there are four species of "arumberia that" have been formally recognized. "arumberia banksi" has thin siliciclastic biolaminites known as rugose structures including those with subparallel or fanning-out series of rugae ("arumberia banksi" s.str.) and sub-parallel series of branching rugae ("arumberia vindhyanensis"). the "arumberia multykensis" variety is found in greenish gray siltstones as series of near-parallel ridges with positive hyporelief up to 1 mm wide and 0.5 mm high, with 10 mm spacing between the ridges while "a. usavaensis" occurs as a series of near parallel ridges on the wavy surfaces on linguoid ripple marks which stretch along the paleoflow direction and flatten out as microterraces on the leeward side of the ripples". arumberia usavensis is found on both upper and lower surfaces of sandstone beds as well as inside sandstones and siltstones". "arumberia beckeri" and "arumberia ollii" are morphologically distinct from "a. banksi" and are filamentous and ribbon-shaped compressed macrofossils which host authigenic clay minerals and are most likely unrelated to "arumberia".