2024-03-29T01:23:42Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1570142021-05-18T12:27:42Zcom_10261_9676com_10261_8col_10261_9679
DIGITAL.CSIC
author
Torruella, Guifré
author
Mallo, Diego
author
Pérez-Porro, Alicia R.
author
Leys, Sally P.
author
Ruiz-Trillo, Iñaki
author
Giribet, Gonzalo
author
Riesgo Gil, Ana
2017-11-06T10:52:02Z
2017-11-06T10:52:02Z
2013-11
Ninth World Sponge Conference (2013)
http://hdl.handle.net/10261/157014
With the recent focus on the monophyly of sponges, the internal relationships between
the four classes of sponges have attracted less attention. For the last two decades
sponges have been divided into two groups based on either the nature of their skeleton,
Calcarea + Silicea (hexactinellids + demosponges including homoscleromorphs), or
based on the syncytial organization of the hexactinellids, Symplasma (hexactinellids) + Cellularia (sponges with cellular organization: Calcarea + demosponges + homoscleromorphs). More recently Homoscleromorpha was erected as the fourth class
of sponges, but its phylogenetic affiliations with other sponge groups remain
contentious, in part because the intra-class relationships of sponges have been addressed using mostly singl
e gene phylogenies or combinations of few genes. Here, a
phylogenomic approach using protein-encoding genes has been applied to examine
deep relationships within sponges. This analysis included 22 sponges (twelve of them
sequenced de novo with Illumina RNA
seq technology) resulting in two different matrices
based on different orthologous gene sets, one including 78 genes (SCPD; Torruella et
al., 2012) and the other containing 128 genes (P127; Philippe et al., 2009). The SCPD
matrix provided higher resolution
for major sponge clades, although calcareous
sponges suffered from systematic artifacts when using the P127 matrix. The analysis of
the SCPD matrix showed a monophyletic Porifera with a deep split between a
homoscleromorph + calcareous sponge clade and a
hexactinellid + demosponge clade.
Within demosponges, the clades G1 to G4 were recovered. A long suspected
placement of Spongillidae within the G4 group instead of within G3
(Haploscleromorpha) is supported by our analyses. Our results provide insight into
the early evolution of sponges and one of our data sets supports monophyly of Porifera.
eng
closedAccess
Phylogenomics reveals polyphyly of haploscleromorph clades and provides insight into the early evolution of sponges
póster de congreso
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URL
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File
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accesoRestringido.pdf