In the described male and female, the abdomen is mottled dark brown and pale yellow.
There are six small spines on top of the head. The carapace, long jaws and legs are reddish brown and bear white hairs.
Madagascarchaea fohy has an elevated, neck-like front of the body and long chelicerae. The described male and female had chelicerae 1.40 and 1.55 mm long, compared with carapace lengths of 0.68 and 0.75 mm. Each bears a small downward-pointing spine near its base, at 0.27 mm in the male and 0.28 mm in the female.
To compare elevation of the head region, the 2018 study measured a height along the tilted neck and divided it by carapace length. The ratios were 1.91 in the described male and 2.07 in the female. This incorporated the side-view tilt into the comparison. Microscopy and stacked photographs helped document the unusual outline.
An extinction-risk assessment has not been added yet.
Forest fire is a conservation concern at Parc Ivoloina, where the type specimens were collected. MFG’s Spring 2014 newsletter reported that a neighbouring charcoal operator’s fire spread into the park in November 2013, burning more than eight hectares. The article outlined a five-year plan to establish a native-tree canopy and control invasive plants. The plan addressed restoration of the local forest.