Pheidole angusticeps

Pheidole angusticeps

Pheidole angusticeps is a small Neotropical ant native to northwestern Costa Rica, where it inhabits second growth dry forests in the Guanacaste region. The species was described by Wilson in 2003 and was later recognized as a senior synonym of Pheidole angusticeps ^[1]. Majors are yellow with a faint reddish tint, while minors are a uniform medium yellow. The minor workers have a distinctive narrow head (cephalic index 80-83), which is where the species name 'angusticeps' (narrow-headed) comes from ^[1]. This species has been collected from leaf litter samples and at tuna baits on the ground, and it serves as prey for the army ant Neivamyrmex alfaroi ^[2].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Northwestern Costa Rica, specifically the Guanacaste region including Santa Rosa National Park and the Islas Murciélago. They live in second growth dry forest habitats, areas of tropical dry forest that has regrown after disturbance ^[2][1].
• Colony Type: Unconfirmed. Pheidole species typically form colonies with a single queen (monogyne) or multiple queens (polygyne), but the specific colony structure of P. angusticeps has not been documented.
• Size & Growth:
  • Queen: Estimated 5-7mm based on genus patterns, no direct measurement available
  • Worker: Major: 0.98mm head width, Minor: 0.46mm head width,0.60mm total length ^[1]
  • Colony: Unknown for this specific species, typical Pheidole colonies reach several hundred to a few thousand workers
  • Growth: Moderate, based on typical Pheidole development patterns
  • Development: Estimated 6-8 weeks at tropical temperatures (25-28°C) based on genus-level data for Pheidole species (Development time is inferred from related Pheidole species, specific data for P. angusticeps is not available)
• Antkeeping:
  • Temperature: Keep at 24-28°C. This species comes from tropical dry forest in Costa Rica, so they prefer warm conditions year-round. A heating cable on one side of the nest can create a temperature gradient ^[2].
  • Humidity: Moderate humidity (50-60%). As a dry forest species, they prefer conditions that are drier than typical rainforest ants. Allow the nest to dry out partially between water additions.
  • Diapause: No, being a tropical species from Costa Rica, they do not require hibernation or winter rest. Keep temperatures consistent year-round.
  • Nesting: Y-tong (acrylic) nests or plaster nests work well. This species is small (minors are only ~0.5mm) so ensure escape prevention is excellent. Provide a shallow water setup for humidity control.
• Behavior: Minor workers are foragers and likely collect food while majors defend the colony and process larger prey items, this is typical Pheidole behavior. They have been collected at tuna baits, indicating they are scavengers and will accept protein baits. The species is not known to be particularly aggressive, but majors will defend if threatened. Their very small size means escape prevention must be excellent, they can squeeze through tiny gaps.
• Common Issues: very small size makes escape likely without fine mesh barriers, tropical species requires warm temperatures year-round, cold can kill them, dry forest habitat means they prefer drier conditions than many ants, overhumidity can cause problems, slow colony development can frustrate beginners who overfeed and cause mold, wild-caught colonies may have parasites that kill them in captivity

Housing and Nest Setup

Pheidole angusticeps is a small ant that requires careful attention to escape prevention. Use a Y-tong (acrylic) nest or a plaster nest with appropriately scaled chambers, the passages should be narrow enough that majors can move through comfortably but not so large that the tiny minors can easily escape. Test tube setups can work for founding colonies but monitor for flooding. Apply Fluon or similar barrier to all edges. Because they are so small, even standard test tube setups need excellent sealants around the cotton. Provide an outworld area for foraging that is easy to clean. ^[2][1]

Feeding and Diet

In the wild, P. angusticeps has been collected at tuna baits on the ground, showing they are scavengers that will accept protein baits ^[2]. They likely also collect honeydew from aphids and tend small homopterans, as is typical for Pheidole. Feed a mix of protein (small insects like fruit flies, pinhead crickets, or commercial ant food) and sugar sources (honey water, sugar water). For minors, crush prey items into smaller pieces since they are very small. Remove uneaten food promptly to prevent mold.

Temperature and Heating

As a tropical species from Costa Rica, Pheidole angusticeps requires warm conditions year-round. Keep the nest area at 24-28°C (75-82°F). A heating cable placed on top of the nest (not underneath, to avoid excessive drying) can maintain these temperatures. Room temperature may be sufficient in warm homes but monitor with a thermometer. Avoid temperatures below 22°C as this species is not adapted to cool conditions. Provide a temperature gradient so ants can move between warmer and cooler areas. ^[2][1]

Humidity and Water

This species comes from tropical dry forest habitat, which is relatively drier than rainforest environments ^[2]. Keep humidity moderate (50-60%) rather than wet. Allow the nest substrate to dry out partially between water additions. Provide a shallow water dish in the outworld for drinking. For Y-tong nests, use a water tube but do not overfill, the nest should have some moisture but not be saturated. Watch for condensation buildup and ventilate if needed to prevent the nest from becoming too damp.

Colony Development

Pheidole colonies develop major workers (soldiers) once the colony reaches a certain size, this is triggered by colony population and resources. Expect the first major workers to appear after the colony has grown to perhaps 50-100 workers. Majors have a larger head (0.98mm width) for processing food and defending the colony. Growth rate is moderate, expect several months to a year to reach a colony of 100+ workers. Be patient and do not overfeed during the founding stage as excess food causes mold problems. ^[1]

Frequently Asked Questions

References