Pentamerismus McGregor, 1949

Beard, Jennifer J., Seeman, Owen D. & Bauchan, Gary R., 2014, Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales), Zootaxa 3778 (1), pp. 1-157 : 89

Pentamerismus McGregor, 1949

Type species. Tenuipalpus erythreus Ewing, 1917: 152 , by original designation.

Diagnosis. All life stages: dorsal opisthosoma with 12–13 pairs of setae; c2, d2, and e2 present; seta f2 present or absent; setae e2 and f2 (when present) inserted in marginal position, aligned with c3, d3, e3 and f3; setae h2 similar in size and form to other dorsal setae; palps 5-segmented, palp setal formula variable 0-0/1-0-1/2-3(1); immature stages with anterior margin of prodorsum smoothly rounded, without projections/notches; gnathosoma not concealed by prodorsum; ventral plate absent; three pairs of pseudanal setae (ps1-3) on weakly to well developed anal plates. Adult female: anterior margin of prodorsal shield with a median notch forming 1 pair of lobes anterior to setae v2, or smoothly rounded; gnathosoma completely exposed, not concealed by anterior margin of prodorsum; genital plate weakly to well developed, membranous; metapodal plates usually present; coxae I with 1c present or absent. Solenidia of male of similar thickness and length to those of female.

Remarks. Pentamerismus is almost identical to Aegyptobia , except that setae e2 and f2 (when present) are inserted in a marginal position, aligned with setae c3, d3, e3 and f3, instead of the more usual sublateral position aligned with c2 and d2.