Terrestrial nematodes from Jan Mayen Author Allgén, C. A. text Annals and Magazine of Natural History 1953 12 6 665 688 journal article 10.1080/00222935308654469 10811051 Teratocephalus crassidens d e Man . (Fig. 3.) de Man, 1884 , pp. 102-103, pl. xv, fig. 63. Dimensions. -Body-length=O. 550 m m., max. width = 0. 0 1 6 m m., oesophagus = 0.063 m m, tail= 0.045 m m., vulva = 0. 3 8 2 m m., α=34.375, β = 8. 7 2, γ=12.2, V =69.45 per cent.