Moelleriopsis messanensis (Senguenza, 1876)
Live specimens are collected in western Mediterranean. Deposit feeder in 400-1200m deep (Ardovini & Cossignani, 1999). Empty shells are found between 350m and 2500m deep.
Original taxon: Cyclostrema messanensis.
 
« Surface smooth except for 5–7 basal ridges running inside and around the umbilicus and a dorsal ridge starting at the beginning of teleoconch and slowly fading next the 1½ whorl. […] Protoconch paucispiral of about 0.5 whorl sculptured with close-set spiral threads and separated from teleoconch by a varix. umbilicus broad and deep. Aperture wide, circular. » – Romani & Bogi: “Moelleriopsis messanensis (Seguenza, 1876), its radula and taxonomic position”, Iberus vol. 34, Barcelona 2016, p.84. – Isola Capraia, Toscana, W. Italy. 2mm.

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