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Myrmecocystus romainei

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Description

Myrmecocystus romainei is a rare, monogynous ant species native to arid regions of the southwestern United States. It is notable for its honey pot workers (repletes) that store liquid food in their swollen gasters. The queen measures around 11–12 mm, and workers range from 4–8 mm. This species typically shows a reddish to tan coloration, with a darker gaster. Like other Myrmecocystus, it thrives in warm, dry environments and has a medium development rate.

Additional information

Behavior

Difficulty in breeding

Origin

The size of ants

Wintering

Description

Myrmecocystus romainei 

Colony Type: Monogynous
Colony Size: Up to 6,000–8,000 workers
Development Speed: Medium


Size

Queen: 11–13 mm
Workers: 4–8 mm

Color: Myrmecocystus romainei typically has a reddish to orange-brown head and thorax with a dark brown or black gaster. The contrast in coloration, combined with fine body hairs, gives the ants a slightly fuzzy and matte appearance. Their repletes become notably large and golden when filled.


Nutrition

• Insects (e.g., crickets, fruit flies, mealworms – dead or live)
• Syrup (4:1 water to honey or sugar)
• Fruits (apple, grape, banana, melon)
• Protein jelly
• Cooked, unsalted protein (chicken, shrimp, egg white)


Temperature and Humidity

Humidity:
 Arena: 40–60%
 Nest: 50–70%

Temperature:
 Arena: 24–32 °C
 Nest: 23–27 °C

Desert-adapted: thrives in warm, dry conditions but still requires some nest moisture for brood development.


Unique Traits of Myrmecocystus romainei

Romainei is a true honey pot ant species, producing large repletes that serve as living reservoirs of sugary fluids. These repletes suspend from the ceiling of the nest, storing food for use during dry or resource-scarce periods. The bright golden abdomen of filled repletes makes this species visually stunning.

Colonies are active, curious foragers, often seen forming well-defined foraging trails. While not overly aggressive, they can defend their nest when disturbed.


Nesting Recommendations

Ideal nest types include:
• Acrylic nests with vertical space for repletes
• Plaster nests with hydration chambers
• Aerated concrete (YTONG)
• Naturalistic sand-clay or cork nests (if well ventilated)

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