462 PROCEEDINGS HELMINTHOLOGICAL SOCIETY VOL. 2, NO. 1 



Mouth cavity iquadrate; onchium minute, close against wall; eyes Anoncholaimus Cobb 1920 

 Mouth cavity twice as deep as wide; dorsal qnch. bent in over pharynx Asymmetrella Cobb 1920 

 Pharynx of more than 1 chamber; large onchium sub ventral 

 Onchium conoid to base of short stylet; phar. quadrate; cf supplements eurystomoid 



Bulbs of oesophagus 5-8, serial, contiguous Bolbella Cobb 1920 



Bulbs of oesophagus none 



Cervical setae long, about 30; cf supplements weakly developed Ledomtia Fil. 1927 



Cervical setae or minute; cf supplements well developed Ewystomina Fil. 1921 



(=Eurystoma Marion 1870 

 =Marionella Cobb 1922) 

 Onchium a long stylet; phar. much deeper than broad; cf an enchelid 



Anterior oesophagus (pharynx ?) narrower, lumen wide Calyptronema Marion 1870 



( = Catalaimus Cobb 1920) 

 Anterior oesophagus not differentiated 



Vestibule set off by row of "comma" markings; pharyng. rings 3 Symplocostomella Micol. 1930 

 Vestibule not set off by a ring or rows of denticles or markings. . Symplocostoma Bast. 1865 

 External amphid spiral, circular or elliptical (for alternative see preceding page) 

 Female not known; marine 



Amphid multispire,big;phar.ribbed,complex;onch.3;cf supplements chromadoroid Pomponemo Cobb 1917 

 Amphid circular or oval (Rhinonema, Doryonchus?) 



Annules of dots & rods.altered laterally ;amph. trans verse-oval Pareuchromadora Stekhoven & Adams 1931 

 Annules none or not ornamented; cephalic cuticle not thickened 

 Cephalic setae 6 



Onchium a minute labial prod Rhinonema Allgen 1927 



Onchium ventral, pharyngeal, slender, lance-like Doryonchus Kreis 1932 



(cf. Symplocostoma Bast. 1865) 

 Cephalic setae 8 or 10 



Oesophagus surrounding phar.; onch. opposed by denticles; amph. long-oval Anaxonchium Cobb 1920 

 Oesophagus ceasing at base of pharynx; denticles 0; amphid smaller, circular; Enoplidae 



Pharynx of 1 chamber; onchium digitate Cophonchus Cobb 1920 



Pharynx of 2 chambers; onchium a slender, subventral stylet Isonemella Cobb 1920 



Female known 

 Ovary 1, anterior; onchium dorsal 



Striae of dots; pharynx cyatholaimoid; '9 Dentatonema Kreis 1928 



Striae none or plain; pharynx not cyatholaimoid 



Pharynx large, open; onchium large, apex far forward; amphid with pocket Pseudodilaimus Kreis 1928 

 Pharynx small or closed, onchium basal or deepset, small 



Gonad 9 reflexed; striae 0; spinneret small; vulva 80%; in soil Trischistoma Cobb 1913 



Gonad 9 outstretched; onchium dorsal; amphid circular 



The pharynx very small; oesophagus strongly developed Prosphaerplaimits Fil. 1918 



The pharynx } head-width, as deep as wide; onch. central; in warm salt springs. . .Anticyclus Cobb 1920 

 Ovaries 2 

 Gonads 9 outstretched; spinneret present; marine 



Amphid not known; striae plain Mononcholaimus Kreis 1924 



Amphid multispire; striae of dots 



Head setose; striae not altered laterally; spiculalong; apophysis absent Comesoma Bast. 1865 



Head less setose; spicula short; gubernaculum with apophysis 



Male ventral pre-anal supplementary organs small, papilloid Parasabatieria de Man 1907 



Male supplementary organs absent Sabatieria de Rouville 1903 



Gonads 9 reflexed 



Habitat soil or fresh water; cuticle without pores; wings 



Amphid multispire; pharynx conoid; spinneret present; cf supplements none Nannonchus Cobb 1913 

 Amphid elliptical, with internal pocket; pharynx not conoid 



Cephalic setae 0; labial papillae in 2 circlets; spinneret usually present Mononchus Bast. 1865 



Cephalic set. 6, jointed; labial papillae 1 circlet; spinneret 0; about roots Cyathonchus Cobb 1933 



Habitat marine and brackish waters 



Nema broad, 16%; wings 50; neck region "collared" ; pharynx narrow (Richtersia Steiner 1916) 



Nema slender, not over 5%; wings exc. Rhinema 12 



Amphid multispire; striae of dots; cuticular pores pres.; vestibule with 12 (6 double ?) ribs 

 Large cf supplement tub ular.anteriorto smallsupplements;nema viviparous Acanthonchus Cobb 1920 



( = Seuratia Ditlev. 1918 

 = Seuratiella Ditlev. 1922) 



Large cf supplement absent, others if tubular small; nema usually oviparous 

 Phar. tubular behind onch.; gubernacula not serrate; cf papill. setose Paracyatholaimus Micol. 1922 

 Phar. cyathiform; gubernacula serrate distally; cf setose papillae none 



Dorsal onchium large, acute, projecting; striae altered laterally Paracanthonchus Micol. 1924 



Dorsal onchium or not projecting; pharyngeal ribs extending to base 



Tail setaceous; onchium small; cf papillae present or not Longicyalholaimus Micol. 1924 



Tail not setaceous 



Dots larger laterally; cf supplements tubular; gubernac. oft joined Praeacanthonchus Micol. 1924 

 Dots not larger laterally; cf tubular supplements 0; gubernacula joined Cyatholaimus Bast. 1865 



( = Necticonema Marion 1870) 

 Amphid circular, elliptical or monospiral 



Wings 12, markings V-shaped; pharyng. bulb stronger dorsad ; amphid circular Rhinema Cobb 1920 



Wings 0; striae plain 



striae pi 



Dorsal pharyng. wall thick, tooth-like; amph. monospire at lips; ceph. set. 4; renette far back 

 Oesoph. glands obscuring junct.intest.;dorsal phar.element uniform, slighter Onchium Cobb 1920 

 Oesoph. glands not prominent; dorsal pharyng. element not uniformly thick, but heavy 



Tooth-like thickening parallel to axis Camacolaimus de Man 1889 



( = Digitonchus Cobb 1920 

 = Acontiolaimus Fil. 1918) 

 Tooth-like thickening bent outward from beginning of vestibule 



Point of "onchium" single Acmaeolaimus Fil. 1918 



Point of Y-shaped "onchium" duplex Ypsilon Cobb 1920 



