Longicarinaturella baloghi, 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 : 328-330

Longicarinaturella baloghi sp. n. ( Figs 33–38 )

Diagnosis. Central region of dorsal shield elevated from the other parts of dorsum and bearing smooth and needle-like setae and characteristic web-like ornamentation. Marginal setae smooth and needle-like. Sculptural pattern of dorsal and marginal shields characteristic web-like. Surface of genital shield smooth in female. Ventral setae smooth and needle-like. Ventral shield with alveolar pits. Peritremes hook-form.

Material examined. Holotype: Female. Brazil, Pantanal, Chapada Dos Guimaraes, forest, from leaf litter, 09.12.1992 leg. J. BALOGH. Paratype: one female and four males (one of the males on slide, the others in alcohol) . Locality and date same as holotype.

Description. Female. Length of idiosoma 360–390 µm, width 300–310 µm (n = 2). Shape pear-like, posterior margin rounded.

Dorsal idiosoma ( Fig. 33 ). Marginal and dorsal shields fused anteriorly at level of coxae II. Central region of dorsal shield elevated from the other parts of dorsum and bearing smooth and needle-like setae (c. 10–12) and characteristic web-like ornamentation. Marginal setae smooth and needle-like (c. 7–8). Marginal and dorsal shields with characteristic web-like sculptural pattern.

Ventral idiosoma ( Fig. 34 ). Surface of sternal shield smooth. Sternal setae short (c. 4–6), smooth and needle-like. St1 placed near to the anterior margin of genital shield, St2 on the level of central region of coxae II, St3 on the level of antarion margin of coxae III, St4 on the level of anterior margin while St5 on the level of posterior margin of coxae IV. Ventral setae smooth and needle-like. V1and adanal setae three times shorter than other ventral setae. Ventral shield covered by alveolar pits. Stigmata situated between coxae II and III. Peritremes hook-form. Genital shield linguliform, without ornamentation and anterior process. Base of tritosternum vase-like, tritosternal laciniae subdivided into five smooth branches ( Fig. 35 ).

Gnathosoma ( Fig. 36 ). Corniculi horn-like, internal malae shorter than corniculi and smooth. Hypostomal setae are the follows: h1 smooth and situated near the anterior margins of gnathosoma, h2 smilar in shape and length to h1, h3 and h4 smooth, needle-like and half as long as h1 and h2. Base of epistome with serrate margins, apically part not clearly visible. Chelicera as in Fig. 37 .

Male. Length of idiosoma 370–380 µm, width 280–290 µm (n = 4). Shape peak-like, posterior margin rounded.

Dorsal idiosoma. Ornamentation and chaetotaxy of dorsal shield as in female.

Ventral idiosoma ( Fig. 38 ). Sternal shield with alveolar pits. Sternal setae short and needle-like, their situation and shape illustrated on Fig. 38 . Genital shield rounded, placed between coxae IV.

Gnathosoma. Similar to that of the female.

Nymphs and larvae. Unknown.

Etymology. The new spcies is dedicated in honor to Prof. Dr. JÁNOS BALOGH, the famous

Hungarian acarologist, who collected the soil samples in Brazil. gion of male paratype (scale bar: 100 µm)

Notes on the genus Longicarinaturella . HIRSCHMANN (1979) established the genus Longicarinaturella (type species: Longicarinaturella longicarinata ( HIRSCHMANN, 1972) by original designation) to separate members of the longicarinata species group from the genus Discourella BERLESE, 1910 . The newly described genus differs by several characters from the genus Discourella (Table 2), regarding the basis of the shape of the idiosoma, marginal shield on caudal region, peritreme, and internal malae. Nevertheless, later HIRSCHMANN (1993) and his co-workers (WIŚNIEWSKI 1993, WIŚNIEWSKI & HIRSCHMANN 1993) placed all Longicarinaturella species back into the genus Discourella , re-establishing the longicarinata species group, which contains recently three species from Japan and another three from Brazil. The Brazilian and the Japanese species differ from each other sufficiently to regard the Brazilian species as the genus Longicarinaturella and the Japanese species are members of an undescribed genus. However, the Japanese species require a thorough revision, which is beyond the scope of this work. Hence, in the meantime I place the Japanese species into the genus Discourella until this revision is made. I consider Longicarinaturella a well-defined genus and easy to separate from the other similar genera. Therefore, I regard Longicarinaturella a valid genus that comprises four species that are likely endemic in the Neotropical region and belongs in the family Discourellidae .

Figures

Figs 33–38. Longicarinaturella baloghi sp. n.: 33 = female, holotype, dorsal view, 34 = ventral view, 35 = tritosternum, 36 = ventral view of gnathosoma,37 = chelicera, lateral view, 38 = sternigenital re-