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

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Pentamerismus McGregor, 1949


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; c 2, d 2, and e 2 present; seta f 2 present or absent; setae e 2 and f 2 (when present) inserted in marginal position, aligned with c 3, d 3, e 3 and f 3; setae h 2 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 (ps 1-3) 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 v 2, 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 1 c 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 e 2 and f 2 (when present) are inserted in a marginal position, aligned with setae c 3, d 3, e 3 and f 3, instead of the more usual sublateral position aligned with c 2 and d 2.