title: Planaxis sulcatus
text: # Planaxis sulcatus
  
  Planaxis sulcatus, common name the tropical periwinkle, is a species of sea snail, a marine gastropod mollusk in the family Planaxidae.
  
  ## Distribution
  
  This marine species occurs in the Red Sea and in the Indian Ocean off Mozambique, Kenya, Madagascar, Tanzania and off Mauritius, Chagos, Aldabra and the Mascarene Basin. It is also found off the Pakistani coast, specially Sonmiani Bay (Miani hor).
  
  ## Description
  
  The size of the shell varies between 13 mm and 35 mm.
  
  ## Ecology
  
  Parasites of Planaxis sulcatus include trematode Lobatostoma manteri.
  
  