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Definition of Class pteridospermopsida
1. Noun. Extinct gymnosperms most of Carboniferous to Jurassic: seed ferns and allies.
Exact synonyms: Pteridospermopsida
Generic synonyms: Class
Group relationships: Class Gymnospermae, Division Gymnospermophyta, Gymnospermae, Gymnospermophyta
Member holonyms: Cycadofilicales, Lyginopteridales, Order Cycadofilicales, Order Lyginopteridales
Generic synonyms: Class
Group relationships: Class Gymnospermae, Division Gymnospermophyta, Gymnospermae, Gymnospermophyta
Member holonyms: Cycadofilicales, Lyginopteridales, Order Cycadofilicales, Order Lyginopteridales
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