tertsiinids

Tertiinids are a family of marine gastropod mollusks. They are commonly known as the auger shells or auger snails due to their elongated, spirally coiled shells which resemble an auger or drill bit. This characteristic shape is a defining feature of the family.

The shells of tertiinids are typically slender and turret-shaped, with numerous whorls that are often deeply separated. The aperture, or opening of the shell, is usually narrow and elongated. The exterior of the shell can vary in color and texture, often exhibiting patterns of lines, dots, or spirals.

Tertiinids are found in marine environments worldwide, inhabiting a range of habitats from shallow sandy bottoms to deeper reefs. They are predatory gastropods, feeding on other invertebrates, particularly polychaete worms. Their long, slender proboscis is adapted for probing into the burrows of their prey.

Reproduction in tertiinids typically involves internal fertilization and the laying of egg capsules. The larval stage is planktonic, allowing for dispersal to new areas. As a group, tertiinids are an important component of marine benthic ecosystems, playing a role in controlling populations of their prey.