Between brackets is the number of accepted extant species

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- Decapoda (17 683)
- Suborder Decapoda incertae sedis †
- Suborder Dendrobranchiata (533)
- Suborder Euzygida accepted as Stenopodidea
- Suborder Heterochelida
- Suborder Macrura
- Suborder Macrura reptantia
- Suborder Natantia
- Suborder Pleocyemata (17 150)
- Infraorder Achelata (153)
- Infraorder Anomura (3 414)
- Infraorder Astacidea (783)
- Infraorder Axiidea (600)
- Infraorder Brachyura (7 883)
- Infraorder Callianassidea accepted as Axiidea
- Infraorder Caridea (3 919)
- Infraorder Gebiidea (252)
- Family Axianassidae Schmitt, 1924 accepted as Laomediidae Borradaile, 1903
- Family Gebiadae Haworth, 1825 accepted as Upogebiidae Borradaile, 1903
- Family Kuwaitupogebiidae Sakai, Türkay & Al Aidaroos, 2015 accepted as Upogebiidae Borradaile, 1903
- Family Laomediidae Borradaile, 1903 (42)
- Family Thalassinidae Latreille, 1831 (12)
- Genus Thalassina Latreille, 1806 (12)
- Species Thalassina anomala (Herbst, 1804)
- Subspecies Thalassina anomala squamifera De Man, 1915 accepted as Thalassina gracilis Dana, 1852
- Variety Thalassina anomala var. squamifera De Man, 1915 accepted as Thalassina squamifera De Man, 1915
- Species Thalassina antiqua Bell, 1844 † accepted as Thalassina emerii Bell, 1844
- Species Thalassina australiensis Sakai & Türkay, 2012
- Species Thalassina cangioensis Marin, Kolevatov & Nguyễn, 2024
- Species Thalassina chilensis Steenstrup & Lutken, 1862 accepted as Thalassina anomala (Herbst, 1804)
- Species Thalassina emerii Bell, 1844
- Species Thalassina gracilis Dana, 1852
- Species Thalassina grandidactylus Robineau-Desvoidy, 1849 †
- Species Thalassina kelanang Moh & Chong, 2009
- Species Thalassina krempfi Ngoc-Ho & de Saint Laurent, 2009
- Species Thalassina littoralis Risso, 1816 accepted as Upogebia pusilla (Petagna, 1792)
- Species Thalassina maxima Hess, 1865 accepted as Thalassina anomala (Herbst, 1804)
- Species Thalassina pratas Lin, Komai & Chan, 2016
- Species Thalassina saetichelis Sakai & Türkay, 2012
- Species Thalassina scabra Leach, 1814 accepted as Thalassina anomala (Herbst, 1804)
- Species Thalassina scorpionides Latreille, 1806 accepted as Thalassina anomala (Herbst, 1804)
- Species Thalassina spinirostris Ngoc-Ho & de Saint Laurent, 2009
- Species Thalassina spinosa Ngoc-Ho & de Saint Laurent, 2009
- Species Thalassina squamifera De Man, 1915
- Species Thalassina talpa White, 1847
- Species Thalassina tsuyamensis Ando & Kishimoto in Ando, Kishimoto & Kawano, 2016 †
- Species Thalassina yamato Ando & Kishimoto in Ando, Kishimoto & Kawano, 2016 †
- Family Upogebiidae Borradaile, 1903 (198)
- Infraorder Glypheidea (2)
- Infraorder Palaeopalaeomonida †
- Infraorder Polychelida (38)
- Infraorder Procarididea (6)
- Infraorder Stenopodidea (100)
- Suborder Reptantia
- Suborder Trichelida