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Home > Invertebrates
> Shells > Sundials
Updated 3/1/2026
Family
Architectonicidae
Sundials
| Sundials are uncommon, associated with corals, anemones, and zoanthids upon which they
feed. They have a hollow ventral space called the umbilicus which
may extend to the apex. Sundials emerge at night from sand or
between zoanthid polyps to feed. |
HAWAII - ENDEMIC
| Heliacus
mighelsi
MIGHEL'S SUNDIAL |
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INDO-PACIFIC / HAWAII
| Heliacus trochoides
TOP SUNDIAL |
Heliacus
areola
AREOLA SUNDIAL
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| Psilaxis
oxytropis
OXYTROPIS
SUNDIAL
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Psilaxis
radiatus
RADIAL
SUNDIAL
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Architectonica perspectiva
PERSPECTIVE
SUNDIAL
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Architectonica gualtierii
GUALTIERI'S
SUNDIAL
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