On a new pygasterid (Echinoidea) from the Jurassic (middle Lias) of Nevada, U.S.A.

W. Jesionek-Szymanska

1970

Article

Acta Palaeontologica Polonica 15(4):411-419

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Taxa discussed in this work:

• Plesiechinus hawkinsi

Taxonomy:

• Plesiechinus belongs to Pygasteridae - Jesionek-Szymanska (1970)
• Plesiechinus hawkinsi belongs to Plesiechinus - Jesionek-Szymanska (1970)