Canal systems are advanced architectural features enabling the connection of various body regions via a network of passages. In Foraminifera, they enhance protoplasmic flow. Although they are principally observed in benthic representatives of the multilocular calcitic Order Rotaliida, canal systems presumably first appeared in a tubular, morphologically less complex foraminifer: the Bathonian-Cenomanian trochospiral genus Coscinoconus of the Order Involutinida. Based on the high-resolution analysis of a unique set of aragonitic Coscinoconus specimens, we here demonstrate that the porous system observed in the umbilical mass of these trochospiral Involutinida is a temporary feature. During ontogeny, it is at least partially plugged by aragonite directly secreted by the foraminifer, a process which limits its functional importance. A similar but open (unsealed) porous system is observed in another Involutinida genus, the planispiral Albian marker Hensonina, a controversial form that is here formally reinstated with Hensonina canalicula n. sp. as its type-species. The origin and development of these two porous systems are examined and compared with that of other foraminiferal groups, leading us to propose a clearer definition for wall pores and canal systems. Jurassic-Cretaceous Involutinida offer a fascinating example of a change in the role and function of wall pores through evolution.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Foraminifera: did the first canal systems develop in Involutinida?","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"macroevolution; wall perforations; canal systems; aragonitic foraminifers; morphogenesis","OtherDescriptors":null,"Notes":null,"AnaPub":2024,"MonPub":null,"DateUpdate":"2024-01-15","DateCreate":"2024-01-15","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000920160600001","VABBcode":null,"OpenAcc":0,"DOI":"10.1080/08912963.2022.2155954"},"refs":null,"anarec":{"AnaID":380820,"PubliDate":2024,"Pagination":"221-240","XtraPublOfAnaID":null,"ISBN":null,"Volume":"36","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":269135,"SerRR":"Historical Biology. 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