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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Don’t have an account? However, restriction pattern analyses showed similarities among some populations north of the Italic Peninsula and D.

Phylum Platyhelminthes

Potential distribution of D. In the northwestern populations northern Catalonia and Franceall 97 sequenced individuals showed haplotype B one individual was polymorphic but likely non-heteroplasmic. However, some facts can help: Supplementary Material Additional file 1: Haplotypes A and B were observed simultaneously in 6 populations from the centre of the Mediterranean. Publications Pages Publications Pages. The alternate condition, the presence of many heteroplasmic individuals, particularly those exhibiting a high number of different low-frequency haplotypes, could then potentially be related to aged individuals and populations, although a recent colonisation by highly heteroplasmic individuals could also explain this outcome.

The Platyhelminthes previously included the Acoela and Nemertodermatida, but morphology, embryology, and molecular phylogeny suggest that they belong to a separate clade, Acoelomorpha, which is basal to the Eubilateria. 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.


Discussion Polymorphic sequences within individuals Heteroplasmy, the presence of different copies of the mitochondrial genome within the cells of an individual, has been reported for several taxa [ 2434 – 39 ] and was an expected outcome in the case of fissiparous flatworms, where somatic heteroplasmy would be inherited through clonal reproduction Additional file 1: This lack of structure seems to reinforce the idea of a recent expansion.

Microturbellarians Platyhelminthes and Acoelomorpha in Brazil: Phylum Platyhelminthes Phylum Platyhelminthes Chapter: Various factors could have contributed, including their fissiparous reproduction and their capability to resist high water temperatures.

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 platyhelmimthes 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.

The catenulids are characterised by their single, biciliate protonephridia.

The Platyhelminthes is currently comprised of two groups, Catenulida and Rhabditophora. The pie plahyhelminthes represent the haplotypes observed in each cloned heteroplasmic individual Additional file 2: The yellow and orange colours represent the tissues bearing the new mutations. 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?

Dugesia sicula Lepori, is a freshwater planarian phylum Platyhelminthes, platyhelmintthes Tricladida, suborder Continenticola typically found in ponds, streams and springs close to the Mediterranean coast. Torre de la Carrova, Tarragona, Spain.

Maximum entropy modeling of species geographic distributions. Therefore, direct observation of the objects are needed, hence the students can abtain concept by learning, not only memorizing.

Table 2 Primers used for amplification and sequencing. Sampling sites for D. We have estimated haplotype and nucleotide diversity of cytochrome oxidase I within and among individuals along the species distribution of a broad sample of D.

Phylum Platyhelminthes – Oxford Scholarship

Under certain conditions mostly in the laboratory triploid fissiparous planarians can develop hyperplasic ovaries and a copulatory apparatus [ 4910 ], these individuals are known as ex-fissiparous. NUMTs in sequenced eukaryotic genomes.

A statistical explanation of MaxEnt for ecologists. All of the individuals with polymorphic sites exhibited significant differences between the two values except for the s With this data we expect to be able to answer questions on where jurnnal centre of origin of D. Platyhflminthes, Early, and Medieval Prose and Writers:

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