Between 2016 and 2017, four oceanographic cruises were carried out in the Perdido Fold Belt area, in the northeastern province of the Gulf of Mexico. Benthic fauna was collected by bottom trawling with a benthic sled at 27 sampling sites, ranging from shallow to abyssal depths. The results obtained with the group of crustaceans are presented, selecting only the trawls representative of the bathyal benthic provinces (200–2000 m) and the abyssal plains (2000–6000 m) for analysis. Thus, 31 trawls with depths of 470 to 3600 m were recorded. The group was represented by 35 families, 72 genera, and 95 species. The lowest abundance/biomass recorded at the sampling sites was 2 org·ha⁻¹/17.67 g·ha⁻¹, while the highest was 400 org·ha⁻¹/5042.62 g·ha⁻¹. The highest species richness (16 species) was found at depths of 470 m, and the lowest (1 species) at 950–1000 m. Consequently, the lowest diversity (0.0 bits·ind⁻¹) was recorded at 950–1000 m and the highest (2.943 bits·ind⁻¹) at 470 m. The dominance of the top 5 species on each cruise reaches more than 50% for each, with 3 species remaining in this classification across all 4 cruises. The similarity given by the Bray-Curtis index associates similar depths. The NMDS (Non-metric Multidimensional Scaling) was used for the species ordinations because it is suitable for non-normal data or data that is discontinuous in scale, and shows most of the species close to the origin of the axes, only the most abundant species or those with the greatest weight are separated at the first crossing, in the rest there is no defined pattern. The sea bottom, as it presents physical conditions of great stability, presents a reduced biodiversity where biotic variables, such as competitive exclusion, resource division, and predation, are essential factors that define the structure and functioning of the communities of mega crustaceans in this area.

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