ON RECENT SPECIES OF SPIRASERPULA REGENHARDT, 1961 



63 



U V 



Fig. 10 Spiraserpula singularis sp. nov. From type series. A & B, Two tubes, the second one younger. C, Substratal view of first formed coil 

 showing V-shaped dorsal ridge; a ventral ridge is absent. D, Same, smaller specimen. E, Paratype. F & G, Holotype and radioles. H-L, 

 From whole mount of another paratype: H & I, Two views of worm; J, only available bayonet chaeta; K, L, thoracic uncini; M, anterior 

 abdominal uncini. M-R, From whole mount of another specimen: N, anterior abdominal uncini and flat trumpet chaetae; O-R, Bayonet 

 collar chaetae, two present per side. S-V, Bayonet chaetae from whole mount of third specimen. 



