Chone americana New Species 



p'igiiri' 17a-l 

 Day. Field, and Montgomery, 



Clioiic n. .s]i. 

 1971: 123. 



Hnl<itn]H .—VSNM 43134; 50 paratypes, 

 USNM 43135. 



DcKcriptioii. — Holotype (Figure 17a), uni- 

 formly pale in alcohol, 26 mm long including 

 branchiae; 8 thoracic and 43 abdominal setiger.s. 

 Branchial lobes semicircular, each with 10 

 radioles united by a web for half their length. 

 Tips of radioles very long and tapered. Ventral- 

 most radioles short with few pinnules or none. 

 Palps short, triangular, abruptly tapered. Lips 

 (Figure 17b) fused ventrally to form a notched 

 triangle. Collar narrowly divided dorsally. very 

 low and smt)oth-edged laterally, slightly wider 

 ventrally but not notched or divided in mid- 

 ventral line. Thorax of eight biannulate setigers. 

 Abdomen tapered with 43 setigers; pygidium 

 pointed. 



Thoracic noto.setae of three types: five or six 

 narrow-winged capillaries (Figure 17g), six to 

 eight paleae with rounded blades and shoi't 

 pointed tips (Figure 17h), and a few slender. 



deeply embedded setae with fine tips barely 

 projecting through skin. Thoracic neurosetae 

 as a row of about five long-shafted hooks (Figure 

 17c, d) with a close-set cap of denticles and a 

 delicate hood over the main fang. Anterior ab- 

 dominal segments with normal winged capil- 

 laries (Figure 17k) in neuropodia and uncini in 

 notopodia. Individual uncini (Figure 17e, f) with 

 short square bases and three rows of four or 

 five teeth above rostrum. Posterior abdominal 

 neuropodia with long slender-winged capillaries 

 (Figure 171). 



Rriiiafks. — Juvenile paratypes may have as 

 few as 6 radioles and the number of abdominal 

 segments may be as low as 30. In these young 

 specimens the pygidium ends in a well-developed 

 caudal filament (FMgure 17a) but intermediates 

 between this and the adult type occur. 



Chone aincrlcuiia is allied to C. fiUc(uiihitu 

 Southern; the juveniles with their long caudal 

 filaments were at first thought to belong to this 

 species although the paleae and abdominal 

 uncini differ. The adult form is closer to C. (hi nevi 

 but the latter has a better developed collar. 



R( rorch. — Common off Beaufort in 19 to 160 

 m (*). 



FAMILY SERPULIDAE 

 Key to genera and species 



2 



2' 



3 



3' 



4' 



Thorax symmetrical with 5-12 .setigers 



Thorax asymmetrical with 3-4 setigers. [Shell small and spirally 

 coiled {Spi)'<>ii)i)iae)] 



Operculum always present; no pinnules on opercular stalk. 

 Thorax with 6-7 setigers iScrjnillnac) 



Operculum absent or poorly developed; pinnules present on 

 opercular stalk. Thorax with 5-12 setigers. [Collar .setae 

 with a separate toothed lobe at base of blade (FilngnuKt)] . 



Opercular stalk with a pair of small wings below operculum . . . 

 Opercular stalk wingless, but .sometimes wrinkled or annulated . 



Collar setae as a few winged capillaries. Operculum as a fiat 

 or conical calcareous plate (PitDintoco-os). [Operculum 

 without three-pronged i)rojections antl usually conical with 

 a dorsal talon] 



Collar setae with a spinulo.se lobe at ba.se of blade. Operculum 

 as a calcareous plate with branching projections (Spiro- 

 branchus) 



2 



14 



F. inipU'.vu 



4 

 5 



P. uiiio'lcanus 



S. (/ifjaiiteKs 



129 



