Back to Search
Start Over
Systematics and geographical distribution of Galba species, a group of cryptic and worldwide freshwater snails
- Source :
- Molecular Phylogenetics and Evolution, Molecular Phylogenetics and Evolution, Elsevier, 2021, 157, pp.107035. ⟨10.1016/j.ympev.2020.107035⟩, Molecular Phylogenetics and Evolution, 2020, 157, pp.107035. ⟨10.1016/j.ympev.2020.107035⟩
- Publication Year :
- 2021
- Publisher :
- HAL CCSD, 2021.
-
Abstract
- Cryptic species can present a significant challenge to the application of systematic and biogeographic principles, especially if they are invasive or transmit parasites or pathogens. Detecting cryptic species requires a pluralistic approach in which molecular markers facilitate the detection of coherent taxonomic units that can then be analyzed using various traits (e.g., internal morphology) and crosses. In asexual or self-fertilizing species, the latter criteria are of limited use. We studied a group of cryptic freshwater snails (genusGalba)from the family Lymnaeidae that have invaded almost all continents, reproducing mainly by self-fertilization and transmitting liver flukes to humans and livestock. We aim to clarify the systematics, distribution and phylogenetic relationships of these species with an integrative approach that includes morphology (shell and reproductive anatomy), molecular markers, wide-scale sampling across America, and data retrieved from GenBank (to include Old World samples). Our phylogenetic analysis suggests that the genusGalbaoriginated ca. 22 Myr ago and today comprises six clusters of species. Four of these clusters (G.truncatula,G.cubensis/viator,G.humilisandG.schirazensis) are morphologically cryptic and constitute species or species complexes with wide variation in their genetic diversity, geographic distribution and invasiveness. The other two clusters constitute a single species or a species complex (Galba cousini/meridensis) that demonstrate more geographically restricted distributions and exhibit an alternative morphology more phylogenetically derived than the cryptic one. Further genetic studies are required to clarify the status of bothG. cousini/meridensisandG.cubensis/viator. We emphasize that noGalbaspecies should be identified without molecular markers and that additional sampling is required, especially in North America, Eurasia and Africa to clarify remaining questions in systematics and biogeography. We also discuss several hypotheses that can explain crypsis inGalba, such as convergence and morphological stasis, and hypothesize a role for stabilizing selection in amphibious (rather than strictly freshwater) habitats.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Systematics
Species complex
Time Factors
Biogeography
Snails
Fresh Water
Morphology (biology)
America
Self-fertilization
[SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy
010603 evolutionary biology
01 natural sciences
Lymnaeidae
03 medical and health sciences
Species Specificity
Genus
Phylogenetics
Genetics
Animals
Biological invasions
Galba cousini
Molecular Biology
Phylogeny
Ecology, Evolution, Behavior and Systematics
030304 developmental biology
0303 health sciences
Genetic diversity
Geography
Phylogenetic tree
biology
biology.organism_classification
[SDV.BA.ZI]Life Sciences [q-bio]/Animal biology/Invertebrate Zoology
Phenotype
030104 developmental biology
Galba
Evolutionary biology
Calibration
Vector snails
Microsatellite Repeats
Subjects
Details
- Language :
- English
- ISSN :
- 10557903 and 10959513
- Database :
- OpenAIRE
- Journal :
- Molecular Phylogenetics and Evolution, Molecular Phylogenetics and Evolution, Elsevier, 2021, 157, pp.107035. ⟨10.1016/j.ympev.2020.107035⟩, Molecular Phylogenetics and Evolution, 2020, 157, pp.107035. ⟨10.1016/j.ympev.2020.107035⟩
- Accession number :
- edsair.doi.dedup.....4415020851c80320884707c704da9a1e