Data/hora: 17/06/2024 07:16:21

Provedor de dados: | 27
País: | Belgium
Título: | The anatomy and ultrastructure of the proboscis in &lt;i&gt;Zonorhynchus&lt;/i&gt;-species and implications for phylogenetic relationships within the Eukalyptorhynchia Meixner, 1928 (Platyhelminthes, Rhabdocoela)
Autores: | De Vocht, A.J.-P.; Schockaert, E.R.
Data: | 1999
Ano: | 1999
Palavras-chave: | Phylogeny; Proboscis; Ultrastructure; Eukalyptorhynchia; Platyhelminthes; Rhabdocoela; Zonorhynchus.
Resumo: | The ultrastructural morphology of the proboscis in species of the genus &lt;i&gt;Zonorhynchus&lt;/i&gt; 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 &lt;i&gt;Zonorhynchus&lt;/i&gt;-species is a common feature for all eukalyptorhynch species investigated. A syncytial basal cone epithelium is a synapomorphic character for all species except &lt;i&gt;Toia calceformis&lt;/i&gt; Brunet, 1973 and &lt;i&gt;Nannorhynchides herdlaensis&lt;/i&gt; 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 &lt;i&gt;Zonorhynchus&lt;/i&gt;. The absence of multiciliary receptors is regarded as the plesiomorphic state and distinguishes &lt;i&gt;Zonorhynchus&lt;/i&gt;-species, &lt;i&gt;T. calceformis&lt;/i&gt; and &lt;i&gt;N. herdlaensis&lt;/i&gt; from other Eukalyptorhynchia investigated. &lt;i&gt;Cicerina remanei&lt;/i&gt; Meixner, 1928, &lt;i&gt;Psammorhynchus tubulipenis&lt;/i&gt; Meixner, 1938 and &lt;i&gt;Cytocystis clitellatus&lt;/i&gt; Karling, 1953 have two insunk sensory organs with multiciliary receptors. The presence of four epithelial belts in &lt;i&gt;Zonorhynchus&lt;/i&gt;-species as in &lt;i&gt;C. remanei, P. tubulipenis&lt;/i&gt; and &lt;i&gt;C. clitellatus&lt;/i&gt; 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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.vliz.be/nl/open-marien-archief?module=ref&refid=1116
Fonte: | %3Ci%3EBelg.+J.+Zool.+129%281%29%3C%2Fi%3E%3A+219-234
Fonte: | info:eu-repo/semantics/restrictedAccess