Family Obtortionidae
Finella dubia
(d'Orbigny, 1842)
- 18 mm

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Shell elongate, turreted, small. Spire sides straight. Sculpture of three strong, squarish spiral cords. Interspaces with fine spiral striations and axial threads. Outer lip with crenulations corresponding to spiral sculpture. Anterior canal curved. Color cream to light-brown with faint spots of darker color. The additional image (SEM) shows two juvenile shells from Sanibel beach drift. Observe variation in shell sculpture between these two specimens.