| Registro completo |
| Provedor de dados: |
OMA
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| País: |
Belgium
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| Título: |
The anatomy and ultrastructure of the proboscis in <i>Zonorhynchus</i>-species and implications for phylogenetic relationships within the Eukalyptorhynchia Meixner, 1928 (Platyhelminthes, Rhabdocoela)
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| Autores: |
De Vocht, A.J.-P.
Schockaert, E.R.
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| Data: |
1999
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| Ano: |
1999
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| Palavras-chave: |
Phylogeny
Proboscis
Ultrastructure
Eukalyptorhynchia
Platyhelminthes
Rhabdocoela
Zonorhynchus
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| Resumo: |
The ultrastructural morphology of the proboscis in species of the genus <i>Zonorhynchus</i> Karling, 1952 is investigated. The proboscis epithelia are organized in four belts. The apical cone epithelium has intra-epithelial nuclei, and the distal belt of the sheath epithelium is formed by numerous cells lacking a distinct pattern. Multiciliary receptors are lacking. The diversity in ultrastructural data on the proboscis is used to elucidate the phylogenetic relationships within the Cicerinidae and Eukalyptorhynchia. A bipartite cone epithelium as found in <i>Zonorhynchus</i>-species is a common feature for all eukalyptorhynch species investigated. A syncytial basal cone epithelium is a synapomorphic character for all species except <i>Toia calceformis</i> Brunet, 1973 and <i>Nannorhynchides herdlaensis</i> Karling, 1956. A syncytial proximal belt of the sheath epithelium, and intra-epithelial nucleus(i) in the apical cone epithelium constitute apomorphic features for species of the genus <i>Zonorhynchus</i>. The absence of multiciliary receptors is regarded as the plesiomorphic state and distinguishes <i>Zonorhynchus</i>-species, <i>T. calceformis</i> and <i>N. herdlaensis</i> from other Eukalyptorhynchia investigated. <i>Cicerina remanei</i> Meixner, 1928, <i>Psammorhynchus tubulipenis</i> Meixner, 1938 and <i>Cytocystis clitellatus</i> Karling, 1953 have two insunk sensory organs with multiciliary receptors. The presence of four epithelial belts in <i>Zonorhynchus</i>-species as in <i>C. remanei, P. tubulipenis</i> and <i>C. clitellatus</i> is considered a shared plesiomorphic state within the Eukalyptorhynchia. The presence of a third belt in the sheath epithelium is a synapomorphic character of all Koinocystididae, Cystiplanidae and Polycystididae.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.vliz.be/nl/open-marien-archief?module=ref&refid=1116
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| Fonte: |
%3Ci%3EBelg.+J.+Zool.+129%281%29%3C%2Fi%3E%3A+219-234
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| Direitos: |
info:eu-repo/semantics/restrictedAccess
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