This paper discusses four peculiar cases of foraminiferal occurrences in a limestone bed of the Pennsylvanian (Myachkovian, upper Moscovian) of the Cantabrian Zone (northern Spain), which raise questions as to their possible interpretation: (1) the true range of the genus Pseudostaffella; (2) the possible marked tendency towards a thickness increase shown by the wall of the genus Putrella; (3) the origin of the apparent deformations observed in part of the fusulines, especially in some Beedeina specimens, here interpreted as alterations probably due to a foraminiferal disease; and (4) the observations made on clusters of recently found fused foraminifera, which invalidate one of the hypotheses so far provided to explain these aggregations while opening perspectives towards new interpretations. A new species, Putrella crassa Villa & Ueno, is introduced.

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