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Findings in Australia unveil fossil trove of Cambrian mollusks

Black mountain unveils fossil trove
All specimens whitened with NH4Cl. (A–D) QMF 39529, holotype. (A) Lateral view, siphuncle on the left side. (B) Ventral view. (C) Apertural view. (D) Apical view. (E–H) QMF 39533, paratype. (E) Lateral view, siphuncle on right side. (F) Ventral view. (G) Apical view. (H) Dorsal view. (I) QMF 13332, paratype, apical view. Dashed line indicates position of polished surface (Fig. 7L). (J) QMF 39542, paratype, ventral view. Credit: PeerJ (2024). DOI: 10.7717/peerj.17003

A team of researchers led by Alexander Pohle has unveiled a treasure trove of ancient fossils from Queensland, Australia's Black Mountain. The findings, published in PeerJ, shed new light on the complex three-dimensional siphuncle morphology of Plectronoceratids, a pivotal group of mollusks from the latest Cambrian period.

The study surpasses the entirety of previously documented Plectronoceratid fossils, presenting over 200 well-preserved specimens. These fossils, meticulously collected by the late Mary Wade and her team during the 1970s and 1980s, offer unprecedented insights into the intricate structures of these ancient creatures.

Pohle's team focused on specimens from the lower Ninmaroo Formation at Black Mountain, meticulously examining the three-dimensional morphology of the siphuncle. This comprehensive analysis revealed a remarkably intricate siphuncular structure, challenging previous interpretations based on longitudinal sections and prompting a major revision of the taxonomic classification within the order Plectronoceratida.

Of particular note is the discovery of Sinoeremoceras marywadeae sp. nov., a named in honor of Mary Wade. This species, characterized by its highly oblique siphuncular segments and elongated septal neck, represents a significant addition to the cephalopod evolutionary tree. Moreover, the study advocates for a revised taxonomy, consolidating multiple species, genera, families and even one order under the Plectronoceratida.

Pohle expressed his gratitude to Mary Wade, whose dedication to specimen collection and preparation paved the way for this groundbreaking research. "Would it not be for her, these faunas would still largely be unknown," said Pohle. The team hopes that their work honors Wade's legacy, acknowledging the invaluable contributions she made to paleontological science.

As the delves deeper into the origins of cephalopods, Pohle's team emphasizes the significance of further exploration and advanced imaging techniques. They advocate for the use of 3D reconstructions, such as µCT scans or serial grinding tomography, to unlock new dimensions of understanding in research on Palaeozoic cephalopds.

The publication of this study marks a pivotal moment in our quest to unravel the mysteries of ancient marine life. With each fossil unearthed, we inch closer to a comprehensive understanding of Earth's prehistoric past.

More information: Plectronoceratids (Cephalopoda) from the latest Cambrian at Black Mountain, Queensland, reveal complex three-dimensional siphuncle morphology, with major taxonomic implications, PeerJ (2024). DOI: 10.7717/peerj.17003

Journal information: PeerJ

Provided by PeerJ

Citation: Findings in Australia unveil fossil trove of Cambrian mollusks (2024, February 29) retrieved 21 April 2024 from
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