Helicodiscus fimbriatus Wetherby, 1881 Fringed Coil

Scanning Electron Micrographs (SEM)

    Paint Rock River system, Estill Fork, 1 mile N. Estillfork, Jackson County, Alabama (3.11 mm. in maximum diameter for specimen in the bottom three images). Bob Winters! 17 March, 2015. Specimens culled by H. G. Lee, and SEMs produced in collaboration with Dr. Ann Heatherington, Dept. Geological Sciences, University of Florida, Gainesville, FL.  Contrasts with the much more robust spirals of Helicodiscus notius notius Hubricht, 1962 Tight Coil.