Donkinia recta var. angusta (Donkin) H. Peragallo, 1891 accepted as Pleurosigma angustum Donkin, 1858 (new combination reference)
Donkinia recta var. intermedia H. Peragallo, 1891 (original description)
Donkinia recta var. thumii (Cleve in H. Peragallo) Peragallo & Peragallo, 1891 accepted as Donkinia thumii H. Peragallo, 1891 (new combination reference)
Donkinia thumii H. Peragallo, 1891 (original description)
Pleurosigma abruptum H. Peragallo, 1891 (original description)
Pleurosigma acutum var. japonicum H. Peragallo, 1891 (original description)
Pleurosigma acutum var. pelagicum H. Peragallo manus. ex H. Peragallo, 1891 (original description)
Pleurosigma aestuarii var. candida (Schumann) H. Peragallo, 1891 accepted as Pleurosigma candidum Schumann, 1867 (new combination reference)
Pleurosigma affine var. interruptum H. Peragallo, 1891 (original description)
Pleurosigma affine var. normanni (Ralfs in Pritchard) H. Peragallo, 1891 (new combination reference)
Pleurosigma angulatum var. finmarchica (Cleve in Cleve & Moller; Cleve ex Grunow) H. Peragallo, 1891 accepted as Pleurosigma finmarchicum Cleve in Cleve & Moller, 1882 (new combination reference)
Pleurosigma antillarum H. Peragallo, 1891 (original description)
Pleurosigma asiaticum (Tempère & Brun) H.Peragallo, 1891 accepted as Staurosigma asiaticum Tempère & Brun, 1889 † (new combination reference)
Pleurosigma barbadense Grunow, 1880 accepted as Pleurosigma marinum var. barbadense Grunow in Cleve & Möller, 1878 (new combination reference)
Pleurosigma brunii Cleve ex H. Peragallo, 1891 (original description)
Pleurosigma clevei var. fossilis Brun ex H. Peragallo, 1891 (original description)
Pleurosigma convexum (Grunow in Cleve & Grunow) H. Peragallo, 1891 accepted as Pleurosigma strigosum var. convexum Grunow in Cleve & Grunow, 1880 (new combination reference)
Pleurosigma cuspidatum var. cuspidatum (Cleve) H. Peragallo, 1891 accepted as Pleurosigma lanceolatum var. cuspidatum Cleve, 1881 (new combination reference)
Pleurosigma decorum var. americanum H. Peragallo, 1891 (original description)
Pleurosigma decorum var. dalmaticum sensu H. Peragallo, 1891 (original description)
Pleurosigma decorum var. inflatum H. Peragallo, 1891 (original description)
Pleurosigma delicatulum var. clevei (Grunow in Cleve & Grunow) H. Peragallo, 1891 accepted as Pleurosigma clevei var. clevei Grunow in Cleve & Grunow, 1880 (new combination reference)
Pleurosigma delicatulum var. elegantissimum (Castracane) H. Peragallo, 1891 accepted as Pleurosigma elegantissimum Castracane, 1886 (new combination reference)
Pleurosigma delicatulum var. macilentum H. Peragallo, 1891 (original description)
Pleurosigma elongatum var. balearicum H. Peragallo, 1891 (original description)
Pleurosigma elongatum var. gracilescens (Grunow in Cleve & Grunow) H. Peragallo, 1891 (new combination reference)
Pleurosigma fasciolum var. arcuatum (Donkin) H. Peragallo, 1891 accepted as Pleurosigma arcuatum Donkin, 1857 (new combination reference)
Pleurosigma fasciolum var. macrum (W.Smith) H.Peragallo, 1891 accepted as Pleurosigma macrum W.Smith, 1853 (new combination reference)
Pleurosigma fasciolum var. prolongatum (W. Smith) H. Peragallo, 1891 accepted as Pleurosigma prolongatum var. prolongatum W. Smith, 1852 (new combination reference)
Pleurosigma formosum var. balearica H.Peragallo accepted as Pleurosigma balearicum Cleve & Grunow in Cleve & Moller, 1878 (new combination reference)
Pleurosigma gallicum (Grunow in Van Heurck) H. Peragallo, 1891 accepted as Pleurosigma scalprum var. gallicum Grunow in Van Heurck, 1880-1885 (new combination reference)
Pleurosigma grovesii Cleve ex H. Peragallo, 1891 (original description)
Pleurosigma hyperborea (Grunow in Cleve & Grunow) H. Peragallo, 1891 accepted as Pleurosigma tenuissimum var. hyperborea Grunow in Cleve & Grunow, 1880 (new combination reference)
Pleurosigma ibericum H. Peragallo, 1891 (original description)
Pleurosigma intermedium var. directum (Grunow in Cleve & Grunow) H. Peragallo, 1891 accepted as Pleurosigma directum var. directum Grunow in Cleve & Grunow, 1880 (new combination reference)
Pleurosigma intermedium var. subrectum H. Peragallo, 1891 (original description)
Pleurosigma italicum H. Peragallo, 1891 (original description)
Pleurosigma javanicum H. Peragallo, 1891 (original description)
Pleurosigma latiusculum H. Peragallo, 1891 (original description)
Pleurosigma longum var. kerguelense (Grunow in Cleve & Grunow) H. Peragallo, 1891 accepted as Pleurosigma kerguelense var. kerguelense Grunow in Cleve & Grunow, 1880 (new combination reference)
Pleurosigma longum var. subrigida (Grunow in Cleve & Moller; Grunow in Cleve & Grunow) H. Peragallo, 1891 accepted as Pleurosigma subrigidum Grunow, 1880 (new combination reference)
Pleurosigma macilentum H.Peragallo, 1891 (original description)
Pleurosigma marinum var. antillarum H. Peragallo, 1891 (original description)
Pleurosigma marinum var. ibericum H. Peragallo, 1891 (original description)
Pleurosigma marinum var. italica H. Peragallo, 1891 (original description)
Pleurosigma naviculaceum var. hungaricum (Cleve & Brun in Brun & Tempère) H. Peragallo, 1891 accepted as Pleurosigma hungaricum Cleve & Brun in Brun & Tempère, 1889 (new combination reference)
Pleurosigma nicobaricum var. indica H. Peragallo, 1891 (original description)
Pleurosigma nicobaricum var. sagitta (Tempère & Brun in Brun & Tempère) H. Peragallo, 1891 accepted as Pleurosigma sagitta var. sagitta Tempère & Brun in Brun & Tempère, 1889 (new combination reference)
Pleurosigma nubecula var. thumii Castracane ex H. Peragallo, 1891 (original description)
Pleurosigma obscurum var. diminuta H. Peragallo, 1891 (original description)
Pleurosigma o'mearii (Grunow in Cleve & Grunow) H. Peragallo, 1891 (new combination reference)
Pleurosigma paradoxum H.Peragallo, 1891 (original description)
Pleurosigma peragalli var. peragalli Brun in H. Peragallo, 1891 (original description)
Pleurosigma rhombeum var. latum H. Peragallo, 1891 (original description)
Pleurosigma rhombeum var. rhombeum (Grunow in Cleve & Grunow) H. Peragallo, 1891 accepted as Pleurosigma quadratum var. rhombeum Grunow in Cleve & Grunow, 1880 (new combination reference)
Pleurosigma rigidum var. gruendleri (Grunow in Cleve & Grunow) H. Peragallo, 1891 (new combination reference)
Pleurosigma rigidum var. incurvata Brun in H. Peragallo, 1891 (original description)
Pleurosigma sinense var. constrictum H. Peragallo, 1891 (original description)
Pleurosigma sinense var. reversum H. Peragallo, 1891 (original description)
Pleurosigma speciosum var. abruptum H. Peragallo, 1891 (original description)
Pleurosigma speciosum var. gracilis H. Peragallo, 1891 (original description)
Pleurosigma speciosum var. javanicum H. Peragallo, 1891 (original description)
Pleurosigma speciosum var. sumatricum H. Peragallo, 1891 (original description)
Pleurosigma speciosum var. tahitense (Castracane) H. Peragallo, 1891 (new combination reference)
Pleurosigma spectabile Grunow, 1891 (original description)
Pleurosigma spenceri var. febigeri (Grunow in Cleve & Moller; Grunow in Cleve & Grunow) H. Peragallo, 1891 accepted as Pleurosigma febigeri Grunow in Cleve & Möller, 1879 (new combination reference)
Pleurosigma spenceri var. scalproides (Rabenhorst) H. Peragallo, 1891 (new combination reference)
Pleurosigma spenceri var. subsalinum H. Peragallo, 1891 (original description)
Pleurosigma stuxbergii f. rhomboides (Cleve in Cleve & Grunow) H. Peragallo, 1891 accepted as Pleurosigma rhomboides var. rhomboides Cleve in Cleve & Grunow, 1880 (new combination reference)
Pleurosigma stuxbergii var. diminuta H. Peragallo, 1891 (original description)
Pleurosigma stuxbergii var. latiuscula H. Peragallo, 1891 (original description)
Pleurosigma stuxbergii var. minor H. Peragallo, 1891 (original description)
Pleurosigma subsalinum H.Peragallo, 1891 accepted as Pleurosigma spenceri var. subsalinum H. Peragallo, 1891 (original description)
Pleurosigma sumatricum H. Peragallo, 1891 (original description)
Pleurosigma terryanum H.Peragallo, 1891 (original description)
Pleurosigma thumii Cleve ex H. Peragallo, 1891 (original description)
Pleurosigma vitrea var. kjellmanii H. Peragallo, 1891 (original description)
Rhoicosigma arcticum var. irregulare H. Peragallo, 1891 (original description)
Rhoicosigma compactum var. curvatum Grunow ex H. Peragallo, 1891 (original description)
Rhoicosigma corsicanum H. Peragallo, 1891 (original description)
Rhoicosigma curvatum Grunow ex H. Peragallo, 1891 (original description)
Rhoicosigma incertum H.Peragallo, 1891 (original description)
Rhoicosigma irregulare H. Peragallo, 1891 (original description)
Rhoicosigma lineare (Grunow in Cleve & Grunow) H. Peragallo, 1891 accepted as Pleurosigma lineare Grunow in Cleve & Möller, 1879 (new combination reference)
Rhoicosigma maroccanum Cleve ex H.Peragallo, 1891 (original description)
Rhoicosigma mediterraneum var. calcarea Brun in H. Peragallo, 1891 (original description)
Rhoicosigma oceanicum f. oceanicum H. Peragallo, 1891 (original description)
Rhoicosigma oceanicum var. corsicana H. Peragallo, 1891 (original description)
Rhoicosigma robustum var. inflexa H. Peragallo, 1891 (original description)
Rhoicosigma thaitiense (Castracane) H. Peragallo, 1891 (new combination reference)
Toxonidea balearica Grunow in H. Peragallo, 1891 (original description)
Toxonidea madagascarensis Grunow ex H. Peragallo, 1891 (original description)