نتایج جستجو برای: demospongiae
تعداد نتایج: 404 فیلتر نتایج به سال:
BACKGROUND Demosponges are challenging for phylogenetic systematics because of their plastic and relatively simple morphologies and many deep divergences between major clades. To improve understanding of the phylogenetic relationships within Demospongiae, we sequenced and analyzed seven nuclear housekeeping genes involved in a variety of cellular functions from a diverse group of sponges. MET...
Carnivorous sponges (family Cladorhizidae) lack the aquiferous system and choanocytes and, therefore, their reproduction in particular spermatogenesis is unusual for Porifera. We studied a carnivorous sponge Lycopodina hypogea using confocal microscopy, SEM TEM. In brief, L. proceeds as follows. Male cells derive from archaeocyte-like cells. During its first divisions, spermatogonia are surroun...
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