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Showing results for tags 'margaretia'.
oilshale posted a fossil in Other InvertebratesOriginally interpreted as a green algae with a relationship to the modern green alga Caulerpa, Margaretia dorus is now considered to be the feeding tube of the hemichordate Oesia. The position of Oesia is uncertain. Originally described as an annelid worm by Walcott (1911), a recent reinterpretation as a chaetognath (Szaniawski, 2005, 2009) has been vigorously rejected, and a position closer to the hemichordates proposed instead (Conway Morris, 2009). Margaretia dorus would now be a junior synonym of Oesia disjuncta Walcott, 1911 Lit.: Simon Conway Morris and R. A. Robison (