Acanthocaris livingstoneana – synonym of Gastrosaccus spinifer
Acanthomysis platydens – synonym of Acanthomysis longicornis
Acanthomysis spinosissima – synonym of Acanthomysis longicornis
Acanthosepion enoplonÊ – synonym of Sepia orbignyana
Acheles arachnipodus – synonym of Sergestes arcticus
Actinitrocha brownei – synonym of Actinotrocha branchiata
Actinonotrocha metschnikoffii – synonym of Actinotrocha sabatieri
Actinotrocha ashworthi – synonym of Actinotrocha sabatieri
Actinotrocha B – synonym of Actinotrocha branchiata
Actinotrocha hatscheki – synonym of Actinotrocha sabatieri
Actinotrocha wilsoni A – synonym of Actinotrocha sabatieri
Aegineta corona – synonym of Solmaris corona
Agalma clavata – synonym of Agalma elegans
Agalma elegans – synonym of Agalma elegans
Agalma punctata – synonym of Apolemia uvaria
Agalma sarsii – synonym of Agalma elegans
Agalmopsis elegans – synonym of Agalma elegans
Agalmopsis elegans – synonym of Nanomia cara
Agalmopsis sarsi – synonym of Agalma elegans
Agastra mira – synonym of Orthopyxis integra
Agastra mira | Hartlaub, 1897 – synonym of Orthopyxis integra
Aglantha rosa – synonym of Aglantha digitale
Alauna rostrata – synonym of Diastylis laevis
Alauretta viridirostrum – synonym of Alaurina composita
Alaurina claparedii – synonym of Alaurina composita
Alloposus mollis – synonym of Haliphron atlanticus
Allorossia glaucopis – synonym of Rossia palpebrosa
Alloteuthis media – synonym of Alloteuthis medius
Alloteuthis subulata – synonym of Alloteuthis subulatus
Alphaeus pelagicus – synonym of Acanthephyra pelagica
Alphaeus polaris – synonym of Lebbeus polaris
Alphaeus sivado – synonym of Pasiphaea sivado
Ametrangia hemisphaerica – synonym of Dipleurosoma typicum
Amphicodon amphipleurus – synonym of Hybocodon prolifer
Amphinema titania – synonym of Amphinema rugosum
Amphioxus lanceolatus – synonym of Branchiostoma lanceolatum
Anceus abyssorum – synonym of Gnathia abyssorum
Anceus brivatensis – synonym of Paragnathia formica
Anceus dentatus – synonym of Gnathia dentata
Anceus formica – synonym of Paragnathia formica
Anceus halidaii – synonym of Paragnathia formica
Anceus maxillaris – synonym of Gnathia oxyuraea
Anceus oxyuraeus – synonym of Gnathia oxyuraea
Anceus rapax – synonym of Gnathia vorax
Anceus vorax – synonym of Gnathia vorax
Anchialina mediterranea – synonym of Anchialina agilis
Appendicularia flabellum – synonym of Oikopleura dioica
Arachnactis bournei – synonym of Cerianthus lloydii
Arachnactis lloydii – synonym of Cerianthus lloydii
Architeuthis clarkei – synonym of Architeuthis dux
Architeuthis harveyi – synonym of Architeuthis dux
Architeuthis monachus – synonym of Architeuthis dux
Astacus elephas – synonym of Palinurus elephas
Astacus harengum – synonym of Praunus flexuosus
Astacus marinus – synonym of Homarus gammarus
Asterias imperati – synonym of Luidia ciliaris
Astrella simplex – synonym of Luidia sarsi
Atlanta lesueurii – synonym of Limacina lesueuri
Auliscus pulcher – synonym of Hybocodon prolifer
Austromysis arenosa – synonym of Paramysis arenosa
Austromysis helleri – synonym of Paramysis helleri