Ancylus compressus Nyst, 1845 † (original description)
Buccinum crassiusculum Nyst, 1845 accepted as Nassarius crassiusculus (Nyst, 1845) (original description)
Buccinum spectabile Nyst, 1845 † accepted as Tritia spectabilis (Nyst, 1845) † (original description)
Cancellaria granulata Nyst, 1845 † accepted as Unitas granulata (Nyst, 1845) † (original description)
Cardita latisulca Nyst, 1845 † (original description)
Cardita omaliana Nyst, 1845 † accepted as Scalaricardita omaliana (Nyst, 1845) † (original description)
Cardita squamulosa Nyst, 1845 † accepted as Cardites squamulosa (Nyst, 1843) † (original description)
Caryophyllia multostellata Nyst, 1845 † (original description)
Cerithium variculosum Nyst, 1845 † accepted as Bittium sublima (A. d'Orbigny, 1852) † (original description)
Corbula arnouldii Nyst, 1845 † accepted as Varicorbula arnouldii (Nyst, 1845) † (original description)
Corbulomya Nyst, 1845 accepted as Lentidium De Cristofori & Jan, 1832 (original description)
Crassatella landinensis Nyst, 1845 † (original description)
Fusus multisulcatus Nyst, 1845 † accepted as Scalaspira multisulcata (Nyst, 1845) † (original description)
Helix haesendonckii Nyst, 1845 † accepted as Cepaea haesendonckii (Nyst, 1845) † (original description)
Lucina galeottiana Nyst, 1845 † accepted as Gonimyrtea galeottiana (Nyst, 1845) † (original description)
Mactra striata Nyst, 1845 accepted as Spisula solida (Linnaeus, 1758) (original description)
Melania inflata Nyst, 1836 † accepted as Melania nystii Nyst, 1836 † accepted as Melanoides fasciata (J. Sowerby, 1819) † (source of synonymy)
Natica deshayesiana Nyst, 1845 † (original description)
Nucula galeottiana Nyst, 1845 † accepted as Saccella galeottiana (Nyst, 1845) † (original description)
Nucula philippiana Nyst, 1845 accepted as Yoldiella philippiana (Nyst, 1845) (original description)
Nucula ryckholtiana Nyst, 1845 † accepted as Leionucula ryckholtiana (Nyst, 1843) † (original description)
Nucula subtransversa Nyst, 1845 † (original description)
Pecten cretaceus Nyst, 1845 † accepted as Syncyclonema cretacea (Nyst, 1845) † (original description)
Pecten incurvatus Nyst, 1845 † (original description)
Pecten lamalii Nyst, 1845 † accepted as Karnekampia lilli (Pusch, 1837) † (original description)
Pecten liasinus Nyst, 1845 † accepted as Entolium lunare (F. A. Roemer, 1839) † (original description)
Pecten scabriusculus Nyst, 1845 † accepted as Mimachlamys plebeia (Lamarck, 1806) † (original description)
Pecten sowerbyi Nyst, 1845 † accepted as Aequipecten opercularis opercularis (Linnaeus, 1758) (original description)
Pecten sublaevigatus Nyst, 1845 † accepted as Aequipecten sublaevigatus (Nyst, 1845) † (original description)
Planorbis depressus Nyst, 1845 † accepted as Gyraulus bosqueti (Glibert & de Heinzelin de Braucourt, 1954) † (original description)
Rissoa dolium Nyst, 1845 accepted as Pusillina philippi (Aradas & Maggiore, 1844) (original description)
Rissoa duboisii Nyst, 1845 † (original description)
Rissoa philippiana Nyst, 1845 accepted as Parthenina suturalis (R. A. Philippi, 1844) (original description)
Rissoa succincta Nyst, 1845 † (original description)
Serpula (Sclerostyla) trochoides (Nyst, 1843) in Mörch, 1863 † (original description)
Solarium grande Nyst, 1845 † accepted as Climacopoma grande (Nyst, 1845) † (original description)
Spondylus auriculatus Nyst, 1845 † (original description)
Terebra basterotii Nyst, 1845 † accepted as Strioterebrum basterotii (Nyst, 1845) † (original description)
Teredo burtini Nyst, 1845 † accepted as Nausitora burtini (Nyst, 1845) † (original description)
Trigonocoelia goldfussii Nyst, 1845 † accepted as Oblimopa goldfussii (Nyst, 1845) † (original description)
Trochus dekinii Nyst, 1845 † accepted as Calliostoma simile (J. Sowerby, 1816) † (original description)
Turbinella pyruliformis Nyst, 1845 † accepted as Turehua pyruliformis (Nyst, 1845) † (original description)
Turbo firketi Nyst, 1845 † accepted as Calliomphalus firketi (Nyst, 1845) † (original description)
Turritella crenulata Nyst, 1845 † (original description)
Voluta semigranosa Nyst, 1845 accepted as Pisanella semigranosa (Nyst, 1845) † (original description)

Belgium for Ancylus compressus Nyst, 1845 † 
Belgium for Cardita latisulca Nyst, 1845 † 
Belgium for Cardita omaliana Nyst, 1845 † 
Belgium for Cardita squamulosa Nyst, 1845 † 
Belgium for Corbula arnouldii Nyst, 1845 † 
Belgium for Crassatella landinensis Nyst, 1845 † 
Belgium for Helix haesendonckii Nyst, 1845 † 
Belgium for Lucina galeottiana Nyst, 1845 † 
Belgium for Nucula galeottiana Nyst, 1845 † 
Belgium for Nucula ryckholtiana Nyst, 1845 † 
Belgium for Nucula subtransversa Nyst, 1845 † 
Belgium for Pecten incurvatus Nyst, 1845 † 
Belgium for Pecten sublaevigatus Nyst, 1845 † 
Belgium for Planorbis depressus Nyst, 1845 † 
Belgium for Planorbis depressus Nyst, 1845 † 
Belgium for Solarium grande Nyst, 1845 † 
Belgium for Spondylus auriculatus Nyst, 1845 † 
Belgium for Teredo burtini Nyst, 1845 † 
Belgium for Trochus dekinii Nyst, 1845 † 
Belgium for Turbo firketi Nyst, 1845 † 
Germany for Pecten liasinus Nyst, 1845 † 
Sweden for Pecten cretaceus Nyst, 1845 † 

 Nomenclature

 for Pecten cretaceus Nyst, 1845 †

New name for Pecten corneus Sowerby, sensu Nilsson, 1827 [details]

 Taxonomic remark

 for Pecten liasinus Nyst, 1845 †

Based on Pecten corneus sensu Goldfuss, 1836, non Sowerby, 1818 [details]

 Type locality

 for Planorbis depressus Nyst, 1845 †

Borgloon ("Looz") and Kleine-Spouwen ("Kleyn-Spauwen"), Limburg, Belgium; Rupelian, early Oligocene [details]