A new species of Louisea Cumberlidge, 1994, a freshwater crab from the Ekom-Nkam Waterfall, Cameroon (Brachyura: Potamonautidae: Liberonautinae) Author Mvogo Ndongo, Pierre A. 0000-0003-1581-2557 Département de Gestion des Écosystèmes Aquatiques, Institut des Sciences Halieutiques, Université de Douala à Yabassi, Douala- Bassa P. O. Box 7236, Cameroon. & Museum fur Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115 Berlin, Germany. & Unit of Biodiversity Discovery and Conservation, Cameroon Association for Research on Crustaceans and Others Aquatic Resources, Obala P. O. Box 43, Cameroon. mpierrearmand@yahoo.fr Author Rintelen, Thomas Von 0000-0002-6253-3078 Museum fur Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115 Berlin, Germany. thomas.vonrintelen@mfn.berlin Author Clark, Paul F. 0000-0001-6862-3982 Department of Life Sciences, The Natural History Museum, London, SW 7 5 BD, UK. p.clark@nhm.ac.uk Author Cumberlidge, Neil 0000-0002-0568-6414 Department of Biology, Northern Michigan University, Marquette, MI 49855 - 5376, USA. ncumberl@nmu.edu text Zootaxa 2025 2025-02-20 5590 1 113 123 https://doi.org/10.11646/zootaxa.5590.1.6 journal article 308650 10.11646/zootaxa.5590.1.6 cf251876-814b-453a-a1c9-a2b49d6843f4 1175-5326 14952808 5CE85AE2-74D5-4E66-8720-272E3CB1B9F3
TABLE 2. Differences between the five species of Louisea.
CharacterL. cataracta sp. nov.L. nkongsambaL. yabassiL. balssiL. edeaensis
Postfrontal 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 ends
Major 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 touching
Major 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 distally
Cheliped 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 subequal
Cheliped 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 teeth
Sternal 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 margins
Sternal 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 obscure
Sternal segment S4Side margins flatSide margins raised, thickenedSide margins flatSide margins flatSide margins flat
Sternal segment S3Side margins flatSide margins raised, thickenedSide margins flatSide margins raised, thickenedSide margins flat