Rotundabaloghia (Rotundabaloghia) dogani, Kontschán, 2021

Kontschán, Jenő, 2021, Rotundabaloghia (Rotundabaloghia) dogani sp. nov. from Hong Kong (Acari: Mesostigmata: Rotundabaloghiidae), Acarological Studies 3 (1), pp. 32-36 : 32-33

Rotundabaloghia (Rotundabaloghia) dogani sp. nov.

Zoobank: http://zoobank.org/ 3083E06F-F613-4729- B2B9-9479030B463C

( Figures 1-7 ).

Diagnosis. Dorsal shield covered by oval pits, dorsal setae long and apically pilose except three pairs of short and needle-like setae on central area. All ventral setae smooth and needle-like, setae st1 short, setae v2 and v6 shorter than v7 and v8.

Material examined. Holotype. Female. SBH-96/17, Hong Kong (New Territories), Tai Po Kau Nature Reserve , after the big picnic area soil sampled near a dead but still standing tree, 150 m a.s.l.; 9.XII.1996; leg. B. Hauser (soil extraction by means of a Berlese funnel in Geneva). Paratypes. Two females and one male, collection data as in holotype.

Description

Female (n=3).

Description. Length of idiosoma 325–335, width 265–280. Shape circular, posterior margin rounded, colour reddish brown.

Dorsal idiosoma ( Fig. 1 ). Marginal and dorsal shields fused. Majority of dorsal setae basally curved and apically pilose (ca 36–39), except three pairs of short (ca 9–10) and smooth setae on rows j–J. Four pairs of lyriform fissures and two pairs of pore-like organs situated on central and centrolateral areas of dorsal shield. Surface of dorsal shield covered by oval pits (ca 4–5×4–6).

Ventral idiosoma ( Fig. 2 ). Sternal shield covered by some oval pits (ca 4–5×4–5). All sternal setae smooth and needle-like, st1 and st4 short (ca 4–5), st2 and st3 long (ca 7– 11). Setae st1 situated at level of anterior margin of coxae II, st2 at level of posterior margin of coxae II, st3 at level of central area of coxae III, St4 at level of anterior margin of coxae IV. All ventral setae smooth and needle-like, v2 and v6 ca 8–10, v7 ca 17–18, v8 ca 23–25 and adanal setae ca 16–17 long. Setae v2 situated near basal edges of genital shield, v7 and v8 situated at level of setae ad. Setae v6 situated between v2 and v8. Setae ad placed lateral to anal opening, at level of its anterior margin. Ventral shield covered by oval pits (ca 5–6×5–6), but smooth around anal opening. One pair of lyriform fissures situated close to setae v2. Peritremes ( Fig. 2 ) with a short straight poststigmatid part and a longer hook-shaped prestigmatid part. Stigmata situated between coxae II and III. Genital shield wide, linguliform (108–110 long and 55–58 wide at base), without apical process. Surface of genital shield covered by oval pits (ca 4–6×5–6). Pedofossae deep, their surface smooth, separate furrows for tarsi IV present. Base of tritosternum narrow, vase-like, tritosternal laciniae smooth, subdivided into three smooth branches in its distal half.

Gnathosoma . Corniculi horn-like, internal malae smooth and as long as corniculi. Hypostomal setae h1 long (ca 9– 13), smooth and needle-like. Other setae and other parts not visible, covered by coxae I.

Legs ( Figs 3–6 ). All legs with smooth and needle-like setae, the claws on first leg absent. All femora bearing flaplike ventral processes. Leg I 190–195, leg II 195–205, leg III 195–205, leg IV 200–210.

Male (n=1).

Length of idiosoma 325, width 275.

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

Ventral idiosoma ( Fig. 7 ). Four pairs of sternal setae (st1– st4) situated anterior to genital shield, st5 placed lateral to genital opening. Setae st1, st4 and st5 short (ca 4–7), st2 and st3 long (ca 12–13) all sternal setae smooth and needle-like. All ventral setae smooth and needle-like, v2 and v6 ca 13–15, v7 and v8 ca 22–26 and adanal setae ca 17– 18 long. Positions of ventral setae same as in females. Ventral shield covered by oval pits (ca 4–5×4–6), but smooth around anal opening. One pair of lyriform fissures situated close to setae v2. Other characters as in female. Genital shield oval (27×28) and situated between coxae IV.

Larva and nymphs. Unknown.

Etymology. I dedicated the new species to my dear friend and the founder of the Acarological Studies, Dr. Salih Doğan.

Remark. Currently only three rotundabaloghiid species were described from Hong Kong (Kontschán, 2015), namely Angolubaloghia staryi Kontschán, 2015, Rotundabaloghia (Rotundabaloghia) hongkongensis Kontschán, 2015 and Depressorotunda (Depressorotunda) taurina Kontschán 2015 . The new species differs in some characters from the previously described ones. The R. (R.) dogani does not have ventral cavity, contrary with the D. (D.) taurina , where it is well-developed. The genital shield of the new species is linguliform, but it is triangular in the case of A. staryi. The setae v8 is very short and v2 very long in R. (R.) hongkongensis , but the new species bears short v2 and long v8 setae.

Updated key for the Rotundabaloghia (Rotundabaloghia) species (modified, after Kontschán, 2015).

1, Setae v8 smooth............................................................................... 2 – Setae v8 not smooth ....................................................................... 8 2, Setae v8 shorter than other ventral setae ........................... 6 – Setae v8 similar in length to v7 .................................................. 3 3, Setae v2 and v6 shorter than v7 and v8 .................................... ........................................................................... R. (R.) dogani sp. nov. – Setae v2 and v6 similar in length to v7 and v8 ..................... 4 4, Setae v7 longer than other ventral seta ................................... .................................................... R. (R.) kaszabi Hirschmann, 1975 – Setae v7 as long as other ventral setae .................................. 5 5, Scupltural patter between setae v7 present .......................... ........... R. (R.) makilingoides Hirschmann & Hiramatsu, 1992 – Scupltural patter between setae v7 absent ............................ ........... R. (R.). makilingensis Hirschmann & Hiramatsu, 1992 6, Setae v6 as long as v8 ....................................................................... ......................................... R. (R.) hongkongensis Kontschán, 2015 – Setae v6 longer than v8 .................................................................. 7 7, Setae v8 as long as ad ....... R. (R.) korsosi Kontschán, 2008 – Setae v8 shorter than ad ................................................................. .............................................. R. (R.) hirschmanni Hiramatsu, 1977 8, Setae ad pilose ............... R. (R.) baloghi Hirschmann, 1975 – Setae ad smooth ............................................................................... 9 9, Setae v7 pilose ...............................................................................10 – Setae v7 smooth ..............................................................................11 10, Setae st1, st2 and st3 much longer (10×) than st4 ............ .............................................. R. (R.) macroseta Hirschmann, 1975 –Setae st1, st2 and st3 not much longer (4×) than st4 ............ ............................................... R. (R.) mahunkai Hirschmann, 1975 11, Seate st1 longer and wider than st2 and st3 ........................ ................................... R. (R.) monomacroseta Hirschmann, 1975 – Setae st1 not longer and wider than st2 and st3 ...............12 12, Setae v7 two times longer than ad .......................................... ....................................... R. (R.) kaszabisimilis Hirschmann, 1975 – Setae v7 as long as ad ....... R. (R.) pilosa Hirschmann, 1975

Figures

Figure 1. Dorsal view of Rotundabaloghia (Rotundabaloghia) dogani sp. nov. female, holotype.

Figure 2. Ventral view of Rotundabaloghia (Rotundabaloghia) dogani sp. nov. female, holotype.

Figures 3-7. Rotundabaloghia (Rotundabaloghia) dogani sp. nov. female, holotype. 3. Leg I. in ventral view, 4. Leg II in ventral view, 5. Leg III in ventral view, 6. Leg IV in ventral view, 7. Intercoxal area of male paratype.