Structure of the choanocyte kinetid in the sponge Haliclona sp. (Demospongiae: Haplosclerida) and its implication for taxonomy and phylogeny of Demospongiae

Research output

Abstract

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 Metazoa and Choanoflagellata, as well as for Porifera and other Metazoa. For this purpose, a comparative analysis of phylogenically informative structures, such as the kinetid, is needed. This article presents data on the structure of the choanocyte kinetid in Haliclona sp., which was investigated for the first time. The reconstruction of the kinetid based on ultrathin serial sections shows that it lacks an accessory centriole; it has fibrillar roots despite the basal position of the nucleus; two-to-three triplets of the kinetosome are longer than the others; bundles of lateral microtubules arise from fibrillar roots and reach the cytoplasmic membrane in the region of intercellular contact. The studies of the kinetid in the few representatives of Demospongiae investigated showed the compatibility of the data on the ultrastructure and molecular phylogeny.

Original languageEnglish
Pages (from-to)595-601
Number of pages7
JournalBiology Bulletin
Volume43
Issue number7
DOIs
Publication statusPublished - 1 Dec 2016

Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

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