Autolytus sp. A 



Figures 30-5, 6a-d 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



SOFLA 22D-4/81 (2 spec, USNM 75272); MAFLA 22111-7/76 (1 spec), 2528E- 

 11/77 (1 spec). 

 DESCRIPTION: 



Length, to 6.0 mm; width, to 0.5 mm. Body small, slender. Prostomium 

 rounded, with two pairs of large, lentigerous, contiguous eyes and two 

 ocular spots. Antennae, tentacular and first pair of dorsal cirri 

 moderately long, each having several light-reflecting granules arranged 

 in two lateral rows (Figure 30-6a). Nuchal epaulettes extending to 

 setigers 5-6. Dorsal cirri alternating slightly in length, ranging from 

 0.5-1 times as long as body width; cirrophores of longer dorsal cirri 

 longer than styles. Anal cirri with several indistinct articles. Com- 

 posite falcigers having short blades with distal tooth slightly smaller 

 than subdistal tooth (Figure 30-6b). Superior bayonet-seta (Figure 30- 

 6c) present from setiger 1. Trepan of pharynx with about 22-36 small 

 teeth, all similar in size (Figure 30-6d). Proventricle located in 

 setigers 8-11 or 15-18, with about 25-32 indistinct muscle cell rows. 

 REMARKS: Autolytus sp. A resembles A. prolifer (0. F. Miiller, 1784) in 

 having a similar number of teeth in the trepan. It differs from the 

 latter in having longer nuchal epaulettes. 



GULF OF MEXICO BLM-OCS OCCURRENCE: Three scattered records in north- 

 eastern Gulf (Figure 30-5); 37-53 m; coarse to fine sand. 



Genus Myrianida Milne Edwards, 1845 



TYPE SPECIES: Nereis pinnigera Montagu, 1808. 

 REFERENCES: 

 Imajima, 1966:79. 

 Day, 1967:285. 

 Gidholm, 1967:178 [table]. 

 Fauchald, 1977a:83. 



DIAGNOSIS: Prostomium with three cylindrical antennae; palps fused and 

 ventrally directed. Two pairs of tentacular cirri. Nuchal epaulettes 

 present. Cirrophores present. Bayonet-setae with slender shafts. Seg- 

 mental ciliated bands present. Pharynx sinuous, trepan with varying 

 number of teeth. 



Myrianida sp. A 

 Figures 30-7, 8a-d 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



MAFLA 2211F-11/77 (1 spec), 22UK-11/77 (1 spec), 2528E-7/76 (1 spec, 

 USNM 65675). 

 DESCRIPTION: 



Length, to 18.0 mm; width, to 1.0 mm. Body robust anteriorly. Prosto- 

 mium oval (Figure 30-8a), with four small eyes and 0-2 ocular spots. 

 Antennae and tentacular cirri long, cylindrical. Nuchal epaulettes 

 straight or curving outward, extending to setigers 1-3. Dorsal cirri 



30-15 



