Home > Invertebrates > Shells > Sundials

Updated 12/19/2025

Family Architectonicidae

Sundials

Sundials are rare, associated with corals and anemones upon which they feed at night.

 

HAWAII - ENDEMIC

Heliacus mighelsi

MIGHEL'S SUNDIAL

 

 
 

 

INDO-PACIFIC / HAWAII

Heliacus trochoides

TOP SUNDIAL

 

 Heliacus areola

Variegated Sundial, Oahu

VARIEGATED SUNDIAL

 
Psilaxis oxytropis

OXYTROPIS SUNDIAL

 

 Psilaxis radiatus

RADIAL SUNDIAL

 
Architectonica perspectiva

PERSPECTIVE SUNDIAL

 

 Architectonica gualtierii

MAXIMA SUNDIAL