Crossipalpus Smiley, Frost and Gerson, 1996,

Beard, Jennifer J., Seeman, Owen D. & Bauchan, Gary R., 2014, Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales), Zootaxa 3778 (1), pp. 1-157: 22

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Crossipalpus Smiley, Frost and Gerson, 1996


Crossipalpus Smiley, Frost and Gerson, 1996 

Type species. Crossipalpus verticillatae Smiley, Frost and Gerson, 1996  , by original designation.

Diagnosis. All life stages: dorsal opisthosoma with 12 pairs of thinly to broadly lanceolate setae; c 2, d 2, and e 2 present; setae f 2 absent; setae e 2 close to marginal position; setae h 2 similar in size and form to other dorsal setae; palps 5 -segmented, setal formula 0, 0, 0, 1, 3 (1); anterior margin of prodorsum smoothly rounded, without projections/notches; ventral plate absent; 2 pairs of pseudanal setae (ps 1–2) on weakly developed anal plates. Adult female: anterior margin of prodorsum without projections, smoothly rounded, completely concealing the gnathosoma; genital plate membranous, weakly developed; metapodal plates not developed; coxae I without 1 c; trochanters I –IV 1 - 1 -2- 1; femora I –IV 3 - 3 - 2 - 1; genua I –IV 1 - 1 -0-0 (ge I –II with either l′′ or d present); tibiae I –IV 4 - 4 - 3 - 3; tarsi I –IV with or without tc′′. Setae v ′ added to tr IV in adult; v ′ added to tr I –III in deutonymph; l ′ added in protonymph. Solenidia of male much thicker and longer than those of female.

Species. Four species: Cr. gersoni  , Cr. muellerianae  , Cr. raveni  , Cr. verticillatae  .

Hosts and distribution. Casuarinaceae  , Australia.

Remarks. All known Crossipalpus  species have the setal formula for genua I –IV 1 - 1 -0-0. In Cr. muellerianae  and Cr. verticillatae  , the seta present on ge I –II is l′′, but in the two new species, Cr. gersoni  and Cr. raveni  , the seta is d. This difference is an example of how setal counts alone can conceal useful information that only chaetotaxy can present.