454 PROCEEDINGS HELMINTHOLOGICAL SOCIETY VOL. 2, NO. 1 



PHARYNX ABSENT, or so obscure as easily to escape notice (for alternative see page 458) 



Oesophagus with median or posterior bulb or swelling, or both (for alternative see next page) 

 Amphid not known or obscure 

 F oS5 1, anterioTl^fph. set. 0; oesoph. with med. bulb; spinneret 0; bursa pr^jm^iL^otonchium CobMgO 



Spinneret'none- amphid a pore at lips; cepn. set. 2, minute; in beetle larvae (Neoapleetana Steiner 1929) 



Spinneret present; oesoph. without median bulb; bursa none; marine 



Cephalic setae 0; cuticle not annulated; spicula long, 18%. flexible. Molgolaimus Ditlev. 1921 



Cephalic setae numerous, in circlets of 4; cuticle annulated, exc. on head (Stilbonema Cobb 1920) 



Hemispherical cephalic cap suddenly wider than neck, edge set with dots Mitrepharus Linst. 1877 



Hemispherical cephalic cap absent 



Spinneret absent; cephalic setae 0; wings present; in soil; J Litonema Cobb 1920 



Spinneret present (Xuadella ?); ceph. set. present; wings 0, striae uninterrupted; marine 

 Cuticle not annulated, striae none; cephalic setae small 



Neck 8%; cardiac swelling slight, clavate Nuadella Allgen 1927 



Neck under 4%; card, bulb broad; cepb. set. in 3 circlets of 4; am ph. small, near bps..(Catanema Cobb 1920) 

 Cuticle annulated, exc. on head; amphid near lips 



Setae on head, labial 6, ceph. 10; contour of nema serrate; pores lateral (Leptonemella Cobb 1920) 



Setae on head in circlets of 4; contour of nema crenate; pores 0; nema 10 mm (Laxonema Cobb 1920) 



Amphid known 



External amphid not spiral, circular nor elliptical 



Head a hemispherical cap, suddenly wider than neck, edge set with dots Mitrepharus Linst. 1877 



Head not suddenly wider nor cap-like 

 Habitat soil about roots 



Spinneret present; lips 6, long, revolute, flower-like; amph. semicircular; wings 2; ' 9 ' Anthonema Cobb 1906 

 Spinneret absent; lips not long nor revolute; cephalic setae 



Wings pres. ;oesoph. cephaloboid;striaecoarse;amph. transverse.i head-width; ' 9 lotalaimus Cobb 1920 

 Wings absent, striae not interrupted 



Ceph. papill.6, conspic.;am ph. crescentic.head- width back; tail 3%, rounded; cf only Bolbinium Cobb 1920 

 Ceph. papill. tiny; amph. inconspic.,2 head-widths back;tail 6-12%, slender.conoid Alaimus de Man 1880 

 Habitat marine; cephalic setae and spinneret present 

 Ambulatory & body setae absent; nema not crooked 



Wings pres.; amph. shepherd's crook; annules under 300, of tile-like elements; ' 9 ' Ceramonema Cobb 1920 



(cf. Pselionema Cobb 1933) 



Wings 0; amph. a tran verse slit, at lips; pores lateral; nema 2 mm.; d 1 only. ..Leptonemella Cobb 1920 

 Ambulatory & body setae pres.; amph. crook-shape to spiral; nema S-shaped; ' 9 ' 



Oesoph. region hardly swollen; card, bulb faint; cerv. striae alike Notochaetosoma Irwin-Smith 1918 



Oesoph. region swollen, ovoid; oesophageal bulbs 1 or 2; band of cervical 

 striae accentuated, exc. Tristicochaeta falcatum 



Ventral ambulatory adhesion tubes or setae in 3 or 4 rows Tristicochaeta Panceri 1878 



( = DraconemaCobb 1913) 



Ventral ambulatory adhesion tubes or setae in 2 rows Drepanonema Cobb 1933 



( = Chaelosoma Clap. 1863) 

 External amphid spiral, circular or elliptical 

 Female not known; J only, exc. Bolbinium 



Annules 90, prominent ;subdorsal setae 9 prs.;amph. saccate;nema 10%+ wide Eudesmoscolex Steiner 1916 

 Annules or not prominent; subdorsal setae 0; amphid not saccate; nema under 5% wide 

 Spinneret absent; cephalic setae 0; in soil 



Cephalic papillae 6, conspicuous, each on circular base Bolbinium Cobb 1920 



Cephalic papillae or inconspicuous; wings double; oesophagus icephaloboid Litonema Cobb 1920 



Spinneret present 



Wings single, projecting; amphid almost neck width, barely longer than broad Antomicron Cobb 1920 



Wings 0, striae not interrupted laterally 



Pharynx with basal cuticularized ring; amphid monospire (Cricolaimus Southern 1914) 



Pharynx without basal cuticularized ring; cephalic setae in circlets of 4 



Amphid spiral, of 2 winds (Alaimonema Cobb 1920) 



Amphid circular or elliptical 



Head set off by constriction, spherical; cephalic setae 4; amphid on neck Cinctonema Cobb 1920 



Head set off by lack of annules, if at all; ceph. set. many; amph. small, at lips; neck 2% 



Cuticle without annules; head not set off; pharnyx definite; nema 3-4 mm (Catanema Cobb 1920) 



Cuticle with annules exc. on head; pharnyx obscure; nema 10 mm Laxonema Cobb 1920 



Female known 

 Ovary 1 ; spinneret none; wings 0; cephalic setae or papilloid 



Oonad 9 posterior, reflexed; amphid iobscure; cardiac swelling slight; in soil (Alaimus de Man 1880) 



Gonad 9 anterior, outstretched 



Habitat marine; anterior oesophagus fusiform, cardiac bulb massive (Solenolaimus Cobb 1894) 



Habitat soil; oesophagus with median bulb; bursa present lotonchium Cobb 1920 



Ovaries 2 ( = Hemic V cli P hora de Man mi) 



Gonads 9 outstretched; cephalic setae present; marine (for alternative see next page) 

 bpmneret doubtful or absent; striae very fine or seen with difficulty 



Cephalic setae 10, subcephalic 4: amphid multispire (Laimelli Cobb 1920) 



Cephalic setae 4 or 8; amphid circular 



Pharynx none; cardiac bulb broad, valvate; tail setaceous Terschellingia de Man 1888 



Pharynx obconoid; cardiac bulb pyriform, sometimes valvate (Cryptolaimus Cobb 1933) 



opinneret present 



Length of oval monospiral amphid twice its width, equalling head width Disconema Fil. 1918 



Length of amphid not much greater than its width 



Gknd ducts cuticularized , pores ventrad , cerv. & pre-anal ; striae coarse Halaphanolaimus Southern 1914 

 Gland ducts and pores 0; striae fine, usually plain 



