Polymastiida is an order of sea sponges.
Taxonomy and history
The order Polymastiida was erected in 2015 to accommodate the demosponge family Polymastiidae, previously placed in the now-defunct paraphyletic order Hadromeridam, and was then considered monotypic. A second family in the order, Spinulariidae, was erected in 2026 to accommodate the deep sea genera Spinularia, Acanthopolymastia, Pseudotrachya, and Tentorium.
Families The order Polymastiida includes the following families: Polymastiidae Gray, 1867 Spinulariidae Santín & Brandt, 2026
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