   murex is a genus of medium to large sized predatory tropical sea snails. these are carnivorous marine gastropod molluscs in the family muricidae, commonly called "murexes" or "rock snails".houart, r.; gofas, s. (2010). murex linnaeus, 1758. in: bouchet, p.; gofas, s.; rosenberg, g. (2010) world marine mollusca database. accessed through: world register of marine species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138196 on 2011-04-09 the common name murex is still used for a large number of species in the family muricidae which were originally given the latin generic name murex in the past, but have more recently been regrouped into different newer genera. the word murex was used by aristotle in reference to these kinds of snails, thus making it one of the oldest classical seashell names still in use by the scientific community. ==distribution== murex is solely an indo-pacific genus, as demonstrated by ponder & vokes (1988). the species from the western atlantic that were formerly considered to belong in the genus murex are now placed in the genus haustellum. ==habitat== most murex species live in the intertidal or shallow subtidal zone, among rocks and corals. ==shell description== this genus includes many showy members, their elongate shells highly sculptured with spines or fronds. the inner surfaces of their ornate shells are often brightly colored. ==human use== costly and labor-intensive dyes tyrian purple (or royal purple) and tekhelet were historically made by the ancient phoenicians using mucus from the hypobranchial gland of two species commonly referred to as "murex", murex brandaris and murex trunculus, which are the older names for haustellum brandaris and the hexaplex trunculus. this dye is a rare animal-produced organobromine compound, which the snails make using a specific bromoperoxidase enzyme that operates 
Muricidae