Syllis (Typosyllis) sp. A 

 Figures 30-125, 126a-g 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



SOFLA 2E-11/80 (2 spec, USNM 75308; 2 spec, USNM 75312), 4A/C-7/81 (2 

 spec, USNM 75306); MAFLA 2208K-8/77 (1 spec), 2211B-7/76 (1 female 

 stolon), 2211H-7/76 (2 spec), 2315A-8/76 (1 spec), 2528C-8/77 (1 

 spec, USNM 65692, 1 spec), 2528G-8/77 (1 spec). 

 DESCRIPTION: 



Length of one small complete specimen, 1.6 mm; width, to 0.3 mm. Body 

 small, thread-like, with up to 22 setigers. Prostomium rounded with 

 four lentigerous eyes, and two ocular spots near base of palps (Figure 

 30-126a). Median antenna with 16-29 articles; lateral antennae with 6- 

 16 articles. Palps long, slender, triangular. Dorsal tentacular cirri 

 with 18-24 articles, ventral ones with 10-16 articles. Dorsal cirri 

 long and slender, alternating in length, with 5-38 articles anteriorly, 

 3-33 articles medially. Ventral cirri long, digitiform, often extending 

 beyond parapodia. Pygidium with paired anal cirri having 22 articles, 

 plus slender midventral cirrus. Anterior composite falcigers having 

 bidentate blades with strong subterminal tooth and coarse serrations 

 (Figure 30-126b-d). Composite setae of midbody region including 1-3 

 inferior falcigers having greatly enlarged, distally hooked blades with 

 minute terminal tooth and massive subterminal tooth above double row of 

 long, coarse serrations (Figure 30-126e). Blade-length ratios 1.3-1.7:1 

 anteriorly, 0.6-0.8:1 medially, about 0.7:1 posteriorly. Superior sim- 

 ple seta slender, bidentate (Figure 30-126f), present posteriorly. In- 

 ferior simple seta (Figure 30-126g) similar in appearance to blades of 

 inferior composite falcigers, present posteriorly. Pharynx extending to 

 setigers 3-7; middorsal tooth subterminal. Proventricle extending from 

 setigers 4-7 to 6-10, with 24-27 muscle cell rows. Ventricle occupying 

 1-2 setigers. Pharynx 1.2-1.6 times length of proventricle; proventri- 

 cle 2-3 times longer than wide. 



REMARKS: Syllis ( Typosyllis ) sp. A is unique in having inferior com- 

 posite falcigers with massive, distally hooked blades. 



GULF OF MEXICO BLM-OCS OCCURRENCE: Widespread in northeastern Gulf 

 (Figure 30-125); 19-106 m; coarse to fine-very fine sand, silty fine to 

 very fine sand, clayey sandy silt. 



Syllis (Typosyllis) sp. C 

 Figures 30-127, 128a-g 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



SOFLA 4B-7/81 (3 spec, USNM 75305); MAFLA 2211J-7/76 (1 spec, USNM 

 65694; 1 spec); ST0CS HR1-6 7/76 (1 spec, USNM 75230). 

 DESCRIPTION: 



Length, 6.3+ mm; width, to 0.45 mm. Body long, slender; largest speci- 

 men incomplete with 50 setigers. Prostomium rounded, with four small 

 lentigerous eyes, and two ocular spots near base of palps (Figure 30- 

 128a). Median antenna with 18-19 articles, lateral antennae with 5-14 

 articles. Palps triangular, fused basally. Dorsal tentacular cirri 

 with 11-19 articles, ventral ones with 5-11 articles. Dorsal cirri 

 slender, alternating in length, short anteriorly with 5-28 articles, 



30-134 



