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Phylogenomics Revives Traditional Views on Deep Animal Relationships
The origin of many of the defining features of animal body plans, such as symmetry, nervous system, and the mesoderm, remains shrouded in mystery because of major uncertainty regarding the emergence… Expand
The Amphimedon queenslandica genome and the evolution of animal complexity
Sponges are an ancient group of animals that diverged from other metazoans over 600 million years ago. Here we present the draft genome sequence of Amphimedon queenslandica, a demosponge from the… Expand
The analysis of eight transcriptomes from all poriferan classes reveals surprising genetic complexity in sponges.
- A. Riesgo, N. Farrar, P. J. Windsor, G. Giribet, S. Leys
- Biology, Medicine
- Molecular biology and evolution
- 4 February 2014
Sponges (Porifera) are among the earliest evolving metazoans. Their filter-feeding body plan based on choanocyte chambers organized into a complex aquiferous system is so unique among metazoans that… Expand
The biology of glass sponges.
As the most ancient extant metazoans, glass sponges (Hexactinellida) have attracted recent attention in the areas of molecular evolution and the evolution of conduction systems but they are also… Expand
Developmental expression of transcription factor genes in a demosponge: insights into the origin of metazoan multicellularity
SUMMARY Demosponges are considered part of the most basal evolutionary lineage in the animal kingdom. Although the sponge body plan fundamentally differs from that of other metazoans, their… Expand
Cytological Basis of Photoresponsive Behavior in a Sponge Larva
Ontogenetic changes in the photoresponse of larvae from the demosponge Reneira sp. were studied by analyzing the swimming paths of individual larvae exposed to diffuse white light. Larvae swam upward… Expand
Impulse conduction in a sponge.
All-or-none propagated electrical impulses were recorded from the hexactinellid sponge Rhabdocalyptus dawsoni using suction electrodes attached to lumps of aggregated sponge tissue grafted onto the… Expand
Epithelia and integration in sponges.
- S. Leys, S. A. Nichols, Emily D M Adams
- Biology, Medicine
- Integrative and comparative biology
- 1 August 2009
An epithelium is important for integrity, homeostasis, communication and co-ordination, and its development must have been a fundamental step in the evolution of modern metazoan body plans. Sponges… Expand
The Sponge Pump: The Role of Current Induced Flow in the Design of the Sponge Body Plan
- S. Leys, G. Yahel, Matthew A. Reidenbach, V. Tunnicliffe, U. Shavit, H. Reiswig
- Chemistry, Medicine
- PloS one
- 13 December 2011
Sponges are suspension feeders that use flagellated collar-cells (choanocytes) to actively filter a volume of water equivalent to many times their body volume each hour. Flow through sponges is… Expand
Coordinated contractions effectively expel water from the aquiferous system of a freshwater sponge
SUMMARY In response to mechanical stimuli the freshwater sponge Ephydatia muelleri (Demospongiae, Haplosclerida, Spongillidae) carries out a series of peristaltic-like contractions that is effective… Expand