FAMILY CHAETOPTERIDAE 

 Key to genera and species 



1 Notopodia of middle region bilobed or trilobed. Tube often 



horny and ringed 2 



r Notopodia of middle region never bilobed. Tube neithei- horny 



nor ringed 3 



2 A pair of minute tentacular cirri as well as large grooved 



palps iPlniUocIiactoptcriis). Middle region of 7 or more 



segments. Tube horny, often branching P. sacidlis 



2' No tentacular cirri, only a pair of grooved palps. Tube horny, 

 ringed, solitary (SpiocJiactopto-iis). Middle region with 

 about 20 segments. [Eyes present] S. (■(istannii (inihitiix 



•i Middle region of five segments, the last three with notopodia 



fused to form large paddles. Palps much shorter than 



anterior region iCIiaetopto-ns) C. raridpcddfut^ 



3' Middle region of less than five segments, bearing separate, 



fingerlike notopodia, very like those of posterior region. 



Palps long (MrKoelKK taptf riis). [Middle region of three long 



segments] M. tdtilori 



Phyllochaetopteriis socialis Claparede, 1870 



Phjlllorhactoptcriis socialii<. - Fauvel, 1927: 84, 

 Fig. 30 a-1. - Day. 1967: 525, Fig. 22.1. h-r. 



fif-corf/.s.— Off Beaufort in 20 m (*). 

 DiKtributidii. — Cosmopolitan in temperate 

 and tropical seas; intertidal to 100 m. 



Spiochaetopterus costarum ociilotus 

 Webster, 1879 



Sltidchiictopto'iis oculatus Webster, 1879: 47, 

 pi. 8: Fig. 98-102. - Hartman, 1945: 35. - 

 Barnes, 1964: 397, Fig. 1-4. 



Spidcliaetoptcr/in costdrinn oriilatHx. - Gitay, 

 1969: 15. 



Dcficriptiot). — Body slender, up to 60 mm 

 long; dark ventral patch from setiger 6 to 7, 

 white patch from setiger 7 to 9. Prostomium 

 oval, eyes dark, conspicuous. Buccal segment 

 large, fleshy, collarlike; palps long, colorless. 

 No tentacular cirri. Anterior region of nine 

 uniramous flattened setigers. A single stout 



l.irnwn cutting seta in fourth foot. Middle region 

 of about 20 segments each with simple club- 

 shaped notopodia. Tube long, slender, translu- 

 cent, annulated. Animal solitary, living in 

 sandy mud. 



R< inai-ks. — All the specimens dredged off 

 Beaufort were juveniles, with very delicate 

 transparent tubes which lacked annuli, so that 

 it would appear that these develop with age, as 

 the tube thickens. .Juveniles as small as 5 mm 

 already had the characteristic dark patch on 

 the ventrum of setiger 6. All specimens except 

 one had conspicuous eyes. The smallest speci- 

 mens only had three or four segments in the 

 middle region, but the number increases rapidly 

 with the length of the worm. 



According to Barnes, the main difference 

 between S. costarxDi costni-xni and S. costann)! 

 ociildtHs is that S. cdstarinu caxtarum uses 

 only one mucus bag to collect food particles, 

 while S. cof^taruiu ocidatiis uses eight or more. 



Records. — Cape Hatteras area to Beaufort 

 on sheltered banks and below low tide (3, 11, 13, 

 18, *). 



Distribntii))!. — Massachusetts to the Gulf of 

 Mexico; intertidal and shallow dredgings. 



79 



