extending past tips of anterior parapodia. Pygidium with one slender 

 midventral cirrus; lateral anal cirri missing. Acicula enlarged and 

 setae modified in first five setigers; setae including short, stout, 

 superior simple seta (Figure 30-48b); 2-4 composite spinigers with 

 serrate blades (Figure 30-48c); and numerous composite falcigers with 

 short unidentate blades (Figure 30-48d). Acicula slender starting in 

 setiger 6. Setae of medial and posterior regions including hair-like 

 superior simple seta (Figure 30-48e); superior composite spinigers with 

 long blades (Figure 30-48f); superior composite falcigers with long, 

 minutely bidentate blades having basal spur (Figure 30-48g); and infe- 

 rior composite falcigers with short, unidentate blades (Figure 30-48h). 

 Shaft-heads of composite setae homogomph. Pharynx extending to setigers 

 2-4. Proventricle located in setigers 3-5 or 4-6, with 30-33 indistinct 

 rows of muscle cell. Gametes first present from setigers 8-10. 

 REMARKS: Specimens of S. heteroseta were originally referred to the 

 genus Streptosyllis . 



GULF OF MEXICO BLM-OCS OCCURRENCE: Two stations off central Florida 

 (Figure 30-47); 19-29 m; fine-very fine sand, silty very fine sand. 

 DISTRIBUTION: Gulf of Mexico. 



Genus Parapionosyllis Fauvel, 1923 



TYPE SPECIES: Pionosyllis gestans Pierantoni, 1903. 



REFERENCES: 



Fauvel, 1923:289. 



Fauchald, 1977a:83. 



DIAGNOSIS: Prostomium with three antennae and basally fused palps. 



Nuchal organs generally as small ciliated slits between prostomium and 



peristomium. One pair of tentacular cirri. Pharynx armed with single 



dorsal tooth. 



Key to the Gulf of Mexico BLM-OCS Species of Parapionosyllis 



la. Dorsal cirri appearing biarticulate (Figure 30-50a); parapodial 

 glands absent Parapionosyllis sp. B, p. 30-55 



lb. Dorsal cirri not biarticulate; parapodial glands present (Figure 

 30-52a) 2 



2a. Blade-length ratio less than 2:1; superior simple seta in poste- 

 rior region with strong, triangular, subdistal tooth, sometimes 

 accompanied by a small tooth and several rows of serrations (Fig- 

 ure 30-52c) Parapionosyllis longicirrata, p. 30-58 



2b. Blade-length ratio 2-3:1; superior simple seta in posterior region 

 with several prominent, rounded subdistal teeth (Figure 30-54b). . 

 Parapionosyllis sp. A, p. 30-60 



Parapionosyllis sp. B 



Figures 30-49, 50a-e 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 

 MAFLA 2531E-1L/77 (1 spec). 



30-55 



