1,720,967 research outputs found
Overview of life cycles in model species of the genus Dugesia (Platyhelminthes: Tricladida)
No full textAn overview of the reproductive patterns of seven model species of triclads belonging to the genus Dugesia from circum-
Mediterranean and Afrotropical freshwater is provided. Populations can reproduce exclusively sexually or exclusively
asexually by fissiparity but the coexistence of both reproductive modes is displayed by some lineages. The comparison of
data on the life cycles as documented in the literature with new data highlights a wide array of potentialities to shift from an
asexual to a sexual state and vice versa in species with fissiparous populations. Life cycles are poorly diversified in species
reproducing only sexually. Among fissiparous populations, planarians may sexualise, displaying various grades of reproductive
functionality under laboratory conditions. Unexpectedly, asexual reproduction by fission occurred spontaneously in two
species during the sexual state of ex-fissiparous individuals. The capacity to develop or reduce the reproductive apparatus
during the life cycle either in sexual or in ex-fissiparous individuals illustrates the considerable morphogenetic plasticity in
planarians. The Dugesia case contributes to the modelling of reproductive patterns and strategies in basal Metazoa as a
continuum from sexual to asexual reproduction and vice versa, rather than a simple clear-cut alternative
Biodiversità del parco dell’Asinara: i Turbellari (platelminti) delle acque dolci superficiali
No full text
Karyology and karyometric analysis of an Afrotropical freshwater planarian (Platyhelminthes, Tricladida)
No full textIntegrative taxonomy of a new species of planarian from the Lake Ohrid basin, including an analysis of biogeographical patterns in freshwater triclads from the Ohrid region (Platyhelminthes, Tricladida, Dugesiidae)
No full textA new species of the genus Dugesia is described from the Lake Ohrid region in the western part of the
Balkan Peninsula, forming the first fully documented species description for this genus in the Ohrid
area. The morphological species delimitation is supported by complementary molecular, karyological,
and cytogenetic data available from the literature. Therefore, species delineation is based on a truly
integrative approach. Further, a short account on the degree of freshwater planarian endemicity in the
Ohrid region is provided
Morfogenesi cronica dei poriferi: la struttura della matrice extracellulare è modulata dai glicosaminoglicani?
No full textAfrican planarians: Dugesia aethiopica sp. n. (Platyhelminthes, Tricladida) from Lake Tana (NW Ethiopia)
No full textMorfologia e ultrastruttura degli spermatodesmi di Carabus (Macrotorax) morbillosus Fabricius, 1792 (Coleoptera, Carabidae)
No full textL’apparato riproduttore di Dugesia lepori (Platyhelminthes, Tricladida): morfologia e funzione
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