The Planaxidae Family includes 57 species comprising 2 subfamilies (Planaxinae (7 genus), Fossarinae (4))
and 11 genus (Fossarus (25 species), Hinea (11), Supplanaxis (8), Planaxis (4), Larinopsis (2), Holcostoma (2), ...)

Phylum      : Mollusca
 Class       : ⤷Gastropoda 
  Subclass    : ⤷Caenogastropoda 
   Order       : ⤷Caenogastropoda incertae sedis 
    Superfamily : ⤷Cerithioidea 
     Family      : ⤷Planaxidae

Common name : planaxid or clusterwink

Aspect : thick, solid, and conical to ovate, often 1–3 cm in height, with a heavy periostracum; prominent axial and spiral ribs, cords, or strong squarish spiraling cords; wide aperture with a short broad anterior canal/notch; inner lip often white, sometimes lirate or denticulate; outer lip thickened, grooved, or scalloped; colors vary from dark brown/black with white spiral spots/bands (Planaxis), light tan/brown (Fissilabia), or glossy white with brown bands (Angiola); horny operculum

Feeding : microphagous herbivores

Environment : tropical, subtropical, or mid-tropical zone in intertidal rocky shores on hard substrates like rocks, boulders, seawalls, and beachrock