Why these air-breathing land snails are the most famous mollusks in the world

Nature · Published 3 October 2026 Swipe more like this →

In short: Known as typical snails, the Helicidae family dominates European landscapes and culinary traditions. These air-breathing gastropods are far more than just garden pests or escargot ingredients; they possess complex reproductive anatomy, including love darts, and have successfully colonized diverse environments across the globe through both natural migration and human introduction.

The Helicidae family represents a diverse group of air-breathing land snails, often referred to as typical snails. While their core distribution stretches from the Caucasus region, through Turkey and Europe, and down into North Africa, their reach is truly global. Certain species, such as Cornu aspersum and Theba pisana, have established themselves far beyond their ancestral ranges, becoming invasive in various parts of the world. Others, like Cepaea hortensis, have even reached as far as Iceland and parts of eastern Canada.

Biologically, these snails are defined by specialized reproductive features. They are hermaphroditic, possessing both male and female organs, and are equipped with a unique dart sac and associated mucous glands. In many species, this system includes a love dart—a structure used during mating that varies in blade count depending on the specific lineage. Their shells, which are typically flattened or globular, serve as a primary identifier, though some species exhibit striking, colorful patterns that distinguish them from their more muted relatives.

Modern science is currently deepening our understanding of these mollusks through molecular phylogenetics and genomics. Researchers have identified three distinct subfamilies, with recent studies in 2022 refining the classification of tribes like Thebini and Maculariini. Furthermore, the Darwin Tree of Life project is working to sequence the genomes of several key species, including Arianta arbustorum and Cepaea nemoralis. By examining their chromosomal structure—which typically ranges from 22 to 30 haploid chromosomes—scientists hope to better understand the evolutionary history of these resilient, lung-breathing creatures.

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