ON RECENT SPECIES OF SPIRASERPULA REGENHARDT, 1961 



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Plate 1 Scanning electron micrographs of fractured ends of tubes showing internal structures. A, C & D, Spiraserpula lineatuba (Straughan, 

 1967). B, S. ypsilon sp. nov. 



DIAGRAMMATIC REPRESENTATIONS OF 

 TUBES 



The various arrangements of ITS in the species described are 

 diagrammatically represented in Fig. 3. 



DIAGNOSIS OF SPIRASERPULA Regenhardt, 

 1961 



The original generic diagnosis of Spiraserpula was based only 

 on the tube of its fossil type species, S. Spiraserpula Regen- 

 hardt, 1961. Pillai (1993) provides an emended definition for 

 fossil species based on characters of the tube. However, the 

 recent species described here are distinguishable not only by 

 characters of their tubes but also of the worms themselves, 



