Pterochthonius Berlese's Primitive Oribatid Mites van der Hammen, L. Zoologische Verhandelingen 1959 40 1 93 Arachnida Pterochthoniidae Pterochthonius Animalia Sarcoptiformes 23 24 Arthropoda genus   PterochthoniusBerlese, 1913, p. 104.  Berlese created Pterochthoniusas a subgenus of Cosmochthonius, but the resemblance of the two is superficial and holds good in the number of dorsal "coupures" only. As mentioned above, Pterochthoniusmust be regarded as an isolated genus. P. angelusis the type and single representative of it.