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Ultrastructure of gill cilia and ciliary rootlets of Chaetoderma nitidulum Lovén 1844 (Mollusca, Chaetodermomorpha)
Author(s) -
Lundin Kennet,
Schander Christoffer
Publication year - 1999
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1046/j.1463-6395.1999.00014.x
Subject(s) - cilium , biology , basal body , anatomy , ultrastructure , mollusca , motile cilium , flagellum , microbiology and biotechnology , zoology , paleontology , bacteria
Cilia and associated structures on the gill lamellae on the ctenidum of Chaetoderma nitidulum were studied. The gill cilia are very long and have a whip‐like narrow portion distally, where only three microtubule doublets continue to the distal tip. In the transition zone between the cilium and the centriolar triplet section of the basal body there is a dense plate, an aggregation of granules and a ciliary necklace with four strands. Further down there is a short cross‐striated basal foot and two conical cross‐striated ciliary rootlets. The first rootlet is flattened and directed forward. It connects distally with the basal feet of other adjacent cilia. The second rootlet is rounded in cross‐section and vertically directed. The epithelial structures of Chaetoderma show similarities with other Mollusca. We found no structural characters that could support the current hypothesis of a close relationship of Xenoturbella to the Mollusca.