Borojevic, R.; Boury-Esnault, N.; Manuel, M.; Vacelet, J. (2002). Order Baerida Borojevic, Boury-Esnault & Vacelet, 2000. Pp. 1193-1200. In: Hooper, J.N.A.; Van Soest, R.W.M. (eds) (2002). Systema Porifera: a guide to the classification of sponges. Kluwer Academic/Plenum, NY, 1708 + xvliii. ISBN 0-306-47260-0 (printed version).
Baerida Borojevic et al. (Calcarea, Calcaronea) contains three families with a leuconoid aquiferous system without radial symmetry, characterized
by a skeleton either made exclusively of microdiactines or in which microdiactines constitute predominantly a specific sector of
the skeleton. As in Lithonida they are represented by well characterized and very distinctive genera, suggestive of long-term evolution.