Neumania (Soarella) curosa, DingK & YiK & K & JinK, 2024

DingK, Zhu-Hui, YiK, Tian-Ci, K, Jian-Jun Guo & JinK, Dao-Chao, 2024, New records of the subgenus Soarella Koenike, 1907 from China (Acari, Hydrachnidia, Unionicolidae, Neumania), with the description of five new species, Acarologia 64 (1), pp. 256-276 : 267-269

Neumania (Soarella) curosa sp. nov.

Zoobank: 4C9A5E65-3DE1-4B79-8F1E-6A2E524EDC27

( Figures 9–10 )

Diagnosis — Idiosoma with weak sclerotization, densely with fine setae, dorsum with

two pairs of small dorsalia. All glandularia exhibit varying degrees of protrusion. Excretory pore positioned at subtermnal dorsum, and accompanied by developed spindle-like nodule, and aligned with L 4. P-3 with two blunt barbed setae. Suture line between Cx-III/IV complete, female genital field with 21–28 pairs of acetabula. The postgenital sclerite in conjunction with the posterior edge of the genital plate.

Etymology — The specific name is from Latin word: “curo” means coalesce, the name of this new species is derived from the fusion of the postgenital sclerite and the genital plate.

Material examined — Holotype: ♀ ; Xinmin New Village , Wuzhishan City, Hainan Province, China ; 18°52′17.47″N, 109°39′15.89″E, 908 m a.s.l. ; 17 Jan. 2018 ; Zhuhui Ding leg.; GUGC.

Description — Female: Idiosoma with weak sclerotization, covered with fine setae, dorsum with two pairs of dorsalia, excretory pore subterminal located, on a well-developed spindle-like tubercle ( Figure 9a ). Coxal plates in four groups, surface lightly reticulated, interspace between Cx-II and Cx-III wide, suture line between Cx-III/IV complete, posterior apodemes of ACG extending to one-third of Cx-IV, posterior projection of Cx-IV straight. The mid-edge spacing of Cx-IV wide ( Figure 9B ). Genital plates subterminally located, with clearly defined secondary sclerotized margins, each with 21–28 acetabula, and the posterior edge of the genital palates fused with the postgenital sclerite, and the plate contains 7–8 genital setae ( Figure 9D ).

Palp five-segmented. P-1 distally with one dorsal seta; P-2 with one dorsomedial seta and two distolateral barbed setae; P-3 with two blunt barbed setae, the mediolateral one much longer than the dorsodistal one; P-4 with two closed ventral setae situated on little tubercles, along with one peg-like seta inserted at its small base, with a distolateral long fine seta; the claws of P-5 indistinctly trifurcated ( Figure 9C ). I-L-4, 5 ventrodistally with one short, one long swimming seta, respectively ( Figure 10A ); II-L-4, 5 ventrodistally with one, two swimming setae, respectively ( Figure 10B ); III-L-3, -4, -5 distally with one, four, three swimming

setae, respectively ( Figure 10C ); IV-L-3, -4, -5 distally with two, five, three swimming setae, respectively; IV-L-6 ventrally with two serrate setae ( Figure 10D ).

Measurements — Female (n = 1): Idiosoma L 688, W 586 (L/W ratio 1.17); genital plates

126, W 64 (L/W ratio 1.97); gonopore L 150. LA 353; LP 241; medial distance between Cx-IV 50. Gnathosoma L 96. Lengths of P-1–5: 26, 88, 38, 61, 32. Lengths of I-L-1–6: 54, 106, 107,

164, 172, 190. Lengths of II-L-1–6: 66, 114, 104, 164, 179, 194. Lengths of III-L-1–6: 67,

101, 95, 157, 186, 174. Lengths of IV-L-1–6: 100, 112, 122, 194, 221, 201.

Male: Unknown.

Remarks — This species shares similarities with Neumania (Soarella) angulata, Sokolow ,

1931 in terms of: (1) the length of the posterior apodemes of ACG, (2) the general shape of the palps. However, the new species differs from N. angulata in: (1) The excretory pore of N. angulata is positioned at the ventral end, whereas the excretory pore opening of the new species is located near the dorsal end. (2) In N. angulata , P-2 bears four setae, whereas the new species has only three. (3) The female IV-L-3–5 of N. angulata possesses 2, 6, 4 swimming setae, respectively, whereas the new species has 2, 5, 3 swimming setae in the same leg segments. (4) The anterior dorsalia in N. angulata is situated medially to D 1, while in the new species, it is positioned below D 1.

Distribution — China (Hainan Province), pond.

1–6; D. IV-L-1–6; Scale bars = 100 μm.

Figures

Figure 9 Neumania (Soarella) curosa sp. nov. (Female A–D): A. Idiosoma, dorsal view; B. Idiosoma, ventral view; C. Palp; D. Genital Field; Scale bars = 100 μm.

Figure 10 Neumania (Soarella) curosa sp. nov. (Female A–D): A. I-L-1–6; B. II-L-1–6; C. III-L-