Jeweled Top Snail: A Guide to This Unique and Beautiful Species

Jeweled Top Snail

The Jeweled Top Snail is a fascinating sea snail found in various parts of the world, including the Kelp Forest on Monterey Bay. Belonging to the family Trochidae, these snails are known for their intricate shell patterns and shiny, pearly luster concealed by a thin layer of shell. With a widespread preference for limestone reefs and rocky dwellings, these intriguing creatures offer fascinating insights into the marine ecosystems they inhabit.

Feeding on algae, these herbivorous snails play an important role in maintaining the balance of their ecosystems. Female Jeweled Top Snails tend to be larger than their male counterparts, and their attractive shells make them stand out among other invertebrates. Their presence in certain areas, such as the Miocene rock formations in Orange County or the Spindrift Site in La Jolla, California, highlights their importance to the field of marine research and conservation.

Jeweled Top Snail Overview

Physical Appearance

The Jeweled Top Snail is a beautiful and unique species of gastropod that belongs to the family Trochidae. Its shell is conical in shape, featuring vibrant colors and intricate patterns, often resembling a jewel or gemstone. The shell’s surface is adorned with spiral cords and beaded ornamentation, giving the snail a distinct appearance that sets it apart from other snails in its family. Adult shells possess three large flat spiral cords and one narrow one, while the early whorls exhibit a beaded spiral cord at the suture and two smooth spiral cords.

This snail is one our 11 most beautiful snails list.


The habitat of the Jeweled Top Snail is typically found in limestone or rocky areas, particularly on intertidal reefs. Studies, such as the one conducted in Ngari Capes Marine Park in south-western Australia, reveals a significant association between geology and the presence of Jeweled Top Snails and other species in the area. Their preference for limestone and rocky habitats allows them to thrive in these locations, contributing to a diverse ecosystem of plants, algae, and other invertebrates.

    Ecology and Behavior

    Feeding Habits

    As their habitat is found near the shoreline, they mainly feed on algae and organic detritus. They exhibit a grazing behavior and have a preference for the microalgae and diatoms that grow on rocks or other hard surfaces. While foraging, Jeweled Top Snails use their radula, which is a specialized feeding structure, to scrape off algae from the surfaces. This feeding behavior helps maintain a healthy balance of algae populations and prevents overgrowth, thus contributing to the overall health of the ecosystem.


    Jeweled Top Snails reproduce through broadcast spawning, where male and female snails release their gametes into the water column simultaneously. Once fertilized, the eggs develop into free-swimming larvae. This larval stage lasts for several weeks, during which the larvae feed on plankton and move with the ocean currents. Over time, they undergo a process called metamorphosis, where they transform into juvenile snails and settle on the substrate.

    The reproductive success of Jeweled Top Snails depends on various factors such as the availability of food sources, suitable habitat, and the presence of potential predators. Additionally, environmental factors like water temperature, salinity, and current patterns can impact their development and distribution.

    Conservation and Threats

    Endangered Status

    The Jeweled Top Snail (Calliostoma annulatum) is not currently listed as an endangered species. However, there are concerns regarding the overall well-being of the snail due to various environmental and human-related factors.

    Human Impact

    The primary threats to the Jeweled Top Snail population can be attributed to human activities, climate change, and predation. Some of the main concerns include:

    • Habitat loss: Coastal development and human activities have led to the loss of suitable habitat for the Jeweled Top Snail, as mentioned in the study on Ngari Capes Marine Park. Destruction of intertidal reefs may negatively affect both the algae cover and the invertebrate species composition in the ecosystem, including Jeweled Top Snails.
    • Climate change: Rising ocean temperatures and altering sea levels can pose a threat to the survival and distribution of snails in the intertidal zone. Changes in ocean currents can also impact their movement, as it can affect the availability of their prey.
    • Pollution: Water pollution, including oil spills, plastic waste, and chemical runoffs, can have a detrimental effect on the health and survival of marine species, including the Jeweled Top Snail.
    • Predation: Jeweled Top Snails are a natural part of the marine food chain and may be preyed upon by various marine animals, such as fish, sea stars, and crabs. An increase in predators’ populations can result in a decline in Jeweled Top Snail populations.
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