Lesson plan
Marginix
Marginix is an extinct genus of brittle star in the family Encrinasteridae that lived during the Devonian period in South America and Africa. It contains three named species. The type species, M. yachalensis, was originally named as a species of Encrinaster in 1916, and its remains are known from Argentina. A second species, M. hilleri, was first described in 1999 based on specimens from South Africa, and a third species, M. notatus, originates from Brazil and was named in 2020. Fossils of Marginix were first recognized to represent a distinct genus in 1995, but the genus was only given its current name in 2015. Prior to this, it was given the names Marginaster and Marginura, but both were preoccupied and had to be replaced.
Article summary
Marginix is an extinct genus of brittle star in the family Encrinasteridae that lived during the Devonian period in South America and Africa. It contains three named species. The type species, M. yachalensis, was originally named as a species of Encrinaster in 1916, and its remains are known from Argentina. A second species, M. hilleri, was first described in 1999 based on specimens from South Africa, and a third species, M. notatus, originates from Brazil and was named in 2020. Fossils of Marginix were first recognized to represent a distinct genus in 1995, but the genus was only given its current name in 2015. Prior to this, it was given the names Marginaster and Marginura, but both were preoccupied and had to be replaced.
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Discussion questions
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