Results of the outlying mean index (OMI) for C. xikrin sp. nov. and C. amazonicum 39 principal component analysis (PCA) of the environmental variables showing the covariation of variables in relation to the cave and the niche representation 40 representation of the occupied niche for the analyzed species in relation to the environmental variables. The black dots represent the sampling points, corresponding to each cave alt altitude area the area of the cave flour hp horizontal projection OM diversity of organic matter resources available slope the slope of the cave flour vol cave volume