Helicidae

These are land snails.

They breathe air. Most live in Europe and North Africa. Some live on islands, too.

Their shells come in many shapes. Some are round. Some are flat. Some even look like tubes.

Some snails have bright colors. They have patterns on their shells. People even eat some kinds of snails.

These small animals are all around us.

Helicidae is a large family of land snails.

These snails breathe air. Many live in Europe and North Africa. Some live on islands like the Canary Islands. Other species live in places like Iceland and Canada.

Some snails have moved to new areas around the world.

Their shells come in many shapes. Most shells are flat or shaped like a cone. Some shells are round like a ball. One type has a shell shaped like a tube.

Some snails have shells with bright colors and patterns.

People study these snails closely. Some people even eat them. The brown garden snail is one kind people eat. Another kind is called the escargot.

Scientists look at their tiny parts to tell them apart. They look at the shells and the snail's body. They also look at their genes. These genes are the instructions inside a living thing. They help scientists see how the snails are related.

Helicidae is a huge family of land snails. People often call them the "typical snails." These snails breathe air and live on land. They are medium to large in size. Some of these snails are the largest in Europe. Many species live in places built by humans. Some have even moved to new continents.

Their shells come in many different shapes. Most shells are flat or look like a cone. Some shells are round like a ball. One type of snail has a tube-shaped shell. Some snails have shells with bright colors. They can also have pretty patterns on them.

Scientists study these snails very closely. They look at the snail's body to learn more. They look at parts like the ribbed jaw. They also look at a tiny part called a dart sac. This sac is near special mucous glands. These glands help the snail.

These snails live in many different places. Most live from the Caucasus through Turkey. They also live in Europe and North Africa. Some live on islands like the Canary Islands. One snail lives in Iceland and eastern Canada. Other snails have moved all over the world.

People find these snails very useful. Some species are used as food. The brown garden snail is one example. Another kind is called the escargot. In Italy, you can find snails for sale to eat.

Helicidae is a large and diverse family of air-breathing land snails. Many people refer to these organisms as "typical snails." They are generally medium to large in size. Some species within this group are among the largest land snails found in Europe. These snails are found in many different environments. Some live in habitats created by humans, which are called anthropogenic habitats. Other species have even become invasive on different continents.

The physical appearance of a helicid snail is often defined by its shell. Most shells are either flattened or shaped like a depressed cone. However, several different shapes exist across various genera. For example, the genera Helix, Maltzanella, and Cornu possess globular shells. One specific species, Cylindrus obtusus, is unique because it has a cylindrical shell. Some snails, particularly those in the genus Cepaea, feature shells with bright colors and distinct patterns.

Inside the snail, the anatomy is quite complex and specific. Most helicids possess a ribbed jaw used for feeding. They also have a specialized reproductive structure called a bursa copulatrix, which includes a diverticulum. Another key feature is the dart sac. This sac is usually accompanied by a pair of mucous glands. These glands are typically branched and tubular. They insert themselves at the base of the dart sac.

Scientists use genetics to understand the relationships within this family. In Helicidae, the number of haploid chromosomes ranges between 22 and 30. Researchers are currently working on large-scale genetic studies. A project is scheduled to perform whole genome sequencing and assembly for four specific species. These species are Cepaea nemoralis, Cepaea hortensis, Cornu aspersum, and Arianta arbustorum. This work helps scientists map the entire genetic code of these snails.

The distribution of these snails is very wide. The core area for helicids stretches from the Caucasus through Turkey to Europe and North Africa. Some groups live on islands like the Canary Islands and the Madeira Archipelago. The genus Levantina reaches as far south as western Arabia. One species, Eremina desertella, lives in Sudan, Eritrea, and Puntland in Somalia. Other snails, like Cepaea hortensis, are found in Iceland and eastern Canada.

Helicids are categorized into three main subfamilies based on molecular phylogenetic analyses. The first is Helicinae, which includes the genus Helix. Members of this subfamily may have mucous glands divided into two or more branches. They also possess a love dart with four blades along its length. The second subfamily is Murellinae, which is found in places like Sardinia and Sicily. These snails often have weakly branched mucous glands and one penial papilla. The third subfamily is Ariantinae, which includes the genus Arianta.

Humans have a long history of interacting with these snails. Several species are highly valued as food items. The brown or garden snail, known as Cornu aspersum, is a major example. Another well-known species is Helix pomatia, often called the "escargot." In some regions, such as Italy, these snails are even sold for food.

Understanding Helicidae helps us see how animals adapt to different worlds. Some species stay in their original homes, while others travel far via human activity. Their ability to thrive in human-made spaces shows how resilient they are. By studying their shells, anatomy, and DNA, we learn more about the history of life on Earth. This family remains a vital subject for biological and ecological research.