|A live Littorina angulifera|
Littorina angulifera (Lamarck, 1822)
The maximum recorded shell length is 41 mm. The shell usually has six whorls, the large first one occupying half the length of the snail. The color varies from slaty-brown through reddish brown to orange, dull yellow and off white. The smaller whorls have white spots near their edges and also some darker streaks which fuse together on the largest whorl.
Distribution and habitat
This species occurs in the Caribbean Sea and the western Atlantic Ocean from Florida south to Brazil. It is also found in the eastern Atlantic between Senegal and Angola.  It lives mainly above sea level on the branches and prop roots of the red mangrove (Rhizophora mangle).
Littoraria angulifera is ovoviviparous. Fertilized eggs are brooded inside the periwinkle and the veliger larvae are then released and become planktonic. After about 9 weeks these develop into pediveliger larvae which undergo metamorphosis and settle.
- Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. doi:10.1371/journal.pone.0008776.
- Littorina angulifera: Mangrove periwinkle Smithsonian Marine Station. Retrieved 2011-12-02.
- Alves R. R. N. (2009). "Fauna used in popular medicine in Northeast Brazil". Journal of Ethnobiology and Ethnomedicine 5: 1. doi:10.1186/1746-4269-5-1.