Diagnosis. Straight or slightly cyrtoconic, circular or subcir-cular shell, with prominent, narrowly spaced annulations,growth lines, and numerous subordinate filiform longitudin-ally raised lines, producing a fine reticulate pattern. Siphun-cle central or slightly eccentric, slightly expanded, withachoanitic to very short orthochoanitic septal necks. Apexblunt, slightly cyrtoconic, annulated.