Preface: Acta Zoologica centennial.

Acta Zoologica was founded in 1920 by Nils Holmgren, professor of Zoology at the private Stockholm College (now the publicly funded Stockholm University). However, Holmgren (with 22 papers, some very large) is beaten by Lorenzo Alibardi of Bologna, Italy, who has published 32 papers in Acta Zoologica so far, probably with many more to come. Another category of often well-cited papers is exemplified by Holmgren's 1933 paper on the origin of tetrapod limbs, a topic to which he returned several times in later papers published in Acta Zoologica. [Extracted from the article]