These are two of my favorite species from the Chipola Formation, perhaps because they are both relatively rare and it took me several years (and many collecting trips) to find specimens for my own collection. Nonetheless, all of the specimens I have were collected in only two trips!
Both species of Turbo found in the Chipola Formation appear to be limited to coral reef deposits, and in fact, all of the specimens shown below were collected in the offshore patch reef facies.
Turbo (Halopsephus?) chipolanus Schmelz, 1995 is the more common species, with 9 specimens in the type lot (7 from TU 555 on the Chipola River, and 2 from TU 1048 along Farley Creek). Schmelz considered this species most similar to the rare Recent species, Turbo haraldi Robertson, 1957. I have 4 specimens of this species in my collection, 3 of which are shown below. They measure from 15mm to 23 mm in height, in line with the material in the type lot.
Turbo (Taeneaturbo) pactilis Schmelz, 1995 is my favorite species, due to both its size and rarity. The type lot contains one complete specimen from TU 555 on the Chipola River, one incomplete specimen from TU 547 on the Chipola River, and 3 fragments from TU 1048 along Farley Creek. Schmelz compared this species to Turbo dominicensis Gabb, 1873 from the Cercado Formation of the Dominican Republic, as well as the Recent species, Turbo canaliculatus Hermann, 1781. I have only one specimen of this species in my collection, but as you can see, it is much larger than the holotype (45mm versus 27mm in height) and in almost perfect condition.