Genus Biemna Gray, 1867 Diagnosis sensu Hajdu & van Soest 2002: Massive, cup-shaped or tubular sponges, with uneven surface. Plumose or plumoreticulate choanosomal skeleton, with variable development of spongin fibres cored by (subtylo-) styles of a single size, occasionally replaced by oxeote spicules; ectosomal skeleton made up of brushes of megascleres making the surface often shaggy; microscleres include sigmata, raphides, microxeas, commata, microstrongyles and spheres.

Published as part of Cristobo, Javier, Almón, Bruno, Pérez, Jacinto & Ríos, Pilar, 2024, A new species of the genus Biemna Gray, 1867 (Porifera: Biemnidae) from shallow waters of the Northwestern Iberian coasts, pp. 121-132 in Zootaxa 5446 (1) on page 123, DOI: 10.11646/zootaxa.5446.1.7, http://zenodo.org/record/11084687