(Figure 23-6c) and one lower pectinate seta (Figure 2S-6d) per parapo- 

 diura. Neurosetae of three kinds: 1) superior simple seta, serrate near 

 tip (Figure 23-6e); 2) three composite falcigers with coarsely serrate, 

 bidentate blades all similar in length (Figure 28-6f); 3) inferior 

 simple seta with bifid tip and serrations below tip (Figure 23-6g). 

 Pygidium with smoothly rounded anal lamella and two long, subulate anal 

 cirri (Figure 28-6h). Pharynx extending to setiger 2. Copulatory 

 structures (?) present between setigers 2 and 3. Parapodial glands 

 observed in setigers 6, 7, 9, and 11-17, with apparent sperm sacs in 

 setigers 8 and 10. 



REMARKS: According to the phylogenetic scheme presented by Westheide 

 (1977a:112-113), this specimen most closely approaches Micro phthalmus 

 aciculata Hartmann-Schroder, 1962. However, it differs from the latter 

 in lacking eyes, and in having pectinate notosetae, simple neurosetae, 

 and fewer composite neurosetae. 



GULF OF MEXICO BLM-OCS OCCURRENCE: Single record off Alabama (Figure 

 28-5); 35 m; medium sand. 



Microphthalmus hamosus Westheide, 1982 

 Figures 28-7, 8a-f 



Microphthalmus hamosus Westheide, 1982b:189, figs. 1-3. 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



MAFLA 14E-5/74 (2 spec), 2316G-8/76 (1 spec, USNM 71778), 2424A-2/78 

 (1 spec). 



Supplementary Material: 



Gulf of Mexico — off Tampa Bay, Florida, IEC Sta. 723TB 003-004, Jan. 

 1980, 27°37.1'N, 82°54.0'W, 12 ra, sand (1 spec). 

 DESCRIPTION: 



Length, to 7.2 mm (previously reported to 3.6 mm); width, to 0.9 mm 

 (previously reported to 0.75 mm). Body broad, dorsoventrally flattened, 

 tapering abruptly anteriorly and gradually posteriorly. Complete speci- 

 mens with up to 64 setigers. Prostoraium triangular, with subulate 

 lateral antennae arising raidanteriorly (Figure 28-8a). Palps inserted 

 anteroventrally. Eyes and median antenna absent. Nuchal organs as 

 small, rounded lobes near posterolateral borders of prostomium. Tentac- 

 ular segments distinct dorsally, tentacular cirri subulate, third dorsal 

 pair longest. Parapodia subbiramous (Figure 28-8b), notopodia small, 

 with one (occasionally two) small pectinate setae (Figure 28-8c). Dor- 

 sal cirri slender, extending past tips of neurosetae. Neuropodia elon- 

 gate, with blunt to conical acicular lobe, ventral cirri arising near 

 tip. Neurosetae of first 4-6 setigers with short, smooth, hooked blades 

 (Figure 28-3d), barely protruding from tips of neuropodia. Neurosetae 

 of subsequent segments longer, with finely serrate, minutely bidentate 

 blades (Figure 28-8e), blade-length ratio 2.3-4.8:1. Pygidium with two 

 large, flattened, spiraled anal lamellae (Figure 28-8f); anal cirri not 

 observed. Pharynx extending to setigers 10-14. 



REMARKS: Westheide (1982b: I 91) noted a commensal relationship between 

 M. hamosus and the sipunculid Sipunculus nudus. He postulated that 

 several morphological features of M. hamosus , including relatively large 

 body size, loss of the median antenna, dorsolaterally directed anterior 

 neur.)podial hooks, flat dorsum, and a suction cup-shaped anal lamella 



28-U 



