Depressorotunda (Depressorotunda) serrata, Kontschan, Jeno, 2014

Kontschan, Jeno, 2014, Three new rotundabaloghid mites (Acari, Uropodina) from Sabah (Malaysia), ZooKeys 447, pp. 35-45 : 38-42

Taxon classification Animalia Mesostigmata Rotundabaloghiidae

Depressorotunda (Depressorotunda) serrata sp. n. Figs 21-31

Material examined.

Holotype: female. Sab-82/7. Malaysia: Sabah (Sandakan Residency): 15 milles (24 km) W de Sandakan: Sepilok: "Kabili-Sepilok Forest Reserve", forêt près du “Pond” ( étang formant la réserve d’eau pour Sepilok), tamisage de feuilles mortes et de bois pourri, Secondary Lowland Forest; 23.IV.1982; leg. B.Hauser (appareil Winkler-Moczarski à Sepilok). Paratypes: six females and three males, locality and date same as in holotype.

Diagnosis.

Ventral cavity oval, with one pair of long, robust, marginally serrate and curved setae. Genital shield scutiform, its surface smooth. Three pairs of short ventral setae situated near lateral margins of ventral cavity. Setae St4 very long and needle-like.

Description of female.

Length of idiosoma 310-330 μm, width 270-290 μm (n = 7). Shape circular, posterior margin rounded, color reddish brown.

Dorsal idiosoma (Figure 21). Marginal and dorsal shields fused. Dorsal setae long (ca 42-47 μm long) and marginally pilose (Figures 23), apical setae wider than other dorsal setae (Figure 22), dorsal idiosoma without sculptural pattern.

Ventral idiosoma (Figure 24). Sternal and ventral shields without sculptural pattern. All sternal setae smooth, needle-like. Setae St1-St3 short (ca 4-6 μm), St4 robust and long (ca 58-60 μm). St1 situated at level of anterior margin of genital shield, 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, oval, longer (ca 94-97 μm) than wide (ca 83-85 μm) bearing a pair of long (ca 59-62 μm) and serrate setae. Ventral setae smooth, needle-like (cat 32-35 μm) and placed in a row near margins of ventral cavity (Figure 25). Adanal setae absent. One pairs lyriform fissures situated near anterior margin of sternal shield. Stigmata situated between coxae II and III. Peritremes hook-shaped. Genital shield scutiform, surface smooth and its apical margin a little peaked. Pedofossae deep, their surface smooth, separated furrows for tarsi IV present. Base of tritosternum narrow, tritosternal laciniae smooth, subdivided into four smooth branches (Figure 26).

Gnathosoma (Figure 26). Corniculi horn-like, internal malae smooth and very short. Visible hypostomal setae as follows: h1, h2 and h3 long (about 18-21 μm), smooth and needle-like. Apical part of epistome marginally pilose. Ventral side of palp trochanter with one needle-like and one robust and bifurcated setae, other setae on palp smooth and needle-like. Fixed digit of chelicerae longer than movable digit, internal sclerotized node present.

Legs (Figures 27-30). All legs with ambulacral claws and smooth, needle-like setae.

Description of male.

Length of idiosoma 330-340 μm, width 300-330 μm (n = 3).

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

Ventral idiosoma (Figure 31). Four pairs of short sternal setae (St1-St4) needle-like (ca. 4-6 μm), St1 and St2 situated anterior to genital shield, St3 at level of central area of genital shield and St4 at level of posterior margin of genital shield. St5 long, robust (ca. 57-59 μm) and placed near anterior margin of ventral cavity. Dorsal cavity large, oval, longer (ca 96-99 μm) than wide (ca 82-85 μm) bearing a pair of long (ca 58-62 μm) and serrate setae. One pairs lyriform fissures situated near anterior margin of sternal shield, second one pair near posterior margin of anal opening. Surface of ventral shield and shape and size of ventral setae as in female. Genital shield circular and situated between coxae III.

Larva and nymphs unknown.

Etymology.

The name of the new species refers to the serrate setae in ventral cavity.

Remarks.

The long, robust, marginally serrate and curved setae on the big ventral cavity and the extreme long St4 setae in the species Depressorotunda (Depressorotunda) serrata sp. n. are previously not observed characters within the subgenus Depressorotunda (Depressorotunda) Kontschán, 2006.