diapause or winter dormancy. Temperature drops below 20°C can be fatal. Humidity is equally critical: keep the nest environment at 70-85% relative humidity. Use a water tube in the outworld and consider misting the nest area regularly. The substrate or cotton in the nest should feel consistently damp but never soaking wet. In dry environments, you may need to use a humidifier near the ant setup or keep the formicarium in a enclosed space to trap moisture. These ants are sensitive to habitat fragmentation and edge effects in the wild, suggesting they prefer stable, undisturbed conditions. ^[1]

Colony Structure and Queen Care

C. longispina is polygynous, meaning colonies naturally have multiple queens. In the wild, colonies can have several physogastric (egg-laying) queens living together in the same nest. This makes them different from many other ant species where single-queen colonies are the norm. When keeping this species, you may receive colonies with multiple queens, this is normal and they should be kept together. The species also shows polydomy, meaning colonies maintain multiple nest sites connected by workers. This explains why they often nest in scattered locations in vegetation. One unusual observation from researchers is that despite extensive field studies, no one has ever observed adult males or alate (winged) queens in the wild, suggesting mating may occur within the nest or the species has unusual reproductive behavior. ^[3][1]

Behavior and Defense

Workers of C. longispina are relatively docile toward humans but will aggressively defend their nest against intruders. They lack a painful sting but can bite and may release formic acid as a defensive secretion, common in the Crematogaster genus. Their most notable natural behavior is building and maintaining carton nests, a papery material made from plant fibers and ant secretions. These nests are surprisingly loose and friable, easily falling apart when disturbed. The ants use these nests as platforms for farming scale insects (coccoid Homoptera) for honeydew, and the nests often become mini-ecosystems with growing epiphytes. In captivity, you may observe workers tending any scale insects present and actively defending their territory. They are good climbers and will explore vertical surfaces in search of food. ^[1]

Ant Garden Relationship

One of the most fascinating aspects of C. longispina is its mutualistic relationship with epiphytic plants, particularly Codonanthe crassifolia. This is a true ant-garden species, they actively initiate ant gardens by building carton nests that become substrates for plant seeds to germinate. The plants grow roots that penetrate the nest structure, providing the ants with shelter and potentially nutrients, while the plants get a protected growing platform. In captivity, you might observe similar plant growth if conditions allow. This relationship explains why their natural nests are so distinctive, they are essentially small gardens. If you want to create a naturalistic setup, you could add small epiphytes or mosses near the nest, though success is not guaranteed. ^[1]

Seasonal Care and Growth

As a tropical species, C. longispina does not require any seasonal temperature changes or hibernation. Maintain consistent warm, humid conditions throughout the year. Colony growth is likely moderate, similar to other arboreal Crematogaster species. Founding colonies may take several months to establish, with the first workers (nanitics) appearing within 6-10 weeks under optimal conditions. Growth rate depends heavily on temperature, warmer temperatures within their range speed development, while cooler temperatures slow it significantly. Polygynous colonies may grow faster initially since multiple queens can lay eggs simultaneously. Monitor colony activity levels as an indicator of health, active workers exploring and foraging indicates good conditions, while lethargy or clustering may signal temperature or humidity problems. ^[1]

Frequently Asked Questions

References