Trona (gastropod)

Trona is a genus of sea snails, marine gastropod mollusks in the family Cypraeidae, the cowries.

Description:

Trona shells are typically elongated and cylindrical, with a smooth, highly polished surface characteristic of cowries. The aperture (the opening of the shell) is narrow and toothed. The mantle, which is the fleshy outer layer of the snail, extends over the shell in life, keeping it clean and glossy. Colors and patterns can vary among species within the genus.

Distribution:

Trona species are found primarily in the Indo-Pacific region. Their distribution can be patchy, and they are often associated with coral reefs and rocky habitats.

Biology:

Like other cowries, Trona snails are grazing herbivores, feeding on algae and other marine organisms. They are nocturnal, spending the day hidden under rocks or in crevices and emerging at night to feed. They have separate sexes, and fertilization is internal. The female lays egg capsules which she broods until they hatch into free-swimming larvae (veliger).

Taxonomy:

The taxonomy of cowries, including Trona, has undergone revisions. Older classifications may differ from more recent phylogenetic analyses based on molecular data. The placement of species within the Trona genus can be subject to change as new research emerges.

Species:

(A full list of species is beyond the scope of this entry, but some examples include:)

• Trona stercoraria (Linnaeus, 1758) - A relatively common and well-known species.
• (Other species exist, taxonomic databases such as the World Register of Marine Species (WoRMS) should be consulted for a comprehensive list.)

Human Uses:

Cowrie shells, including those of Trona species, have been used for centuries as currency, ornaments, and in traditional medicine in various cultures. Their attractive shells are also collected by shell enthusiasts. However, the collecting of live specimens can negatively impact populations and habitats.