DORYLAIMINAE 73 



7. Diphtherophora de Man, 1880. 



Syn. Chaolaimus Cobb, 1893 ; Archionchus Cobb, 1913. 



Cuticle unstriated, without bristles or alae. Head without 

 lips or bristles, but with papillae. Lateral organs slit-like 

 or transversely elliptical. Stylet consists of three straight 

 rods, each knobbed behind, one (" ventral ") shorter than the 

 others (" dorsal "), apparently connected anteriorly with a 

 triangular chitinoid cap. Oesophagus swollen behind, but 

 without posterior bulb. Caudal end of male with one or two 

 median preanal papillae. Accessory piece absent. Female 

 genital tubes paired, opposed.* Caudal glands absent ( ?). 



Hab. Soil. 



Genotype : D. communis de Man, 1880. 



de Man, 1880, Tijdschr. Ned. dierk. Vereen., Leiden, v, 62; 

 1884, Die frei . . . lebenden Nematoden d. Niederl. Fauna, 

 128; Cobb, 1893, Agric. Gaz. N.S.W., iv, 821; 1913, Journ. 

 Washington Acad. Sci., iii, 438; Micoletzky, 1922, Arch. f. 

 Naturg., Abt. A, Ixxxvii, 421. 



8, Tylencholaimus de Man, 1876. 



Syn. Xiphinema Cobb, 1913. 



Cuticle externally unstriated, without alae or bristles. 

 Head usually distinct, without lips or bristles but with a 

 crown of papillae. Lateral organs stirrup-shaped. Stylet 

 consists of three rods, fused anteriorly and knobbed posteriorly. 

 Oesophagus swollen posteriorly, occasionally with a bulb. 

 Caudal end of male with a few median preanal papillae. 

 Spicules stout, with a midrib. Accessory piece absent, or 

 two accessory pieces present, closely applied to the spicules. 

 Testis usually single, occasionally paired, opposed, outstretched. 

 Female genital tube iisually single, anterior or posterior; 

 sometimes paired, opposed, reflexed. Caudal glands and 

 spinneret absent. 



Hab. Soil or fresh water. 



Genotype : T. [Tylenchus] mirabilis (Biitschli, 1873). 



Biitschli, 1873, Nov. Act. k. Leop.-Car. Akad. Nattcrf., Dresden, 

 xxxvi, 44; de Man, 1876, Tijdschr. Ned. dierk. Vereen., ii, 

 119; 1884, Die frei . . . lebenden Nematoden d. Niederl. Fauna, 

 132; Micoletzky, 1922, Arch.f. Naturg., Abt. A, Ixxxvii, 423. 



* In Chaolaimus, according to Cobb (1893), the female genital tube is 

 apparently single, anterior and reflexed, passing back beyond the 

 vulva and extending half-way to the anus. His description, how- 

 ever, seems to have been based on an immature and moulting 

 specimen. 



