Angular Triton or Rock Shell (alternate: Chestnut Latiaxis)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Muricidae, Genus: Coralliophila, Species: Coralliophila neritoidea · Muricidae (Murex and Rock Shell family) · Gastropod (univalve), whole shell, roughly biconical to angular spiral shape
Species
Coralliophila neritoidea or related Magilidae species
Shell Type
Gastropod (univalve), whole shell, roughly biconical to angular spiral shape
Family
Muricidae (Murex and Rock Shell family)
Size
Approximately 1 to 1.5 inches in length. This is an average size for the species, which typically ranges from 0.8 to 2 inches.
Color & Pattern
Base color of chalky white highlighted with warm chestnut brown or peach patches, particularly aligned along the spiral cords and axial ridges. The surface is mostly natural with crisp coloration, showing no signs of severe bleaching.
Rarity
Uncommon to Common depending on the specific reef region; finding a well-preserved, intact specimen on a tourist beach requires some dedicated searching.
Habitat
Shallow tropical and subtropical waters, typically found associated with living or dead coral reefs, rocky substrates, and areas rich in cnidarian hosts from the intertidal zone down to moderate depths.
Geographic Range
Indo-Pacific region, including the Red Sea, East Africa, Indian Ocean, and across to tropical Australasia and the Central Pacific.
Description
A compact, highly sculptured marine snail shell featuring a distinctive angular shoulder, sharp nodes or spines along the periphery, and prominent spiral cords crossed by fine growth lines. The spire is moderately elevated and sharply pointed, leading to a moderately sized aperture.
Key Features
Strongly angular whorls, prominent nodulous or spinose shoulder keels, rough spiral sculpture, and a short anterior canal typical of coral-dwelling rock shells.
Collector Value
Low to moderate commercial value, widely appreciated by reef-shell collectors and local shell enthusiasts. Usually valued as an attractive, interesting addition to a specialized Muricidae or coral-associated shell collection.
Condition Notes
Good to Fine condition. The shell is structurally intact with well-defined sculpture and good color retention. Minor wear on the apex, but overall a solid specimen with sharp spines and clean aperture edge.
Interesting Facts
Many species within this family are specialized predators or ectoparasites of corals, using a specialized proboscis to feed on the coral polyps beneath them.
Ecological Role
Functions primarily as a coral predator or associate within reef ecosystems. They play a niche role in the reef food web, though heavy population densities can sometimes impact coral health.
Similar Species
Other Coralliophila species and certain small Thais or Muricopsis species, distinguished primarily by closer examination of the aperture, columella smoothness, and exact spine or cord arrangement.
Beach Finding Tips
Look near rocky reef outcrops, coral rubble zones, or driftlines on tropical beaches following high winds or storms that dislodge shells from nearshore reefs.