World Register of Marine Species (WoRMS)
Caulophacus schulzei hyperboreus Koltun, 1967
de Voogd, N.J.; Alvarez, B.; Boury-Esnault, N.; Cárdenas, P.; Díaz, M.-C.; Dohrmann, M.; Downey, R.; Goodwin, C.; Hajdu, E.; Hooper, J.N.A.; Kelly, M.; Klautau, M.; Lim, S.C.; Manconi, R.; Morrow, C.; Pinheiro, U.; Pisera, A.B.; Ríos, P.; Schönberg, C.; Turner, T.; Vacelet, J.; van Soest, R.W.M.; Xavier, J. (2026). World Porifera Database. Caulophacus schulzei hyperboreus Koltun, 1967. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1651970 on 2026-08-31
Koltun, V.M. (1967). Glass, or Hexactinellid sponges of the Northern and Far-Eastern Seas of the USSR (Class Hyalospongiae). [In Russian]. Opredeliteli po faune SSR, izdavaemye Zoologicheskim muzeem Akademii nauk. 94: 1-124.