01214nas a2200157 4500008004100000022001400041245016300055210006900218300001100287490000700298520064100305100001600946700002000962700002200982856005201004 1981 eng d a0392-671000aDugesia hepta, nuova specie di Planaria di acqua dolce di Sardegna appartenente alla superspecie Dugesia gonocephala (Dugès) (Turbellaria, Tricladida)0 aiDugesia heptai nuova specie di Planaria di acqua dolce di Sarde a97-1070 v203 a

A planarian belonging to the group D. gonocephala s.l. was found in 13 sites in Sardinia (11 in the catchment area of the Rio Mannu of Porto Torres and 2 in that of the Coghinas). It is morphologically related to D. benazzii Lepori of Sardinia and Corsica but presents a different karyotype: 2n = 14; n = 7 chromosomes instead of 2n = 16; n = 8 chromosomes. The latter is the most common in the superspecies D. gonocephala of central European and Mediterranean distrubution areas. The planarian in question was considered a distinct species with the group D. gonocephala s.l. and the denomination D. hepta sp. nov. is proposed.

1 aPala, Maria1 aCasu, Salvatore1 aVacca, Rosa, Alba uhttps://continenticola.myspecies.info/node/135301912nas a2200193 4500008004100000245018700041210006900228260001200297300001200309490000700321520121200328100002101540700001801561700001601579700003201595700002001627700001901647856005201666 2009 eng d00aMolecular barcoding and phylogeography of sexual and asexual freshwater planarians of the genus Dugesia in the Western Mediterranean (Platyhelminthes, Tricladida, Dugesiidae).0 aMolecular barcoding and phylogeography of sexual and asexual fre c09/2009 a835-8450 v523 a

Planarians of the genus Dugesia have a worldwide distribution with high species diversity in the Mediterranean area. In this area, populations with a triploid karyotype that reproduce by fissiparity are exceptionally frequent, outnumbering the sexual populations. This situation poses interesting questions, such as the age of these asexual lineages, whether they all belong to the same species or whether the triploidization event is recurrent, and what factors (climatic, geographical, historical...) explain the prevalence of these asexual forms. However, asexual populations cannot be assigned to a species due to the lack of copulatory apparatus - the main structure used in species identification. In this study, we have developed a DNA barcoding method, based on COI and ITS-1 sequences, which allows the assignment of the fissiparous forms to sexual species. At the same time, phylogenetic analysis from species of the western Mediterranean have unveiled the presence of species with highly differentiated populations alongside species with a wide distribution and almost no genetic variation. The roles of habitat instability, dispersal capacity and human activities are briefly discussed.

1 aLázaro, Eva, M.1 aSluys, Ronald1 aPala, Maria1 aStocchino, Giacinta, Angela1 aBaguñà, Jaume1 aRiutort, Marta uhttps://continenticola.myspecies.info/node/1241