After Neuhaus, 2015 (WoRMS – World Register of Marine Species)

<==o Pycnophyes Zelinka, 1907 [Centrophyes; Hyalophyes]
   |-- P. arctous Adrianov, in Adrianov & Malakhov, 1999
   |-- P. argentinensis Martorelli & Higgins, 2004
   |-- P. aulacodes Sánchez, Pardos, Herranz & Benito, 2011
   |-- P. australensis Lemburg, 2002
   |-- P. barentsi Adrianov, in Adrianov & Malakhov, 1999
   |-- P. beaufortensis Higgins, 1964
   |-- P. borealis Higgins & Korczynski, 1989
   |-- P. canadensis Higgins & Korczynski, 1989
   |-- P. carinatus Zelinka, 1928
   |-- P. chilensis Lang, 1953
   |-- P. chukchiensis Higgins, 1991
   |-- P. communis Zelinka, 1908
   |-- P. corrugatus Higgins, 1983
   |-- P. cryopygus Higgins & Kristensen, 1988
   |-- P. dentatus (Reinhard, 1881) [Echinoderes dentatus Reinhard, 1881; Echinoderes dubius (Reinhard, 1887); Echinoderes pellucidus]
   |-- P. dolichurus Sánchez, Pardos, Herranz & Benito, 2011
   |-- P. ecphantor Higgins, 1983
   |-- P. egyptensis Higgins, 1966
   |-- P. emarginatus Higgins, 1983
   |-- P. faveolus Brown, in Adrianov & Malakhov, 1999
   |-- P. flaveolatus Zelinka, 1928
   |-- P. frequens Blake, 1930
   |-- P. furugelmi Adrianov, in Adrianov & Malakhov, 1999
   |-- P. galtsovae Adrianov, in Adrianov & Malakhov, 1999
   |-- P. greenlandicus Higgins & Kristensen, 1988
   |-- P. iniorhaptus Higgins, 1983
   |-- P. kielensis Zelinka, 1928 [Echinoderes pellucidus Reinhard, 1881]
   |-- P. longicornis Higgins, 1983
   |-- P. maximus Reimer, 1963
   |-- P. mokievskii Adrianov, 1995
   |-- P. neuhausi Martorelli & Higgins, 2004
   |-- P. newguiniensis Adrianov, in Adrianov & Malakhov, 1999
   |-- P. newzealandiensis Adrianov, in Adrianov & Malakhov, 1999
   |-- P. odhneri Lang, 1949
   |-- P. parasanjuanensis Adrianov & Higgins, 1996
   |-- P. ponticus (Reinhard, 1881) [Echinoderes ponticus Reinhard, 1881]
   |-- P. robustus Zelinka, 1928
   |-- P. rugosus Zelinka, 1928
   |-- P. sanjuanensis Higgins, 1961
   |-- P. schornikovi Adrianov, in Adrianov & Malakhov, 1999
   |-- P. sculptus Lang, 1949
   |-- P. spitsbergensis Adrianov, 1995
   |-- P. tubuliferus Adrianov, 1989
   `-- P. zelinkaei Southern, 1914

Pycnophyes incertae sedis:

    P. echinoderoides Zelinka, 1928 (taxon inquirendum)
    P. biserratus (Zelinka, 1928) (nomen dubium)
    P. conspicuus (Zelinka, 1928) (nomen dubium)
    P. curvatus (Zelinka, 1928) [Centroderes curvatus Zelinka, 1928] (nomen dubium)
    P. denticulatus (Zelinka, 1928) (nomen dubium)
    P. diffusus (Zelinka, 1928) (nomen dubium)
    P. longihastatus (Zelinka, 1928) (nomen dubium)
    P. longisetosus (Zelinka, 1928) (nomen dubium)
    P. moderatus (Zelinka, 1928) (nomen dubium)
    P. naviculus (Zelinka, 1928) (nomen dubium)
    P. rectilineatus (Zelinka, 1928) (nomen dubium)
    P. solidus (Zelinka, 1928) (nomen dubium)
    P. tenuis (Zelinka, 1928) (nomen dubium)
    P. validus (Zelinka, 1928) (nomen dubium)
    P. carinata Zelinka, 1912 (nomen nudum)

Reference(s):