Zerconella (Metazercon) lobata, Ujvári, Zsolt, 2010

Ujvári, Zsolt, 2010, Zerconella Willmann, 1953, a forgotten group of Zerconidae (Acari: Mesostigmata), Zootaxa 2558, pp. 33-47 : 39-45

publication ID	https://doi.org/ 10.5281/zenodo.196960
DOI	https://doi.org/10.5281/zenodo.6195958
persistent identifier	https://treatment.plazi.org/id/270B87F2-C627-1358-FF0D-FABDFACDFDC5
treatment provided by	Plazi
scientific name	Zerconella (Metazercon) lobata
status	sp. nov.

Treatment

Zerconella (Metazercon) lobata sp. n.

( Figs 11–20 View FIGURES 11 – 14 View FIGURES 15 – 16 View FIGURES 17 – 18 View FIGURES 19 – 20 , 25 View FIGURES 21 – 25 )

Type material. Holotype female (AS-876), Taiwan, Nantou county, Kunyang, logging road, primary broadleaved forest, from leaf-litter, 24o06.705'N, 121o11.977'E, 2200 m a.s.l., 22 May 2008., leg. L. Dányi, Z. Korsós & E. Lazányi.(in the Collection of Soil Zoology of the Hungarian Natural History Museum, Budapest). Paratypes: 2 females (AS-905), Taiwan, Miaoli County, Taian, township, Shei-Pa National Park, Kuanwu, Yulun Trail, 24°30.002'N, 121°6.434'E, 2200 m a.s.l., primary broad-leaved forest, leaf-litter, 20 October 2009, leg. L. Dányi & E. Lazányi; 1 female (AS-917), Taiwan, Nantou County, Ren-ai, township, Taroko N.P., Dayuling, Western slope of Mt. Maomu, Mt. Bilu Trail, 24°11.095'N, 121°18.615' E, 2580 m a.s.l., primary broad-leaved forest with stream, moss from trunks, 11 October 2009, leg. L. Dányi & E. Lazányi; 35 females, 2 males, 1 deutonymph (AS-932), Taiwan, Hualien County, Xiulin, township, Taroko N.P., Dayuling, Eastern slope of Mt. Maomu, 24°10.881'N, 121°19.408'E, 2498 m a.s.l., disturbed secondary mixed forest, leaf-litter, 11 October 2009, leg. L. Dányi & E. Lazányi.

Diagnosis. Dorsal setae rarely, very finely pilose or smooth. Setae z3, r3, s5 and S3–5 very long, extending beyond margin of idiosoma by more than half of their length. Opisthonotal setae relatively long, thickened, apically tapering. Setae J5 situated medially to J4. Margin of opisthonotum with seven pairs of setae. Central surface of opisthonotum covered by alveolar pits. Single pair of well-sclerotised dorsal cavities present, covered by large, posterocentral lobes which have strongly sclerotised, continuous posterior margin running arcuately between setae S5.

Description. Female. Length of idiosoma: 265–280 μm; width 175–195 μm (n= 39).

Dorsum ( Figs 11 View FIGURES 11 – 14 , 15 View FIGURES 15 – 16 ). Podonotum with 20 pairs of finely pilose setae ( Fig. 16 View FIGURES 15 – 16 ). Setae z3 and s5 very long (48–65 μm), apically tapering, reaching beyond margin of idiosoma by more than half of their length. Other podonotal setae similar in shape, setiform (16–36 μm). Setae j6 reaching beyond bases of J2, z6 reaching beyond insertions of Z1. Gland openings gdj2 (po1) situated below line connecting insertions of j3 and s1, remaining podonotal gland pores not conspicuous. Sculpturing pattern of podonotum squamous, posteromedial surface with small, alveolar pits. Opisthonotum with 20 pairs of elongate, apically tapering, finely pilose setae. Setae J1 absent. Setae J3 reaching beyond insertions of J4 and J5, 1.5–2 times as long as J2. Setae J5 situated medially to J4, shorter than J3–4. Setae Z1 shorter than any other opisthonotal setae. Setae Z2–5 similar in shape and length to central J-setae. S2 similar in shape and length to J2. Setae S3–5 ( Fig. 20 View FIGURES 19 – 20 ) very long, reaching beyond margin of idiosoma, apically tapering. Marginal setae uniform, similar to that of podonotal margin. Size of opisthonotal setae and distance between their bases according to Table 1. Only exterior pair of dorsal cavities present, which large, strongly sclerotised, with smooth margins and axes converging posteriorly. Two large, lobe-like structures ( Figs 17–18 View FIGURES 17 – 18 ) emerging on posterior part of opisthonotum towards the caudal margin of idiosoma, covering dorsal cavities and bases of setae JV5. These lobe-like structures have a continuous, strongly sclerotised posterior margin expanding between setae S5. Small mound can be observed posteromedially to dorsal cavities. Gland openings gdJ4 (Po3) situated on a line connecting Z4 and Z5, near caudolateral margin of characteristic lobes, others not conspicuous. Marginal serration of dorsal idiosoma obtuse. Central and lateral surface of opisthonotum covered by alveolar pits.

Ve n te r ( Fig. 12 View FIGURES 11 – 14 ). Peritrematal shields truncated at level of fourth pair of coxae, between level of S1-R1, separated by triangular slit from podonotal shield, and ornamented by longitudinal fissures. Peritremes extremely short. Both peritrematal setae very finely pilose, r3 six times as long as r1. Sternal shield 46–50 μm long, 37–40 μm wide at level of setae st2, posterior margin slightly concave. Adgenital platelets small, bearing 2 gland-openings of gv2. One pair of post-genital sclerites often present. Ventri-anal shield with 7 pairs of preanal setae, posteriorly fused to opisthonotal shield. All ventral setae smooth or finely pilose. Ventri-anal pores situated near adanal setae, in posterolateral direction. Anal valves with vestigial euanal setae. Sternal shield with reticulate ornamentation, ventri-anal shield covered by tile-like pattern.

Male ( Figs 13–14 View FIGURES 11 – 14 ). Length of idiosoma: 210–215 μm; width 151–154 μm (n=2).

Dorsal chaetotaxy, adenotaxy, poroidotaxy and sculpturing pattern similar to that of female. Length of opisthonotal setae and distance between their bases according to Table 1. Sternogenital shield with five pairs of setae (st1–5). Genital opening situated behind level of setae st3. Posterior ends of peritrematal shields free, truncated at level of S1.

Ƥ 3 DN Ƥ 3 DN Ƥ 3 DN

Z 1 16 22 28 S 1 30 22 23

Z1-Z 2 33 21 30 S1- S 2 24 17 20 J 2 32 22 25 Z 2 45 29 36 S 2 33 22 31 J2-J 3 30 20 25 Z2-Z 3 30 17 18 S2- S 3 20 17 20 J3 53 40 45 Z3 55 49 67 S3 63 39 30 J3-J 4 25 15 18 Z3-Z 4 15 15 16 S3- S 4 33 24 28 J 4 45 28 39 Z4 47 38 48 S4 69 52 72 J4-J 5 23 17 17 Z4-Z5 48 41 38 S4- S 5 33 23 25 J 5 38 24 41 Z5 50 41 46 S5 69 60 77 Deutonymph ( Fig. 19 View FIGURES 19 – 20 ). Length of idiosoma: 247 μm, width 164 μm (n=1).

Dorsal chaetotaxy, adenotaxy and poroidotaxy similar to that of adults, sculpturing pattern on podonotum and lateral surface of opisthonotum weakly developed. Shape of posterodorsal lobes as in Fig. 19 View FIGURES 19 – 20 . Length of opisthonotal setae and distance between their bases according to Table 1.

Etymology. The name of the new species refers to the characteristic caudodorsal lobes.

Remarks. The new species is closely related to Zerconella (Metazercon) athiasae (Błaszak, 1975) and Zerconella (Metazercon) rafalskii ( Błaszak et al., 1997) by having only two dorsal cavities. Females of the three species can be distinguished by the following features. In Zerconella (Metazercon) lobata , setae J5 are situated medially to J4, setae J1 are absent, the sculpturing pattern on the lateral parts of the opisthonotum is weakly developed, the surface between the J-series setae is covered by large, alveolar depressions, and a well sclerotised arcuate margin runs between setae S5, laterally forming two caudodorsal lobes; in Zerconella (Metazercon) athiasae , setae J5 are situated posterolaterally to J4, setae J1 are present, the anterior and lateral surface of the opisthonotum is covered by a tile-like pattern, the anteromedian surface between the J-series setae has reticulate ornamentation, spot-like depression can only be found between setae J4 and J5, on the caudodorsal part three separate, well sclerotised mounds can be observed; in Zerconella (Metazercon) rafalskii setae J5 are situated posteromedially to J4, setae J1 are present, the sculpturing pattern on lateral parts of opisthonotum is weakly developed, the surface between the J-series setae is covered by small, spotlike depressions, and on the caudodorsal part three separate, well sclerotised mounds can be observed.