New species and records of Scissurellidae and Anatomidae from the Americas (Mollusca: Gastropoda: Vetigastropoda) Author Geiger, Daniel L. Author Mclean, James H. text Zootaxa 2010 2356 1 35 journal article 10.5281/zenodo.275645 c9d212c2-bfed-4043-971c-b80ab6d7ff9c 1175-5326 275645 Sinezona Finlay, 1926 Type species. Schismope brevis Hedley, 1904 (OD). Diagnosis. Scissurellidae with slit closed to foramen at maturity, keels of foramen not elevated to form chimney. Remarks. In juveniles, the selenizone may be shorter and the slit is still not closed to a foramen. Juvenile Sinezona and adult Scissurella both have an open slit; mature specimens can be recognized by the descending last quarter whorl.