Systematic paleontology of macroalgal fossils from the Tonian Mackenzie Mountains Supergroup

• Main Author: Maloney, Katie
• Format: Dataset
• Language: unknown
• Published: 2023
• Subjects: Yukon; Dolores; Holdfast; Wernecke; Wernecke Mountains; Mackenzie mountains
• Online Access: https://zenodo.org/record/7668346; https://doi.org/10.5061/dryad.hx3ffbgj9

Proterozoic eukaryotic macrofossils are rarely preserved with enough morphological detail to inform their phylogeny. This dataset includes the measurements and descriptions of three size classes of filamentous fossils from the Dolores Creek Formation of the Mackenzie Mountain Supergroup in the Wernecke Mountains, Yukon. This data was used to systematically describe and interpret the middle size class specimens as green macroalgae with an unbranching, uniseriate thallus (with uniform width throughout; n=304, width = 0.20 to 0.85 mm) and elliptical to globose anchoring holdfast. Fossils from the smaller size class (n = 90, width = 0.03 to 0.06 mm) retain too little morphological information to define properly. However, a third form is also documented, consisting of a ribbon-shaped thallus with a consistent width (n=19, width = 1.0 to 1.7 mm). The size range of these different, likely photoautotrophic, filaments supports the hypothesis of an increasing morphological complexity and overall diversification of macroalgae during the Tonian, setting the stage for dramatic changes to benthic marine ecosystems prior to the evolution of more complex ecosystems. Funding provided by: Natural Sciences and Engineering Research Council of CanadaCrossref Funder Registry ID: http://dx.doi.org/10.13039/501100000038Award Number: Post graduate scholarship, Undergraduate Student Research AwardFunding provided by: Natural Sciences and Engineering Research Council of CanadaCrossref Funder Registry ID: http://dx.doi.org/10.13039/501100000038Award Number: RGPIN435402Funding provided by: Natural Sciences and Engineering Research Council of CanadaCrossref Funder Registry ID: http://dx.doi.org/10.13039/501100000038Award Number: RGPIN2017-04025Funding provided by: National Aeronautics and Space AdministrationCrossref Funder Registry ID: http://dx.doi.org/10.13039/100000104Award Number: Exobiology Grant 80NSSC18K1086Funding provided by: National Science FoundationCrossref Funder Registry ID: http://dx.doi.org/10.13039/100000001Award Number: ...