thumb|Side and top view of a Cryptella canariensis from the Canary Islands thumb|Shell of Cryptella canariensis thumb|An unidentified semi-slug from List of non-marine molluscs of Uganda|Uganda
thumb|Side and top view of a Cryptella canariensis from the Canary Islands thumb|Shell of Cryptella canariensis thumb|An unidentified semi-slug from List of non-marine molluscs of Uganda|Uganda
Semi-slugs, also spelled semislugs, are land gastropods whose shells are too small for them to retract into, but not quite vestigial. The shell of some semi-slugs may not be easily visible on casual inspection, because the shell may be covered over with the mantle.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).