Publications
Journal Articles
H Philippe, R Derelle, P Lopez, K Pick, C Borchiellini, N Boury-Esnault, J Vacelet, E Renard, E Houliston, E Queinnec, C Da Silva, P Winicker, H Le Guayader, S Leys, DJ Jackson, F Schreiber, D Erpenbeck, B Morgenstern and G Woerheide. "Phylogeomics revives traditional views on deep animal relationships." Current Biology 19 (2009): 706-712.SP Leys, SA Nichols and EDM Adams. "Epithelia and integration in sponges." Integrative and Comparative Biology 49 (2009): 167-177.
GJ Tompkins-MacDonald, WJ Gallin, O Sakaraya, B Degnan, SP Leys and LM Boland. "Expression of a poriferan potassium channel: Insights into the evolution of metazoan ion channels." Journal of Experimental Biology (Accepted for publication 2009).
SP Leys, C Larroux, M Gauthier, M Adamska, B Fahey, GS Richards, SM Degnan and BM Degnan. "Isolation of Amphimedon Developmental Material." Cold Spring Harbor Protocols (2008): Doi: 10.1101/pdb.prot5095.
BM Degnan, M Adamska, A Craigie, SM Degnan, B Fahey, M Gauthier , JNA Hooper, C Larroux, SP Leys, E Lovas and GS Richards. "The Demosponge Amphimedon queenslandica: Reconstructing the Ancestral Metazoan Genome and Deciphering the Origin of Animal Multicellularity." Cold Spring Harbor Protocols (2008): Doi: 10.1101/pdb.emo108.
GJ Tompkins-MacDonald and SP Leys. "Glass sponges arrest pumping in response to sediment: Implications for the physiology of the hexactinellid conduction system." Marine Biology 154 (2008): 973-954.
RD Rosengarten, EA Sperling, MM Moreno , SP Leys and SL Dellaporta. "The mitochondrial genome of the hexactinellid sponge Aphrocallistes vastus: Evidence for programmed translational frameshifting." BMC Genomics (2008): 9:33 doi:10.1186/1471-2164-9-33.
A Riesgo, C Taylor and SP Leys. "Reproduction in a carnivorous sponges: Implications of gametogenesis in the absence of an aquiferous system." Evolution and Development 9 (2007): 618-631 [NSERC].
GRD Elliott and SP Leys. "Coordinated behaviour in a freshwater sponge: Orchestrated contractions effectively expel water from the aquiferous system." Journal of Experimental Biology 210 (2007): 3736-3748.
SP Leys, GO Mackie and HM Reiswig. "The biology of glass sponges." Advances in Marine Biology 52 (2007): 1-145 [NSERC].
C Larroux, B Fahey, D Liubicich, VF Hinman, M Gauthier, M Gongora, K Green, G Wõrheide, SP Leys and BM Degnan. "Developmental expression of transcription factor genes in a demosponge: Insights into the origin of metazoan multicellularity." Evolution and Development 8 (2006): 150-173.
DI Eerkes-Medrano and SP Leys. "Ultrastructure and embryonic development of a syconoid calcareous sponge." Invertebrate Biology 125 (2006): 177-194.
SP Leys and RW Meech. "Physiology of coordination in sponges." Canadian Journal of Zoology 84 (2006): 288-306.
SP Leys and AV Ereskovsky. "Embryogenesis and larval differentiation in sponges." Canadian Journal of Zoology 84 (2006): 262-287.
SP Leys, EC Cheung and N Boury-Esnault. "Embyrogenesis in the glass sponge Oopsacas minuta: Formation of syncytia by fusion of blastomeres." Integrative and Comparative Biology 46 (2006): 104-117.
Leys, SP, and DI Eerkes-Medrano. "Feeding in a calcareous sponge: Particle uptake by pseudopodia." Biological Bulletin 211 (2006): 157-171.
SP Leys and D Eerkes-Medrano. "Gastrulation in calcareous sponges: In search of Haeckel's gastraea." Integrated Comparative Biology 45 (2005): 342-351.
BM Degnan, SP Leys and C Larroux. "Sponge development and antiquity of animal pattern formation." Integrated Comparative Biology 45 (2005): 335-341.
SP Leys, DS Rohksar and BM Degnan. "Quick Guide: Sponges." Current Biology 15 (2005): R114-R115.
SP Leys, K Wilson, C Holeton, HM Reiswig, WC Austin and V Tunnicliffe. "Patterns of glass sponge (Porifera, Hexactinellida) distribution in coastal waters of British Columbia, Canada." Marine Ecology Progress Series 283 (2004): 133-149.
SP Leys. "A comparative study of spiculogenesis in demosponge and hexactinellid larvae." Microscopy Research and Technique 62 (2003): 300-311.
SP Leys. "The significance of syncytial tissues for the position of the Hexactinellida in the Metazoa." Integrative and Comparative Biology 43 (2003): 19-27.
HC Schrõder, A Krasko, D Gundacker, SP Leys, IM Müller and WEG Müller. "Molecular and functional analysis of the (6-4) photolyase from the hexactinellid Aphrocallistes vastus." Biochimica Et Biophysica Acta 1651 (2003): 41-49.
D Jackson, SP Leys, VF Hinman, R Woods, MF Lavin and BM Degnan. "Environmental regulation of development: Induction of marine invertebrate metamorphosis." International Journal of Developmental Biology 46 (2002): 679-686.
SP Leys and BM Degnan. "Embryogenesis and metamorphosis in a haplosclerid demosponge: Gastrulation and transdifferentiation of larval ciliated cells to choanocytes." Invertebrate Biology 121 (2002): 171-189.
SP Leys, TW Cronin, BM Degnan and JN Marshall. "Spectral sensitivity in a sponge larva." Journal of Comparative Physiology - A 188 (2002): 199-202.
SP Leys and BM Degnan. "Cytological basis of photoresponsive behaviour in a sponge larva." Biological Bulletin 201 (2001): 323-338.
D Gundacker, SP Leys, HC Schrõder, IM Müller and WEG Müller. "Isolation and cloning of the C-type lectin from the hexactinellid sponge Aphrocallistes vastus: A putative aggregation factor." Glycobiology 11(1) (2001): 21-29.
SP Leys. "The choanosome of hexactinellid sponges." Invertebrate Biology 118 (1999): 221-235.
SP Leys, GO Mackie and RW Meech. "Impulse conduction in a sponge." Journal of Experimental Biology 202 (1999): 1139-1150.
SP Leys. "Introduction to Studies on Cell Adhesion Using Invertebrate Models." Microscopy Research and Technique 44 (1999): 201-203.
SP Leys and HM Reiswig. "Transport pathways in the neotropical sponge Aplysina." Biological Bulletin 195 (1998): 30-42.
SP Leys and RJN Lauzon. "The ecology of a deep sea sponge: Growth and seasonality in Rhabdocalyptus dawsoni." Journal of Experimental Marine Biology and Ecology 230 (1998): 111-129.
M Kruse, SP Leys, IM Müller and WEG Müller. "Phylogenetic position of the Hexactinellida within the phylum Porifera based on amino acid sequence of the protein kinase C from Rhabdocalyptus dawsoni." Journal of Molecular Evolution 46 (1998): 721-728.
WEG Müller, M Kruse, C Koziol and SP Leys. "Evolution of early Metazoa: phylogenetic status of the Hexactinellida within the phylum of Porifera [sponges]." Progress in Molecular and Subcellular Biology 21 (1998): 141-156.
SP Leys and GO Mackie. "Electrical recording from a glass sponge." Nature 387 (1997): 29-30.
C Koziol, SP Leys, WEG Müller and IM Müller. "Cloning of Hsp70 genes from the marine sponges Sycon raphanus (Calcarea) and Rhabdocalyptus dawsoni (Hexactinellida). An approach to solve the phylogeny of sponges." Biological Journal of the Linnean Society 62 (1997): 581-592.
SP Leys. "Sponge cell culture substrates: A comparative evaluation of their effects on adhesion." Tissue and Cell 29 (1997): 77-87.
RC Wyeth, SP Leys and GO Mackie. "Use of sandwich cultures for the study of feeding in the hexactinellid sponge Rhabdocalyptus dawsoni (Lambe, 1892)." Acta Zoologica 77 (1996): 227-232.
SP Leys. "Cytoskeletal architecture and organelle transport in giant syncytia formed by fusion of hexactinellid sponge tissues." Biological Bulletin 188 (1995): 241-254.
Book Chapters
GRD Elliott, TA Macdonald and SP Leys. "Sponge larval phototaxis: A comparative study." In Sponge Science in the New Millennium68, Editors M Pansini, R Pronzato, G Bavestrello and R Manconi. Bollettino dei Musei e degli Istituti Biologici dell'Università di Genova (2004): 291-300.SP Leys and HM Reiswig. “Hexactinellida.” In Grzimek’s Animal Life Encyclopedia, 2nd Edition.Volume 2, Lower Metazoans and Deuterostomes, Editors M Hutchins, D Thoney and N Schlager. Farmington Hills, MI: Gale Group (2004): 67-76.
SP Leys. "Gastrulation in sponges." In Gastrulation, Editor C Stern. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, New York (2004): 23-31.
Conference Proceedings
SP Leys. "Sponge coordination, tissues, and the evolution of gastrulation. Porifera Research: Biodiversity, Innovation and Sustainability." In Proceedings of the 7th International Porifera Congress, Editors MR Custidio, G Lobo-Hadju, E Hadju and G Muiricy, 53-59. Buzios, Brazil. 2007 [NSERC].BM Degnan, C Larroux, SP Leys, D Liubicich, VF Hinman, M Gongora, M Elliott and G Woerheide. "Expression of developmental genes in sponge larvae: Evidence for a shared regulartory architechture in all metazoans." In Proceedings of the Bolletino dei Musei e delgli Istituti Biologici dell'Universita di Genova, 66-67. Genova, Italy. 2002.
SP Leys. "Fusion and cytoplasmic streaming are characteristic of at least two hexactinellid sponges. An examination of live tissue cultures from Aphrocallistes vastus Sponge Sciences." In Proceedings of International Conference on Sponge Science, 215-226. Lake Biwa Research Institute, Japan. 1998.
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