ammonites
Calliostoma rhombotoide Gardner 1947 (top snail)

Gastropoda - Trochoidea - Trochidae

Full reference: J. R. Gardner. 1947. The Molluscan Fauna of the Alum Bluff Group of Florida. United States Geological Survey Professional Paper (142A-H)1-709

Belongs to Calliostoma according to A. J. W. Hendy et al. 2008

Sister taxa: Calliostoma (Ampullotrochus), Calliostoma (Calliostoma), Calliostoma (Elmerlinia), Calliostoma (Eutrochus), Calliostoma (Leiotrochus), Calliostoma (Pulchrastele), Calliostoma (Salsipotens), Calliostoma (Sarmates), Calliostoma (Sinutor), Calliostoma (Tristichotrochus), Calliostoma aphelium, Calliostoma attrina, Calliostoma bellicosum, Calliostoma bellum, Calliostoma blanfordi, Calliostoma calvertanum, Calliostoma castilla, Calliostoma ceramicum, Calliostoma cirrus, Calliostoma decamposi, Calliostoma derbyi, Calliostoma eboreus, Calliostoma exile, Calliostoma flumenvadum, Calliostoma grabaui, Calliostoma grammaticum, Calliostoma granulata, Calliostoma hannibali, Calliostoma humile, Calliostoma ligatum, Calliostoma limonensis, Calliostoma metrium, Calliostoma mirificum, Calliostoma monile, Calliostoma negroensis, Calliostoma nonurum, Calliostoma peralveatum, Calliostoma philanthropus, Calliostoma pirabicum, Calliostoma promense, Calliostoma puelchanum, Calliostoma reclusus, Calliostoma retectum, Calliostoma rhombotum, Calliostoma rugabasis, Calliostoma singuense, Calliostoma speciosa, Calliostoma tarltonense, Calliostoma tegulum, Calliostoma tropica, Calliostoma virginicum, Calliostoma wagneri, Calliostoma zizyphinum

Type specimen: USNM 498392, a shell. Its type locality is USGS Loc. 10603 - White's Creek [Shoal River Fm], which is in a Serravallian marine marl/sandstone in the Shoal River Formation of Florida.

Ecology: epifaunal carnivore

Average measurements (in mm): shell 3.80 x 3.50