Depressorotunda seticaudata, Kontschán, 2010

Kontschán, Jen ỏ, 2010, Depressorotunda gen. nov., a new remarkable Uropodina mite genus from South-East Asia with description of four new species (Acari: Mesostigmata), Journal of Natural History 44 (23 - 24), pp. 1461-1473 : 1465-1468

Depressorotunda seticaudata sp. nov.

( Figure 4 )

Material examined

Holotype: female, Malaysia, Sarawak, Mulu , low rain forest, from leaf litter, 24 September 1977, leg. B. Bolton. Paratype: male, Malaysia, Sarawak, Mulu , rain forest, from leaf litter from forest path, 24 September 1977. Leg. B. Bolton. The holotype and paratype are stored in alcohol ( NHM) .

Description

Female. Length of idiosoma 350 µm, width 330 µm. Shape oval, posterior margin rounded.

Dorsal idiosoma ( Figure 4A ). All dorsal setae (c. 17–25 µm) pilose marginally ( Figure 4B,C ), posteriormost setae two to three times longer (c. 45–51 µm) than other dorsal setae. Dorsal shield smooth, without ornamentation.

Ventral idiosoma ( Figure 4D ). Tritosternum not clearly visible. Whole surface smooth, without ornamentation. Sternal setae st1, st2, st3 and st4 short (c. 10–11 µm), smooth and needle-like. Genital shield scutiform, with small spine-like anterior process. Ventral cavity large, almost horseshoe-like, anterior margin can be seen near basis of genital shield, posterior margin reaches to the anus. Position of ventral setae: V1 placed near the basis of the genital shield on the ventral shield, V2 (c. 50 µm) and V4 (c. 37 µm) can be found on the lateral margins of the ventral cavity. V3 and V5 not clearly visible, broken at their bases. All observable ventral setae are long, smooth and setiform. Stigmata situated at the level between coxae II and III. Peritreme R-shaped, with several bends. Tritosternum not clearly visible.

Gnathosoma. Not clearly visible (covered by coxae I).

Male. Length of idiosoma 360 µm, width 330 µm. Shape oval, posterior margin rounded.

Dorsal idiosoma. Surface and chaetotaxy of dorsal shield as for female.

Ventral idiosoma ( Figure 4E ). Sternal shield without ornamentation. Sternal setae smooth, short (c. 10–12 µm) and needle-like. Setae V1 placed near the posterior margin of the genital shield very long (c. 72 µm), reach to the basis of V2. Setae V2 (c. 63 µm), V3 (c. 68 µm) and V5 (c. 35 µm) can be found on the lateral margins of the ventral cavity. Additional V4 (c. 59 µm) setae present and placed in the ventral cavity between the basis of V2 and V3. All ventral setae are long, smooth and setiform. Ventral cavity large, anterior margin can be found near posterior margin of genital shield, posterior margin same as female. Genital shield circular, situated between coxae III. Peritremes as in female.

Gnathosoma. Not clearly visible (covered by coxae I).

Nymphs and larvae. Unknown.

Etymology

The name of the new species refers to the long posteriormost dorsal setae.

Figures

Figure 4. Depressorotunda seticaudata sp. nov. (A–D). female; (E) male. (A) Dorsal idiosoma; (B) posteriormost dorsal setae; (C) anteromedial dorsal setae; (D) ventral idiosoma; (E) ventral idiosoma (male). Scale bars: 100 µm (a), 50 µm (b).