Recently, in the course of a general review of the Thalestridimorpha Lang, 1948, Willen (1999, 2000) raised the Pseudotachiidae Lang, 1936 to family rank, removing it from the family Thalestridae Sars, 1905 to which they had been previously assigned as a subfamily.

In the same occasion the author subdivided the family into four subfamilies, viz. Paranannopinae, Pseudomesochrinae, Donsiellinae and Pseudotachidiinae, as well as reunited the families Ambunguipedidae Huys, 1990 and Hamondiidae Huys, 1990 with the family Rhynchothalestridae.

"The Pseudotachidiidae are a quite large and successful taxon within the Harpacticoida concerning number of species and subtaxa as well as a worldwide distribution range. Many species are known from the deep sea.

Several monophyletic subgroups have already been identified (Hicks 1988, Willen 1996, 1999, 2000), as there are the Paranannopinae Por, 1986, Pseudomesochrinae Willen 1996, Donsiellinae Lang, 1944, Pseudotachidius T. Scott, 1898 (compare Hicks 1988; Willen 1996, 1999; Veit-Kohler and Willen 1999). Idomene Phillipi, 1843 and Dactylopodella Sars, 1905 are not yet or only partly revised (Hicks 1989; Willen 1999)." (Willen, 2005).

Afrosenia Huys & Gee, 1996

Anapophysia Huys & Gee, 1996

Archisenia Huys & Gee, 1993

Bathypsammis Huys & Gee, 1993

Carolinicola Huys & Thistle, 1989 [PDF]

Cylindronannopus Coull, 1973

Danielssenia Boeck, 1872

Fladenia Gee & Huys, 1990

Jonesiella Brady, 1880 [syn. Sentirenia Huys & Gee, 1992]

Leptotachidia Becker, 1974

Micropsammis Mielke, 1974

Mucrosenia Huys & Gee, 1994

Paradanielssenia Huys et al., 1996

Paranannopus Lang, 1936 [PDF]

Peltisenia Huys & Gee, 1996

Prionos Huys & Gee, 1996

Psammis Sars, 1910

Sentiropsis Huys & Gee, 1996

Telopsammis Gee & Huys, 1991

AFROSENIA Huys & Gee, 1996

Afrosenia spinipes (Wells, 1967)

CYLINDRONANNOPUS Coull, 1973

Cylindronannopus bispinosus Schriever, 1985

Cylindronannopus elongatus (Becker, 1972)

Cylindronannopus primus Coull, 1973

LEPTOTACHIDIA Becker, 1974

Leptotachidia iberica Becker, 1974

SENTIROPSIS Huys & Gee, 1996

Sentiropsis minuta (Coull, 1969)

FLADENIA Gee & Huys, 1990

Fladenia robusta Huys etal., 1996

JONESIELLA Huys etal., 1996

Jonesiella fusiformis Huys etal., 1996

Jonesiella eastwardae (Coull, 1971)

CAROLINICOLA Huys & Thistle, 1989

Carolinicola trisetosa (Coull, 1973)

Carolinicola galapagoensis Mielke , 1997

MICROPSAMMIS Mielke, 1964

Micropsammis galapagoensis Mielke, 1997

Micropsammis noodti Huys et al., 1996

Micropsammis secunda (Huys et al .,1996)

MUCROSENIA Huys & Gee, 1994

Mucrosenia kendalli Gee & Huys, 1994

PARADANIELSSENIA Soyer, 1970

Paradanielssenia biclavata Huys et al., 1996

Paradanielssenia christineae Gee & Huys, 1994

Paradanielssenia kathleenae Gee & Huys, 1994

Paradanielssenia kunzi Soyer, 1970

SUBFAMILY PSEUDOMESOCHRINAE Willen, 1996

PSEUDOMESOCHRA T. Scott, 1902

According to Willen (1996) the genus Pseudomesochra presently includes 18 species, but more can presumably be expected to be still now unknown.

Pseudomesochra aberrans Bodin, 1968

Pseudomesochra abyssalis Becker & Schriever, 1979

Pseudomesochra beckeri Becker & Schriever, 1979

Pseudomesochra brucei T. & A. Scott, 1901 [Hoffnung Island; marine]

Pseudomesochra crispata Brady, 1910

Pseudomesochra divaricata Sars, 1906 [north Europe; marine]

Pseudomesochra gemina Coull, 1973

Pseudomesochra gertwilleni Willen, 1996 [Weddell Sea]

Pseudomesochra laptevensis Willen, 1996 [Laptev Sea]

Pseudomesochra latifurca Sars, 1911 [Norway; marine]

Pseudomesochra longifurcata T. Scott, 1902

Pseudomesochra media Sars, 1911 [north Europe; marine]

Pseudomesochra meridianensis Willen, 1996 [Weddell Sea]

Pseudomesochra minor Becker, 1974

Pseudomesochra perplexa Bodin, 1968

Pseudomesochra schheibeli Schriever, 1982

Pseudomesochra similis Lang, 1936 [Sweden; marine]

Pseudomesochra tamara Smirnov, 1946

Pseudomesochra tatianae Drzycimski, 1968

SUBFAMILY DONSIELLINAE Lang, 1944 [under construction]

Apodonsiella Hicks, 1988
Donsiella Stephensen, 1936
Oligoxilora Hicks, 1988
Pseudonsiella Hicks, 1988
Xilora Hicks, 1988

DONSIELLA Stephensen, 1936

Donsiella anglica Hicks, 1988

Donsiella bisetosa Hicks, 1988

Donsiella limnoriae Stephensen, 1936

Donsiella phycolimnoriae Hicks, 1990

Donsiella victoriae Hicks, 1988

PEUDONSIELLA Hicks, 1988

Pseudonsiella aotearoa Hicks, 1988

XILORA Hicks, 1988

Xylora bathyalis Hicks, 1988

SUBFAMILY PSEUDOTACHIDIINAE Lang, 1936 [under construction]

Dactylopodella Sars, 1905
Idomene Philippi, 1843
Pseudotachidius T. Scott, 1898

PSEUDOTACHIDIUS T. Scott, 1898

Pseudotachidius abyssalis Becker 1974,

Pseudotachidius bipartitus Montagna, 1980

Pseudotachidius bipartitus pacificus Itô, 1983

Pseudotachidius brevisetosus Montagna, 1980

Pseudotachidius coronatus Scott, 1898

Pseudotachidius horikoshii Itô, 1983

Pseudotachidius ibericus Becker & Schriever, 1979

Pseudotachidius minimus Lang, 1948

Pseudotachidius minutus Itô, 1983

Pseudotachidius peruanus Becker, 1979

Pseudotachidius similis Lang, 1948

Pseudotachidius vikingus Drzycimski, 1968

DACTYLOPODELLA Sars, 1905

Dactylopodella clypeata Moore ,1976

Dactylopodella flava Sars , 1910

Dactylopodella incerta Vervoort, 1964

Dactylopodella janetae Hicks, 1989

Dactylopodella rostrata Lang, 1948

IDOMENE Philippi, 1843

Idomene aemula Lang, 1948

Idomene antarcticus (Giesbrecht, 1902)

Idomene borealis Lang, 1948

Idomene cookensi Pallares, 1975

Idomene ferrieri Lang, 1948

Idomene intermedia Lang, 1934

Idomene kabylica Lang, 1948

Idomene laticaudata Lang, 1948

Idomene maldiviae Wells & Rao, 1987

Idomene novae-zealandiae Lang, 1948

Idomene parasimulans Médioni & Soyer, 1967

Idomene pectinata Lang, 1948

Idomene purpurocincta Lang, 1965

Idomene pusilla Lang, 1948

Idomene scotti (Scott ,1912)

Idomene simulans Lang, 1948

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DACTYLOPUSIIDAE Lang, 1936 [under construction]

Dactylopodoipsis Sars, 1911
Dactylopusia Norman, 1903
Dactylopusioides Brian, 1928
Diarthrodes Thomson, 1882
Paradactylopodia Lang, 1944
Sewellia Lang, 1965

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