FIGURES 57–60. 57 in Redescription of the fossil oribatid mite Scutoribates perornatus, with implications for systematics of Unduloribatidae (Acari: Oribatida)

FIGURES 57–60. 57. Posterior of hysterosoma of Scutoribates perornatus Sellnick, 1918 (sample PIN 964/1152), lateral aspect; arrow on presumed posterolateral tectum of notogaster. 58. Same area in lateral cross-section of Unduloribates dianae Behan-Pelletier & Walter 2009. 59. Preanal organ of S. perornatus as seen by transparency (ventral aspect, anterior to top); horizontal arrows point to pair of elongated support rods, vertical arrows to innermost apodemal plate (sample MGCP Ar-84). 60. Interior view of same structure in highly cleared specimen of U. dianae; AN indicates anal valve. Scale bars: 57, 58: 20 µm; 59, 60: 50 µm; 57 is combined from 23 layers; 58–60—from 3–4 layers each.