FIG. 11. — A in A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera

FIG. 11. — A, Tarphophragma macrostoma (Loeblich, 1942), branch transverse thin section, CEGH-UNC 27539 a; B-E, Jordanopora heroensis Ross, 1963: B, C, oblique thin section trough the colony showing autozooecial chambers, CEGH-UNC 27530 f; D, E, tangential thin section showing autozooecial apertures, rare mesozooecia, and tubules in autozooecial walls, CEGH-UNC 27530 e; F, G, Argentinopora robusta n. gen., n. sp., holotype 27511 c, longitudinal section showing autozooecial chambers, mesozooecia, and acanthostyles. Scale bars: A, B, F, G, 1 mm; C, D, 0.5 mm; E, 0.2 mm.