Caves and their Faunas in Florida and South Georgia 35 



Phylum MOLLUSCA 

 Class BIVALVIA 

 Family Cyrenidae 

 Corbicula fluminea (O.F.M.) (troglophile?). Columbia County. 

 Siphon Creek Cave (TM); Lafayette County: Green Sink (TM); Suwan- 

 nee County. Peacock Springs Cave (Streever \992a). 



Family Unionidae 

 Uniomerus obesus (Lee) (trogloxene?). Columbia County. Rose 

 Creek Swallet (James D. Williams, personal communication, National 

 Biological Survey, Gainesville, Florida). REMARKS: Mussels were 

 collected alive buried in hard sand on the floor of this spring cave 

 between the entrance and 60 meters penetration at water depths up to 

 12 meters. Their distribution in the cave probably is limited by the 

 availability of filterable foods and the abilities of the host fish that 

 carry the parasitic glochidia to penetrate subterranean habitats. The 

 food supply may include the thin veneer of organic silt that covers 

 the sand at this site. 



Class GASTROPODA 



Subclass PROSOBRANCHIA 



Family Pleuroceridae 



Elimia clenchi (Goodrich), Slackwater Elimia (trogloxene). Holmes 



County. Vortex Blue Spring (Helfman 1986). REMARKS: Reported 



as benthos from the cavern portion of Vortex Spring, but not from the 



deeper portions of the cave. 



Elimia curvicostata (Reeve), Graphite Elimia (trogloxene). 

 Washington County: Econfina Blue Springs Cave (RF, Thompson and 

 Hershler 1991). REMARKS. This species was collected with the troglobitic 

 snail, Dasyscias franzi, in the cave. Elimia curvicostata also occurred 

 in the outflow and spring pool of Econfina Blue Spring; other snail 

 species, including Elimia athearni, were found in the spring pool but 

 not in the cave stream. 



Family Hydrobiidae 

 Amnicola retromargo Thompson (troglophile). Hamilton County: 

 Shallow Spring (FGT). REMARKS: These snails were collected approxi- 

 mately 60-600 meters inside the cave (water depth 12 meters) on 

 boulders on the floor and on the cave walls in strong water currents. 

 These specimens were lighter in color than individuals found in surface 

 streams (F. G. Thompson personal communication, Florida Museum of 

 Natural History). 



