SCHEMM-GREGORY, M. A new species of Filispirifer (Brachiopoda: Delthyridoidea) from the Dra Valley, Morocco (Lower Devonian). Zootaxa, Auckland, New Zealand, v. 1739, n. 1, p. 53–68, 2008. DOI: 10.11646/zootaxa.1739.1.4. Disponível em: https://mapress.com/zt/article/view/zootaxa.1739.1.4. Acesso em: 1 may. 2025.