Tall Top Shell – Tectus triserialis

The Tall Top Shell, scientifically known as Tectus triserialis, is a marine gastropod mollusk characterized by its striking conical shell. This species exhibits a unique and fascinating combination of adaptations that allow it to thrive in its chosen habitats.

Description & Characteristics

The Tectus triserialis is easily recognized by its tall, conical shell, which can reach a maximum size of around 80 mm in length. The shell is typically a reddish-brown color, often with darker brown or black markings. It has a distinct spiral pattern with multiple rows of nodules or bumps that are often prominent along the whorls. The aperture, or opening of the shell, is relatively small and rounded, with a slightly flared outer lip.

Habitat and Occurrence

The Tall Top Shell is a common inhabitant of various marine zones, specifically the subtidal, sublittoral, infralittoral, and deeper zones of the oceans from the lower limit of the intertidal zone to the shelf edge at about 200 m water depth. This species is classified as neritic, meaning it lives in waters over the continental shelf. Its broad distribution across these marine zones allows it to exploit a diverse range of habitats and resources.

Taxonomy

The Tall Top Shell, Tectus triserialis, belongs to the Class: Gastropoda, which includes a vast array of snails and slugs. It is further classified within the Order: Trochida, a group of marine snails known for their distinctive coiled shells. Finally, it is part of the Family: Tegulidae, which encompasses a variety of top shells that share common characteristics like their conical shape and distinctive ornamentation.

Feeding

The Tectus triserialis is an herbivorous gastropod, primarily feeding on a diet of algae. It is known to graze on epiphytes, which are plants that grow on other plants, and diatoms, a type of single-celled algae. This species also consumes detritus, which is organic matter that has been broken down and decomposing. This flexible diet allows the Tall Top Shell to thrive in a variety of marine environments.