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22 staircase shells species
Architectonica nobilis
Heliacus bisulcatus
Heliacus cylindricus
Psilaxis krebsii
Spirolaxis centrifuga
Heliacus mazatlanicus
Heliacus implexus
Architectonica perspectiva
Heliacus infundibuliformis
Heliacus variegatus
Philippia hybrida
Heliacus trochoides
Architectonica gualtierii
Discotectonica discus
Pseudotorinia architae
Solatisonax sigsbeei
Psilaxis oxytropis
Psilaxis radiatus
Spirolaxis rotulacatharinea
Heliacus areola
Heliacus mighelsi
Heliacus sterkii
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