"The taxonomic structure of the genus Longipedia Claus, 1863 has undergone drastic changes since its creation to accommodate the type species L. coronata Claus, 1863, collected in Germany (Helgoland) and Italy (Naples), and poorly described by Claus in 1863 (for revisions see Lang, 1948: 152–155, and Wells, 1980). In his revision, Wells (1980) recognized 10 valid species within Longipedia, four species incertae sedis, and one species nomen dubium. Since then, two valid species (Longipedia andamanica nipponica Itô, 1985, and Longipedia spinulosa Itô, 1981), and one species incertae sedis (Longipedia sp. Fiers, 1984) have been added" (from Gomez, 2001). Recently Schizas et al. (2015) described a new taxon, L. gonzalezi from Puerto Rico, and in the same paper they discuss the phylogenetic position of the Polyarthra (a taxon consisting of the families Longipediidae and Canuellidae, whose affinities with Harpacticoida have been questioned)

Longipedia andamanica Wells, 1980

Longipedia andamanica nipponica Ito, 1985

Longipedia australica Nicholls, 1941

Longipedia corteziensis Gómez, 2001 *

Longipedia gonzalezi Schizas et al. 2022 ][Puerto Rico;mesophotic coral reefs]

Longipedia kikuchii Wells & Rao. 1987 [Andaman and Nicobar Islands]

Longipedia koreana Bang et al., 2021 [Korea]

Longipedia spinulosa Ito, 1981

Longipedia pontica Wells, 1980

Longipedia thailandensis Chullasorn et al., 2008 [Thailand; brackish waters]

Longipedia ulleungensis Bang et al., 2021 [Korea]

Longipedia weberi Lang, 1948

* helgolandica species-group, according to Gomez (2001)

KEY TO SPECIES

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LOURINIDAE Lang, 1948

LOURINIA Wilson C.B., 1924 (syn. Ceylonia Thompson I.C. & Scott A., 1903; Ceyloniella Wilson C.B., 1924;Jurinia Claus, 1866

Lourinia aculeata (Thompson I.C. & Scott A., 1903)

Lourinia nicobarica (Sewell, 1940) comb. nov.

Lourinia aldabraensis Karaytug et al., 2021

Lourinia armata (Nicholls, 1940)

Lourinia armata sulamericana Jakobi, 1954

Lourinia gocmeni Karaytug et al., 2021

Lourinia wellsi Karaytug et al., 2021

ARCHEOLOURINIA Gorgosinho & Schizas, 2012 (juinior synonym of Nannomesochra) (belonging to Canthocamptidae according to Karaytug et al., 2021)

Archeolourinia shermani Gorgosihno & Schizas, 2012 [Caribbean mesophotic zone]

Recently, "It has been determined that, according to updated modern keys, the recent inclusion of the monotypic genus Archeolourinia Corgosinho & Schizas, 2013 in the Louriniidae Monard, 1927 is not justified since Archeolourinia shermani Corgosinho & Schizas, 2013 does not belong to this family but must be assigned to the genus Nannomesochra within Canthocamptidae. Therefore, Archeolourinia was removed from the family Louriniidae and accepted as junior synonym of Nannomesochra keeping Nannomesochra shermani (Corgosinho & Schizas, 2013) comb. nov. as a valid species of the genus. " from Alper et al., 2023

METIDAE Lang, 1948

LAUBERIA Soyers, 1966

Laubieria tercera Fiers, 1992

METIS Sewell, 1940

(syn. Abacola Edwards, 1891,Carazzoides Grandori, 1912; Corazzoides Grandori, 1912 ; Ilyopsyllus Brady & Robertson, 1873 ; Parametis Labbé, 1927; Rubeus Carazzi & Grandori, 1912 Thoracosphaera Krichagin, 1873)

Metis coriacea (Brady & Robertson, 1873) syn. Metis ignea Philippi, 1843 ; Metis ignea ignea Philippi, 1843

Metis jousseaumei (Richard, 1892)

Metis reducta Fiers. 1992

Metis veneta (M. venetus in the original dscription) (Grandori, 1912)

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