For Reprints, email: sleys@ualberta.ca

· Leys, S.P. and Meech, R.W. 2006. Physiology of coordination in sponges. Can. J. Zool. 84(2): 288-306.

· Leys, S.P. and Ereskovsky, A.V. 2006. Embryogenesis and larval differentiation in sponges. Can. J. Zool. 84(2): 262-287.

· Larroux, C., Fahey, B., Liubicich, D., Hinman, V.F., Gauthier, M., Gongora, M., Wörheide, G., Leys, S.P., Degnan, B.M. 2006. Developmental expression of transcription factor genes in a demosponge: insights into the origin of metazoan multicellularity. Evol. & Dev. 8(2): 50-173.

· Leys, S.P., Cheung, E.C., Boury-Esnault, N. 2006. Embyrogenesis in the glass sponge Oopsacas minuta: formation of syncytia by fusion of blastomeres. Integr. Comp. Biol. 46(2): 104-117.

· Leys, S.P. and Eerkes-Medrano, D. 2005. Gastrulation in calcareous sponges: in search of Haeckel’s gastraea. Integr. Comp. Biol. 45(2): 342-351.

· Leys, S.P., Rohksar, D.S. and Degnan, B.M. 2005. Quick Guide: Sponges. Curr. Biol. 15:R114-R115.

· Degnan, B.M., Leys, S.P. and Larroux, C. 2005. Sponge development and antiquity of animal pattern formation. Integr. Comp. Biol. 45 (2): 335-341.

· Leys, S.P., Wilson, K., Holeton, C., Reiswig, H.M., Austin, B., and Tunnicliffe, V. 2004.

Patterns of glass sponge (Porifera, Hexactinellida) distribution in coastal waters of British Columbia, Canada. Mar. Ecol. Progr. Ser. 283:133-149.

· Elliott G.R.D., Macdonald T.A. and S.P. Leys. 2004.

Sponge larval phototaxis: a comparative study. M. Pansini, R. Pronzato, G. Bavestrello and R. Manconi (Eds.), Sponge Science in the New Millennium, Boll. Mus. Ist. Biol. Univ. Genova, 68:291-300

· Leys S.P. 2004.

Gastrulation in sponges. In Gastrulation (ed. C. Stern). Cold Spring Harbor Laboratory Press, Cold Spring Harbor, New York. Pp. 23-31.

· Leys, S.P. and H.M. Reiswig 2004. Hexactinellida. In: Grzimek’s Animal Life Encyclopedia, 2^nd Edition.Volume 2, Lower Metazoans and Deuterostomes, edited by Michael Hutchins, Dennis Thoney, and Neil Schlager. Farmington Hills, MI: Gale Group. Pp. 67-76.

· Schröder, H.C., Krasko, A., Gundacker, D., Leys, S.P., Müller, I.M., and Müller, W.E.G., 2003. Molecular and functional analysis of the (6-4) photolyase from the hexactinellid Aphrocallistes vastus. Biochim. Biophys. Acta 1651(1-2):41-49.

· Leys, S.P. 2003.

A comparative study of spiculogenesis in demosponge and hexactinellid larvae. Micros. Res. Tech. 62:300-311.

· Leys, S.P. 2003.

The significance of syncytial tissues for the position of the Hexactinellida in the Metazoa. Integr. Comp. Biol. 43:19-27.

· Jackson, D., Leys, S.P., Hinman, V.F., Woods, R., Lavin, M.F. and B. M. Degnan. 2002.

Environmental regulation of development: induction of marine invertebrate metamorphosis. Int. J. Dev. Biol. 46:679-686.

· Leys, S.P., and B.M. Degnan 2002.

Embryogenesis and metamorphosis in a haplosclerid demosponge: gastrulation and transdifferentiation of larval ciliated cells to choanocytes. Invert. Biol. 121:171-189.

· Leys, S.P., Cronin, T.W., Degnan, B.M. and J.M. Marshall. 2002.

Spectral sensitivity in a sponge larva. J. Comp. Physiol.- A. 188:199-202

· Leys, S.P. and B.M. Degnan, 2001.

The cytological basis of photoresponsive behaviour in a sponge larva. Biol. Bull. 201:323-338.

· Gundacker, D., Leys, S.P., Schröder, H.C., Müller, I.M. and W.E.G. Müller, 2001.

Isolation and cloning of the C-type lectin from the hexactinellid sponge Aphrocallistes vastus: A species-unspecific aggregation factor. Glycobiology 11(1):21-29.

· Leys, S.P. 1999.

The choanosome of hexactinellid sponges. Invert. Biol. 118:221-235.

· Leys, S.P., Mackie, G.O. and R.W. Meech, 1999.

Impulse conduction in a sponge. J. Exp. Biol. 202: 1139-1150.

· Leys, S.P. and H.M. Reiswig, 1998.

Nutrient transport pathways in the neotropical sponge Aplysina. Biol. Bull. 195:30-42.

· Leys, S.P. and R.J.N. Lauzon, 1998.

The ecology of a deep sea sponge: growth and seasonality in Rhabdocalyptus dawsoni. J. Exp. Mar. Biol. Ecol. 230:111-129.

· Kruse, M., Leys, S.P., Müller I.M., W.E.G. Müller, 1998.

Phylogenetic position of the Hexactinellida within the phylum Porifera based on amino acid sequence of the protein kinase C from Rhabdocalyptus dawsoni. J. Mol. Evol. 46:721-728.

· Müller, W.E.G, Kruse, M., Koziol, C., and S.P. Leys, 1998.

Evolution of early Metazoa: phylogenetic status of the Hexactinellida within the phylum of Porifera [sponges]. Progr. Molec. Subcell. Biol. 21:141-156.

· Leys, S.P. and G.O. Mackie, 1997.

Electrical recording from a glass sponge. Nature 387:29-30.

· Koziol, C., Leys, S.P., Müller, W.E.G. I.M, Müller, 1997.

Cloning of Hsp70 genes from the marine sponges Sycon raphanus (Calcarea) and Rhabdocalyptus dawsoni (Hexactinellida). An approach to solve the phylogeny of sponges. Biol. J. Linnean Soc. 62:581-592.

· Leys, S.P., 1997.

Sponge cell culture substrates: a comparative evaluation of their effects on adhesion. Tissue and Cell 29:77-87.

· Wyeth, R.C., Leys, S.P. and G.O. Mackie 1996.

Use of sandwich cultures for the study of feeding in the hexactinellid sponge Rhabdocalyptus dawsoni (Lambe, 1892). Acta Zoologica 77(3):227-232.

· Leys, S.P. 1995.

Cytoskeletal architecture and organelle transport in giant syncytia formed by fusion of hexactinellid sponge tissues. Biol. Bull. 188:241-254.