The ultrastructure of the apical organ of Curini-Galletti's larva, a new polyclad larval type.
Polycladida
apical organ
ciliary tuft
larva
lobes
Journal
Cell biology international
ISSN: 1095-8355
Titre abrégé: Cell Biol Int
Pays: England
ID NLM: 9307129
Informations de publication
Date de publication:
29 Feb 2024
29 Feb 2024
Historique:
revised:
15
01
2024
received:
05
10
2023
accepted:
30
01
2024
medline:
29
2
2024
pubmed:
29
2
2024
entrez:
29
2
2024
Statut:
aheadofprint
Résumé
Polycladida are the only free-living flatworms with a planktonic larval stage in some species. Currently, it is not clear if a larval stage is ancestral in polyclads, and which type of larva that would be. Known polyclad larvae are Müller's larva, Kato's larva and Goette's larva, differing by body shape and the number of lobes and eyes. A valuable character for the comparison and characterisation of polyclad larval types is the ultrastructural composition of the apical organ. This organ is situated at the anterior pole of the larva and is associated with at least one ciliary tuft. The larval apical organ of Theama mediterranea features two multiciliated apical tuft sensory cells. Six unfurcated apical tuft gland cell necks are sandwiched between the apical tuft sensory cells and two anchor cells and have their cell bodies located lateral to the brain. Another type of apical gland cell necks is embedded in the anchor cells. Ventral to the apical tuft, ciliated sensory neurons are present, which are neighbouring the cell necks of two furcated apical tuft gland cells. Based on the ultrastructural organisation of the apical organ and other morphological features, like a laterally flattened wedge-shaped body and three very small lobes, we recognise the larva of T. mediterranea as a new larval type, which we name Curini-Galletti's larva after its first discoverer. The ultrastructural similarities of the apical organ in different polyclad larvae support their possible homology, that is, all polyclad larvae have likely evolved from a common larva.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : Tiroler Wissenschaftsförderung
Organisme : Fonds National de la Recherche Luxembourg
ID : 13569708
Organisme : Österreichischen Akademie der Wissenschaften
Informations de copyright
© 2024 The Authors. Cell Biology International published by John Wiley & Sons Ltd on behalf of International Federation of Cell Biology.
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