Odontosyllis cf. octodentata Treadwell, 1917 

 Figures 30-77, 78a-e 



Odontosyllis octodentata Treadwell, 1917:257, pi. 1, figs. 1-3. 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 

 MAFLA 2211F-7/76 (1 spec). 

 Supplementary Material: 



Florida — Dry Tortugas, A. Treadwell ID. (AMNH VI-1914-973, holotype). 

 DESCRIPTION: 



Length, 7.0+ mm (previously reported to 40 mm); width, 1.0 mm (previous- 

 ly reported to 2.5 mm). Body fairly large, incomplete with 30 setigers. 

 Prostomium rounded anteriorly, hilobed posteriorly; with four large, 

 lentigerous eyes, and two ocular spots at base of palps (Figure 30-78a). 

 Lateral antennae slightly longer than palps, median antenna about three 

 times as long as lateral antennae. Palps irregularly lamelliform, about 

 as long as prostomium. Nuchal organs as semicircular, faintly pigmented 

 ridges along posterior border of prostomium. Occipital flap large, 

 semicircular. Tentacular cirri long, smooth. Dorsal cirri long ante- 

 riorly, thereafter alternating long and short. Ventral cirri auricular, 

 rounded anteriorly, pointed posteriorly. Composite falcigers numerous, 

 with short, bidentate blades and fimbriated sheath connecting blade to 

 shaft-head (Figure 30-78b,c). Acicula distally constricted, with sever- 

 al rows of denticles surrounding small conical tip (Figure 30-78d). 

 Pharynx divided into anterior section and more muscular posterior sec- 

 tion with ventral arc of seven recurved teeth and two pointed lateral 

 plates (Figure 30-78e). Proventricle with about 62 closely spaced 

 muscle cell rows. 



REMARKS: This specimen differs slightly from the holotype of 

 Odontosyllis octodentata in having blades of superior setae with smaller 

 teeth, and in having a longer median antenna than that figured by 

 Treadwell (1917:pl. 1, fig. 1). In addition, Treadwell reported the 

 pharynx (now missing from the holotype) as having a ventral row of eight 

 teeth. 



PREVIOUSLY REPORTED HABITAT: None reported. 



GULF OF MEXICO BLM-OCS OCCURRENCE: One station off central Florida 

 (Figure 30-77); 43 m; coarse sand. 

 DISTRIBUTION: Gulf of Mexico. 



Odontosyllis sp. A 



Figures 30-79, 80a-e 



MATERIAL EXAMINED: 



Gulf of Mexico BLM-OCS: 



MAFLA 2531J-9/77 (1 spec, USNM 89881). 



DESCRIPTION: 



Length, 8.0+ mm; width, 1.0 mm. Body fairly large, robust, incomplete 



with 42 setigers. Prostomium rounded anteriorly, bilobed posteriorly, 



with four large, lentigerous eyes, and two minute ocular spots at base 



of palps (Figure 30-80a). Median antenna long, arising between eyes; 



lateral antennae arising from anterior margin of prostomium. Palps 



triangular, about as long as prostomium. Nuchal organs as pigmented, 



crescent-shaped ridges along posterior edge of prostomium. Occipital 



30-85 



