Results 31 to 40 of about 3,197 (136)
Tissue composition of sponges from the Weddell Sea, Antarctica: not much meat on the bones [PDF]
, 1995 The tissue of 31 demosponge and 7 hexachnelhd species was analyzed for its composition of organic and lnorganic matter With one excephon (Hahclona cf gausaana) inorganic matter i e n~ostly the siliceous skeleton, accounted for most of the dry weight ...
Barthel, Dagmar
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A horizontal gene transfer supported the evolution of an early metazoan biomineralization strategy
BMC Evolutionary Biology, 2011 Background The synchronous and widespread adoption of the ability to biomineralize was a defining event for metazoan evolution during the late Precambrian/early Cambrian 545 million years ago.
Wörheide Gert +3 more
doaj +1 more source
The mitochondrial genomes of sponges provide evidence for multiple invasions by Repetitive Hairpin-forming Elements (RHE) [PDF]
, 2009 Background: The mitochondrial (mt) genomes of sponges possess a variety of features, which appear to be intermediate between those of Eumetazoa and non-metazoan opisthokonts.
Dirk Erpenbeck +3 more
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Marine Drugs, 2019 The bioactive bromotyrosine-derived alkaloids and unique morphologically-defined fibrous skeleton of chitin origin have been found recently in marine demosponges of the order Verongiida.
Lamiaa A. Shaala +17 more
doaj +1 more source
Frontiers in Marine Science, 2020 Siliceous spicules in demosponges exist in a variety of shapes, some of which look like minute spheres of glass. They are called “sterrasters” when they belong to the Geodiidae family (Tetractinellida order) and “selenasters” when they belong to the ...
Paco Cárdenas
doaj +1 more source
Biodiversity of Spongosorites coralliophaga (Stephens, 1915) on coral rubble at two contrasting cold-water coral reef settings [PDF]
, 2015 The authors would like to thank Bill Richardson (Master), the crew of the RRS James Cook, Will Handley and the Holland-I ROV team. We also thank all the specialists in taxonomy that provided important help with identification of species: Professor Paul ...
Henry, Lea-Anne +3 more
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Scientific Reports, 2017 The two major extant groups of siliceous sponges, Demospongiae and Hexactinellida, are generally regarded as sister groups forming the clade Silicea, although the nature of their last common ancestor is uncertain.
Joseph P. Botting +2 more
doaj +1 more source
Affinities of the family Sollasellidae (Porifera, Demospongiae). II. Molecular evidence [PDF]
, 2007 This is the second part of a revision and re-classification of the demosponge family Sollasellidae, and an example of a successful use of combined morphological and molecular data. Sollasella had been a poorly known, long forgotten taxon, placed incertae
Degnan, Bernard M. +5 more
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Early evolution of the LIM homeobox gene family
BMC Biology, 2010 Background LIM homeobox (Lhx) transcription factors are unique to the animal lineage and have patterning roles during embryonic development in flies, nematodes and vertebrates, with a conserved role in specifying neuronal identity.
Degnan Bernard M +6 more
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Benthic foraminifers and siliceous sponge spicules assemblages in the Quaternary rhodolith rich sediments from Pontine Archipelago shelf [PDF]
, 2016 The bottom samples (Quaternary in age) of two cores (CS1 and Caro1) collected at 60 and 122 m water depth in the marine area near Ponza Island (Pontine Archipelago, Tyrrhenian Sea) are investigated.
Chiocci, Francesco Latino +5 more
core +1 more source