TABLE 2. Differences between the five species of Louisea. CharacterL. cataracta sp. nov.L. nkongsambaL. yabassiL. balssiL. edeaensisPostfrontal crestComplete, traversing entire carapaceIncomplete, obscure between epigastric crests and lateral endsComplete, traversing entire carapaceIncomplete, obscure between epigastric crests and lateral endsIncomplete, obscure between epigastric crests and lateral endsMajor chela dactylusSlightly curved, leaving long narrow interspace when chela tips touchingSlightly curved, leaving long narrow interspace when chela tips touchingSlightly curved, leaving long narrow interspace when chela tips touchingHighly arched, leaving oval interspace when chela tips touchingSlightly curved, leaving long narrow interspace when chela tips touchingMajor cheliped propodus dentition3 teeth proximally, 1 tooth distally3 teeth proximally, 1 tooth distally3 teeth proximally, 1 tooth distally2 teeth proximally, 2 teeth distally3 teeth proximally, 1 tooth distallyCheliped carpus inner margin teethDistal tooth long & pointed, proximal tooth subequalDistal tooth long & pointed, proximal tooth subequalDistal tooth long & pointed, proximal tooth subequalDistal tooth small & blunt, proximal tooth subequalDistal tooth long & pointed, proximal tooth subequalCheliped carpus inner margin teethSmall granular tooth between distal & proximal teethSmall granular tooth between distal & proximal teethSmall granular tooth between distal & proximal teethNo granular tooth between distal & proximal teethSmall granular tooth between distal & proximal teethSternal sulcus S2/3Incomplete, not traversing sternum, lateral ends not meeting sternal side marginsComplete lateral ends meeting sternal side marginsComplete lateral ends meeting sternal side marginsComplete lateral ends meeting sternal side marginsComplete lateral ends meeting sternal side marginsSternal sulcus S3/4Incomplete, not traversing sternum, reduced to short sections at the lateral ends, otherwise obscureIncomplete, not traversing sternum, long sections at the lateral ends, short mid part obscureIncomplete, not traversing sternum, reduced to short sections at the lateral ends, otherwise obscureIncomplete, not traversing sternum, reduced to short sections at the lateral ends, otherwise obscureIncomplete, not traversing sternum, long sections at the lateral ends, short mid part obscureSternal segment S4Side margins flatSide margins raised, thickenedSide margins flatSide margins flatSide margins flatSternal segment S3Side margins flatSide margins raised, thickenedSide margins flatSide margins raised, thickenedSide margins flat

Published as part of Mvogo Ndongo, Pierre A., Rintelen, Thomas Von, Clark, Paul F. & Cumberlidge, Neil, 2025, A new species of Louisea Cumberlidge, 1994, a freshwater crab from the Ekom-Nkam Waterfall, Cameroon (Brachyura: Potamonautidae: Liberonautinae), pp. 120 in Zootaxa 5590 (1) on page 120, DOI: 10.11646/zootaxa.5590.1.6, http://zenodo.org/record/14952808