POLYCHAETE WORMS, PART 1 



ne C, neuropodial cirrus 



ne Li, neuropodial ligule 



ne S, neurosetae 



no, notopodium or dorsal ramus of 



parapodium 

 no Li, notopodial ligule 

 no S, uotosetae 

 nu E, nuchal epaulette 

 nu F, nuchal fold 

 nu H, nuchal hood 

 nu O, nuchal organ 

 nu T, nuchal tubercle 

 oc An, occipital antenna 

 oc P, ocular peduncle 

 o R, oral ring 

 ov, ovary 



p La, posterior lamella 

 pa, palp 

 pap, papilla 

 pi, pinnule 



post L, postsetal lobe or lip 

 post Pap, postsetal papillae or podial 



fringe 

 pr, prostomium 



pre L, presetal lobe or lip 



prob, proboscis 



prob O, proboscideal organs 



ro, rosette organ 



s S, swimming setae 



sem R, seminal or sperm receptacle or 



pouch 

 set, setigerous segment or "setiger" 

 set Lo, setigerous lobe 

 st, style of dorsal cirrus 

 st}', stylodes of parapodia or parapo- 



dial fringe 

 sub F, subpodal flange or ventral pad 

 sub Pap, subpodal lateral papilla or 



ventral cirrus 

 t C, tentacular cirrus 

 t S, tentacular segment 

 t Pa, tentacular palp 

 to, tooth 

 V, ventral 



V C, ventral cirrus or neurocirrus 



V Pap, ventral or stomach papillae or 



ventral fringe 



V t C, ventral tentacular cirrus 



Class Polychaeta 



Key to the Families of Polychaeta from New England: 

 Aphroditidae through Trochochaetidae 



1. Body transparent. Exclusively pelagic 2 



Body opaque. Not exclusively pelagic 4 



2. Parapodia uniramous; with foliaceous dorsal and ventral cirri. Eyes enor- 



mous or absent 3 



Parapodia biramous, each ramus bordered by flattened finlike membranes 

 or pinnules, without external setae; without dorsal and ventral cirri. 

 Prostomium and fused tentacular segment with a pair of small eyes, a 

 pair of diverging, flattened anterior antennae or frontal horns, and a 

 large pair of tentacular cirri (figs. 24, 25) .... Toinopteridae (p. 94) 



3. Prostomium small, suboval, with 4-5 antennae, with a pair of enormous 



spherical eyes with globular lenses. Parapodia well developed with setae 



numerous, long, capillary (figs. 22, 23) Alciopidae (p. 91) 



Prostomium conical, without antennae, with prominent nuchal organ, 

 without eyes. Parapodia vestigial with setae lacking or with few short 

 acicular setae (fig. 26) Typhloscolecidae (p. 98) 



4. With projecting parapodial setal lobes supported by internal acicula . . 5 

 Without projecting parapodial setal lobes, without internal acicula; para- 

 podia biramous, with conical or filiform postsetal notopodial lobes, with 

 or without neuropodial postsetal lobes; setae simple. Prostomium sub- 

 conical, with pair of nuchal organs. Without tentacular cirri or tentacu- 

 lar palps. Branchiae dorsal to notopodia, simple, straplike or wide 



