Sabellids and serpulids (Polychaeta sedentaria) from the type Maastrichtian, the Netherlands and Belgium

Calcareous tubes of the sabellid genus Glomerula and of the family Serpulidae (subfamilies Serpulinae and Spirorbinae) rank amongst the commoner, highly diverse biota of the type Maastrichtian strata. These cover the sequence from the upper Beutenaken Member (Gulpen Formation) up to and including the Meerssen Member (Maastricht Formation). Of the 40+ taxa of calcareous worm tubes found in this interval, the commonest ones are described and illustrated in the present paper, which also comprises a revision of data published in 2005.