ON RECENT SPECIES OF SPIRASERPULA REGENHARDT, 1961 



97 



. 5mm 



. 5mm 



0.5 



O 



. 1 mm 



0.01mm 



Fig. 31 Spiraserpula discifera sp. nov. From holotype. A, Fractured tube showing transverse wrinkles, granular overlay, and characteristic 

 sharp crescentic discs on outer surface. B, Tube fragment, with one of the discs fixed to the substratum, adjacent to the tube. C & D, 

 Opposite halves of tube fragment split open to show the ITS: a serrated ventral ridge (in longitudinal view), and a lateral row of transparent 

 crescentic discs. E, Tube fragment with internal serrated ventral ridge and external crescentic discs. F, Worm, showing ventral abdominal 

 groove. G, Anterior part of worm showing thorax, collar and thoracic membrane. H-M, Bayonet chaetae, all from same fascicle. N, 

 Thoracic uncinus. O, Abdominal chaetae. P, Anterior abdominal uncini. 



