FIG. 6. — Plinthosella magna n in New species of lithistid sponges from the Paleogene of the Ukraine

FIG. 6. — Plinthosella magna n. sp., holotype NHM ZN3; A, B, loose young, still smooth tripodial desmas in top and side views; C, D, typical tripodial strongly tuberculated desmas in top (C) and lateral (D) views; E, details of adult desmas to show character of tuberculation; F, G, choanosomal skeleton in top (F) and lateral (G) views to show its very dense character and nonterminal articulation of desmas. Scale bars: A, B, 100 µm; C, D, 200 µm; E, 50 µm; F-G, 500 µm. All SEM photographs.