Fig. 10 in Middle and Late Jurassic tube-dwelling polychaetes from the Polish Basin: diversity, palaeoecology and comparisons with other assemblages

Fig. 10. Serpulid and sabellid polychaetes from the Jurassic of Poland. A. Mucroserpula tricarinata (Sowerby, 1829) (white arrow) and sabellid Glomerula gordialis (black arrow) encrusting a fragment of a shell from the Callovian of Zalas (GIUS 8-3589/14). B. Mucroserpula? sp. encrusting a fragment of a shell from the middle Bathonian of Gnaszyn Dolny (GIUS 8-3730/26); top (B1) and cross-section view (B2). Notice the characteristic pentagonal cross-section (B2) due to the presence of three keels. Scale bars 1 mm.