Nenteria trisetosa, Kontschán, 2010

Kontschán, J., 2010, New And Little Known Uropodina Species From Brazil (Acari: Mesostigmata), Acta Zoologica Academiae Scientiarum Hungaricae 56 (4), pp. 317-334 : 326-327

Nenteria trisetosa sp. n. ( Figs 25–32 )

Diagnosis. Most dorsal setae smooth, short and needle, except I2, I3 and I4, four times longer than other dorsal setae and their margins apically pilose. Dorsal, marginal and ventral shields smooth, sternal region ornamented by several oval pits near the basis of genital shiel. Genital shield with bifurcate anterior process. Peritremes hook-form.

Material examined. Holotype : Female. Brazil, Itatiaia National Park , leaf litter from rain forest, 27.05.1992 leg. J. BALOGH. Paratypes: two females . Locality and date same as holotype .

Description. Female. Length of idiosoma 600–610 µm, width 510–540 µm (n = 3). Shape oval, posterior margin rounded.

Dorsal idiosoma ( Fig. 25 ). Marginal and dorsal shields completly separated. Most of dorsal setae smooth, short (c. 11–16) and needle, except I2, I3 and I4, which four times longer (c. 44–48) than other dorsal setae and their margins apically pilose. Marginal setae similar in shape and length to dorsal setae. Ornamentation on marginal and dorsal shields absent.

Ventral idiosoma ( Fig. 26 ). Surface of sternal and ventral shields mainly smooth, only a few oval pits can be found near the posterior margin of genital shield on intercoxal region. Sternal setae short (c. 9–11), smooth and needle-like. Ventral setae similar in shape and length to sternal setae. Position of sternal and ventral setae illustrated on Fig. 26 . Stigmata situated between coxae II and III. Peritremes hook-like in shape. Genital shield scutiform, with some oval pits and a long, bifurcated anterior process ( Figs 27–29 ). Base of tritosternum narrow, tritosternal laciniae subdivided into two smooth and one serrate branches ( Fig. 30 ).

Gnathosoma ( Fig. 31 ). Corniculi horn-like, internal malae and paralaciniae smooth. Hypostomal setae are the follows: h1, long, smooth and placed near the anterior margin of gnathosoma, h2 smooth and three times shorter than h1, h3 smooth and as long as h2, h4 1.5 times longer than h1, with serrate margins. Epistome not clearly visible. Chelicerae without nodes, its shape is illustrated in Fig. 32 . Palp with smooth setae.

Male, nymphs and larvae are unknown.

Etymology. The name of the new species refers to the three pairs of long setae on dorsal shield.

Remark. The presence of three pairs of long and pilose dorsal setae between the numerous short and needle-like setae is an unusual character which has not been observed till now in the genus Nenteria OUDEMANS, 1915 .

Figures

Figs 25–32. Nenteria trisetosa sp. n.: 25 = female, holotype, dorsal view, 26 = ventral view, 27 = anterior process of genital shield in holotype, 28 = anterior process of genital shield in one of the paratype, 29 = anterior process of genital shield in an other paratype, 30 = tritosternum, between coxae I, 31 = ventral view of gnathosoma and palps, 32 = chelicerae,lateral view (scale bar:100 µm)