Argulus argulus Leach, 1814 accepted as Argulus foliaceus (Linnaeus, 1758) (source of synonymy)
Arpacticus chelifer Baird, 1850 accepted as Harpacticus chelifer (Müller O.F., 1776) (original description)
Caligus centrodonti Baird, 1850 (original description)
Canthocamptus furcatus Baird, 1850 accepted as Tisbe furcata (Baird, 1837) represented as Tisbe furcata furcata (Baird, 1837) (original description)
Carinocythereis antiquata antiquata (Baird, 1850) (original description)
Celtia quadridentata quadridentata (Baird, 1850) (original description)
Cyclops finmarchicus Müller O.F., 1776 accepted as Calanus finmarchicus (Gunnerus, 1770) (source of synonymy)
Cyclops geoffroyi Samouelle, 1819 accepted as Cyclops quadricornis (Linnaeus, 1758) represented as Cyclops quadricornis quadricornis (Linnaeus, 1758) (source of synonymy)
Cyclops inermis Tilesius, 1812 accepted as Canthocamptus minuticornis (Müller O.F., 1785) accepted as Ectinosoma melaniceps Boeck, 1865 (source of synonymy)
Cyclops minutus Claus, 1863 accepted as Metacyclops minutus (Claus, 1863) represented as Metacyclops minutus minutus (Claus, 1863) (source of synonymy)
Cyclops minutus Müller O.F., 1776 accepted as Canthocamptus minutus (Müller O.F., 1776) accepted as Bryocamptus (Bryocamptus) minutus (Claus, 1863) represented as Bryocamptus (Bryocamptus) minutus minutus (Claus, 1863) (source of synonymy)
Cypridina brenda Baird, 1850 accepted as Philomedes brenda (Baird, 1850) (original description)
Cypridinacea Baird, 1850 accepted as Cypridinoidea Baird, 1850 (original description)
Cytheracea Baird, 1850 accepted as Cytheroidea Baird, 1850 (original description)
Cythere acuta Baird, 1850 (original description)
Cythere antiquata antiquata (Baird, 1850) accepted as Carinocythereis antiquata antiquata (Baird, 1850) (original description)
Cythere convexa Baird, 1850 accepted as Aurila convexa (Baird, 1850) (original description)
Cythere convexa convexa Baird, 1850 accepted as Aurila convexa convexa (Baird, 1850) (original description)
Cythere impressa Baird, 1850 accepted as Loxoconcha rhomboidea (Fischer, 1855) (original description (unavailable nomenclaturally))
Cythere jonesii jonesii (Baird, 1850) accepted as Pterygocythereis jonesii jonesii (Baird, 1850) (original description)
Cythere minna Baird, 1850 accepted as Macrocypris minna (Baird, 1850) (original description)
Cythere pellucida Baird, 1850 accepted as Leptocythere pellucida (Baird, 1850) (original description)
Cythere pellucida pellucida Baird, 1850 accepted as Leptocythere pellucida pellucida (Baird, 1850) (original description)
Cythere quadridentata Baird, 1850 accepted as Celtia quadridentata (Baird, 1850) (original description)
Cythere quadridentata quadridentata Baird, 1850 accepted as Celtia quadridentata quadridentata (Baird, 1850) (original description)
Cythereis (Cythereis) Jones, 1849 (new combination reference)
Cythereis antiquata Baird, 1850 accepted as Carinocythereis antiquata (Baird, 1850) (original description)
Cythereis carinata antiquata (Baird, 1850) Ruggieri, 1952 accepted as Carinocythereis carinata antiquata (Baird, 1850) † (original description)
Cythereis convexa convexa (Baird, 1850) accepted as Aurila convexa convexa (Baird, 1850) (original description)
Cythereis jonesii Baird, 1850 accepted as Pterygocythereis jonesii (Baird, 1850) (original description)
Cythereis whiteii Baird, 1850 accepted as Carinocythereis whiteii (Baird, 1850) (original description)
Cytherocopina (original description)
Cytheroidea Baird, 1850 (original description)
Cytherura nigrescens (Baird, 1850) accepted as Semicytherura nigrescens (Baird, 1838) (original description)
Dactylopus stroemii Baird, 1850 accepted as Dactylopusia stroemii (Baird, 1850) (original description)
Lepeophtheirus obscurus Baird, 1850 accepted as Lepeophtheirus hippoglossi (Krøyer, 1837) (original description)
Lepeophtheirus thompsoni Baird, 1850 (original description)
Lernentoma lophii Baird, 1850 accepted as Chondracanthus lophii Johnston, 1836 (original description)
Mutilus convexus convexus (Baird, 1850) accepted as Aurila convexa convexa (Baird, 1850) (original description)
Pterygocythereis jonesii jonesii (Baird, 1850) (original description)
Temora Baird, 1850 (original description)
Temora finmarchica Baird, 1850 accepted as Temora longicornis (Müller O.F., 1785) (original description)