’Sorry to be ruining your day !!’ (P. Bouchet, in email, 29 December 2005) Some critical remarks on a recently published paper on the development of Cuvierinidae (Basteria 69, 2005) are discussed. A diagnosis for the family Praecuvierinidae Janssen, 2005 is provided. A replacement name, Urceolarica nom. nov., is introduced for Urceolaria Janssen, 2005, not of Lamarck, 1801 or Stein, 1867. Authorship of some family group names is corrected and the systematics of Thecosomata are revised.

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Nederlandse Malacologische Vereniging

Arie W. Janssen. (2006). Notes on the systematics, morphology and biostratigraphy of fossil holoplanktonic Mollusca, 16. Some additional notes and amendments on Cuvierinidae and on classification of Thecosomata (Mollusca, Euthecosomata). Basteria, 70(1/3), 67–70.