Results 171 to 180 of about 4,207 (201)

The aquiferous systems of three marine demospongiae

Journal of Morphology, 1975
AbstractThe 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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Sponges of the family Axinellidae (Porifera: Demospongiae) in Indonesia

Zootaxa, 2016
Nine species in five genera of the family Axinellidae, including three new species, Axinella badungensis sp. nov., A. balinensis sp. nov. and Phycopsis pesgalli sp. nov. are recorded from Indonesian waters within the limits of the Western Coral Triangle province. Descriptions and discussion of those species are presented here.
Alvarez, Belinda, De Voogd, Nicole J., Soest, Van   +2 more
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Larval development in the Homoscleromorpha (Porifera, Demospongiae)

Invertebrate Biology, 2003
Abstract. 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, Alexander Ereskovsky, Chantal Bézac, Daria Tokina   +3 more
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Sterols of the sponges (porifera, class demospongiae)

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 1979
Abstract 1. 1. The sterol composition of six species of the sponges (class Demospongiae) was examined mainly by using GLC and silver nitrate-impregnated silicic acid chromatography. 2. 2. In the sponges of the order Haplosclerina, Gelliodes fibulata contained cholestanol (41.8% of total sterols) as the most abundant sterols, but Gelliodes ...
Akio Kanazawa, Shin-ichi Teshima, Shin-ichi Hyodo   +2 more
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Structure of the choanocyte kinetid in the sponge Haliclona sp. (Demospongiae: Haplosclerida) and its implication for taxonomy and phylogeny of Demospongiae

Biology Bulletin, 2016
Sponges are a group of primitive animals that are of particular interest in terms of evolutionary theory. Molecular and phylogenic studies have revealed the common origin of sponges and Metazoa and the relationship of Metazoa to Choanoflagellata. Comparative studies of the morphology have allowed reconstruction of the structure of ancestors common to ...
I. R. Pozdnyakov, S. A. Karpov
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North coast of Brazil (Demospongiae, Poecilosclerida)

2004
Mothes, Beatriz, De, Maurício A., Campos (2004): North coast of Brazil (Demospongiae, Poecilosclerida).
Mothes, Beatriz, De, Maurício A., Campos   +2 more
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The spermatogenesis ofHalichondria panicea (Porifera, Demospongiae)

Zoomorphology, 1990
Spermatogenesis 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, 2000
Abstract 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., Sciscioli M., Scalera Liaci L., Santarelli G., GAINO, Elda Rosa   +4 more
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Choanocyte ultrastructure in Halisarca dujardini (Demospongiae, Halisarcida)

Journal of Morphology, 2008
AbstractUnderstanding 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, Manuel, Maldonado   +1 more
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In situ pumping activities of tropical Demospongiae

Marine Biology, 1971
Studies employing Scuba techniques were carried out on populations of 3 species of tropical demosponges to determine in situ patterns of water-pumping activity. Short-term changes in individual activity of deep-water species (15 to 55 m) were determined from continuous recordings of exhalant current velocities.
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