Brachyura: Potamoidea: Potamonautidae, Platythelphusidae, Deckeniidae () Author Reed, Sadie K. Author Cumberlidge, Neil text Zootaxa 2006 2006-07-17 1262 1 1 139 https://biotaxa.org/Zootaxa/article/view/zootaxa.1262.1.1 journal article 10.11646/zootaxa.1262.1.1 1175­5334 5065350 Key to the species of Platythelphusa 1 Anterior margin of front deflexed, lacking well­defined teeth on external corners..... 2 ­ Anterior margin of front almost horizontal, with well­defined sharp teeth on external corners ........................................................................................................................ 3 2 External angles of front rounded, frontal margin granular. Small epibranchial tooth, one larger tooth on anterolateral margin in mesogastric region (Pl. XXIV)................... .............................................................................................................. P. praelongata ­ External angles of front square­shaped ......................................................................... 4 3 Frontal margin lined with tooth­like tubercles ............................................................. 7 ­ Frontal margin lined by granules ................................................................................ 8 4 Merus of p5 shorter than front width. One tooth on the anterolateral tooth behind the epibranchial tooth, equal in size to the epibranchial tooth (Pl. XXIII) ............. P. polita ­ Merus of p5 either longer than, or almost equal to, front width .................................. 5 5 Epibranchial lobes distinctly raised. Inferior margin of ischium of p1–p5 with distal spine (Pl. XXV)....................................................................................... P. tuberculata ­ Epibranchial lobes indistinct. Distal spine on inferior margin of ischium of p1–p5 lacking ........................................................................................................................ 6 6 Inferior margins of meri and propodi of p2–p4 each with a row of distinct spines (Pl. XX) ...................................................................................................................... P. echinata ­ Inferior margins of meri of p2–p4 granulate, inferior margins of propodus of p2 with several minute spines, inferior margins of propodus of p3–p4 smooth (Pl. XXII)......... .................................................................................................................... P. maculata 7 Distal tooth of meri of p2–p4 pointed spine (Pl. XVIII).......................... P. conculcata ­ Distal tooth of meri of p2–p4 either low or lacking..................................................... 8 8 Subdistal tooth of meri of p2–p4 either low or lacking (Pl. XVII) ................ P.armata ­ Subdistal tooth of meri of p2–p4 a sharp spine............................................................ 9 9 Carapace flattened (ch/fw <1.0) (Pl. XXI).............................................. P. immaculata ­ Carapace high (ch/fw>1.0) (Pl. XVII) .................................................... P. denticulata