(Figure 30-56d) and bidentate inferior simple seta (Figure 30-56e). 

 Acicula with rounded tips and subdistal cleft (Figure 30-56f). Pharynx 

 extending to setigers 6-10 with medial tooth located at setiger 6 (5-9). 

 Proventricle extending from setigers 7-12 to 9-16, with 21 (19-23) 

 muscle cell rows. Gametes of one mature specimen present from setiger 

 17, natatory setae from setiger 18. 



REMARKS: Opisthodonta sp. A was confused in BLM-MAFLA collections with 

 various species of Eusyllis and Pionosyllis; it represents a new species 

 which is being described by Kudenov. 



GULF OF MEXICO BLM-OCS OCCURRENCE: Common off northwestern Florida 

 (Figure 30-55); 10-189 m; coarse to fine-very fine sand, silty fine to 

 very fine sand. 



Opisthodonta sp. B 



Figures 30-57, 58a-e 



Pionosyllis cf. uraga — Day, 1973:33, fig. 4k-m [Not Imajima, 1966]. 

 Pionosyllis sp. — Gardiner, 1976:137. 

 Pionosyllis uraga — Perkins, 1981:1108. 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



S0FLA 16C-7/81 (2 spec, USNM 75296); MAFLA 18H-5/74 (2 spec), 2211F- 

 7/76 (1 spec), 25231-9/77 (1 spec), 2531-6/75 (1 spec, USNM 55824), 

 2645F-1L/77 (5 spec), 2853F-8/77 (1 spec). 

 Supplementary Material: 



North Carolina — off Beaufort, 34°19'N, 75°56'W, 130 m, J. H. Day coll., 

 as Pionosyllis cf. uraga (1 spec, USNM 51071). 



Flor ida--IIutchinson Island, St. Lucie County, T. H. Perkins ID, as 

 Pionosyllis uraga , 10 m (1 spec, USNM 54519), 10.6 m (1 spec, USNM 

 54520), 10 m (2 spec, USNM 54521). 

 DESCRIPTION: 



Length, 5.0+ mm; width, to 0.8 mm. Body moderately long, stout anteri- 

 orly, slender posteriorly; all specimens incomplete with up to 42 seti- 

 gers. Prostomiura rounded, with four lentigerous eyes, with or without 

 ocular spots at base of palps (Figure 30-58a). Antennae smooth, median 

 antenna longer than prostomiura plus palps. Palps large, directed ven- 

 trolaterally. Tentacular cirri smooth; dorsal pair about twice as long 

 as body width, ventral pair shorter. Dorsal cirri smooth, slender, at 

 least as long as body width. Ventral cirri auricular, not fused to 

 parapodial lobes. Superior setae of anterior region including 2-4 (1-7) 

 long-bladed, spiniger-like composite setae with minutely bidentate tips 

 (Figure 30-58b). Anterior setal fascicles with numerous composite fal- 

 cigers having short, minutely bidentate blades (Figure 30-58c) surround- 

 ed by broad hood (Figure 30-58c'). Teeth of falciger blades becoming 

 more distinct in midbody region (Figure 30-58d) and much stronger in 

 inferior position of posterior setal fascicles. Inferior simple seta 

 stout, bidentate, present posteriorly. Acicula with rounded tips and 

 subdistal flange (Figure 30-58e). Pharynx extending to setiger 12 (Ll- 

 17), with medial tooth (sometimes difficult to see) located at setiger 7 

 (5-10). Proventricle extending from setigers 12-16 to 18-25, with 26 

 (24-29) muscle cell rows. Gametes present beginning In setigers 29-30 

 of Florida specimens. 



30-64 



