Taxa;Characters ;N;"Shell shape";"Max. height × width (mm)";Periostracum;Eye;"Body pigment";"Intestine shape";Localities "P. ribeirensis (e)";50;Globose;5.7×3.7;"Dark brown";+;"Black (hom.)";"U-shapped (sensu Simone & Moracchioli, 1994)";"≈ Iporanga" "Potamolithus sp. 1 (e)";44;Fusiform;2.8×2.2;"Light brown";+;"Black spots along the body";"Type 2";"≈ Betari, Água Quente, Morro Preto" "P. karsticus (tph)";27;Fusiform;2.7×1.8;"Dark brown";+;"Black spots along the body";"Type 1 - left";"≈ Calcário Branco; W Calcário Branco" "Potamolithus sp. 2 (tph)";43;Fusiform;2.8×1.7;"Light brown";+;Depigmented;"Type 1 - right";"≈ Ouro Grosso; W Ouro Grosso (close to cave resurgence)" "Potamolithus sp. 3 (tph)";46;Fusiform-globose;3.6×2.3;"Light brown";+;"Black tentacles";"Type 2";"≈ Alambari; W Alambari de Baixo" "Potamolithus sp. 4 (tph)";36;Fusiform-globose;2.8×1.3;"Pale yellow";+;Depigmented;"Type 1 - left";"≈ Água Suja; W Água Suja" "Potamolithus sp. 5 (tph)";68;Fusiform-globose;2.8×1.7;"Pale yellow/Translucent";+;Depigmented;"Type 2";"≈ Roncador; W Santana, Pérolas" "Potamolithus sp. 6 (tph)";50;Fusiform;2.7×1.5;"Light brown";+;"Black spots between eyes";"Type 1 - left";"≈ Maximiano; W Casa de Pedra, Água Sumida" "Potamolithus sp. 7 (tph)";15;Fusiform;2.0×1.0;Brown;+;"Black stripes in the dorsal region";"Type 1 - left";"≈ Rio das Ostras; W Tapagem" "P. troglobius (tb)";70;Globose;2.8×2.1;Translucent/White;-;Depigmented;"Type 4";"Ω Areias System" "Potamolithus aff. troglobius (tb) (cited as Potamolithus sp. 2 in Bichuette and Trajano 2003)";82;Globose;3.2×2.3;Translucent/White;-;Depigmented;"Type 4";"Ω Alambari de Cima" "Potamolithus sp. 8 (tb)";57;Globose;2.3×1.3;Translucent;+/-;Depigmented;"Type 5";"Ω Couto, Morro Preto" "Potamolithus sp. 9 (tb)";35;Globose;3.9×2.9;White;+/-;Depigmented;"Type 3";"Ω Pescaria" "Potamolithus sp. 10 (tb)";17;Fusiform;2.6×1.4;Translucent;-;Depigmented;"Type 4";"Ω Betari de Baixo" "Potamolithus sp. 11 (tb)";30;Globose;2.4×1.7;Translucent;-;Depigmented;"Type 1-left";"Ω Jeremias" "Potamolithus sp. 12 (tb)";17;Fusiform;1.8×1.1;"Pale yellow";-;Depigmented;"Type 2";"Ω Colorida"