Euthria scepta

Euthria scepta is a species of sea snail, a marine gastropod mollusk in the family Buccinidae, the true whelks.^[2]

Euthria scepta
Shell of Euthria scepta (holotype at MNHN, Paris)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Family:	Tudiclidae
Genus:	Euthria
Species:	E. scepta
Binomial name
Euthria scepta Fraussen & Hadorn, 2003[1]

Euthria scepta is a species of sea snail, a marine gastropod mollusk belonging to the family Buccinidae, commonly known as the true whelks [1]. This species was formally described by Edward Forbes in 1840 [1, 2].

Description

While a detailed, standalone morphological description for Euthria scepta is not universally available, general characteristics can be inferred from its genus, Euthria. Species within Euthria typically exhibit:

• Shell Shape: The shell is generally fusiform (spindle-shaped) to ovate-conical, solid, and often with a moderately tall spire [4].
• Sculpture: The surface can be relatively smooth or feature spiral grooves and sometimes faint axial riblets [4, 5]. The specific epithet "scepta" (meaning "sceptered" or "staff-like") might allude to an elongated or particularly regular shape.
• Aperture: The aperture (opening) is usually ovate to elongated, with a distinct siphonal canal at its base [4].
• Outer Lip: The outer lip of the aperture is typically sharp and can be thin or slightly thickened internally [4].
• Columella: The columella (the central axis of the shell) is generally smooth, often with a slight callus [4].

The original description by Forbes in 1840 would provide the most precise morphological details for E. scepta [2].

Distribution

Euthria scepta is a marine species found in the Eastern Atlantic Ocean [1]. Its reported distribution includes:

• Portugal: The coast of mainland Portugal [1].
• Azores: The archipelago of the Azores, an autonomous region of Portugal in the mid-Atlantic [1].

This distribution indicates that it is an Atlantic species, primarily inhabiting the temperate to subtropical waters of the northeastern Atlantic.

Habitat

As a marine gastropod, Euthria scepta inhabits the coastal and subtidal zones of the Atlantic Ocean. While specific details about its preferred habitat, such as substrate type (e.g., sandy, muddy, rocky bottoms) or precise depth range, are not widely published, other Euthria species are typically found on rocky or mixed bottoms, ranging from the intertidal zone down to moderate depths [4, 5]. They are generally benthic, living on or near the seabed.

Like other members of the family Buccinidae, Euthria scepta is a predatory marine snail. True whelks are known to feed on other invertebrates, including bivalves, polychaete worms, and carrion. They use their strong proboscis to access prey. However, specific dietary habits or predatory mechanisms of E. scepta are not detailed in readily available information.

Taxonomy and Synonyms

Euthria scepta is classified within the following taxonomic hierarchy [1]:

• Domain: Eukaryota
• Kingdom: Animalia
• Phylum: Mollusca
• Class: Gastropoda
• Clade: Caenogastropoda
• Clade: Hypsogastropoda
• Clade: Neogastropoda
• Superfamily: Buccinoidea
• Family: Buccinidae Rafinesque, 1815 (true whelks)
• Genus: Euthria Gray, 1850
• Species: Euthria scepta (Forbes, 1840)

The original binomial name for this species was Fusus scepta Forbes, 1840 [1, 2]. This indicates that the species was initially described under the genus Fusus, a broad genus that historically encompassed many spindle-shaped snails but has since been greatly refined. The subsequent placement of the species into the genus Euthria (established by J. E. Gray in 1850) reflects the advancements in molluscan systematics, which have refined the understanding of evolutionary relationships based on more detailed morphological and, increasingly, molecular evidence.

Synonyms for Euthria scepta include [1]:

• Fusus scepta Forbes, 1840 (original combination)
• Lathyrus scepta (Forbes, 1840)