Caecum s.l. Fleming, 1813 Caecum Fleming, 1813: 67. Type species (SD: Gray, 1847) Dentalium trachea Montagu, 1803, Northeastern Atlantic. Odontidium Philippi, 1836: 102. Type species (OD) Odontidium rugulosum Philippi, 1836, Magnisi, Siracuse, Sicily. Brochina Gray, 1857: 101. Type species (OD) Dentalium glabrum Montagu, 1803, European Atlantic. Elephantanellum Bartsch, 1920: 567. Type species (OD) Caecum heptagonum Carpenter, 1857. Mazatlan. Micranellum Bartsch, 1920: 568. Type species (OD) Caecum crebricinctum Carpenter, 1864. San Diego, California. Caecum (Defolinia) Weisbord, 1962: 166. Type species (OD) Caecum (Defolinia) tomaculum Weisbord, 1962, Mare formation, Punta Gorda, Venezuela †. Pictocaecum Habe, 1978: 3. Type species (OD) Pictocaecum japonicum Habe, 1978, Kyushu, Japan. Diagnosis. Shell minute; teleoconch tubular, slightly curved, smooth or crossed by axial ribs, longitudinal grooves, lines, cords, or a combination. Posterior end closed by conical septum. Protoconch planispirally coiled.

Published as part of Raines, Bret K., 2020, A Rosetta Stone for eastern Pacific Caecidae (Gastropoda: Caenogastropoda), pp. 1-146 in Zootaxa 4827 (1) on page 7, DOI: 10.11646/zootaxa.4827.1.1, http://zenodo.org/record/4402308