The type locality, Paramaka Creek, is a medium sized and shallow stream with 3-7 m width, less than 50 cm depth, pools and some riffle habitat, a rocky substrate, and bordered by terra firme rainforest. Its water was transparent with a mean pH of 6.26, conductivity 24.2 μS/cm and temperature 23.2°C. Collected together with several Harttiella crassicauda .
Dorsal spines (total): 2; Dorsal soft rays (total): 7; Anal soft rays: 5. : elongated.
Behavioural data for Guyanancistrus Nassauensis is currently being reviewed.
Diet information for Guyanancistrus Nassauensis is currently being compiled.
Reproduction data for Guyanancistrus Nassauensis is currently being compiled.
Freshwater; demersal. Tropical; 23°C - ? South America: Paramaka Creek and some of its tributaries, Marowijne River Basin in the Surinamese Nassau Mountains.
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