Sigambra wassi Pettibone, 1966 

 Figures 29-3, 4a-j 



Sigambra wassi Pettibone, 1966:186, figs. 17a-f, 18a-e. 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



MAFLA 2210H-6/76 (1 spec), 2210J-6/76 (1 spec, USNM 86981); CTGLF 01- 

 5/78 (1 spec, USNM 86982). 

 Supplementary Material: 



Virginia—Chesapeake Bay, 37°37'N, 76°11'W, 13 m, June 1961 (USNM 30987, 

 1 paratype). 

 DESCRIPTION: 



Length, to 86 mm (previously reported to 70 mm); width, to 3.5 mm 

 (previously reported to 5 mm). Largest specimen complete but frag- 

 mented, with over 200 setigers. Prostomium (Figure 29-4a) with three 

 small, digitiforin antennae; median antenna slightly longer than lateral 

 ones. Palps with minute palpostyles. Dorsal and ventral tentacular 

 cirri small, digitiform, equal in length (Figure 29-4a,b). Dorsal cirri 

 of setiger 1 about twice as long as following ones (Figure 29-4b,c); 

 slightly enlarged basally on setigers 2-5 (Figure 29-4d); foliaceous on 

 middle setigers (Figure 29-4e); and elongate, conical on far posterior 

 setigers (Figure 29-4f,g). Ventral cirri conical, present throughout. 

 Body with wrinkled and areolated integument anteriorly (Figure 29-4a,b), 

 becoming smooth posteriorly. Lateral intersegmental pores (Figure 29- 

 4b) distinct anteriorly, becoming smaller and obscured in intersegmental 

 folds medially, absent posteriorly. Hooked acicular notosetae present 

 from about setigers 23-35, small initially (Figure 29-4e), becoming 

 larger posteriorly (Figure 29-4f). Notopodia with 1-2 internal acicula 

 and one emergent simple seta posteriorly. Neurosetae serrate, tapering 

 to fine tips (Figure 29-4h,i). Shorter neurosetae, located anteriorly 

 within the neuropodial fascicle, with more distinct serrations (Figure 

 29-4j). Pygidium (Figure 29-4g) rounded, smooth, anal cirri absent. 

 REMARKS: The Gulf of Mexico BLM-OCS specimens fit quite well the de- 

 scription of Sigambra wassi by Pettibone (1966:186). The intersegmental 

 pores were not mentioned in the original description, but they were 

 found on the one paratype examined (USNM 30987). 

 PREVIOUSLY REPORTED HABITAT: 11-13 o; sand, mud. 



GULF OF MEXICO BLM-OCS OCCURRENCE: Off Florida and Louisiana (Figure 

 29-3); 16-37 m; silty very fine sand, sandy clayey silt. 

 DISTRIBUTION: Virginia, Gulf of Mexico. 



Sigambra tentaculata (Treadwell, 1941) 

 Figures 29-5, 6a-h 



Ancistrosyllis tentaculata Treadwell, 1941a:l, figs. 1-3. 

 Sigambra tentaculata — Pettibone, 1966:182, figs. 14a-f, 15a-e. 

 Sigambra tentaculata — Gardiner, 1976:121, fig. 9c 



MATERIAL EXAMINED: 



Gulf of Mexico BLM-OCS: 



SOFLA 8-11/80 (5 spec, USNM 86975); MAFLA 161-5/74 (1 spec), 2208G- 



8/77 (6 spec), 2209B-6/76 (1 spec, USNM 86972), 2209C-8/77 (1 spec), 



2210B-6/76 (12 spec, USNM 86973), 2210C-b/76 (9 spec), 2316H-6/76 (1 



29-8 



