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Hydatina physis (Linnaeus, 1758)
 
Hydatina physis: laying eggs
 
laying eggs
Photo:  John Hoover: Ilikai, Oahu; April, 1997.

Hydatina physis: probable egg in field
 
probable egg mass in field
one of several large egg masses found anchored in sand or algae; probably laid by this species due to its size but the form doesn't fully rule out H. amplustre

Photo:
  CP: Kahului Harbor, Maui; June 17, 2013.
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