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Reference: R.H. Denison, 1964. Fieldiana: Geol. 13 (5)
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Article

Denison, R.H. 1964. The Cyathaspididae: A Family of Silurian and Devonian Jawless Vertebrates. Fieldiana: Geol. 13 (5), 24 Apr 1964: 309-473. ≡

New: Original name, rank & spelling

†Pionaspis (Genus) Denison, 1964Page: 385 ("new genus").

New: Original name, rank, combination & spelling

†Pionaspis acuticosta (Species) Denison, 1964Page: 388 ("new species"), figs. 129-130.
†Vernonaspis sekwiae (Species) Denison, 1964Page: 383 ("new species"), figs. 100C, 123-124.

New: Subsequent spelling

†Irregulareaspis stensioi (Species) Zych, 1931Page: 402 ("Zych").

New: Description/Diagnosis in English

†Pionaspis (Genus) Denison, 1964Page: 385-386 ("Diagnosis").
†Vernonaspis sekwiae (Species) Denison, 1964Page: 383 ("Diagnosis").
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Last updated: 21 Sep 2025