Observations on the ‘‘ tenuis group’ ’ (Eutardigrada, Macrobiotidae) and description of a new Macrobiotus species Author Guil, Noemí Author Guidetti, Roberto Author Machordom, Annie text Journal of Natural History 2007 2010-12-02 41 41 - 44 2741 2755 http://dx.doi.org/10.1080/00222930701742637 journal article 10.1080/00222930701742637 1464-5262 5233498 Macrobiotus hyperonyx ( Figures 4D , 5C ) Buccal tube has a clear bend in its anterior portion (just after the mouth opening). At this level, the animal has a large dorsal tooth on the inner surface of the buccal tube ( Figure 5A, C ), which was not cited in the original description ( Maucci 1982 ). In lateral view, the ventral portion of the buccal tube is shorter and ends at the stylet sheaths. Figure 5. Bucco-pharyngeal apparatus (arrows indicate large dorsal tooth). (A) Macrobiotus hyperonyx , lateral view (paratype); (B) M. ariekammensis , lateral view; (C) M. hyperonyx , dorsal view (paratype); (D) M. ariekammensis , dorsal view; (E, F) M. caelicola (paratypes): (E) dorsal view; (F) lateral view. (A, C) Phase contrast microscopy; (B, D–F) differential interference contrast microscopy. Scale bars: 7 mm. Unlike the original description, the buccal armature comprises a posterior band of small teeth (transverse crests absent).