Species (121)
- Notolimea crassa ssp. crassa
- Hanzawaia crassa ssp. crassa
- Cinetoconia crassa ssp. crassa
- Antrodia crassa (P. Karst.) Ryvarden 1973
- Amyloporia crassa (P. Karst.) Bondartsev & Singer ex Bondartsev 1953
- Amyloporiella crassa (P. Karst.) A. David & Torti? 1984
- Crassa pulverosella (Heinemann, 1870)
- Crassa tinctella (Hübner, 1796)
- Crassa unitella (Hübner, 1796)
- Eurymniusa crassa Eppelsh.
- Crassagrotis crassa Hübner, 1803
- Arcopagia crassa
- Agrotis crassa Hübner, 1803
- Spisula crassa
- Trochilia crassa sensu Levander 1894
- Ampullarius crassa Swainson
- Robulina crassa Roemer
- Hanzawaia crassa Luczkowska 1955
- Trochiloides crassa Levander 1894
- Buccinopsis crassa
- Bursa crassa
- Dentalina crassa
- Emarginula crassa
- Amiba crassa
- Amphista crassa
- Amoeba crassa
- Chaenia crassa
- Cinetoconia crassa ssp. alpha var.
- Cinetoconia crassa ssp. beta var.
- Melanella crassa
- Melania crassa
- Pleuronema crassa
- Ploesconia crassa
- Pulvinulina crassa
- Anodonta crassa
- Oberhauserella crassa
- Coccudina crassa
- Leptoxis crassa
- Partulina crassa
- Athearni crassa
- Attheyella crassa
- Phasianella crassa
- Eutropia crassa
- Trocholina crassa
- Cristellaria crassa d'Orbigny 1846
- Marssonella crassa Marsson ()
- Cornuspira crassa Kübler & Zwingli 1870
- Gaudryina crassa Karrer 1870
- Staurosphaera crassa Dunikowski 1882
- Trocholina crassa Kristan 1957
- Cassidulina crassa d'Orbigny 1839
- Hanzawaia crassa Luczkovska () ssp. cf.
- Notolimea crassa
- Notolimea crassa ssp. laminifera
- Notolimea crassa ssp. sarsi
- Monodonta crassa
- Tellina crassa
- Hexamita crassa Klebs
- Tracheloraphis crassa Raikov 1962
- Holosticha crassa Claparède & Lachmann 1858
- Noctua crassa Hübner, 1803
- Thigmokeronopsis crassa Claparède & Lachmann 1858
- Dunhevedia crassa King
- Cinetoconia crassa Renault & Roche 1898
- Legendrea crassa Penard 1922
- Metacylis crassa Gourret & Roeser 1886
- Metacystis crassa Gourret & Roeser 1886
- Chaenea crassa Maskell 1887
- Cavichona crassa Jankowski 1973
- Attheyella crassa Sars 1862
- Cymatocylis crassa Kofoid & Campbell 1929
- Oxytricha crassa Claparède & Lachmann 1858
- Penardiella crassa Penard 1922
- Vespa crassa Herrich-Schäffer, 1841
- Siphonochalina crassa
- Seriastraea crassa Roniewicz 1989
- Fenchelia crassa Fenchel 1965
- Huxleya crassa Claparède & Lachmann 1859
- Isochona crassa Jankowski 1973
- Planicola crassa Dumas 1929
- Rhopalophrya crassa Kahl 1926
- Solenophrya crassa Claparède & Lachmann 1859
- Trochilia crassa Claparède & Lachmann 1859
- Trochilioides crassa Levander 1894
- Trichotaxis crassa Claparède & Lachmann 1858
- Vaginicola crassa Dumas 1929
- Ropalidia crassa Vecht, 1941 1941
- Phanerotomella crassa Zettel 1989
- Hjortstamia crassa (Lév.) Boidin & Gilles 2003
- Sarcosphaera crassa (Santi ex Steudel) Pouzar 1972
- Peniophora crassa Burt 1915
- Tellina crassa Pennant 1777
- Pseudoliva crassa Gmelin
- Fissurella crassa Lamarck
- Omalostraca crassa
- Unio crassa
- Manzonia crassa
- Huperzia crassa (Humb. & Bonpl. ex Willd.) Rothm.
- Tenthredo crassa Scopoli 1763