References

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Ostrovsky, AN, Dick, MH & Mawatari, SF (2007). The internal-brooding apparatus in the bryozoan genus Cauloramphus (Cheilostomata: Calloporidae) and its inferred homology to ovicells. Zoological Science 24: 1187 -1196.
Silén, L (1977). Polymorphism.183 - 231. In Woollacott, R.M. & Zimmer, R.L. (eds) Biology of Bryozoans. Academic Press, New York.