Rhombognathus Trouessart, 1888

Pepato, Almir R. & Silveira, Paulo Sergio Amorim Da, 2015, Two new species of Rhombognathus (Halacaridae, Trombidiformes) from a Mangrove in the northern littoral zone of São Paulo State (Brazil), Zootaxa 3905 (4), pp. 500-510 : 501

Rhombognathus Trouessart, 1888

Idiosoma dark green or black. Dorsal plates well-developed, sometimes fused. Ocular plates usually with two setae and two corneas. Posterior dorsal plates with one or two pairs of setae. Adanal setae on anal plate. Ventral plates often fused. Epimeral plates often with adjunct setae. Adults with two, rarely one pair of pgs. Palp four-segmented, P2 with single dorsal setae, P3 without setae and P4 with three setae. Tarsus I with dorsolateral solenidion and famulus. Tarsus II with a dorsolateral solenidion. Carpite present between end of tarsus and central sclerite. Males with plumose parambulacral setae on tarsus IV. All tarsi with lateral claws only and without ventral setae. Two or three nymphal stages. If only two nymphal stages present, they are the proto- and tritonymph.