ON RECENT SPECIES OF SPIRASERPULA REGENHARDT, 1961 



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Fig. 17 Spiraserpula nudicrista sp. nov. From Bonaire. A, Tube, with granular overlay and longitudinal ridges. B-D, Tube fragments 

 showing unserrated ventral ridge along concave wall and lack of a ridge on the opposite side. E-F Other tube fragments showing a narrow 

 ventral ridge anteriorly, and a smooth and rounded edge to it posteriorly. J, First formed coil, lacking a dorsal ridge. K-L, Two different 

 views of holotype showing prostomial ocellar clusters, as seen through the collar, the ventral longitudinal groove of the abdomen, and 

 extent of thoracic membrane on the left side (K); L, Radioles with a pair of short club-shaped rudimentary opercula and moderately long 

 pinnule-free tips. M & N, Paratype: M, tube with granular overlay, prostominial ocellar cluster of one side, and longitudinal abdominal 

 grooves; N, branchial crown with a pair of short club-shaped rudimentary opercula, and long pinnule-free tips. 



