ON RECENT SPECIES OF SPIRASERPULA REGENHARDT, 1961 



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Fig. 25 Spiraserpula iugoconvexa sp. nov. Holotype. A, Tube fragment showing irregular surface and peculiar structure with a semilunar 

 opening (? Protulophila). B & C, Views of the opened tube showing the unserrated dorsal ridge, with a somewhat flatened ridge (C, 

 bottom left). D, Tube fragment showing ventral ridge. E-G, Entire holotype, in three parts. E & F, Body showing the dorsal longitudinal 

 groove, the apparently glandular ventral side of the abdomen and its peculiar outpouchings. G, Radioles with operculum on the left and 

 rudimentary operculum on the right. G-J, Four views of the zygomorph operculum with convex distal end. K-N, Bayonet collar chaetae 

 with long slender blade, short unserrated notch and two teeth (seemingly one tooth) on the basal boss. O, Thoracic uncini. P, Anterior 

 abdominal uncini. Q, Bundle of anterior abdominal flat trumpet chaetae. 



