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Lophotrochozoa

Nectocaris
Photo credit: Martin R. Smith, CC0, via Wikimedia Commons.

Fossil Friday: Nectocaris, the Impossible Squid

Paleontology sometimes seems like a kind of imaginative Rorschach test with the flattened fauna of roadkill. Read More ›
Namacalathus and Cloudina
Namacalathus and Cloudina fossils
Photo: Namacalathus and Cloudina fossils, collection of Redpath Museum, McGill University, by Daderot / CC0, via Wikimedia.

Namacalathus Revisited — Not Much to See

The new evidence is very ambiguous and totally inconclusive. No far-reaching conclusions should be drawn from such dubious material. Read More ›
Kimberella
Kimberella
Photo: Kimberella, by Ghedoghedo / CC BY-SA (https://creativecommons.org/licenses/by-sa/3.0).

#2 Story of 2020: Kimberella Is No Solution to the Cambrian Conundrum

None of the Cambrian animal phyla is represented in the Ediacaran fossil record. Read More ›
Kimberella
Kimberella
Photo: Kimberella, by Ghedoghedo / CC BY-SA (https://creativecommons.org/licenses/by-sa/3.0).

Kimberella Is No Solution to the Cambrian Conundrum

The fossil record speaks clearly and cries out loud: the history of life on Earth is a history of saltations. Read More ›
Kimberella quadrata
Kimberella quadrata
Photo: Dorsal mold of Kimberella quadrata from the Ediacaran of Russia,
showing the cuticular dorsal shield with tubercular nodes and the tapered oral end; by Aleksey Nagovitsyn: Wikimedia, GNU FDL).

Kimberella and Controversial Relationships — A Chronological Synopsis

It is remarkable, indeed, how detailed a medusoid morphology was projected onto Kimberella fossils and later recognized as pure fantasy. Read More ›
Kimberella quadrata
Kimberella quadrata
Photo: Dorsal mold of Kimberella quadrata from the Ediacaran of Russia,
showing the cuticular dorsal shield with tubercular nodes and the tapered oral end; by Aleksey Nagovitsyn: Wikimedia, GNU FDL).

Was Kimberella a Precambrian Mollusk?

If identified as an animal, it would “predate the Cambrian explosion of bilaterian animal phyla as a kind of ‘advance guard.’” Read More ›

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