78 



T.G. PILLAI AND H.A. TEN HOVE 



Table 16 S. nudicrista sp. nov. Some data on two specimens from 

 Curacao. 





Specimen 1 



Specimen 2 



Width of thorax 



0.5 mm 



0.6 mm 



Length of radioles 



2.1 mm 



2.6 mm 



Pinnule-free tips (Figs.l7L,M) 



short 



short 



No. of radioles (L/R) 



7/8 



9/8 



No. of thoracic chaetal tufts (L/R) 



9/7 



8/6 



Thoracic membrane ends 



?/? 



4/4 



Length of abdomen 



? 



9.7 mm 



No. of abdominal segments 



? 



about 60 



paratype 1 showed a slightly concave to asymmetrical cross- 

 sectional edge to the ventral ridge, and a few isolated teeth in 

 the location of the dorsal ridge, somewhat similar to the 

 condition in S. paraypsilon. There is also some similarity in 

 the collar chaetae. 



ETYMOLOGY, nudus (L) = unadorned; crista = crest, ridge. 



Habitat and distribution. S. nudicrista is a shallow water 

 cryptic species inhabiting coral reefs. It has hitherto been 

 collected from Bonaire and Curacao. 



Spiraserpula sp. 

 (Fig.19.A-C) 



Material examined. 



Curasao (Neth. Ant.): Piscadera Baai, outer bay in front of 



CARMABI, muddy reef, many sand spots, about 40 m, from 



dead corals, legit H.A. ten Hove, 9.vi.l970, Stn. 2054B (3 



empty tubes, and some abdominal fragments, ZMA V. Pol. 



3883). 



Description. Tubes are white, circular in cross-section. An 



erect portion shows a granular overlay, and an encrusting 

 sponge at its base (Fig. 18, A). ITS characteristic of this genus 

 are present in the coiled parts, and consist of an unserrated 

 dorsal ridge and a serrated ventral ridge. The dorsal ridge is 

 transparent, somewhat high, and has a smooth, somewhat 

 T-shaped edge; it is spiral, on a columella-shaped axis in the 

 spiral proximal portions of the tube (Fig. 18, B,C). The 

 available portions of the worms were inadequate to assign the 

 material to any of the other Caribbean species or a new 

 species. 



Spiraserpula vasseuri sp. nov. 

 (Figs. 20, A-H;21, A-K; 3, J) 



Helmut Zibrowius requested (pers. comm.) that the material 

 on which he based his preliminary description of the present 

 species in an unpublished manuscript be examined, and that 

 it be included in this paper if it belonged to the present group. 

 ITS are indeed present in this species, and its description 

 follows: 



Material examined. 

 Europa Island (Mozambique Channel): North Reef, Gabriel 

 Cove grotto, 55 m, on oysters, legit Pierre Vasseur, scuba 

 diving, 28.xii.1965 (HOLOTYPE: USNM 46475, 6 

 PARATYPES USNM 46476). 



Type locality. Europa Island. 



Description. 



tubes: The colour is mostly whitish, with a very faint pinkish 

 to orangish tinge seen in places at certain angles of illumina- 

 tion. They are sinuous, coiled and bonded together, espe- 

 cially at their bases. A granular overlay is present. The 

 anterior portions are squarish to trapezoidal in cross-section 

 (Fig. 20, A-C). The dorso-lateral angles may be incompletely 

 developed in places and represented by a pair of incomplete 

 longitudinal ridges; an additional incomplete ridge may be 



. 5mm 



Fig. 19 Spiraserpula sp. A-C, Three specimens from Curacao. A, Erect part of tube with encrusting sponge on its base. B, A tube opened to 

 show spiral dorsal ridge in its first formed coil. C, Aggregation of tubes opened to show variations of dorsal ridge. 





