Gammarella brevicaudata Bate, 1862 – synonym of Gammarella fucicola
Gammarella normanni Bate and Westwood, 1862 – synonym of Gammarella fucicola
Gammarella orchestiformis Bate, 1857 – synonym of Gammarella fucicola
Gammarellus carinatus Rathke, 1837 – synonym of Gammarellus angulosus
Gammaropsis cornuta Auct. – synonym of Megamphopus cornutus
Gammaropsis erythrophthalma Sars, 1894 – synonym of Gammaropsis maculata
Gammaropsis nana Sars, 1894 – synonym of Gammaropsis palmata
Gammarus (Marinogammarus) stoerensis Stephensen, 1938 – synonym of Echinogammarus stoerensis
Gammarus (Marinogamrnarus) greenfieldi Shoemaker, 1938 – synonym of Gammarus finmarchicus
Gammarus (Pectenogammarus) planicrurus Reid, 1940 – synonym of Echinogammarus planicrurus
Gammarus angulosus Rathke, 1843 – synonym of Gammarellus angulosus
Gammarus anomalus Rathke, 1843 – synonym of Microdeutopus anomalus
Gammarus assimilis Liljeborg, 1852 – synonym of Cheirocratus assimilis
Gammarus brevicaudatus Bate, 1857 – synonym of Elasmopus rapax
Gammarus corniger Fabricius, 1779 – synonym of Epimeria cornigera
Gammarus dentatus Kröyer, 1842 – synonym of Melita dentata
Gammarus duebenii Liljeborg, 1852 – synonym of Gammarus duebeni
Gammarus dulongii Audouin, 1826 – synonym of Tanais dulongii
Gammarus locusta Spooner, 1947 – synonym of Gammarus insensibilis
Gammarus longimanus Bate, 1857 – synonym of Maera othonis
Gammarus loveni Bruzelius, 1859 – synonym of Maera loveni
Gammarus maculatus Johnston, 1828 – synonym of Gammaropsis maculata
Gammarus marinus var. stoerensis Reid, 1938 – synonym of Echinogammarus stoerensis
Gammarus olivii Milne-Edwards, 1830 – synonym of Gammarus marinus
Gammarus othonis Milne-Edwards, 1830 – synonym of Maera othonis
Gammarus pedatus Abildgaard, 1789 – synonym of Phtisica marina
Gammarus plumicornis Pirlot, 1939 – synonym of Gammarus crinicornis
Gammarus quadrilobatus.-Abildgaard, 1789 – synonym of Caprella linearis
Gammarus spinicarpus Abildgaard, 1789 – synonym of Leucothoe spinicarpa
Gammarus sundevallii Rathke, 1843 – synonym of Cheirocratus sundevallii
Gammarus tenuimanus Bate, 1862 – synonym of Maerella tenuimana
Gammarus zaddachi oceanicus Segerstråle, 1947 – synonym of Gammarus oceanicus
Gammarus zaddachi salinus Spooner, 1947 – synonym of Gammarus salinus
Gammarus zaddachi Sexton, 1942 (part) – synonym of Gammarus salinus
Gammarus zaddachi zaddachi Spooner, 1947 – synonym of Gammarus zaddachi
Ganimarus homari Fabricius, 1798 – synonym of Gammarellus homari
Gastrosaccus sanctus Norman, 1868 – synonym of Gastrosaccus spinifer
Gelasimus bellii Couch, 1838 – synonym of Goneplax rhomboides
Glyptonotus entomon Miers, 1883 – synonym of Saduria entomon
Gonoplax bispinosa Leach, 1816 – synonym of Goneplax rhomboides