The Littorinidae Family includes 222 species comprising 3 subfamilies (Littorininae (11 genus), Lacuninae (5), Laevilitorininae (2))
and 18 genus (Echinolittorina (62 species), Littoraria (38), Lacuna (24), ...)

Phylum      : Mollusca
 Class       : Gastropoda 
  Subclass    : Caenogastropoda 
   Order       : Littorinimorpha 
    Superfamily : Littorinoidea 
     Family      : Littorinidae

Common name : periwinkles

Aspect : fairly small shell, not pearly, variable size and thickness depending on the region. Fine and sharp external lip. Horny and spiral, very tight seal allowing them to wait dry for several days for the return of high tides.

Feeding : herbivore

Environment : rocky shores in almost all parts of the world

Littoraria coccinea glabrata (Philippi, 1846) (Subfamily Littorininae)