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Marine Planktonic Copepods
Order
Cyclopoida Burmeister, 1834     (Classification and Phylogeny )
Syn.:  
Poecilostomatoida : Huys & Boxshall, 1991 (p.284); Vives & Shmeleva, 2010 (p.26)
Ref.:  
Huys & Boxshall, 1991 (p.192); Boxshall & Halsey, 2004 (p.1: Rem, p.38); Vives & Shmeleva, 2010 (p.26); Hirai & al., 2020 (p.1, Fig.4: metabarcoding, Fig.8: OTUs distribution patterns)
Ref.:  
For Boxshall & Halsey (2004, p.1) the discovery of a new family, the Fratiidae Ho & al, 1998, appears to bridge the gap between the two orders Cyclopoida and Poecilostomatoida, emerging concept of these two orders as a monophyletic group, and of the traditional Cyclopoida as a paraphyletic taxon.
12 pelagic families : Clausidiidae, Corycaeidae, Giselinidae, Lubbockiidae, Oithonidae, Oncaeidae, Paralubbockiidae, Sapphirinidae, Speleoithonidae, [Thaumatopsyllidae], Urocopiidae, incertae sedis (Cyclopoida).
The family Thaumatopsyllidae is transfered in the new order Thaumatopsylloida after Ho, Dojiri, Hendler & Deets (2003).

Family
Clausidiidae Embleton, 1901 ( Cyclopoida )
Family
Corycaeidae Dana, 1852 ( Cyclopoida )
Family
Cyclopettidae Martinez-Arbizu, 2000 ( Cyclopoida )
Family
Giselinidae Martinez Arbizu, 2000 ( Cyclopoida )
Family
Lubbockiidae Huys & Böttger-Schnack, 1996/97 ( Cyclopoida )
Family
Oithonidae Dana, 1853 ( Cyclopoida )
Family
Oncaeidae Giesbrecht, 1893 ["1892"] ( Cyclopoida )
Family
Paralubbockiidae Boxshall & Huys, 1988/89
Family
Sapphirinidae Thorell, 1859 ( Cyclopoida )
Family
Speleoithonidae Rocha & Iliffe, 1991 ( Cyclopoida )
Family
Thaumatopsyllidae Sars, 1913 ( Cyclopoida )
Family
Urocopiidae Humes & Stock, 1972 ( Cyclopoida )
Family
incertae sedis (Cyclopoida)