1. Sand Lake, Seminole Co., FL - 58 mm
2. Oklawaha River, Marion Co., FL - 56 mm
3. Wekiva River, Lake/Seminole Co., FL - 45 mm
4. Alexander Spring Creek, Lake Co., FL - 49 mm
Elliptio occulta (Lea, 1843)
1. Sand Lake, Seminole Co., FL - 58 mm
2. Oklawaha River, Marion Co., FL - 56 mm
3. Wekiva River, Lake/Seminole Co., FL - 45 mm
4. Alexander Spring Creek, Lake Co., FL - 49 mm
Type locality: Black Creek, Florida.
Range: Alafia, Oklawaha, St Johns, and Wekiva River systems.
Remarks: This species may be recognized by its compressed shape, winged posterior, sharp posterior ridge, dark posterior slope, polished surface, and (usually) rays. The periostracum may be iridescent in some specimens.
A peculiar color form from Alexander Spring Creek is yellow (#4).
Unio fuscata Lea, 1843, has page priority over Unio occultus Lea, 1843, but the former is a junior homonym of Unio fulvus variety fuscata Rafinesque, 1831.
Unio maywebbae Wright, 1934, is a synonym.