Cranial ribs in Devonian lungfishes and the origin of dipnoan air- breathing

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Abstract

Two upper Givetian-lower Frasnian lungfishes from Mt. Howitt, Victoria which have cranial ribs, show remarkable similarities in postcranial skeletons, despite one being tooth-plated (Howidipterus donnae Long, 1992) and the other having denticle-covered dentition (Barwickia downunda Long, 1992). It is suggested that such a complex suite of characters for air gulping probably arose only once in dipnoan evolution, so cranial ribs may denote a monophyletic group that includes all post-Middle Devonian tooth-plated dipnoans plus Conchopoma. Dentitions of the two Mt. Howitt lungfishes confirms their placement in the Fleurantiidae and close relation as sister taxa. -from Author

Original languageEnglish
Pages (from-to)199-209
Number of pages11
JournalMemoir - Association of Australasian Palaeontologists
Volume15
Publication statusPublished - 1 Jan 1993
Externally publishedYes

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