Karma Nanglu says that his favorite animal is always the one he's currently studying. However, his most recent discovery might remain at the top of his list for some time: a half-billion-year-old fossil from the wonderfully weird group of marine invertebrates, the tunicates. “This animal is as ex
Megasiphon thylakos,
There are two main tunicate lineages, ascidiaceans and appendicularias. Most ascidiaceans begin their lives looking like a tadpole and mobile, then metamorph into a barrel-shaped adults with two siphons. They live their adult life attached to the seafloor. In contrast, appendicularians retain the look of a tadpole as they grow into adults and swim freely in the upper waters.
Details of the anatomy of Megasiphon thylakos. M. thylakos had two prominent siphons and a barrel-shaped body. It also had prominent longitudinal muscles running from the tips of the siphons to the base of the body. These are comparable with modern tunicates, including Ciona intestinalis, which is dissected in c and f. Even the micrometer-sized individual muscle fibers can be compared between this 500-million-year-old fossil and modern tunicates.
There are many Cambrian fossil sites with exceptional preservation in the United States, but these are often overlooked compared to those from the Burgess Shale in Canada and Chengjiang in China. “The discovery ofperfectly illustrates why Javier and I have been conducting fieldwork in Utah for the last ten years,” said Lerosey-Aubril.
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