Fig. 2From: Using Marine Snails to Teach Biogeography and Macroevolution: The Role of Larvae and Dispersal Ability in the Evolution and Persistence of SpeciesFossil snail shell from the Pinecrest Beds of the Tamiami Formation, Sarasota County, Florida. Arrows indicate the position of the protoconch (larval shell), which can be utilized to determine developmental mode. Images are focal stacks constructed from multiple images using Helicon Focus 5.2 (Kozub et al. 2011)Back to article page