| Nominal Species (n = 56) | Present allocation (n = 55) | Ref. |
|---|---|---|
| Kinorhynchus anomalus Lang, 1953 | Kinorhynchus anomalus | 19 |
| Kinorhynchus apotomus Higgins, 1983 | Kinorhynchus apotomus | 1409 |
| Pycnophyes arctous Adrianov, 1999 | Cristaphyes arctous | 3477 |
| Pycnophyes argentinensis Martorelli & Higgins, 2004 | Pycnophyes argentinensis | 1448 |
| Pycnophyes australensis Lemburg, 2002 | Pycnophyes australensis | 19 |
| Pycnophyes barentsi Adrianov, 1999 | Pycnophyes barentsi | 1448 |
| Pycnophyes beaufortensis Higgins, 1964 | Pycnophyes beaufortensis | 19 |
| Kinorhynchus belizensis Higgins, 1983 | Kinorhynchus belizensis | 1409 |
| Pycnophyes borealis Higgins & Korczinski, 1990 | Pycnophyes borealis | 19 |
| Pycnophyes calmani Southern, 1914 | Pycnophyes calmani | 19 |
| Pycnophyes canadensis Higgins & Korczinski, 1990 | Pycnophyes canadensis | 19 |
| Pycnophyes carinatus Zelinka, 1928 | Pycnophyes carinatus | 19 |
| Pycnophyes chilensis Lang, 1953 | Pycnophyes chilensis | 19 |
| Pycnophyes chukchiensis Higgins, 1991 | Pycnophyes chukchiensis | 19 |
| Pycnophyes communis Zelinka, 1908 | Pycnophyes communis | 19 |
| Pycnophyes corrugatus Higgins, 1983 | Pycnophyes corrugatus | 1409 |
| Pycnophyes cryopygus Higgins & Kristensen, 1988 | Pycnophyes cryopygus | 19 |
| Kinorhynchus deirophorus Higgins, 1983 | Kinorhynchus deirophorus | 1409 |
| Kinorhynchus distens Higgins, 1983 | Kinorhynchus distens | 19 |
| Pycnophyes ecphantor Higgins, 1983 | Pycnophyes ecphantor | 1409 |
| Pycnophyes egyptensis Higgins, 1983 | Pycnophyes egyptensis | 19 |
| Pycnophyes emarginatus Higgins, 1983 | Pycnophyes emarginatus | 1409 |
| Kinorhynchus erismatus Higgins, 1983 | Kinorhynchus erismatus | 1409 |
| Pycnophyes faveolus Brown, 1985 | Pycnophyes faveolus | 1448 |
| Kinorhynchus fimbriatus Higgins, 1982 | Kinorhynchus fimbriatus | 19 |
| Pycnophyes flaveolatus Zelinka, 1928 | Pycnophyes flaveolatus | 19 |
| Pycnophyes frequens Blake, 1930 | Pycnophyes frequens | 19 |
| Pycnophyes furugelmi Adrianov, 1999 | Pycnophyes furugelmi | 1448 |
| Pycnophyes galtsovae Adrianov, 1999 | Krakenella galtsovae | 3477 |
| Pycnophyes greenlandicus Higgins & Kristensen, 1988 | Pycnophyes greenlandicus | 19 |
| Pycnophyes iniorhaptus Higgins, 1983 | Pycnophyes iniorhaptus | 1409 |
| Pycnophyes kielensis Zelinka, 1928 | Pycnophyes kielensis | 19 |
| Pycnophyes longicornis Higgins, 1983 | Pycnophyes longicornis | 1409 |
| Trachydemus mainensis Blake, 1930 | Kinorhynchus mainensis | 1219 |
| Pycnophyes maximus Reimer, 1963 | Pycnophyes maximus | 19 |
| Pycnophyes mokievskii Adrianov, 1999 | Pycnophyes mokievskii | 1448 |
| Pycnophyes neuhausi Martorelli & Higgins, 2004 | Pycnophyes neuhausi | 1448 |
| Pycnophyes newguinensis Adrianov, 1999 | Pycnophyes newguinensis | 1448 |
| Pycnophyes newzealandiensis Adrianov, 1999 | Pycnophyes newzealandiensis | 1448 |
| Pycnophyes odhneri Lang, 1949 | Pycnophyes odhneri | 19 |
| Kinorhynchus paraneapolitanus Sheremetevskij, 1974 | Kinorhynchus paraneapolitanus | 19 |
| Pycnophyes parasanjuanensis Adrianov & Higgins, 1996 | Pycnophyes parasanjuanensis | 1448 |
| Kinorhynchus phyllotropis Brown & Higgins, 1983 | Kinorhynchus phyllotropis | 19 |
| Kinorhynchus rabaulensis Adrianov, 1999 | Kinorhynchus rabaulensis | 1448 |
| Pycnophyes robustus Zelinka, 1928 | Pycnophyes robustus | 19 |
| Pycnophyes rugosus Zelinka, 1928 | Pycnophyes rugosus | 19 |
| Pycnophyes sanjuanensis Higgins, 1961 | Pycnophyes sanjuanensis | 19 |
| Pycnophyes schornikovi Adrianov, 1995 | Pycnophyes schornikovi | 1448 |
| Pycnophyes sculptus Lang, 1949 | Pycnophyes sculptus | 19 |
| Pycnophyes spitsbergensis Adrianov, 1995 | Pycnophyes spitsbergensis | 3477 |
| Kinorhynchus stenopygus Higgins, 1983 | Kinorhynchus stenopygus | 1409 |
| Kinorhynchus trisetosus Higgins, 1983 | Kinorhynchus trisetosus | 19 |
| Pycnophyes tubuliferus Adrianov, 1989 | Pycnophyes tubuliferus | 19 |
| Kinorhynchus yushini Adrianov, 1989 | Kinorhynchus yushini | 19 |
| Pycnophyes zelinkae Southern, 1914 | Pycnophyes zelinkaei | 429 |
| Pycnophyes zelinkaei Southern, 1914 | Pycnophyes zelinkaei | 19 |