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7 results for “Murella muralis”
Data from: A question of time: the land snail Murella muralis (Gastropoda: Pulmonata) reveals constrains to past ecological speciation
The lively debate about speciation currently focuses on the relative importance of factors driving population differentiation. While many studies are increasingly producing results on the importance of selection, little is known about the interaction between drift and selection. Moreover there is still little knowledge on the spatial-temporal scales at which speciation occurs, i.e. arrangement of habitat patches, abruptness of habitat transitions, climate and habitat changes interacting with selective forces. To investigate these questions, we quantified variation on a fine geographical scale analysing morphological (shell) and genetic datasets coupled with environmental data in the land snail Murella muralis, endemic to the Mediterranean island of Sicily. Analysis of a fragment of the mitochondrial DNA Cytochrome Oxidase I gene (COI) and eight nuclear microsatellite loci showed that genetic variation is highly structured at a very fine spatial scale by local palaeogeographical events and historical population dynamics. Molecular clock estimates, calibrated here specifically for Tyrrhenian land snails, provided a framework of palaeogeographical events responsible for the observed geographical variations and migration routes. Finally, we showed for the first time well documented lines of evidences of selection in the past, which explains divergence of land snail shell shapes. We suggest that time and palaeogeographical history acted as constraints in the progress along the ecological speciation continuum. Our study shows that testing for correlation among palaeogeography, morphology and genetic data on a fine geographical scale provides information fundamental for a detailed understanding of ecological speciation processes.
Figure 5 from: Ezzine IK, Dimassi N, Pfarrer B, Said K, Neubert E (2018) New records of the endemic Sicilian land snail species Marmorana (Murella) muralis (O. F. Müller, 1774) from the north of Tunisia (Pulmonata, Gastropoda). ZooKeys 775: 131-147. https://doi.org/10.3897/zookeys.775.25740
Figure 5 Bayesian 50% majority-rule consensus tree based on the analysis of concatenated partial COI and 16S sequences showing the relationships among Tunisian and Italian Marmorana (Murella) muralis samples.
Figure 2 from: Ezzine IK, Dimassi N, Pfarrer B, Said K, Neubert E (2018) New records of the endemic Sicilian land snail species Marmorana (Murella) muralis (O. F. Müller, 1774) from the north of Tunisia (Pulmonata, Gastropoda). ZooKeys 775: 131-147. https://doi.org/10.3897/zookeys.775.25740
Figure 2 Anatomy of genital organs of Marmorana (Murella) muralis (Müller, 1774). A Situs B Details of dart sac C Details of epiphallus D Penial papilla. Abbreviations: A. atrium, Bc. Bursa copulatrix, D. Diverticulum, Ds. Dart sac, E. Epiphallus, F. Flagellum, Gm. Glandulae mucosae, mrp. Penial retractor muscle, P. Penis, Vd. Vas deferens.
Figure 1 from: Ezzine IK, Dimassi N, Pfarrer B, Said K, Neubert E (2018) New records of the endemic Sicilian land snail species Marmorana (Murella) muralis (O. F. Müller, 1774) from the north of Tunisia (Pulmonata, Gastropoda). ZooKeys 775: 131-147. https://doi.org/10.3897/zookeys.775.25740
Figure 1 Marmorana (Murella) muralis (O. F. Müller, 1774) and Murella nicollei Pallary, 1926. A Menzel Jemil, Bizerte, 17.ii.2015, NMBE 534231, leg. Ezzine, D = 16.79 mm B Kelibiya, 10.i.2016, NMBE 551457, leg. Ezzine, D = 16.98 mm. Photographs Bochud & Ezzine C Murella nicollei, Tabarka. Scale bar: D 15.5 mm (copy of the original publication).
Figure 4 from: Ezzine IK, Dimassi N, Pfarrer B, Said K, Neubert E (2018) New records of the endemic Sicilian land snail species Marmorana (Murella) muralis (O. F. Müller, 1774) from the north of Tunisia (Pulmonata, Gastropoda). ZooKeys 775: 131-147. https://doi.org/10.3897/zookeys.775.25740
Figure 4 Haplotype network showing the relationships among Italian and Tunisian specimens of M. (M.) muralis. A Haplotype network based on partial COI sequences B Haplotype network based on partial 16S sequences C Haplotype network based on concatenated partial COI and 16S sequences.
Data from: A question of time: the land snail Murella muralis (Gastropoda: Pulmonata) reveals constrains to past ecological speciation
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Figure 3 from: Ezzine IK, Dimassi N, Pfarrer B, Said K, Neubert E (2018) New records of the endemic Sicilian land snail species Marmorana (Murella) muralis (O. F. Müller, 1774) from the north of Tunisia (Pulmonata, Gastropoda). ZooKeys 775: 131-147. https://doi.org/10.3897/zookeys.775.25740
Figure 3 Localisation of Tunisian and Italian specimens used in the study.
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