Nomenclatural history of Jefferson, 1799 (Mammalia, Xenarthra, Pilosa, Megalonychidae).

Both authorship and spelling of the extinct giant sloth genus and its type species, (Mammalia, Xenarthra, Pilosa, Megalonychidae), have been inconsistent. The genus-group name has been cited with two different authorships and three dates, and it has been spelled with two different suffixes. The species-group name has been cited with four different authors and dates, and it has been spelled with two different endings.

Replacement names for two species of Agassiz, 1843 (Chondrichthyes, Xenacanthiformes), and discussion of Whitley, 1940, replacement name for Giebel, 1848 (Chondrichthyes, Xenacanthiformes), preoccupied by Müller & Troschel, 1844 (Actinopterygii, Characiformes).

Three species assigned to the same nominal genus of Paleozoic xenacanthiform shark have been combined with the name (Chondrichthyes, Xenacanthiformes, Orthacanthidae). (Giebel, 1848), which was originally combined as Giebel, 1848, is the senior synonym; it has priority over both (Newberry, 1857), which was originally combined as Newberry, 1857, and Newberry, 1875a. Proposed species-group replacement names are for (Newberry, 1857) and for Newberry, 1875a.

, a new genus of Sceliotrachelinae (Hymenoptera, Platygastridae) from Australia.

is described as a new genus and species of Sceliotrachelinae. most closely resembles genera of the -cluster but possesses several characters that readily separate it from other sceliotracheline genera. The key of Masner and Huggert (1989) is modified to accommodate , and the relationship of the genus to other members of the subfamily is discussed.