| 1208 | Higgins, R.P. 1960 A new species of Echinoderes (Kinorhyncha) from Puget Sound. Transactions of the American Microscopical Society 79(1):85-91. | 1960 | Pycnophyes frequens | 86 | 
				
			| 1228 | Wieser, W. 1960 Benthic Studies in Buzzards Bay. II. The Meiofauna. Limnology and Oceanography 5(2):121-137. | 1960 | Pycnophyes frequens | 127 | 
				
			| 1223 | Higgins, R.P. 1964 Redescription of the Kinorhynch Echinoderes remanei (Blake, 1930), Karling, 1954. Transactions of the American Microscopical Society 83(2):243-247. | 1964 | Pycnophyes frequens | 243 | 
				
			| 1209 | Higgins, R.P. 1965 The homalorhagid Kinorhyncha of Northeastern U. S. Coastal Waters. Transactions of the American Microscopical Society 84(1):65-72. | 1965 | Pycnophyes frequens | 66 | 
				
			| 1231 | Kozloff, E.N. 1972 Some aspects of development in Echinoderes (Kinorhyncha). Transactions of the American Microscopical Society 91(2):119-130. | 1972 | Pycnophyes frequens | 120 | 
				
			| 1219 | Higgins, R.P. 1982 Three new species of Kinorhyncha from Bermuda. Transactions of the American Microscopical Society 101(4):305-316. | 1982 | Pycnophyes frequens | 305 | 
				
			| 19 | Bisby, F.A., M.A. Ruggiero, K.L. Wilson, M. Cachuela-Palacio, S.W. Kimani, Y.R. Roskov, A. Soulier-Perkins and J. van Hertum 2005 Species 2000 & ITIS Catalogue of Life: 2005 Annual Checklist. CD-ROM; Species 2000: Reading, U.K. | 2005 | Pycnophyes frequens | --> | 
				
			| 1448 | Lemburg, C. 2006 Heimatseite von Christian Lemburg: Arten- und Autorenliste für die Priapulida, Loricifera und Kinorhyncha. http://wwwuser.gwdg.de/~clembur/welcome.htm#links and http://wwwuser.gwdg.de/~clembur/key.htm | 2006 | Pycnophyes frequens | --> |