Uroobovella oviformis, Kontschán, Jenő & Starý, Josef, 2011

Kontschán, Jenő & Starý, Josef, 2011, Uropodina species from Vietnam (Acari: Mesostigmata), Zootaxa 2807, pp. 1-28: 9

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http://doi.org/ 10.5281/zenodo.202067

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scientific name

Uroobovella oviformis

sp. nov.

Uroobovella oviformis   sp. nov.

( Figs 21–25 View FIGURES 21 – 25 )

Material examined. Holotype. Female ( HNHM), Vietnam, Tam Dao, submontane foggy forest, litter sample, 1200 m, 16 October 1988, J. Starý coll. Paratypes. One female and one male ( ISB), locality and date same as holotype.

Description. Female. Length of idiosoma 590–600 µm, width 410–430 µm (n= 2). Shape oval.

Dorsal idiosoma ( Fig. 21 View FIGURES 21 – 25 ). Marginal and dorsal shields fused anteriorly. Dorsal shield with long, smooth needle-like setae, ca 23–29 µm, surface of dorsal shield smooth. Marginal setae smooth, similar in shape and length to dorsal setae, marginal shield without sculptural pattern.

Ventral idiosoma ( Fig. 22 View FIGURES 21 – 25 ). Ornamentation on sternal shield absent. Eight pairs of sternal setae short (ca 7–8), smooth and needle-like. St 1 situated near anterior margin of sternal shield, St 2 near anterior margin of genital shield, St 3 at level of central region of coxae II, St 4 and St 5 at level of posterior margin of coxae II, St 6 at level of central region of coxae III, St 7 at level of posterior margin of coxae III, St 8 near posterior corners of genital shield. Ventral shield with seven pairs of smooth needle-like setae (ca 25–30 µm long). Two pairs of adanal setae and postanal seta similar in shape and length to ventral setae. Endopodal line present. Stigmata between coxae II and III. Peritremes hook-shaped. Genital shield linguliform, without sculptural pattern or anterior process. Tritostenum not clearly visible.

Gnathosoma ( Fig. 23 View FIGURES 21 – 25 ). Corniculi horn-like, with smooth surface, internal malae longer than corniculi, their margins smooth. Hypostomal setae h 1 smooth, ca 45 µm, situated near anterior margin of gnathosoma, h 2 basally serrate, ca 30 µm, h 3 smooth, ca 50 µm, h 4 marginally serrate, ca 15 µm long. Epistome marginally serrate. Chelicerae with internal sclerotised node, movable digit shorter than fixed digit ( Fig. 24 View FIGURES 21 – 25 ).

Legs with smooth and simple setae, leg I with ambulacral claws.

Male. Length of idiosoma 610 µm, width 420 µm (n = 1). Shape of idiosoma, ornamentation, and chaetotaxy of dorsum as in female. Eight sternal setae smooth, short (7–8 µm) and needle-like ( Fig. 25 View FIGURES 21 – 25 ). Surface of sternal shield smooth, genital shield oval, situated between coxae II and III ( Fig. 25 View FIGURES 21 – 25 ). Ventral setae and ornamentation similar to those of female, except one pair of additional ventral setae (Vx) present.

Etymology. The name of the new species refers to the egg-like shape of its idiosoma.

Remarks. The new species belongs to the Uroobovella ruehmi   group on the basis of the following common characters ( Hirschmann, 1989): leg I with claws, peritremes hook-shaped, and idiosoma egg-shaped with wide marginal shields, presence of eight pairs of sternal setae, and the absence of fossula tarsales and pedales. Only six species other have been described from this species group. Hirschmann (1989) established a key to this group, and on the basis of this key the new species is closely related to Uroobovella parva Hiramatsu & Hirschmann   , but these two species differ in the shape of female genital shield, which is oval in U. parva   and linguliform in U. oviformis   . The males differ in that the additional setae (Vx) is shorter than the other ventral setae in U. oviformis   , but there are no differences in the length of ventral setae in U. parva   .


Hungarian Natural History Museum (Termeszettudomanyi Muzeum)


Institute of Spelology Emile Racovita