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Updated 3/1/2026

Family Architectonicidae

Sundials

Sundials are uncommon, associated with corals, anemones, and zoanthids upon which they feed.  They nestle among zoanthid columns or emerge from sediment 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

GUALTIERI'S SUNDIAL