Martinez Arbizu & Moura (1994) considered the Cylindropsillidae as polyphyletic and desolved it incorporating the Cylindropsyllinae in the family Canthocamptidae as well as raising to family level the subfamily Leptopontiinae.

More recently Recently Huys & Conroy-Dalton (2006) described 3 new species of the genus Evansula, including them in the re-established family Cylindropsillidae: Evansula cumbaensis Huys & Conroy-Dalton, 2006; Evansula polaris Huys & Conroy-Dalton, 2006; Evansula spinosa Huys & Conroy-Dalton, 2006.

"Pending a full-blown phylogenetic analysis of the canthocamptoid complex and the arrival of molecular sequence data, the Cylindropsyllidae could be considered as a valid family comprising the following genera: Cylindropsyllus Brady, 1880; Evansula T. Scott, 1906b; Stenocaris Sars, 1909; Cylinula Coull, 1971; Boreopontia Willems, 1981; Stenocaropsis Apostolov, 1982; Willemsia Huys & Conroy-Dalton, 1993; Navalonia Huys & Conroy-Dalton, 1993; and Selenopsyllus Moura & Pottek, 1998. Of these, the genus Cylindropsyllus is possibly paraphyletic and Stenocaris undoubtedly polyphyletic. (R. Huys & S. Conroy- Dalton, unpubl. data)".

"The family Cylindropsyllidae Sars, 1909, currently comprising 39 species in 13 genera, is a representative of mesopsammic harpacticoids (Richter, 2019). Members of this family have an interstitial lifestyle and exhibit the above morphological trends except for miniaturization, and a cylindrical or vermiform habitus without a distinct constriction between the prosome and urosome, and slender swimming legs with reduced segmentation and setal armature (Huys & Conroy-Dalton, 2006a; Richter, 2019)" (from Kim et al., 2023)

KEY TO GENERA OF CYLINDROPSILLIDAE

MONSMETEORIS Richter, 2019

Monsmeteoris wieshuorum Richter, 2019 [East Atlantic]

Monsmeteoris reductus Richter, 2019 [East Atlantic]

EVANSULA T. Scott, 1906
Evansia Scott T., 1906 (synonym)

Evansula arenicola Nicholls, 1940 [St. Lawrence, psammon]

Evansula belomorensis Kornev & Chertoprud, 2008

Evansula incerta (T. Scott, 1892) [Europe, USA; mesopsammon]

Evansula pygmaea (T. Scott, 1903) [north Europe; marine psammon]

Evansula cumbraensis Huys & Conroy-Dalton, 2006 [N-West Europe; marine]

Evansula polaris Huys & Conroy-Dalton, 2006 [N-West Europe; marine]

Evansula spinosa Huys & Conroy-Dalton, 2006 [N-West Europe; marine]

CYLINDROPSYLLUS Brady, 1880

Cylindrosoma Brady, 1878 (synonym)

Cylindropsyllus brevicornis Douwe, 1904 (syn. Leptocaris brevicornis (Douwe, 1904) (syn, Leptocaris brevicornis (Douwe, 1904)

Cylindropsyllus fairliensis Scott T., 1899 [syn. Darcythompsonia fairliensis (Scott T., 1899)] (syn. Darcythompsonia fairliensis (Scott T., 1899)

Cylindropsyllus flexibilis Richter, 2019 [East Atlantic]

Cylindropsyllus govaerei Huys & Willems, 1993 [Corsica; marine sand]

Cylindropsyllus ibericus Huys & Willems, 1993 [Portugal; marine sand]

Cylindropsyllus kunzi Huys, 1988 [Netherlands; marine interstitial]

Cylindropsyllus laevis Brady, 1880 [Europe; marine interstitial]

Cylindropsyllus minor Scott T., 1893 [syn. Stenocaris minor (Scott T., 1893)] (syn. Stenocaris minor (Scott T., 1893)

Cylindropsyllus remanei Kunz, 1949 [Ireland, Helgoland; marine interstitial]

Cylindropsyllus valentini Richter, 2019 [East Atlantic]

Key to the species of Cylindropsyllus

CYLINULA Coull, 1971

Cylinula arganoi Cottarelli & Venanzetti, 1989 [Italy, Sardinia; marine interstitial]

Cylinula proxima Coull, 1971 [USA; meiobenthos]

NAVALONIA Huys & Conroy-Dalton, 1993

Navalonia kerguelenensis Huys & Conroy-Dalton, 1993 [Kerguelen; marine sand]

STENOCARIS Sars, 1909

Stenocaris abyssalis Becker, Noodt & Schriever, 1979 (syn. Stenocaropsis abyssalis (Becker, Noodt & Schriever)

Stenocaris figaroloensis Kim et al., 2023 [East Sea]

Stenocaris gracilis Sars, 1909

Stenocaris intermedia Ito, 1972 [Japan;East Sea of Korea and Russia; marine interstitial]

Stenocaris kerguelenensis Bodiou, 1977 (syn. Navalonia kerguelenensis (Bodiou, 1977) (syn. Navalonia kerguelenensis (Bodiou, 1977)

Stenocaris marcida Kim et al., 2023 [East Sea]

Stenocaris minor (T. Scott, 1892) [Europe; marine sand] species inquirenda

Stenocaris minor sensu Wilson, 1932 species inquirenda

Stenocaris minor sensu Apostolov, 1971 species inquirenda

Stenocaris minor sensu Marinov, 1971 species inquirenda

Stenocaris minor sensu Apostolov & Marinov, 1988 species inquirenda

Stenocaris minor sensu Cottarelli & Venanzetti, 1989 (syn. Stenocaris figaroloensis) Kim et al., 2023 [East Sea]

Stenocaris minuta Nicholls, 1935 [Europe; marine sand] (syn. Vermicaris minuta (Nicholls, 1935)

Stenocaris pontica Chappuis & Serban, 1953 [Europe; phreatic waters] (syn. Vermicaris pontica (Chappuis & Serban, 1953)

Stenocaris pristina Wells, 1968 (syn. Stenocaropsis pristina (Wells, 1968)

Stenocaris profundus Becker, Noodt & Schriever, 1979 (syn. Stenocaropsis profundus (Becker, Noodt & Schriever, 1979; Selenopsyllus profundus (Becker, Noodt & Schriever, 1979)

Stenocaris valkanovi Marinov,1972 [Black Sea] (syn. Stenocaropsis valkanovi (Marinov, 1974))

KEY TO SPECIES OF STENOCARIS

STENOCAROPSIS Apostolov, 1982

Stenocaropsis abyssalis (Becker, Noodt & Schriever, 1979) Comb. nov. (Kunz, 1994a) for Stenocaris abyssalis Becker, Noodt & Schriever, 1979

Stenocaropsis pristina (Wells, 1968) [Scilly island; marine interstitial]

Stenocaropsis profundus (Becker, Noodt & Schriever, 1979) Comb. nov. (Kunz, 1994a) for Stenocaris profundus Becker, Noodt & Schriever, 1979

Stenocaropsis similis Cottarelli & Venanzetti, 1989 [Italy, Sardinia; marine interstitial]

Stenocaropsis valkanovi (Marinov, 1974) [Black sea] Comb. nov. (Apostolov, 1982) for Stenocaris valkanovi Marinov, 1974c. After Kunz (1994a), this species probably is a synonym of S. similis.

SELENOPSYLLUS Moura & Pottek, 1998

Selenopsyllus abyssalis (Becker, 1979) [Europe, abyssal interstitial] (=Wellsopsyllus (Wellsopsyllus) abyssalis (Becker, Noodt & Schriever, 1979)

Selenopsyllus antarcticus Moura & Pottek, 1998 [Antarctic Sea]

Selenopsyllus dahmsi Moura & Pottek, 1998 [Antarctic Sea]

Selenopsyllus profundus (Becker, 1979) [Europe, abyssal interstitial]

BOREOPONTIA Willems, 1981

Boreopontia heipi Willems, 1981 [North Sea, interstitial]

WILLEMSIA Huys & Conroy-Dalton, 1993

Willemsia calceola Huys & Conroy-Dalton, 1993 [north Europe; shallow coastal areas]

BOREOVERMIS Huys & Conroy-Dalton, 2006

Boreovermis bilobata Huys & Conroy-Dalton, 2006 [North Sea]

BOLBOTELSON Huys & Conroy-Dalton, 2006

Bolbotelson longisetosus Huys & Conroy-Dalton, 2006 [North Sea]

VERMICARIS Kornev & Chertoprud, 2008

Vermicaris baltica (Arlt, 1983) [Baltic sea] comb. nov, [This species possibly is a synonym of St. minuta, after Kunz (1994a)

Vermicaris minuta (Nicholls, 1935)

Verimicaris pygmaea (Noodt, 1955) comb. nov. [France; marine sand]

Vermicaris pontica (Chappuis & Serban, 1953)

HUYSICARIS Kim et al. 2023

Huysicaris arenicola (Wilson, 1932) comb. nov.

Huysicaris kliei (Kunz, 1938) comb. nov.

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