According to a phylogenetic study published on July 26, 2026, in the Zoological Journal of the Linnean Society, researchers analyzed nearly 700 species of marine snails to reconstruct the evolutionary history and single origin of Neogastropoda. Combining global natural history collections with phylogenomic analyses, the international team—including scientists from the Swedish Museum of Natural History—identified four new families, a revised classification, and a previously undetected diversification burst in the early Cenozoic.
Single Origin and Four New Families Identified in Marine Snails
Scientists have established for the first time that all diverse groups within Neogastropoda share a single evolutionary origin, proving that these varied marine snail lineages are direct relatives. According to the study, researchers identified four new families within the group. These findings, alongside a newly proposed classification system, provide a stable framework for future taxonomic research and species descriptions in underexplored marine environments, as noted by the research team.
Early Cenozoic Diversification Boosted by Marine Predators
While the rise of Neogastropoda has long been linked to environmental changes at the end of the Mesozoic Era around the time non-avian dinosaurs declined, a revision of the fossil record uncovered a major diversification burst during the Danian stage of the early Cenozoic. According to the researchers, this burst was likely driven by changes in marine predator communities. As shell-crushing crustaceans and cephalopods emerged, they created a more dangerous environment that exerted selective pressure on neogastropods. This pressure favored animals with novel, shell-resistant architectures, allowing adaptable lineages to survive and evolve into modern-type families.
Did you know? Natural history collections from around the world supplied the critical biological material needed to compare hundreds of small, cryptic marine invertebrate species for this large-scale phylogenomic dataset.
Frequently Asked Questions
What is Neogastropoda?
Neogastropoda is a diverse, species-rich group of marine snails whose evolutionary history and lineage relationships were detailed in a July 2026 study published in the Zoological Journal of the Linnean Society.
What caused the diversification of Neogastropoda in the early Cenozoic?
According to researchers, the diversification was likely spurred by rising selective pressure from shell-crushing predators like early Cenozoic crustaceans and cephalopods, which favored the evolution of more resistant shell architectures.
How many species were included in the study?
The research team assembled a dataset comprising nearly 700 species using global natural history collections and phylogenomic analyses.
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