Naria spurca
A variable cowry found in the Mediterranean and eastern Atlantic.
Naria spurca, called the dirty cowry, is a marine gastropod mollusk in the cowry family Cypraeidae. Its shell, which is smooth and glossy, ranges from 12 to 39 mm in length, averaging 23–28 mm. The shell’s pattern and color vary greatly: the dorsum is whitish or yellowish with indistinct spotting in orange-brown, yellow ocher, or reddish tones. The yellowish edges are crenulated or lined with dimples. The base is whitish or cream, sometimes with orange shades and dark spots near the rim, and the teeth are usually large and white. In living animals, the mantle is grayish with long, tree-shaped sensory papillae.
This species is found in the central and southern Mediterranean Sea (including southern Italy, Crete, Malta, and Lampedusa Island), has been introduced to the Red Sea, and also occurs in the eastern Atlantic along the West African coast from Morocco to Angola, including Ascension Island, the Canaries, and Cape Verde Islands. It typically lives at depths of 2 to 20 meters, but can be found as deep as 50 meters. During the day, it hides under rocks, in crevices, or in meadows of *Posidonia oceanica*, emerging to feed at dusk.
Three subspecies are recognized: *Naria spurca sanctaehelenae*, *Naria spurca spurca*, and *Naria spurca verdensium*.
Quick Facts
- Taxon
- Naria spurca
Facts from the source article.
Lore & Background
The shells of Naria spurca reach an average length of 23 to 28 mm, with extremes from 12 mm to 39 mm. The surface is smooth and shiny; the dorsum is whitish or yellowish with variegated orange-brown, yellow ocher, or reddish indistinct spotting. The yellowish margins are crenulated or bordered by a series of dimples. The base is whitish or cream, sometimes with orange shades and dark spots near the edge, and the teeth are usually large and white. In living specimens, the mantle is greyish with quite long tree-shaped sensorial papillae.
This species occurs in the central and southern Mediterranean Sea (including southern Italy, Crete, Malta, and Lampedusa Island), in the Red Sea (introduced), and in the eastern Atlantic along the West African coast from Morocco to Angola, including Ascension Island, the Canaries, and Cape Verde Islands. It commonly lives at depths of 2 to 20 m, but can be found down to 50 m. During the day it hides under rocks, in crevices, or in meadows of Posidonia oceanica, feeding at dusk.
Reader's Guide
Naria spurca is a widely distributed and common cowry, recognized for its remarkable variability in shell pattern and color. Its presence across the Mediterranean, Red Sea, and eastern Atlantic reflects a broad ecological tolerance, from shallow seagrass beds to deeper rocky crevices. The species' ability to hide under rocks and in Posidonia meadows during the day, emerging at dusk to feed, illustrates its adaptation to coastal environments. The three recognized subspecies—Naria spurca sanctaehelenae, Naria spurca spurca, and Naria spurca verdensium—further indicate geographic variation within the species. Its smooth, shiny shell with crenulated margins and distinctive spotting makes it a familiar find for shell collectors in its range. The introduction into the Red Sea highlights its capacity to establish in new regions. Overall, Naria spurca represents a typical yet variable member of the cowry family, well adapted to Mediterranean and Atlantic coastal habitats.
Did You Know?
- The shell length ranges from 12 mm to 39 mm.
- Living cowries have a greyish mantle with tree-shaped sensorial papillae.
- It is found from Morocco to Angola in the eastern Atlantic.
- During the day it hides under rocks or in Posidonia oceanica meadows.
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