The Limbunya Group is a group of late Paleoproterozoic formations from Australia. It contains several of the earliest eukaryotic fossils known, including several tubular forms and acritarchs.
Paleobiota After Riedman et al, 2023
Paleobiota PaleobiotaGenusSpeciesNotesImagesBirrindudutubaB. brigandinaEnigmatic tubular fossil, likely eukaryotic, covered in small circular plates.KamolineataK. elongataEnigmatic ellipsoid fossil, likely eukaryoticFilinexumF. torsivumEnigmatic tubular fossil, likely eukaryotic, outer wall composed of bound fibresSatkaS. favosaEnigmatic spherical fossil, likely eukaryotic, covered in small platesSiphonoseptumS. bombycinumEnigmatic filamentous fossil, bears similarities to both eukaryotic filaments and cyanobacteriaSpiromorphaS. segmentataEnigmatic filamentous/ellipsoid fossil, likely eukaryoticValeriaV. lophostriataEnigmatic spherical fossil, likely eukaryotic, unusually small for the genus?D. macroreticulataEukaryotic acritarch, differs from the assigned species in shape yet closest resembles it.GigantosphaeridiumG. fimbriatum G. floccosumEukaryotic acritarchLimbunyasphaeraL. operculataEukaryotic acritarch, earliest known fossil with an operculumTappaniaT. planaEukaryotic acritarchGerminosphaeraG. bispinosaEnigmatic acritarchLeiosphaeridiaL. crassa L. jacutica L. minutissima L. tenuissimaEnigmatic acritarch, one of the widest-ranging Precambrian fossilsNavifusaN. majensisEnigmatic acritarch, possibly eukaryoticOscilatoriopsisO. obtusaEnigmatic filamentous fossil, likely bacterialPterospermopsimorphaP. spEnigmatic filamentous fossilSiphonophycusS. septatum S. robustum S. typicum S. kestron S. solidum S. punctatumEnigmatic filamentous fossil, likely bacterialTortunemaT. patomicaEnigmatic filamentous fossil
Alongside these, several undescribed forms are also recorded. Forms A and B are eukaryotic in nature, with B particularly resembling Satka in its spherical shape and the presence of plates. Form B also bears similarities to another unnamed organism from the Tonian Chuar Group. The rest of the unnamed forms are mostly ellipsoidal or spherical in nature, with others being sheet-like or miscellaneous fragments.
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