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Systematics and evolution of Demospongiae
Canadian Journal of Zoology, 2006 Systematic and evolutionary studies of Demospongiae Sollas, 1885 are a very dynamic field of research. The scientific knowledge pertaining to Demospongiae systematics has been recently assembled in the collective book Systema Porifera. However, a general consensus among spongologists has not yet been achieved regarding this group and the phylogenetic ...
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Notes for a Short Course: Studies in Geology, 1983
Demospongia have persisted as a major class of sponges since inception of the record of the phylum in the Cambrian. The class includes about 95% of all sponges in modern seas and all of the known freshwater forms, as well. These sponges occupy environments that range from warm, shallow subtidal, high energy to quiet, cold oceanic deeps.
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Demospongia have persisted as a major class of sponges since inception of the record of the phylum in the Cambrian. The class includes about 95% of all sponges in modern seas and all of the known freshwater forms, as well. These sponges occupy environments that range from warm, shallow subtidal, high energy to quiet, cold oceanic deeps.
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Three new Raspailiidae Hentschel, 1923 (Axinellida, Demospongiae) from Peru
Zootaxa, 2020Currently 26 sponge species are known for the Peruvian coast, but so far no raspailiids had been recorded from this region. Raspailiidae are distributed worldwide and its species are characterized by encrusting, massive, lobate, fan-shaped or branching growth forms, usually with a very hispid surface.
Recinos, Radharanne +3 more
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Molecular Phylogenetics and Evolution, 2012
The current morphological classification of the Demospongiae G4 clade was tested using large subunit ribosomal RNA (LSU rRNA) sequences from 119 taxa. Fifty-three mitochondrial cytochrome oxidase 1 (CO1) barcoding sequences were also analysed to test whether the 28S phylogeny could be recovered using an independent gene.
Morrow, C.C. +5 more
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The current morphological classification of the Demospongiae G4 clade was tested using large subunit ribosomal RNA (LSU rRNA) sequences from 119 taxa. Fifty-three mitochondrial cytochrome oxidase 1 (CO1) barcoding sequences were also analysed to test whether the 28S phylogeny could be recovered using an independent gene.
Morrow, C.C. +5 more
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Choanocyte ultrastructure in Halisarca dujardini (Demospongiae, Halisarcida)
Journal of Morphology, 2008AbstractUnderstanding poriferan choanocyte ultrastructure is crucial if we are to unravel the steps of a putative evolutionary transition between choanoflagellate protists and early metazoans. Surprisingly, some aspects of choanocyte cytology still remain little investigated.
Elisaveta, Gonobobleva +1 more
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The spermatogenesis ofHalichondria panicea (Porifera, Demospongiae)
Zoomorphology, 1990Spermatogenesis of the marine spongeHalichondria panicea begins with the break up of choanocyte chambers, choanocytes constituting the origin of spermatogonia. The transition from choanocytes to spermatogonia is direct, without cell division. Already the spermatogonia are flagellated.
Dagmar Barthel, Andrea Detmer
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Sexual reproduction ofCinachyra tarentina(porifera, demospongiae)
Italian Journal of Zoology, 2000Abstract The sexual reproductive cycle of the Tetractinomorpha Spirophorida Cinachyra tarentina was studied mainly using light microscopy on samples collected in South Italy over a 2‐year period. Some aspects of the egg morphology were observed using transmission electron microscopy.
Lepore E. +4 more
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THE GENUS PLACOSPONGIA (DEMOSPONGIAE: CLIONAIDA) FROM THE COLOMBIAN CARIBBEAN
Zootaxa, 2023The genus Placospongia Gray, 1867 is a group of sponges widely distributed in the world. It currently has 11 valid species, where five of those, Placospongia caribica Rützler et al., 2014, P. cristata Boury-Esnault, 1973, P. intermedia Sollas, 1888, P. ruetzleri van Soest, 2017 and P. giseleae Mácola & Menegola, 2021, are distributed in the Central
JESÚS DAVID-COLÓN +2 more
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The aquiferous systems of three marine demospongiae
Journal of Morphology, 1975AbstractThe aquiferous systems of three common, coastal, marine Demospongiae, Halichondria panicea (Pallas), Haliclona permollis (Bowerbank) and Microciona Prolifera (Ellis and Solander), are analyzed by measurements of cross‐sectional areas of conducting elements. The patterns in demosponges of extremely different organizational morphologies are found
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Larval development in the Homoscleromorpha (Porifera, Demospongiae)
Invertebrate Biology, 2003Abstract. Embryonic development from coeloblastula to fully developed larva was investigated in 8 Mediterranean homoscleromorph species: Oscarella lobularis, O. tuberculata, O. microlobata, O. imperialis, Plakina trilopha, P. jani, Corticium candelabrum, and Pseudocorticium jarrei.
Nicole Boury‐Esnault +3 more
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