Ordovician nautiloids of central Australia, with a revision of Madiganella Teichert & Glenister.

B. Stait, J. Laurie

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7 Citations (Scopus)


Nautiloids mainly from the Lower Ordovician Horn Valley Siltstone of the Amadeus Basin are revised. Madiganella is shown to have unexpanded two-layered bullettes and well-developed endocones, the endosiphutobe of which have previously been mistaken for a free siphonal tube. These features do not allow assignment of Madiganella to the Ruedemannoceratidae as has been suggested: instead the genus belongs to a new family of Discosorida. Madiganella magna Teichert & Glenister 1952 and M. sp. (flower & Teichert, 1957) are shown to be synonyms of Madiganella tatei (Etheridge). Endoceras warburtoni Etheridge is assigned to Anthoceras Teichert & Glenister, and Anthoceras decorum Teichert & Glenister from Western Australia is considered a junior synonym. The specimens recently described by Crick & Teichert (1983) as A.decorum from Mount Arrowsith, New South Wales, belong to a different species, herein named A. arrowsmithense n. sp. The type specimens of Bactroceras gossei (Etheridge) are redescribed and refigured. A species of Aphetoceras is present, but it is not Aphetoceras delectans Teichert & Glenister. Also present is Lobendoceras emanueknse Teichert & Glenister, as well as a new genus of discosorid, known also from Thailand and possibly from Queensland. 'Trochoceras recticostatum' Tate is too poorly preserved to be assigned even to a family. Armenoceras is recorded from the Stairway Sandstone. -Authors

Original languageEnglish
Pages (from-to)261-266
Number of pages6
JournalBMR Journal of Australian Geology & Geophysics
Issue number3
Publication statusPublished - 1984
Externally publishedYes


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