Depressorotunda (Depressorotunda) taurina, Kontschán, 2015

Kontschán, Jenő, 2015, Three new rotundabaloghid mites (Acari: Uropodina) from Hong Kong, Revue suisse de Zoologie 122 (1), pp. 45-54 : 50-51

Depressorotunda (Depressorotunda) taurina sp. nov.

Figs 21-29

Holotype: MHNG, sample SBH-96/19 ; female; Hong Kong (New Territories), Tai Mo Shan Country Park , barrier ravine, petits îlots de forêt, prélèvement de sol entre les racines de Machilus sp. (Lauraceae) , 750 m; 9.XII.1996; leg. B. Hauser (extraction par appareil Berlese à Genève).

Key to the species of Rotundabaloghia (Rotundabaloghia) species (modified, after Kontschán, 2010b):

1 V8 setae smooth........................................................................................................................................................ 2

– V8 setae not smooth ................................................................................................................................................. 7

2 V8 shorter than other ventral setae ........................................................................................................................... 5

– V8 as long as V2, V6 and ad .................................................................................................................................... 3

3 V7 longer than other ventral seta. ...................................................................... R. (R.) kaszabi Hirschmann, 1975b

– V7 as long as other ventral setae .............................................................................................................................. 4

4 ornamentation between V7 present ...................................... R. (R.) makilingoides Hirschmann & Hiramatsu, 1992

– ornamentation between V7 absent....................................... R. (R.). makilingensis Hirschmann & Hiramatsu, 1992

5 V6 as long as V8........................................................................................................ R. (R.) hongkongensis sp. nov.

– V6 longer than V8 .................................................................................................................................................... 6

6 V8 as long as ad ..................................................................................................... R. (R.) korsosi Kontschán, 2008b

– V8 shorter than ad ........................................................................................... R. (R.) hirschmanni Hiramatsu, 1977

7 setae ad pilose..................................................................................................... R. (R.) baloghi Hirschmann, 1975b

– setae ad smooth......................................................................................................................................................... 8

8 V7 pilose .................................................................................................................................................................. 9

– V7 smooth...............................................................................................................................................................10

9 St1, St2 and St3 much longer (10×) than St4 ................................................ R. (R.) macroseta Hirschmann, 1975b

– St1, St2 and St3 not much longer (4×) than St4 ............................................. R. (R.) mahunkai Hirschmann, 1975b

10 St1 longer and wider than St2 and St3 ................................................. R. (R.) monomacroseta Hirschmann, 1975b

– St1 not longer and wider than St2 and St3 ............................................................................................................. 11

11 V7 two times longer than ad .................................................................... R. (R.) kaszabisimilis Hirschmann, 1975b

– V7 as long as ad .................................................................................................... R. (R.) pilosa Hirschmann, 1975b

Paratype: MHNG; 1 female; same data as for holotype .

Diagnosis: Ventral cavity quadrangular, with one pair of long, robust and curved setae. Genital shield linguliform, its surface with shallow pits. Three pairs of short ventral setae situated near lateral margins of ventral cavity. The long, robust and curved setae in the big ventral cavity in Depressorotunda (Depressorotunda) taurina sp. nov. is a previously not observed character within the subgenus Depressorotunda (Depressorotunda) Kontschán, 2010a .

Description of female: Length of idiosoma 290-310 μm, width 260-270 μm (n=2). Shape circular, posterior margin rounded, color reddish brown.

Dorsal idiosoma ( Fig. 21 ): Marginal and dorsal shields fused. Dorsal setae long (about 27-33 μm long) and smooth ( Figs 22-23 ), dorsal idiosoma with small oval pits ( Figs 22-23 ).

Ventral idiosoma ( Fig. 24 ): Sternal and ventral shields without sculptural pattern. All sternal setae smooth, needle-like and short (about 7-9 μm), St1 situated at level of anterior margin of coxae II, St2 at level of posterior margin of coxae II, St3 at level of posterior margin of coxae III, St4 near basal edges of genital shield. Dorsal cavity large, quadrangular, wider (about 75-76 μm) than long (about 34-35 μm). Ventral setae smooth and needlelike. V1 placed in ventral cavity, long (about 34-35 μm), robust and curved. V2, V3 and V4 short (about 9-10 μm) and needle-like. V2 situated near anterior edges of ventral cavity, V3 and V4 near basal edges of ventral cavity ( Fig. 25 ). Adanal setae absent. One pair of lyrifissures situated near St4. Stigmata situated between coxae II and III. Peritremes hook-shaped. Genital shield long and linguliform, surface with shallow pits, its apical margin rounded. Tritosternum covered by coxae I ( Fig. 26 ), its parts not visible. Pedofossae deep, their surface smooth, separated furrows for tarsi IV present.

Gnathosoma ( Fig. 26 ): Corniculi horn-like, internal malae shorter than corniculi and smooth. Hypostomal setae as follows: h1 long (about 27 μm), smooth and needle-like, h2, h3 and h4 short (about 12-15 μm), smooth and needle-like. Apical part of epistome weakly pilose. Chelicerae not clearly visible.

Legs ( Figs 26-29 ). All legs with ambulacral claws and smooth, needle-like setae.

Male, larva and nymphs unknown.

Etymology: The new species is named after the long, robust and curved V1 setae, which are similar to bull horns; “taurina” is the Latinized adjective of “taurus” (= bull).

Figures

Figs 21-25. Depressorotunda (Depressorotunda) taurina sp. nov., female holotype. (21) Body in dorsal view. (22) Setae and ornamentation in central area of dorsal shield. (23) Setae and ornamentation in lateral part of dorsal shield. (24) Body in ventral view. (25) Intercoxal area and ventral cavity in ventral view.

Figs 26-29. Depressorotunda (Depressorotunda) taurina sp. nov., female holotype. (26) Ventral view of leg I and gnathosoma. (27) Ventral view of leg II. (28) Ventral view of leg III. (29) Ventral view of leg IV.