After McKenna & Bell, 1997, Archibald, Averianov & Ekdale, 2001, Fostowicz-Frelik & Kielan-Jaworowska, 2002 and Archibald and Averianov, 2003

<==o †Zalambdalestidae Gregory & Simpson, 1926 sensu Archibald, Averianov & Ekdale, 2001 ["Zalambdalestida"; Zalambdalestoidea Kalandadze & Rautian, 1992; Kulbeckiidae Nesov, 1993] [Basal Anagalids sensu McKenna & Bell, 1997, paraphyletic sensu Archibald, Averianov & Ekdale, 2001]
   |-- †Alymlestes kielanae Averianov & Nesov, 1995
   |?- †Beleutinus orlovi Bazhanov, 1972 [could be a deltatheroid too?]
   |-- †Kulbeckia kulbecke Nessov, 1993 [taxonomic history] [Kulbeckiidae Nessov, 1993]
   `--+-- †Barunlestes butleri Kielan-Jaworowska, 1975
      `-- †Zalambdalestes lechei Gregory & Simpson, 1926


Zalambdalestid are one of the most problematic Late Cretaceous mammals. For long time they were considered as basal eutherians. They had some interresting specialitions that seemed to parallel the evolution of Rodents and Lagomorphs, but they were considered not related to true rodents.

This view seems to be slowly chancing, since McKenna & Bell (1997) included zalambdalestids to their Grandorder Anagalida. Averianov (2000) placed Kulbeckia as a sistergroup of Ungulatomorpha. But more recently it has been seen as a zalambdalestid euthere (Archibald, Averianov & Ekdale, 2001, Archibald and Averianov, 2003).