RHABDITINAE 43 



11. Teratocephalus de Man, 1876. 



Cuticle transversely striated, the striations usually com. 

 posed of rows of dots, without bristles. Lateral organs, when 

 present, small and spiral. Head may or may not be distinct, 

 and has six movable cuticular flaps or lips, separated by deep 

 furrows. Buccal capsule goblet-shaped, wide anteriorly and 

 narrow posteriorly, and with isolated chitinoid elements. 

 Oesophagus with a posterior bulb not separated by a distinct 

 " neck " from the more or less cylindrical prebulbar swelling. 

 Male with slender spicules. No accessory piece or caudal 

 papillae. Vulva in the middle of the body or slightly posterior. 

 Uterine branches opposed, usually with reflexed ovaries. In 

 the genotjrpe the posterior branch is reduced and without ovary. 



Hab. In soil, on plants or in fresh water. 



Genotype : T. [Anguillula] terrestris (Biitschli, 1873). 



Biitschli, 1873, iVov. Act. k.Leop.-Car. Akad. Naturf., Dresden, 

 xxxvi, 69; de Man, 1876, Tijdschr. Nederl. dierk. Vereen., 

 's Gravenhage and Rotterdam, 137 ; 1884, Diefrei . . . lebenden 

 Nematoden der Niederl. Fauna, 101 ; Micoletzky, 1922, Arch. 

 f. Naturg., Abt. A, Ixxxvii, 298. 



12. Rhabdolaimus de Man, 1880. 



Cuticle with fine transverse striations, without bristles or 

 lateral alae. Lateral organs smaU, inconspicuous. Anterior 

 end bluntly rounded, without lips, papiUae or bristles. Buccal 

 capsule very long and narrow, supported by three slender 

 chitinous rods which converge slightly posteriorly and are 

 connected anteriorly with hook-like or kiiob-like structures. 

 Oesophagus with muscular posterior bulb. Tail long and 

 tapering, with caudal glands and spinneret. Males rare, with 

 stout spicules. Two chitinized thickenings of the cloacal 

 wall represent rudimentary accessory pieces. No caudal 

 papillae or alae. Vulva in middle of body. Uterine branches 

 probably opposed.* Frequently parthenogenetic. 



Hab. Damp soil, sand or fresh water. 



Genotype : R. terrestris de Man, 1880. 



de Man, 1880, Tijdschr. Nederl. dierk. Vereen., Leiden, 59; 

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

 125; Micoletzky, 1922, Arch.f. Naturg., Abt. A, Ixxxvii, 302. 



13. Protrellus Cobb, 1920. 



Cuticle with transverse striations, rather coarse in the 

 female, much finer in the male, and without bristles. Cuticle 

 of neck inflated in the adult only. Lateral organs absent. 

 Lateral fields broad, without alae. Head truncate, with 



* According to de Man, the female organs are apparently unpaired, 

 although extending on either side of the vulva. 



