ON RECENT SPECIES OF SPIRASERPULA REGENHARDT, 1961 



47 



Fig. 2 Terminology. A & B, Body of worm: a.t., abdominal tori; cap., capillary chaetae; col., collar; col.s., collar chaetae; d.l.g., dorsal 

 longitudinal groove; t.s., thoracic chaetae; t.t., thoracic tori; v.l.g., ventral longitudinal groove. C-G, Bayonet-shaped collar chaetae (after 

 ten Hove & Jacobs, 1984; all same magnification): act., accessory teeth; b.b., basal boss; f.t., few teeth; l.s.b.Jong serrated blade; 

 m.l.s.h., moderately long serrated blade; s.s.b., short serrated blade; s.t., several teeth; u.n., unserrated notch; v.s.dl.b., very short 

 dagger-like blade; v.s.t.b., very short tapered blade. H, Uncini, showing orientation in relation to the body of the worm: a., anterior; p., 

 posterior. 



KEY TO THE KNOWN RECENT SPECIES OF 

 SPIRASERPULA REGENHARDT, 1961 



(See Figure 3 for terminology of ITS) 



1. Tube with either dorsal or ventral internal longitudinal ridge 

 only 2 



Tube with dorsal and ventral internal longitudinal ridges .... 7 



2. Tube with dorsal longitudinal ridge only (Fig. 3, B-E) 3 



Tube with ventral longitudinal ridge only, exceptionally with 

 few isolated teeth (Fig. 3, F) 6 



Dorsal ridge unserrated, shaped like an inverted V (Fig. 3, B) 

 S. singularis sp. nov. p. 62 



Dorsal ridge serrated (Fig. 3, C-E) 4 



Serrations of dorsal ridge deltoid (Fig. 3, C) 

 S. deltoides sp. nov. p. 80 



Serrations of dorsal ridge not deltoid (Fig. 3, D & E) 5 



