Arcuatasigma G.Reid, 2012 (original description)
Arcuatasigma addu G.Reid, 2012 (original description)
Arcuatasigma castracanense G.Reid, 2012 (original description)
Arcuatasigma challengeriense (Castracane) G.Reid, 2012 accepted as
Toxonidisigma challengeriense (Castracane) Lobban & G. Reid, 2018 (original description)
Arcuatasigma closterioides (Grunow) G.Reid, 2012 (new combination reference)
Carinasigma G.Reid, 2012 (original description)
Carinasigma angustatum (Donkin) G.Reid, 2012 (new combination reference)
Carinasigma latum (E.J.Cox) G.Reid, 2012 (new combination reference)
Carinasigma minuta (Donkin) G.Reid, 2012 (original description)
Carinasigma rectum (Donkin) G.Reid, 2012 (new combination reference)
Cochlearisigma G.Reid, 2012 (original description)
Cochlearisigma falcatum (Donkin) G.Reid, 2012 (new combination reference)
Cochlearisigma falcatum var. adriaticum (Grunow) G.Reid, 2012 (new combination reference)
Cochlearisigma incertum (H.Peragallo) G.Reid, 2012 (new combination reference)
Cochlearisigma maroccanum (Cleve ex H.Paragallo) G.Reid, 2012 (new combination reference)
Cochlearisigma ohsinsinum G.Reid, 2012 (original description)
Cochlearisigma weissflogii (Grunow) G.Reid, 2012 (new combination reference)
Costasigma G.Reid, 2012 (original description)
Costasigma simmsiae G.Reid, 2012 (original description)
Costasigma staurophorum (Grunow) G.Reid, 2012 (new combination reference)
Donkinia lipscombensis G.Reid, 2012 (original description)