Cyclostremiscus bartschi (Mansfield, 1936)

Scanning electron micrographs (SEM) of Fossil specimens

Cyclostremiscus bartschi (Mansfield, 1936) Fossil

Cyclostremiscus bartschi (Mansfield, 1936)

Cyclostremiscus bartschi (Mansfield, 1936)

    Lower Pinecrest beds, Upper Tamiami Formation, Sarasota County, Florida. SEMs produced in collaboration with Dr. Ann Heatherington, Dept. Geological Sciences, University of Florida, Gainesville, FL. This taxon differs from Cyclostremiscus jeannae Pilsbry and McGinty, 1946 Jeanne’s Vitrinella by having a more depressed profile and a wider, more perspective umbilicus. Unlike C. jeannae, the peripheral cord becomes obsolete in more mature shells.

Cyclostremiscus species

Cyclostremiscus species

1.33 mm.

Cyclostremiscus species

1.20 mm.

Cyclostremiscus species

1.33 mm.

Cyclostremiscus species

1.00 mm.
    Cochran Pit, Caloosahatchee Formation, LaBelle, Hendry County, Florida. SEMs produced in collaboration with Dr. Ann Heatherington, Dept. Geological Sciences, University of Florida, Gainesville, FL.

Cyclostremiscus species

    Caloosahatchee Formation, St. Petersburg, Pinellas County, Florida (1.60 mm.). SEM produced in collaboration with Dr. Ann Heatherington, Dept. Geological Sciences, University of Florida, Gainesville, FL.
    Olsson and Harbison (1953: 425-426; pl. 54: figs. 2, 2a, 2b, 3, 3a, 4, a) treated this species as C. bartschi (Mansfield, 1930), but the body whorl of that species is convex and bears a peripheral spiral cord as depicted in the images on the beginning of this page. This un-named taxon is probably extinct despite tenuous Recent records cited by Rubio, Fernández-Garcés, and Rolán (2011; 95-96) whereas the true C. bartschi is represented in the Recent fauna of FL and the Caribbean by its descendant, Cyclostremiscus vanbruggeni De Jong and Coomans, 1988.

 De Jong, K. M. and H. E. Coomans, 1988. Marine gastropods from Curaçao, Aruba and Bonaire. E. J. Brill, Leiden, v + pp 1-261 incl. 47 pls. <https://repository.naturalis.nl/pub/506113>
 Mansfield, W.C., 1930. Miocene gastropods and scaphopods of the Choctawhatchee Formation of Florida. Florida Geological Survey Bulletin 3: 189 pp. <
http://ufdc.ufl.edu/UF00000437/00001?search=bulletin>          
Olsson, A.A. and A. Harbison, 1953. Pliocene Mollusca of southern Florida.
Monograph No. 8 Academy of Natural Sciences of Philadelphia. v + pp. 1-457 + 65 pls.
Rubio, F., R. Fernández-Garcés, and E. Rolán, 2011. The family Tornidae (Gastropoda: Rissooidea) in the Caribbean and neighboring areas. Iberus 29(2): vii + 1-230. December.