Diagnosis. Straight, slightly compressedStriatocycloceraswith high apical angle of approximately 10. Six, irregularlyspaced smooth annulations at a distance that equates the cor-responding shell diameter in adult, with three annulations injuvenile specimens, respectively. Annulations slightly obliquetoward growth direction with slight lateral sinus, with ap-proximately 10 growth lines per annulation. One suture lineat every groove of the annulation, annulations slightly obli-que toward sutures.