Environmental Caution:

When a damp environment has too little air circulation, this can lead to an anaerobic environment. Where the typical aerobic bacteria helps keep certain types of waste from building up, they are instead replaced by anaerobic bacteria whose waste is more likely to be toxic and harmful. This is often accompanied by a strong swampy smell. 

To guard against anaerobic environments, it is important to monitor and control moisture in the environment as well as air quality. One way to maximize both is to have plentiful live plants as the byproduct of photosynthesis is oxygen and water. Springtails can help keep the substrate aerated and break down waste so that the beneficial bacteria can more easily turn it into plant food.

Defining Characteristics:

• This species derives its common name from the bright orange “hairs” surrounding their fangs
• This is a large, leggy species that can grow longer than 7 inches
• Like most arboreal species, Psalmopoeus reduncus has broad toe pads that iridesce when light hits the bottoms of them

Name: Psalmopoeus reduncus is commonly known as the Costa Rican Orange Mouth Tarantula. The genus part of the scientific name means ‘a type of song’, and the species epithet means ‘bent back’ or ‘curved’. 

Recommended Enclosure Size & Setup: Psalmopoeus reduncus is an arboreal species, meaning the enclosure should be taller than it is long. The recommended enclosure height is at least 3 times the spider’s diagonal leg span, and the other dimensions should not be less than two times the spider’s diagonal leg span. The enclosure will need to be upgraded as the animal continues to grow. 

4-5 inches of substrate will help the terrarium retain humidity while still allowing for this species to have its high ventilation requirements. ABG mix, coco cradle, or Dig-It are good substrate options, but our Pet Bug Team prefers ABG all the way!

They will benefit from a variety of terrarium furniture as well to climb on and foliage to hide behind. Live plants can be beneficial to air quality. 

Temperature (°F): This species thrives in the mid 70s  to low 80s, so a temperature close to 80° is ideal. Temperatures regularly dipping below 65 or spiking above 85 degrees should be avoided. 

A reliable thermometer is strongly recommended.

Humidity: These spiders thrive in a humid environment, so the recommended ambient humidity should stay between 60 and 75%. This can be achieved by making sure the substrate is always slightly moistened. Depending on your location, you may need tools such as a humidifier to maintain this environment.

The enclosure sides and décor should be spritzed lightly around twice a week to provide your animal droplets to drink from and keep humidity up. Do not spray your spider directly.  

A hygrometer is a great way to monitor the humidity for your animal and see any needed adjustments . 

Size: These tarantulas will measure at least 1 inch in diagonal leg span at time of sale. Females reach 5-6 inches, while males are significantly smaller.

Age: These spiders are about 1 year old at time of sale. Females can live up to 15 years while males generally only reach 3-4 years.

Feeding: These spiders are currently eating two to three 1/4 inch crickets, once a week. There are a variety of appropriate prey items that you can offer, such as roaches, waxworms, black soldier fly larvae, hornworms, and silkworms. Consider feeding your prey items with our gutload formula to give your pet well-rounded nutrition.

We recommend that the prey items not be much longer than the tarantula's “head” is wide. Larvae are an exception—our larvae are harmless. Since they are very high in fat, they're not the best staple diet, however they make a great weight gain supplement.

Remove uneaten prey items after 24 hours, these may stress your animal out or endanger the spider during molting. Never attempt to feed a freshly molted tarantula less than a week after their molt to prevent injury to the spider. Depending on its age, the hardening process could take anywhere from 48 hours all the way up to a week.

Sexing: Due to age, Psalmopoeus reduncus sold by Josh’s Frogs are sold as unsexed. 

Color/Pattern: As babies, they sport an emerald green abdomen and have bright orange bands on otherwise dark legs. As adults, they are mostly uniform brown with dark legs and an olive carapace.

Social Behavior: Psalmopoeus reduncus is not a sociable animal and should be housed as an individual. Attempts at cohabitation can result in cannibalism. 

This is a very nervous species. Their ‘fight or flight’ response is quickly triggered, and they will run and hide when disturbed. 

When this species feels threatened, it is quick to go into a threat pose—this is not an empty threat.

Natural Range: Psalmopoeus reduncus bears Costa Rica in its name, but has a very broad range from Belize to Panama.

History in the Hobby: This species has been infrequently available in the hobby for the last 15-20 years.

 Links of Interest:

• Arachnoboards: a community of spider enthusiasts that will be able to or have already answered almost any question you can think of with regards to tarantulas.