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| Left: Artist's impression of Gyaltsenglossus senis. Right: The fossil as it appears in the Burgess shale. Illustration: Emily S. Damstra Both images © Royal Ontario Museum |
You know all those 'missing links' that much of creationism is based on but which turn up regularly in the fossil record?
Well, science has only gone and found yet another one!
This one, which the scientists have named Gyaltsenglossus senis (pronounced Gen-zay-gloss-us senis), turned up in the Burgess shales in the Canadian Rockies, famous for containing the soft-bodied 'Cambrian Explosion' fossils. It closes a gap in the record between two main branches of a group known as the hemichordates, exactly as predicted by the TOE. It was discovered by scientists from at the Royal Ontario Museum (ROM), the Smithsonian National Museum of Natural History, and the University of Montreal. The team published their work recently in Current Biology, sadly behind an expensive paywall. However the Royal Ontario Museum press release gives the details and explains the significance of this find:
With the early evolution of hemichordates being contentious among researchers, the discovery of Gyaltsenglossus senis is significant. It provides direct fossil evidence connecting the two major groups of hemichordates: the enteropneusta and pterobranchia.
Although enteropneusts and pterobranchs appear to be quite different types of animals, they are closely related. This close relationship is supported by DNA analysis of present-day species. More broadly, the role of Gyaltsenglossus in understanding hemichordate evolution helps us understand the origins of a larger group of animals called deuterostomes (which includes humans) by clarifying what characteristics they may have shared with hemichordates early in their history.
The enteropneusta are a group of animals known commonly as acorn worms, which are long, mostly mud-burrowing animals that can be found today in oceans around the world from the tropics to the Antarctic. The other main group of animals within hemichordates are pterobranchs, which are microscopic animals that live in colonies, each protected by tubes they construct and which feed on plankton using a crown of tentacled arms.
“Acorn worms and pterobranchs look so different from each other that understanding the origins of their evolutionary relationship has been a major historical question in zoology,” says Dr. Karma Nanglu, Peter Buck Deep Time post-doctoral fellow at the Smithsonian National Museum of Natural History and lead author on this paper. “Answering this question has been made much harder by the extreme lack of fossils of these soft-bodied hemichordates. Throughout the half-billion-year-long history of hemichordates you can count on one hand the number of exceptional preserved fossil species.”
Despite being just two centimeters in length, the remarkably preserved soft tissues of the Gyaltsenglossus fossils reveal incredibly detailed anatomical structures. These details include the oval-shaped proboscis of acorn worms and a basket of feeding tentacles similar to those of pterobranchs. The age of these fossils, combined with the unique morphological combination of the two major hemichordate groups, makes this discovery a critical find for understanding early hemichordate evolution.
“An ancient animal with an intermediary anatomy between acorn worms and pterobranchs had been hypothesized before but this new animal is the clearest view of what the ancestral hemichordate may have looked like,” says Dr. Christopher Cameron, Associate Professor at the University of Montreal and a co-author on this study. “It’s exciting to have so many new anatomical details to help drive new hypotheses about hemichordate evolution.”
In the case of Gyaltsenglossus, the exceptional preservation of these fine details can be attributed to the unique environmental conditions of the Burgess Shale, which rapidly entombed ancient animals in underwater mudslides. Through a combination of factors, including slowing the rate of bacterial decay in the entombed animals’ bodies, the fossils of the Burgess Shale are preserved with far greater fidelity than typical fossil sites.
“The Burgess Shale has been pivotal in understanding early animal evolution since its discovery over 100 years ago,” says co-author Dr. Jean-Bernard Caron, Richard M. Ivey Curator of Invertebrate Palaeontology at the ROM and Associate Professor at the University of Toronto. Dr. Caron led the field expedition in 2010 that collected the 33 fossils of Gyaltsenglossus.
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Hemichordates belong to a major division of animal life called Deuterostomia, which includes chordates like fish and mammals, and not the division of animal life called Protostomia, that includes arthropods such as insects and annelids (such as earthworms).
“When looking at Gyaltsenglossus, we are actually looking at a very, very distant relative of our own branch of vertebrate and human evolution. The close relationship between hemichordates and our own evolutionary group, the chordates, is one of the first things that made me excited to research them,” Dr. Nanglu explains. “Understanding the ancient connections that join animals like fish and even humans to their distant cousins like sea urchins and acorn worms is such an interesting area on the evolutionary tree and Gyaltsenglossus helps bring that link into focus a little bit more clearly.”
Once again then, science has falsified a basic dogma of creationism and shown the predictive power of the TOE, and incidentally, has found one of our earliest ancestors from half a billion years ago. As a co-author, of the paper, Dr. Christopher Cameron of the University of Montreal pointed out, the existence of an intermediate species such as this had been hypothesised before. The find confirms that hypothesis.
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