10


Journal of Paleontology 91(1):1–11


lateral segments together with a likely reproductive role for these segments, as indicated by modeling and ontogeny, points to placementwithin the subtribe Triploporellinae (see Deloffre, 1988). The phylogenetic significance of these taxa remains to be investi- gated, but so considered Wiartonella becomes the oldest member of both the tribe and subtribe, the next oldestmembers being calcified taxa of late Paleozoic age, as well as an early member of a putative lineage that includes theMesozoic cladospore taxon Triploporella. It is possible that Kalania should be placed in the Triploporellinae as well, given that all aspects of lateral morphology and arrange- ment are consistent with such an assignment and the ovate objects labeled as gametophores in Tinn et al. (2015) would seem to leave room for alternative interpretations, in part because they are not shown to be in unequivocal anatomical contact with other thallus elements. Perhaps most importantly in evolutionary terms, the development of laterals with distinctly inflated terminations and euspondyl arrangement in both Wiartonella and cyclocrinitids suggests the possibility that these early Paleozoic macroalgae are rooted in a close common ancestor.


Acknowledgments


The late H. Stobbe and his children, L. Grimoldby and T. Stobbe, of Owen Sound Ledgerock Ltd., provided valuable access and assistance during fieldwork, without which this study would not have been possible. E. Behringer provided assistance with the biophysical modeling component of the project, and comparisons with fossil Dasycladales were aided by discussions with F. Barattolo. J. Schiffbauer kindly assisted with scanning electron microscopy analyses and provided the EDS image. The final manuscript was improved by comments provided by B. Granier and an anonymous reviewer; the associate editor, R. Lupia; and the editor, J. Jin. This project was partially funded by NSF EAR 1250756 awarded to S.L. D.T. would also like to thank A. Lenz as advisor for the doctoral project during which Wiartonella was discovered and initially studied, partially funded by an NSERC Operating Grant to Lenz.


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