ammodiscus ammodiscus ammodiscus is a genus in the family ammodiscidae of textulariid foraminifera. ammodiscus species are vagile, epibenthic foraminiferans, usually found in seawater with normal salinity. ammodiscustemporal range: silurian - present scientific classification domain: eukaryota (unranked): sar (unranked): rhizaria superphylum: retaria phylum: foraminifera order: textulariida superfamily: ammodiscacea family: ammodiscidae genus: ammodiscusreuss, 1862