Trhypochthoniellus

van der Hammen, L., 1959, Berlese's Primitive Oribatid Mites, Zoologische Verhandelingen 40, pp. 1-93 : 73

Trhypochthoniellus Willmann, 1928

Trhypochthoniellus Willmann, 1928, p. 3; 1931, p. 104; Grandjean, 1939a, p. 306.

Willmann (1928) created Trhypochthoniellus as a subgenus of Trhypochthonius (type: T. (T.) setosus Willmann, 1928); he thought that the absence of the sensillus pointed to the Malaconothridae , but that other characters justified the relationship with Trhypochthonius . In 1931 Willmann raised Trhypochthoniellus to generic rank.

In fact the trichobothridial regression of the ascendant type is a common character of the Nothroidea ; bothridium and sensillus generally appear at one of the nymphal stages. In the Malaconothridae and in some Trhypochthoniellus species, the sensillus is also absent in the adult stage, but this is only a gradual difference. The chaetotaxy of Trhypochthoniellus is a more important character; I refer to Grandjean (1939a, 1954) and to my 1956 paper.