Dittmann, Isabel L;
Grosbusch, Alexandra L;
Nagler, Magdalena;
Salvenmoser, Willi;
Zankel, Armin;
Telford, Maximilian J;
Egger, Bernhard;
(2023)
The ultrastructure of the apical organ of the Müller's larva of the tiger flatworm Prostheceraeus crozieri.
Cell Biology International
10.1002/cbin.12023.
(In press).
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Abstract
The tiger flatworm Prostheceraeus crozieri (Polycladida) develops via an eight-lobed, and three-eyed planktonic Müller's larva. This larva has an apical organ, ultrastructural details of which remain elusive due to a scarcity of studies. The evolution and possible homology of the polyclad larva with other spiralian larvae is still controversial. Here, we provide ultrastructural data and three-dimensional reconstructions of the apical organ of P. crozieri. The apical organ consists of an apical tuft complex and a dorso-apical tuft complex. The apical tuft complex features a central tuft of five long cilia, which emerge from four or five individual cells that are themselves encircled by two anchor cells. The necks of six multibranched gland cells are sandwiched between ciliated tuft cell bodies and anchor cells. The proximal parts of the ciliated cell bodies are in contact with the lateral brain neuropil via gap junctions. Located dorsally of the apical tuft complex, the dorso-apical tuft complex is characterized by several long cilia of sensory neurons, these emerge from an epidermal lumen and are closely associated with several gland cells that form a crescent apically around the dorsal anchor cell, and laterally touch the brain neuropil. Such ciliated sensory neurons emerging from a ciliated lumen are reminiscent of ampullary cells of mollusc and annelid larvae; a similar cell type can be found in the hoplonemertean decidula larva. We hypothesize that the ampullary-like cells and the tuft-forming sensory cells in the apical organs of these spiralian larvae could be homologous.
| Type: | Article |
|---|---|
| Title: | The ultrastructure of the apical organ of the Müller's larva of the tiger flatworm Prostheceraeus crozieri |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/cbin.12023 |
| Publisher version: | https://doi.org/10.1002/cbin.12023 |
| Language: | English |
| Additional information: | © 2023 The Authors. Cell Biology International published by John Wiley & Sons Ltd on behalf of International Federation of Cell Biology. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Polycladida, apical organ, ciliary tuft, frontal organ, larva, ultrastructure |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10168634 |
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