20-25 muscle cell rows. Ventricle large, convoluted, occupying about 



three setigers. 



REMARKS: This species is similar to Pionosyllis sp. C, but differs from 



the latter in having less strongly bidentate setae without subterminal 



guards, and in having a subterminal pharyngeal t'ooth. Gulf of Mexico 



BLM-OCS specimens were originally identified as Pionosyllis cf. 



ehlersiaeformis in STOCS collections and Pionosyllis uraga in SOFLA 



collections. 



GULF OF MEXICO BLM-OCS OCCURRENCE: One station each off southern Texas 



and southern Florida (Figure 30-69); 54-98 m; fine sand. 



Genus Dioplosyllis Gidholm, 1962 



TYPE SPECIES: Dioplosyllis cirrosa Gidholm, 1962. 



REFERENCES: 



Gidholm, 1962:253. 



Imajima, 1966:88. 



Fauchald, 1977a:82. 



DIAGNOSIS: Prostomium with three smooth antennae, and linguiform, ven- 



trally directed palps. Nuchal ridges present or absent. Two pairs of 



tentacular cirri. Parapodia elongate, with long, smooth dorsal cirri. 



Pharynx with large middorsal tooth, with or without additional small 



marginal teeth. 



Dioplosyllis cf. octodentata Perkins, 1981 

 Figures 30-71, 72a-d 



Dioplosyllis octodentata Perkins, 1981:1087, fig. 4a-h. 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



MAFLA 2211E-2/78 (1 spec, USNM 65670), 2640H-2/78 (1 spec). 

 Supplementary Material: 



Flor ida--Hutchinson Island, St. Lucie County, 10.3 m, T. Perkins ID. 

 (USNM 54508, 1 paratype). 

 DESCRIPTION: 



Length, 2+ mm (previously reported to 8 mm); width, to 0.6 mm. Body 

 short, stout; both specimens anterior fragments only. Prostomium oval, 

 with four small, lentigerous eyes (Figure 30-72a). Lateral antennae 

 long, median antenna missing. Palps long, fused basally, with small 

 diffusely pigmented areas dorsally near base. Nucha organs as small 

 ridges posterior to eyes. Tentacular and dorsal cirri long, smooth. 

 Ventral cirri cirriform, often extending beyond parapodia. Superior 

 composite falcigers with bidentate blades (Figure 30-72b); inferior 

 composite falcigers with tri- to multidentate blades (Figure 30-72c). 

 Shaft-heads of setae with prolonged, distally notched prongs (Figure 30- 

 72d). Pharynx extending to setiger 6, with large, ^ bterminal, middor- 

 sal tooth; smaller marginal teeth not visible. Proventricle extending 

 from setigers 7 to 10-12, with about 34-36 muscle cell rows. 

 REMARKS: BLM-MAFLA specimens approach D_. octodentata in all features 

 except the apparent absence of marginal pharyngeal teeth. The presence 

 of multidentate composite falcigers does not necessarily distinguish 

 these specimens from D. octodentata because setal blades could easily 



30-77 



