Synasellus is a genus of isopod crustaceans in the family Asellidae. It contains the following species:
Synasellus albicastrensis Braga, 1960Synasellus barcelensis Noodt & Galhano, 1969Synasellus bragai Afonso, 1987Synasellus bragaianus Henry & Magniez, 1987Synasellus brigantinus Braga, 1959Synasellus capitatus (Braga, 1968)Synasellus dissimilis Afonso, 1987Synasellus exiguus Braga, 1944Synasellus favaiensis Eiras, 1974Synasellus flaviensis Afonso, 1996Synasellus fragilis Braga, 1946Synasellus henrii Afonso, 1987Synasellus hurki Henry & Magniez, 1995Synasellus insignis Afonso, 1984Synasellus intermedius Afonso, 1985Synasellus lafonensis Braga, 1959Synasellus leysi Henry & Magniez, 1995Synasellus longicauda Braga, 1959Synasellus longicornis Afonso, 1978Synasellus mariae (Braga, 1942)Synasellus mateusi Braga, 1954Synasellus meijersae Henry & Magniez, 1987Synasellus meirelesi Braga, 1959Synasellus minutus Braga, 1967Synasellus nobrei Braga, 1967Synasellus notenboomi Henry & Magniez, 1987Synasellus pireslimai Braga, 1959Synasellus pombalensis Afonso, 1987Synasellus robusticornis Afonso, 1987Synasellus serranus Braga, 1967Synasellus tirsensis Afonso, 1987Synasellus transmontanus Braga, 1959Synasellus valpacensis Afonso, 1996Synasellus vidaguensis Afonso, 1996Synasellus vilacondensis Afonso, 1987