Neumania (Soarella) acanthophora, 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 : 269-274

Neumania (Soarella) acanthophora sp. nov.

Zoobank: 1265A7F0-BBDD-4A98-8A22-AE475959D3CE

( Figures 11–15 )

Diagnosis — Idiosoma with weak sclerotization, dorsum with one pair of irregularly shaped dorsalia. All glandularia on well-developed tubercles. Excretory pore on a well-developed spindle-shaped tubercle. P-3 with two long setae, P-4 with two developed tubercles, each bearing one seta, and one ventrodistal peg-like seta on protuberant base. Suture line between Cx-III/IV incomplete, male genital field with 47–50 pairs of acetabula, female with 39–49 pairs.

Etymology — The specific name is from Latin word: “ acanth- » means thorns, “-phora » means attachment, The name of this new species is derived from its spinous tubercle on its dorsum.

Material examined — Holotype: ♂ ; Songhua River , Harbin city, Heilongjiang Province, China ; 24°35′38.10″N, 97°43′24.29″E, 1300 m a.s.l. ; 21 Jul. 2002 ; Jianjun Guo leg.; GUGC . Paratypes: 1 ♀ ; the same data as the holotype ; GUGC. 2 ♀♀, 2 deutonymphs; Longxin Township, Longling County, Yunnan Province, China ; 24°32′49.91″N, 98°49′15.67″ E, 1700

m a.s.l.; 21 Jul. 2002 ; Jianjun Guo leg.; GUGC.

Description — Male: Idiosoma with weak sclerotization, covered with fine setae ( Figure 11B ), dorsum with two pairs of irregular banded dorsalia, all glandularia on well-developed tubercles, excretory pore located in the terminal position, on a well-developed spindle-shaped tubercle ( Figure 12A ), and fused with V 1 ( Figure 12E ). Coxal plates in four groups, surface lightly reticulated, interspace between Cx-II and Cx-III narrow, suture line between Cx-III/IV incomplete, posterior apodemes of ACG extending to two-thirds of Cx-IV, posterior projection of Cx-IV forming a short extension ( Figure 12C ). Genital plates wider than long, each with 47–57 acetabula. The edge of the genital plates lined with 10 pairs of 12–14 genital setae. V 4 situated in close proximity to V 3 and positioned on the anterior side of the genital plates. Additionally, C 4 is connected to both Cx-IV and the genital palates ( Figure 12E ).

Palp five-segmented. P-1 slender, mediodorsal with one seta; P-2 with two dorsomedial

setae and one distolateral seta; P-3 with two long setae; P-4 with two developed ventral

projections, each bearing one seta, and one ventrodistal peg-like seta on a tubercle; the claws

of P-5 distinctly trifurcated ( Figure 12A ). Ventral apodeme of gnathosoma slightly as long as

dorsal apodeme, a little projection located at the base of the ventral apodeme of the gnathosoma ( Figure 12C ). Chelicera with a well-developed claw ( Figure 12D ). I-L-4, -5 ventrodistally with one, one short swimming setae, respectively ( Figure 13A ); II-L-4, -5 ventrodistally with one, two short swimming setae, respectively ( Figure 13B ); III-L-3, -4, -5 distally with one, four, three swimming setae, respectively ( Figure 13C ); IV-L-3, -4, -5 distally with two, five, three swimming setae, respectively; IV-L-6 ventrally with two blunt setae ( Figure 13D ).

Measurements — Male (n = 3): Idiosoma L 706–726, W 627–646 (L/W ratio 1.09–1.15); genital field L 173–177, W 392–397 (L/W ratio 0.44–0.45). LA 422–429; LP 236–239; medial distance between Cx-IV 9–11. Chelicera L 132–139. Gnathosoma L 102–114. Ejaculatory complex L 168–185. Lengths of the palp segments (P-1–5): 30–34, 81–85, 52–56, 75–80,

27–31. Lengths of I-L-1–6: 75–77, 118–125, 129–133, 214–227, 202–207, 163–175. Lengths

of II-L-1–6: 69–71, 112–120, 121–127, 202–215, 206–221, 175–178. Lengths of III-L-1–6: 72–77, 91–94, 92–96, 165–169, 184–195, 177–184. Lengths of IV-L-1–6: 76–94, 94–110,

124–131, 193–209, 212–228, 201–215.

Female: Similar to the male. Interspace between Cx-II and Cx-III narrow, the mid-edge spacing of Cx-IV narrow ( Figure 11D ). Genital palates separated, each with 39–49 acetabula, and the plate possesses nine genital setae ( Figure 12F ).

Measurements — Female (n = 3): Idiosoma L 742–856, W 626–768 (L/W ratio 1.19–1.37); genital field L 142–177, W 127–145 (L/W ratio 0.98–1.39); gonopore L 155–203. LA 432–

516; LP 249–312; medial distance between Cx-IV 11–20. Chelicera L 154–160. Gnathosoma

L 121–124. Lengths of the palp segments (P-1–5): 34–38, 87–101, 57–65, 96–99, 34–43. Lengths of I-L-1–6: 83–92, 125–143, 133–163, 235–274, 220–231, 173–190. Lengths of II-L-1–6: 80–86, 101–141, 104–150, 182–263, 207–250, 191–196. Lengths of III-L-1–6: 78–

91, 100–111, 95–114, 185–198, 200–220, 193–209. Lengths of IV-L-1–6: 97–102, 113–128, 139–153, 218–237, 242–260, 218–242.

Deutonymph: The deutonymph mites share similarities with adult overall, with the following distinctions: posterior apodemes of ACG extending to one-third of Cx-IV (Figure

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

14B). Excretory pore away from V 1 ( Figure 14D ). P-1 without seta, P-2 with two dorsal setae ( Figure 14C ). III-L-3, -4, -5 distally with one, one, two swimming setae, respectively (Figure

15C); IV-L-3, -4, -5 distally with one, three, two swimming setae, respectively ( Figure 15D ). Measurements — Deutonymph (n = 2): Idiosoma L 379–497, W 324–435 (L/W ratio

0.87–1.53); genital field L 76–100, W 169–184 (L/W ratio 0.41–0.59). LA 217–226; LP

121–126; medial distance between Cx-IV 19–46. Chelicera L 93–98. Gnathosoma L 60–74. Lengths of the palp segments (P-1–5): 20–21, 49–50, 32–34, 52–54, 25–28. Lengths of

I-L-1–6: 46–50, 65–67, 74–76, 124–126, 124–126, 119–124. Lengths of II-L-1–6: 46–49,

64–69, 70–72, 115–116, 126–135, 119–121. Lengths of III-L-1–6: 45–46, 54–56, 54–60,

95–97, 117–118, 122–124. Lengths of IV-L-1–6: 53–60, 61–64, 73–75, 118–119, 135–141,

136–137.

Remarks — The structure of the female genital plates and the palp in the new species exhibit similarities to those found in the subgenus Ecpolopsis Piersig. However , unlike the glandularia on the dorsum of this species, the latter subgenus has large glandularia plates, and the genital plates do not display fused and enlarged glandularia. Therefore, it is assigned to the subgenus Soarella . It is speculated that this species represents an intermediate form between

the subgenus Ecpolopsis and the subgenus Soarella , allowing for clear differentiation from

other members of the subgenus Soarella .

Distribution — China (Yunnan Province), standing waters.

Figures

Figure 11 Neumania (Soarella) acanthophora sp. nov. (Male A–C; Female D): A. Idiosoma, dorsal view; B. Mesh pattern of Idiosoma; C, D. Idiosoma, ventral view; Scale bars = 100 μm.

Figure 12 Neumania (Soarella) acanthophora sp. nov. (Male B–E; Female A, F): A, B. Palp; C. Gnathosoma; D. Chelicera; E, F. Genital Field; Scale bars = 100 μm.

Figure 13 Neumania (Soarella) acanthophora sp. nov. (Male A–D): A. I-L-1–6; B. II-L-1–6; C. IIIL-1–6; D. IV-L-1–6; Scale bars = 100 μm.

Figure 14 Neumania (Soarella) acanthophora sp. nov. (Deutonymphs A–D): A. Idiosoma, dorsal view; B. Idiosoma, ventral view; C. Palp; D. Genital Field; Scale bars = 100 μm.

Figure 15 Neumania (Soarella) acanthophora sp. nov. (Deutonymphs A–D): A. I-L-1–6; B. II-L-