Rotundabaloghia (Circobaloghia) chilensis, Kontschán, 2022

Kontschán, Jenő, 2022, First record of the family Rotundabaloghiidae Kontschán, 2010 in Chile with the description of Rotundabaloghia (Circobaloghia) chilensis sp. nov. (Acari: Mesostigmata), Acarological Studies 4 (1), pp. 36-40 : 36-38

Rotundabaloghia (Circobaloghia) chilensis sp. nov.

(http://zoobank.org/NomenclaturalActs/8338d123- 5840-445d-9ccc-91e9b83f61c6)

( Figures 1-7 ).

Diagnosis. Surface of dorsal shield smooth, dorsal setae short and smooth. All ventral setae short, smooth and needle-like, setae st1 and st3 shorter st3 and st4. Peritremes question mark-shaped. Longitudinal groove between posterior end of pedofossae IV and posterior margin of ventral shield present.

Material examined. Holotype. female. Chili-84/8. Chile, Osorno Coastal Range , Pucatrihue; II. 1988; leg. L.E. Pena.

Description

Female (n=1).

Description. Length of idiosoma 270, width 240. Shape circular, posterior margin rounded, color yellowish brown.

Dorsal idiosoma ( Fig. 1 ). Marginal and dorsal shields fused. Majority of dorsal setae basally curved, smooth and ca 16–20 long. Three pairs of lyriform fissures situated on posterior-central area of dorsal shield. Surface of dorsal shield without sculptural pattern.

Ventral idiosoma ( Fig. 2 ). Surface of sternal shield smooth. All sternal setae smooth and needle-like, st1 and st2 short (ca 4-5), st3 and st4 long (ca 7-9). Setae st1 situated close to anterior margin of sternal shield, st2 at level of central area of coxae II, st3 at level of central area of coxae III, st4 at level of anterior margin of coxae IV. All ventral setae short (ca 6-8 long), smooth and needle-like. Setae v2 situated near basal edges of genital shield, v7 and v8 situated at level of setae ad. Setae v6 situated close to v2. Setae ad placed lateral to anal opening, at level of its anterior margin. Ventral shield without sculptural pattern. One pair of lyriform fissures situated close to setae v2, other one pair close to v7. Two pairs of pores placed close to setae v2 and on pair close to setae ad. Peritremes short, poststigmatid part absent, prestigmatid part question mark-shaped. Stigmata situated between coxae II and III. Genital shield wide, linguliform (100 long and 56 wide at level of st4), without apical process and without sculptural pattern, only some longitudinal shallow grows visible on posterior part. Pedofossae deep, their surface smooth, separate furrows for tarsi IV present. Longitudinal groove between posterior end of pedofossae IV and posterior margin of ventral shield present.

Base of tritosternum narrow, vase-like, tritosternal laciniae smooth, subdivided into three smooth branches in its distal half ( Fig. 3 ).

Gnathosoma ( Fig. 3 ). Corniculi horn-like, internal malae smooth and as long as corniculi. All hypostomal setae smooth and needle-like, h1 long (ca 11-12), h2, h3 and h4 shorter (ca 5-6). Epistome apically serrate. Palp with smooth and needle-like setae. Chelicerae not visible.

Legs ( Figs 4-7 ). All legs with smooth and needle-like setae, the claws on first leg present, but smaller than others. All femora bearing flap-like ventral processes. Leg I 140-142, leg II 108-109, leg III 100-101, leg IV 145-147.

Male and immature stages. Unknown.

Etymology. The name of the new species refers to the country where the new species was collected.

Remark. The new species has a unique character combination (short and smooth dorsal setae, short and smooth setae on ventral idiosoma, smooth surface of dorsal and ventral parts of idiosoma and the shape of peritremes, the longitudinal groove between posterior end of pedofossae IV and posterior margin of ventral shield present) which is not observable on other known rotundabaloghiid mites.

Figures

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

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

Figures 3-7. Rotundabaloghia (Circobaloghia) chilensis sp. nov. female, holotype. 3. Ventral view of gnathosoma, palp, tritosternum, epistome (e) and coxae I, 4. Leg I. in ventral view, 5. Leg II in ventral view, 6. Leg III in ventral view, 7. Leg IV in ventral view.