Pygidium with two short, slender, lateral cirri and one short midventral 

 cirrus. Setae and acicula of setigers 2-5 modified, including solitary, 

 enlarged acicula (Figure 30-46b); 1-2 stout, blunt superior simple setae 

 (Figure 30-46c); 2-3 composite falcigers with narrow bidentate blades 

 (Figure 30-46d); and composite falcigers with short, minutely bidentate 

 blades (Figure 30-46e). Acicula of setiger 1 and from setiger 6 on not 

 enlarged (Figure 30-46f). Setae of medial and posterior regions includ- 

 ing stout, serrate, superior simple seta with cup-like sheath at tip 

 (Figure 30-46g); and several composite falcigers with two terminal teeth 

 in plane perpendicular to long axis of blade (Figure 30-46h,h' ). Phar- 

 ynx extending to setigers 2-4. Proventricle extending from setigers 3-5 

 to 6-9, with about 46 (34-54) closely spaced, indistinct muscle cell 

 rows. 



REMARKS: Specimens in the BLM-MAFLA collections originally identified 

 as Streptosyllis arenae , S_. bidentata and S_. websteri are herein re- 

 ferred to S_. pettiboneae. 



PREVIOUSLY REPORTED HABITAT: 7-11 ra; sand. 



GULF OF MEXICO BLM-OCS OCCURRENCE: Widespread off Florida (Figure 30- 

 45); 11-189 m; coarse to fine-very fine sand, silty fine sand, clayey 

 silt. 

 DISTRIBUTION: East coast of Florida, Gulf of Mexico. 



Genus Streptospinigera Kudenov, 1983 



TYPE SPECIES: Streptospinigera heteroseta Kudenov, 1983a. 



REFERENCE: 



Kudenov, 1983a:84. 



DIAGNOSIS: Prostomium with three antennae. Two pairs of tentacular 



cirri. Dorsal cirri including smooth and articled forms. Ventral cirri 



short. Anterior parapodia with large, knobbed acicula and modified 



setae. Composite spinigerous setae and capillary superior simple setae 



present. 



Streptospinigera heteroseta Kudenov, 1983 

 Figures 30-47, 48a-h 



Streptospinigera heteroseta Kudenov, 1983a:84, figs. 1, 2. 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



MAFLA 2207E-8/77 (USNM 74489, holotype), 2317A-2/78 (USNM 74490, 1 

 paratype). 

 DESCRIPTION: 



Length, to 2.6 mm; width, 0.3 mm. Body slender, thread-like; holotype 

 complete with 23 setigers. Prostomium rounded, with four small, len- 

 tigerous eyes in trapezoidal arrangement, and two crescentic ocular 

 spots near bases of lateral antennae (Figure 30-48a). Median antenna 

 missing, lateral antennae clavate. Palps triangular, fused basally, 

 arising anteriorly on prostomium. Tentacular segment collar-like, cili- 

 ated. Tentacular cirri clavate; dorsal pair about equal in length to 

 lateral antennae, ventral pair shorter. Dorsal cirri long, clavate on 

 setiger 1; cirriform to subulate from setigers 2-5, with 4-5 large, 

 pigmented articles beginning on setiger 6. Ventral cirri subulate, 



30-54 



