Miranda's Disc Frog

Geographical Origin and Habitat: This species is distributed in the northern Amazon basin, including Guyana, Suriname, French Guiana, and northern Brazil. It inhabits pristine lowland tropical rainforests (terra firme), where it lives a strictly fossorial life, burrowed in clay-rich soils or under deep layers of decaying leaf litter.

Taxonomy and Genetics: Belongs to the family Microhylidae, subfamily Otophryninae, and genus Synapturanus. First described by Miranda-Ribeiro. It is part of a highly specialized group of fossorial microhylid frogs. Molecular studies confirm its evolutionary distinctness within the northern Amazonian clades.

Behavior and Habits: Almost entirely fossorial. It spends its life buried in moist soil, emerging only during or immediately after heavy tropical rainstorms. Males call from within their underground chambers, making them extremely difficult to locate. They are shy, solitary, and cryptically active.

Morphology: A tiny frog, with adults reaching an average length of 2.5 to 2.8 cm (approx. 1 inch). The body is robust and pear-shaped, with short, powerful limbs adapted for digging backwards. It features a highly pointed, protruding snout used for burrowing, and small, reduced eyes, which is a classic adaptation to subterranean life.

Terrarium Setup: Requires a specialized fossorial terrarium of at least 40x30x30 cm (15x12x12 inches). The substrate is critical: provide a deep layer (10-15 cm) of organic soil, peat moss, and coconut fiber, kept constantly moist. Top the substrate with a thick layer of sterile leaf litter (such as oak or catappa leaves).

Lighting and Heating: Because of their underground lifestyle, they do not require high-intensity lighting; a low-wattage LED to simulate day/night cycles is sufficient. Maintain temperature between 24°C and 26°C (75-79°F) using a heating mat or cable attached to the side of the tank. Night drop to 20°C (68°F).

Humidity and Hydration: Relative humidity must be kept exceptionally high, between 80% and 95%. Mist the terrarium twice daily with dechlorinated water. A very shallow water dish should be provided, though they absorb most of their moisture directly through their skin from the damp soil.

Feeding and Supplementation: Feeds on microscopic soil invertebrates. In captivity, feed them springtails, dwarf isopods, fruit flies (Drosophila), and pinhead crickets. Preys must be dusted with high-quality calcium powder at every feeding and a multivitamin supplement containing D3 twice a week.

Compatibility: Strictly a single-species display animal. Do not house with other amphibians, reptiles, or active terrestrial animals. A small group can be kept together if the terrarium is large enough to allow each frog to establish its own burrowing territory.

Health and Common Diseases: Highly susceptible to bacterial and fungal skin infections (chytridiomycosis) if the substrate becomes waterlogged and stagnant. Soil should be kept damp, not soggy. Dehydration is a rapid and fatal risk if humidity levels drop. Avoid handling, as their skin is extremely sensitive.