Phalium areola

Phalium areola, common name the checkerboard bonnet, is a species of sea snail, a marine gastropod mollusc in the subfamily Cassinae, within the family Cassidae the helmet and bonnet shells. It is also known as the checkerboard bonnet shell.^[1]

An apertural view of a shell of Phalium areola

Phalium areola
Shell of Phalium areola
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Cassidae
Genus:	Phalium
Species:	P. areola
Binomial name
Phalium areola (Linnaeus, 1758)
Synonyms[1]
Cassis alea Röding, P.F., 1798 Cassis areola (Linnaeus, 1758) Phalium agnitum Iredale, T., 1927 Phalium areolata Schumacher, H.C.F., 1817 Phalium clathratum Link, H.F., 1807 Phalium extinctum Link, H.F., 1807 Phalium sulcatum Link, H.F., 1807

Distribution

This species occurs in the Indian Ocean along Madagascar, the Mascarene Basin, Tanzania and off the southern African coast from KwaZulu-Natal and Mozambique.^[2] It can also be found in Melanesia and along Samoa.^[3][4]

Description

The size of an adult shell varies between 35 mm and 130 mm.^[3] These medium-sized shells are oval and acuminate, with a rather narrow mouth, the outer lip folded back and internally denticulate. Shoulder are not angulate nor plicate and the anterior prickles on outer lip obsolete. The surface of the shell is white with five series of large squarish red-brown spots (hence the common name). Later whorls show spiral striae anteriorly on whorls and above shoulders.^[5][6]