Polymastiidae
Polymastia invaginata
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Porifera
Class:	Demospongiae
Order:	Polymastiida
Family:	Polymastiidae Gray, 1867
Genera
See text

Polymastiidae is a family of demosponges found in oceans throughout the world. It is the only family in the monotypic order Polymastiida. A useful diagnostic characteristic of members of this family is the presence of numerous surface papillae although this feature is shown by some other sponges.

The following genera are recognised in the family Polymastiidae

• Acanthopolymastia
• Astrotylus
• Atergia
• Koltunia
• Polymastia
• Proteleia
• Pseudotrachya
• Quasillina
• Radiella
• Ridleia
• Sphaerotylus
• Spinularia
• Tentorium
• Trachyteleia
• Tylexocladus
• Weberella

• North East Atlantic Taxa
• Michelle Kelly-Borges & Patricia R. Bergquist (1997). "Revision of Southwest Pacific Polymastiidae (Porifera: Demospongiae: Hadromerida) with descriptions of new species of Polymastia Bowerbank, Tylexocladus Topsent, and Acanthopolymastia gen. nov. from New Zealand and the Norfolk Ridge, New Caledonia" (PDF). New Zealand Journal of Marine and Freshwater Research. 31 (3): 367–402. doi:10.1080/00288330.1997.9516772.^{[permanent dead link‍]}
• WoRMS - Polymastiidae Gray, 1867