…but Rhyncholestes raphanurus (Osgood, 1924; long-nosed shrew-opossum, Chilean shrew opossum, extant; snout-vent length 20cm), nests in the large reptile tree (LRT, 1259 taxa) between the squirrel-like tree shrew, Apatemys, and a large living shrew, Scutisorex, all within the placental clade, Glires. Wikipedia and other sources consider this shrew-like South American mammal a marsupial, but Wiki also notes that Rhyncholestes lacks a marsupium (pouch). Females have seven nipples.
Rhyncholestes appears to be terrestrial,
nocturnal and an omnivore with a very restricted range (central Chile). Unlike the common shrew, Scutisorex, Rhyncholestes has a complete zygomatic arch and 3 large molars + a fourth vestige molar. That may be why it was considered a marsupial… but that would be pulling a Larry Martin in the LRT, where you need hundreds of traits to determine where a taxon nests.
Osgood WH 1924. Review of living caenolestids with description of a new genus from Chile. Field Museum of Natural History Zoological Series 14, 165–173.