1. Adamska M, Degnan SM, Green KM, Adamski M, Craigie A, Larroux C, Degnan BM (2007) Wnt and TGF-b expression in the sponge Amphimedon queenslandica and the Origin of Metazoan Embryonic Patterning. PLoS ONE 2(10 e1031): doi: 10.1371/journal.pone.0001031
2. Adell T, Nefkens I, Müller WEG (2003) Polarity factor ‘frizzled’ in the demosponge Suberites domuncula: identification, expression and localization of the receptor in the epithelium/pinacoderm. FEBS Lett 554:363–368
3. Adell T, Müller WEG (2004) Cloning and characterization of T-box and forkhead transcription factors from Porifera. Boll Mus Ist Biol Univ Genova 68:163–173
4. Afzelius B (1979) Sperm structure in relation to phylogeny in lower metazoa. In: Fawcett DW, Bedford JM (eds) The spermatozoon. Urban & Schwarzenberg Inc, Baltimore-Munich
5. Amano S, Hori I (1992) Metamorphosis of calcareous sponges. I. Ultrastructure of free-swimming larvae. Invert Rep Dev 21:81–90