Trigonostylops wortmani (Ameghino 1897; Late Paleocene—Early Eocene; est. 1.5m) nests between Meniscotherium and Brachycrus in the LRT, basal to other astrapotheres. Here the the original dotted lines are given two more options, closer to related taxa.

Brachycrus laticeps (originally Merycochoerus Douglass 1900; CM796; Miocene, 14mya; 1m long) was considered an North American oreodont with a tapir-like trunk and deep jaws, but here nests with South American Astrapotherium.Both are derived from North American Meniscotherium.

Astraponotus assymemetrum (Ameghino 1901; Late Eocene 35mya) is a transitional South American taxon nesting with Astropotherium, midway in size between it and Brachycrus.

Astrapotherium magnum (Burmeister 1879, Hatcher 1901; Paleocene-Miocene, 59-12 mya; 3m long) was considered a South American ungulate and a member of the order, Astrapotheria, by the authors of Wikipedia. They report, "The history of this order is enigmatic." Here Astrapotherium nests with Meniscotherium.

Like a hippo, the large and ever-growing curved canines of Astrapotherium scraped against each other during life producing sharp tips. Uniquely, the rostrum was much shorter than the mandibles. The feet and toes were all small. The narial opening was elevated to the top of the skull. Astrapotherium likely had a tapir-like (Fig. 3) trunk.