472 PROCEEDINGS HELMINTHOLOGICAL SOCIETY VOL. 2, NO. 1 



Lips 6, thin; pharynx larger, domed; onchia in posterior chamber (Trilobus Bast. 1866) 



Habitat marine (for alternative see preceding page) 



Wings conspic. ; striae of dots ; ceph . set. ;pharynx denticulate ; post .ovary undev . . Dasylaimus Cobb 1933 

 Wings 0, striae plain, not altered laterally; cephalic setae present; Enoplidae 



Calvarium elaborate, ornate; onchia often present Deontostoma Fil. 1916 



Calvarium not elaborate, sometimes absent 

 Oesophagus crenate towards base; calvarium simple or reduced 



Eyes 0; neck rttapering; calvarium reduced; cervical setae in several rows Stenolaimus Marion 1870 



Eyes with lenses 



Pharynx simple ; calvarium reduced ; neck tapering Nasinema Fil. 1927 



Pharynx with tooth-like processes; calvarium simple; neck icylindroid Phanoderma Bast. 1865 



( = Heterocephalus Marion 1870) 

 Oesophagus not crenate; calvarium absent 



Jaws 3, without mandibles or onchia (Parenoplus Fil. 1927) 



Jaws absent 



The pharynx tapering into oesophagus; cephalic setae 6, cervical small. .Paroxy stamina Micol. 1924 

 The pharynx broad.thin-walled.base truncate with mound ;amph. with pocket Pelagonema Cobb 1894 



(cf. Vasculonema Kreis 1928) 



Amphid known (for alternative see preceding page) 

 External amphid not spiral, circular nor elliptical ; female known 

 Ovary 1 ; amphid not linear 



Gonad 9 outstretched; lips 6, thin, each with 3 parallel-sided cutic. ribs; marine Daptonema Cobb 1920 



(cf. Theristus Bast. 1865) 

 Gonad 9 reflexed 



The ovary posterior; spinneret absent; marine (Rhabdocoma Cobb 1920) 



The ovary anterior, vulva 80%; spinneret present; soil about sugar cane Trischistoma Cobb 1913 



Ovaries 2 

 Gonads 9 outstretched; marine exc. Monhystera 



Habitat soil among roots; amphid a transverse slit; pharynx ovoid Monhj/stera Bast. 1865 



( = M. dintheriana de Man 1885) 

 Habitat marine 



Amphid large, long-oval, on triangular plate, as wide as head; spinneret none. . . .Didelta Cobb 1920 

 Amphid not on special plate 



Mouth ventrad of axis; amphid large, long, "folded 1 Campylaimws Cobb 1920 



Mouth axial; amphid shorter 



Odontia absent; amphid flattened, more or less reniform Margonema Cobb 1920 



Odontia, if present, 6 or 12; amphid crook-shaped or "folded" 



Tail clavate; body less slender; amphid larger Axonolaimus de Man 1889 



Tail conoid; body slender; amphid smaller Ascolaimus Ditlev. 1919 



( = Bathylaimus Ditlev. 1918) 

 Gonads 9 reflexed 

 Habitat freshwater 



Pharynx larger, domed; lips 6, thin; onchia small, in posterior pharynx (Trilobus Bast. 1865) 



Pharynx small, closed; lips 3, rounded; onchium minute, deepset (Tripyla Bast. 1865) 



( = Promononchus Micol. 1923) 

 Habitat marine 



Wings present; amphid a transverse slit almost as wide as head Actinonema Cobb 1920 



Wings absent; amphid with internal pocket (Rhabdocoma ?); Enoplidae (Rhabdocoma ?) 

 Oesophagus crenate towards base 



Pharynx without tooth-like processes; cervical setae in longitudinal rows. . .Stenolaimus Marion 1870 

 Pharynx with 2-3 forward-pointing tooth-like processes; calvarium pres.. .(Phanoderma Bast. 1865) 



( = Heterocephahis Marion 1870) 

 Oesophagus not crenate 

 Calvarium present; onchia often 1-3 



The calvarium elaborate, ornate, relatively short Deontostoma Fil. 1916 



The calvarium a mere band, margin wavy ;external amphid transverse-oval Cylicolaimus de Man 1889 

 Calvarium absent 



Lateral series of setae on neck absent; spinneret absent (Rhabdocoma Cobb 1920) 



Lateral series of setae on neck of few members 



Excretory pore on projection; pharynx definite, iquadrate; testis 1. .. .Paranticoma Micol. 1930 

 Excretory pore not raised; pharynx conoid, often obscure; testes 2 



Gubernaculum present; cf pre-anal ventral supplementary organ tubular Anticoma Bast. 1865 

 Gubernaculum none; cf ventral pre-anal supplementary organ papilloid Anticomopsis Micol. 1930 

 External amphid spiral, circular or elliptical 



Female not known; marine exc. Dintheria (for alternative see next page) 



Spinneret none;ceph.set.4,long;amph.transverse-oval,| head- width, open caudad Dintheria de Man 1921 

 Spinneret present (Neurella, Bognenia ?) 



Nema broad, tapering from head to tail; wings 12-24; amphid spiral Pteronium Cobb 1933 



Nema slender, not widest at head; wings none or few 

 Amphid multispire 



Wing single; cephalic setae 4; amphid broad, of few winds; spinneret(?) Neurella Cobb 1920 



Wings absent; striae not altered laterally 



Onchia 3,at tops apophyses;ceph.set.papilloid;pharynx complex.bulb strong Trogolaimus Cobb 1920 

 Onchia 0; cephalic setae longer; lips flap-like, at least distally 



Lip supports thickened; phar. cyathiform; cf supplements many, chromadoroid Dispira Cobb 1933 

 Lip supports none; pharynx spheroid, on front of head; cf supplements 0. .Dispirella Cobb 1933 

 Amphid circular, elliptical or monospiral 

 Wings strong; amphid circular or monospiral 



Oesoph.compound.wide anteriorly .card.bulb faint ;amph. spiral jannules wide Daaynemella Cobb 1933 



( = Dasynema Cobb 1920) 

 Oesoph. not compound; amphid circular 



The wings.12, of spine-like markings Xenolaimus Cobb 1920 



The wing single, with subordinate lines; amphids joined dorsally (Antomicron Cobb 1920) 



Wings 0; striae not altered laterally 



Onchium spear-like; cephalic setae 10; cephalic cuticle thickened; eyes 2 (Cophonchus Cobb 1920) 

 Onchium none (Nudolaimus ?) 



