Purpura (gastropod)
A genus of sea snails known for producing a dull crimson dye.
Purpura is a genus of marine snails, specifically gastropod mollusks, belonging to the subfamily Rapaninae within the family Muricidae—commonly known as murex or rock snails. This genus should not be confused with the name *Purpura* Jousseaume, 1880, which is actually a synonym for *Bolinus* Pusch, 1837. Members of *Purpura* have large shells with wide openings, a concave columella, and no outer calcitic layer; their rachidian teeth feature prominent marginal denticles. The shell itself is oblong-oval with a large body whorl and a short spire. The aperture is ovate and large, with an oblique groove or channel at the front. The columella is flattened, and the outer lip is simple. These snails and their close relatives live in both temperate and tropical seas. Many species produce a fluid that yields a dull crimson dye, which is why they are called purple shells. Their egg-cases are membranous, oval or spheroidal, sometimes found singly and sometimes grouped in masses; each sac contains many embryos. Recognized species include *Purpura bufo*, *Purpura panama*, *Purpura persica*, and the extinct *Purpura angsanana* and *Purpura dijki*. Over time, hundreds of species were once placed in this genus but have since been reassigned. For example, *Purpura hippocastanum* is now *Thais (Thalessa) virgata*, *Purpura hystrix* is *Drupa (Drupa) ricinus*, *Purpura lapillus* is *Nucella lapillus*, *Purpura mancinella* is *Thais (Mancinella) alouina*, *Purpura nassoidea* and *Purpura nassoides* are both *Oppomorus noduliferus*, and *Purpura rudolphi* is a synonym of *Purpura persica*.
Quick Facts
- Taxon
- Purpura
- Type Species
- Buccinum persicum / Linnaeus, 1758
Facts from the source article.
Lore & Background
The genus Purpura is not to be confused with Purpura Jousseaume, 1880, a synonym of Bolinus Pusch, 1837. The shell is oblong-oval with a large body whorl and a short spire. The aperture is ovate and large, with an oblique channel or groove at the fore part; the columella is flattened, and the outer lip is simple. Many species produce a fluid that yields a dull crimson dye, which gives them their common name of purple shells. Their egg-cases are membranous, oval or spheroidal, sometimes solitary, sometimes united in masses, each sac containing many embryos.
Reader's Guide
The genus Purpura holds significance as a group of predatory marine gastropods within the Muricidae family, inhabiting both temperate and tropical seas. Its members are notable for producing a fluid that yields a dull crimson dye, historically associated with the name 'purple shells.' The genus has undergone extensive taxonomic revision: over time, several hundred species were included in Purpura, but many have since been moved to other genera. For example, Purpura hippocastanum is now a synonym of Thais (Thalessa) virgata; Purpura hystrix is a synonym of Drupa (Drupa) ricinus; Purpura lapillus is a synonym of Nucella lapillus; Purpura mancinella is a synonym of Thais (Mancinella) alouina; Purpura nassoidea and Purpura nassoides are synonyms of Oppomorus noduliferus; and Purpura rudolphi is a synonym of Purpura persica. The remaining accepted species include Purpura bufo, Purpura panama, Purpura persica, and the fossil species † Purpura angsanana and † Purpura dijki. This history reflects the ongoing refinement of muricid taxonomy based on phylogenetic studies.
Did You Know?
- Purpura is a genus of sea snails in the subfamily Rapaninae of the family Muricidae.
- Many Purpura species produce a fluid that gives a dull crimson dye, leading to the name 'purple shells.'
- The genus includes both extant species and fossil species such as † Purpura angsanana and † Purpura dijki.
- Several hundred species were once included in Purpura but have since been moved to other genera.
More in Murex Snails 1-24
Spotted an error? Know more?
Reader corrections go straight into our review queue. Suggest an edit · How this site is sourced