Tibia fusus (Linnaeus, 1758) is a species of medium-sized sea snail, a marine gastropod mollusc in the family Rostellariidae, which is closely related to the Strombidae (true conchs). It is commonly known as the Spindle Tibia or Fused Spindle.
Taxonomy
- Tibia fusus was first described by Carl Linnaeus in 1758 under the basionym Murex fusus. It was later reclassified into the genus Tibia. The genus Tibia belongs to the family Rostellariidae, which itself has historically been treated as a subfamily (Rostellariinae) within Strombidae or as a distinct family. Current taxonomic understanding often recognizes Rostellariidae as a distinct family within the superfamily Stromboidea.
- Kingdom: Animalia
- Phylum: Mollusca
- Class: Gastropoda
- Subclass: Caenogastropoda
- Order: Littorinimorpha
- Superfamily: Stromboidea
- Family: Rostellariidae
- Genus: Tibia
- Species: T. fusus
Description
- The shell of Tibia fusus is distinctive, characterized by its elongated, slender, and spindle-shaped form, tapering significantly at both ends. It can grow to a considerable size, typically ranging from 15 to 25 cm (6 to 10 inches) in length, though larger specimens are known.
- The spire is tall and acute, comprising numerous whorls. The body whorl is smooth or may exhibit fine spiral lines.
- A prominent feature is its exceptionally long and narrow siphonal canal, which can be nearly as long as the spire itself. The aperture is narrow and elongated.
- The columella (inner lip) often bears a series of plicae (folds or ridges), especially towards the posterior end. The outer lip is usually simple and thin in mature specimens, without the strong digital processes seen in some related genera.
- The shell color is typically pale, ranging from creamy white to light yellowish-brown, sometimes with faint spiral banding. The operculum is corneous and ungulate (claw-shaped).
Distribution and Habitat
- Tibia fusus is native to the Indo-Pacific region. Its geographical range extends across tropical waters, including areas such as the Philippines, Indonesia, Malaysia, and other parts of Southeast Asia.
- It typically inhabits subtidal environments, preferring sandy or muddy bottoms at depths ranging from shallow waters to over 100 meters (330 feet). They are often found partially buried in the substrate, using their long siphonal canal to draw water for respiration and feeding.
Ecology
- Like other members of the Stromboidea, Tibia fusus is believed to be a herbivore or detritivore, feeding on algae and organic matter found in the sediment.
- Its long siphonal canal is an adaptation for life partially buried in sand, allowing it to maintain water flow for respiration and chemoreception while remaining hidden from predators.
- The species is collected for its attractive shell, particularly by shell collectors, but is not generally considered endangered.
References
- World Register of Marine Species (WoRMS)
- Gastropods.com
- Linnaeus, C. (1758). Systema Naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Editio decima, reformata. Holmiae. (Salvius).