Abstract. The aim of this paper is to describe morphological characteristics of fresh- water triclads in Herzegovina and to provide a key for their. 1 Introduction. The polyclads are the most primitive free living flatworms of the phylum Platyhelminthes. These worms are dorso-ventrally. -Eight new species belonging to the genus Cycloporus (Platyhelminthes. Polycladida,. Euryleptidae) are described from Australasian waters including eastern.
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However, the morphological characters of the copulatory apparatus of the sexual specimens allowed the species to be described.
Microturbellarians (Platyhelminthes and Acoelomorpha) in Brazil: invisible organisms?
All of the analysed individuals, except specimen s Figure S1the origin of heteroplasmic individuals that simultaneously present haplotypes A, B and C is difficult to envision. Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service.
To troubleshoot, please check our FAQsand if you can’t find the answer there, please contact us. However, introductions due to human activities have been documented in other freshwater planarians, such as Girardia tigrina [ 18 ] and Schmidtea polychroa [ 19 ] and more recently have also been proposed for other Dugesia species [ 20 ], but in all these cases the introduced animals either have a restricted distribution Dugesia or its introduction and progression in the new areas has been followed by scientist.
Those populations for which only one sequence was available were not included. The result shows that in the latter there is a significant deviation from the 1: Table 4 Polymerase mistake versus heteroplasmy test.
Additionally, in the Greek population from Rhodes s56D. Individuals from the Boussadia and Soukra populations s39 and s36 in Tunisia reproduce sexually [ 56 ]. Expected number of point mutations for playthelminthes individual based on a polymerase error rate of 6. The white dots represent populations in which all of the individuals are non-polymorphic. Geological Society of Junal All populations were identified as D. The potential distribution predicted with the climatic models for D.
Turbellaria, Tricladida Ital J Zool. Fissiparous reproduction can have effects on the distribution of genetic variability within the populations and even on individuals that could perhaps help disentangle this situation.
The haplotype network was based on an alignment of sequences and a length of base pairs. The distribution and frequency of the most frequent haplotypes and the presence of heteroplasmic individuals allow us to gain an understanding of the recent history of the species, together with previous knowledge on its phylogenetic relationships and age: The theoretical feasibility of student worksheets was reviewed based on the result of the validation conducted by two lecturers and two biology teachers of senior high school on the feasibility of content, language, and presentation.
Associated Data Supplementary Materials Additional file 1: Observations on fission, maturation and reproduction in Dugesia biblica Turbellaria, Tricladida from Israel.
The absence or low frequency of heteroplasmic specimens in a specific locality of fissiparous reproducing individuals could be interpreted as a consequence of a recent bottleneck, potentially because of recent colonisation by a few individuals or recovery from a recent population-wide decrease.
Search my Subject Specializations: Genetic uniformity characterizes the invasive spread of water hyacinth Eichhornia crassipesa clonal aquatic plant. In the present study, we analysed the genetic diversity and structure using COI sequences of a broad sampling of D. The observation that 3 out of the 13 sequenced individuals from this population were heteroplasmic could indicate that the individuals with a copulatory apparatus were actually ex-fissiparous or that the population is composed of a mix of sexual and fissiparous individuals.
In this area, D.
Molecular phylogeny of Geoplaninae Platyhelminthes challenges current classification: Evidence for recent human-mediated range expansion? Insufficient information provided by the few most common haplotype distributions and the fact that the presence of multiple single jhrnal in a population not necessarily are a consequence of an old age for the population at that locality, platyhelminnthes it difficult to determine where colonisation began in the Mediterranean.
Supplementary Material Additional file 1: First, it would be necessary to sample in the diverse biomes, as well as in the various river and sea basins, based on standardized sampling protocols. Under the hypothesis that D.
Dugesia sicula (Platyhelminthes, Tricladida): the colonizing success of an asexual Planarian
Abstract Background Dugesia sicula is the only species of its genus not presenting an endemic or restricted distribution within the Mediterranean area. Morphological, karyological and biochemical data in free-living platyhelminyhes symbiotic Platyhelminthes; pp. The remaining haplotypes were unique in the majority of the cases and showed a single difference from the A, B or C haplotypes.
We intend here to summarize the biogeographical distribution and ecological aspects of microturbellarians recorded for Brazil, indicating the main gaps in their knowledge and possible actions to enhance studies on this group. Ponte Saraceni on river Simeto, Sicily. Annu Rev Cell Dev Ppatyhelminthes.
Origin and expansion A recent study [ 8 ] emphasised that D. Stocchino also for sharing information on the likely presence of D. Rosenbaum G, Lister GS. The catenulids are characterised by their single, biciliate protonephridia. Effect of prolonged vegetative reproduction of olive tree cultivars Olea europaea L. Our aim was to determine the centre of colonisation origin, whether the populations are recent, and whether platyhelmintnes species is expanding.
The species presents 3 most frequent haplotypes, differing in a maximum of 11 base pairs.