Torrenticola spinextension Gu & Guo, 2020

Gu, Xin-Yao, Jin, Dao-Chao & Guo, Jian-Jun, 2020, Three new species and one new record of Torrenticolidae (Acari, Hydrachnidia) from Wuyishan with an updated key for Chinese fauna, European Journal of Taxonomy 625, pp. 1-23 : 7-11

Torrenticola spinextension Gu & Guo sp. nov.

urn:lsid:zoobank.org:act:2CAE5F0A-B477-4CE0-B712-3F609A7B6284

Figs 5–8

Diagnosis

Idiosoma elliptical; dorsal plate arrangement: 4+1; infracapitular bay narrow U-shaped; V 1 anterior to V 2, V 2 almost at the same level of Ap; P-2 with a laterally compressed, apically serrated and spine-like ventrodistal extension.

Etymology

Named after the shape of ventral extension on P-2. The specific name is from Latin words “ spina ” (thorn), there we used “ spin -” and “ extension ” (extension or prolongation); used as a noun in apposition.

Material examined

Holotype

China • ♂; Wuyishan ; 27°40′54″ N, 117°47′31″ E, 311 m a.s.l.; 4 Aug. 2018; X.Y. Gu leg.; FJ-TO-20180804.

Paratype

China • 1 ♀; same collection data as for holotype; FJ-TO-20180805 . Description

Male (n = 1)

BODY. Idiosoma elliptical, L/W ratio 1.5 ( Fig. 5B ). Dorsal plate arrangement: 4+1 ( Fig. 5A ). Infracapitular bay U-shaped, Cx-II–III mL relatively long; E 4 on same line with 4 th pair of acetabula; V 1 anterior to V 2, V 2 slightly rostral to Ap ( Fig. 5B ). Ejaculatory complex with well-developed anterior keel and proximal arms ( Fig. 5C ). Gnathosoma dorsal apodeme short and pointed, ventral apodeme long and wide ( Fig. 5D ). Palp: P-1 long, with one dorsal seta; P-2 short and wide, with three dorsal setae, laterally compressed, apically serrated and spine-like ventrodistal extension, one very short seta laterally at the base of extension; P-3 with two dorsal setae, and one ventral seta on ventral prolongation; P-4 with one tiny dorsal seta and two ventral extensions, bearing one long and three short setae ( Fig. 6A ). Legs I–IV as shown in Fig. 6 B–E: the claw of Leg-I damaged.

MEASUREMENTS. Idiosoma L 635, W 429. Dorsal shield L 520, W 479, dorsal plate L 479, frontal platelets L 104, shoulder platelets L 157. Infracapitular bay depth 136; Cx-I L 228, mL 92, Cx-II–III mL 110; Gf L 140, W 112, distance between Gf and Ap 108. Gnathosoma vL 296, dL 230, chelicera bs L 305, claw L

50. Ejaculatory complex ( Fig. 5C ), L 206, aL 139, W 92. L of palp segments: P-1, 32; P-2, 102; P-3, 50; P-4, 101; P-5, 22. L of leg segments: I-L-1–6: 41, 86, 72, 84, 90, 91; II-L-1–6: 37, 82, 65, 82, 95, 109; III-L-1–6: 49, 82, 73, 100, 114, 130; IV-L-1–6: 102, 86, 106, 123, 143, 155.

Female (n = 1)

BODY. Body features same as male except: dorsal plate with reddish or dark purple pattern at anterior and posterior parts; location of muscle scars posterior to male; E 4 on same line with 5 th pair of acetabula; line of primary sclerotization farther ahead D 3 and D 4.

MEASUREMENTS. Idiosoma L 731, W 487. Dorsal shield L 577, W 427; dorsal plate L 538; frontal platelets L 117; shoulder platelets L 175. Infracapitular bay depth 161; Cx-I L 267, mL 106, Cx-II–III mL 69; Gf L 150, W 122, distance between Gf and Ap 155. Gnathosoma vL 330, dL 256, chelicera bs L 338, claw L 66. L of palp: P-1, 35; P-2, 127; P-3, 62; P-4, 118; P-5, 19. L of leg segments: I-L-1–6: 39, 64, 78, 95, 98, 96; II-L-1–6: 36, 85, 66, 89, 105, 118; III-L-1–6: 45, 71, 79, 108, 123, 135; IV-L-1–6: 123, 98, 114, 148, 157, 158.

Distribution

China (Wuyishan).

Habitat

Streamlet.

Remarks

By having a laterally compressed, apically serrated and spine-like ventrodistal extension on P-2, and one very short seta laterally at the base of extension, this new species is similar to T. borneoensis Pešić & Smit, 2014 ( Pešić & Smit 2014). But there are obvious differences: dorsal plate arrangement is 4+ 1 in T. spinextension (2+ 1 in T. borneoensis ); ventral extension of P-3 is smooth in T. spinextension (serrate in T. borneoensis ); two ventral extensions on P-4 are close to each other in T. spinextension (markedly apart from each other in T. borneoensis ).

Figures

Fig. 5. Torrenticola spinextension Gu & Guo sp. nov., ♂, holotype (FJ-TO-20180804). A. Dorsal view. B. Ventral view. C. Ejaculatory complex. D. Infracapitulum and chelicera. Scale bars = 100 μm.

Fig. 6. Torrenticola spinextension Gu & Guo sp. nov., ♂, holotype (FJ-TO-20180804). A. Palp, lateral view. B. leg-I. C. leg-II. D. leg-III. E. leg-IV. Scale bar = 100 μm.

Fig. 7. Torrenticola spinextension Gu & Guo sp. nov., ♀, paratype (FJ-TO-20180805). A. Dorsal view. B. Ventral view. C. Palp, lateral view. D. Infracapitulum and chelicera. Scale bars = 100 μm.

Fig. 8. Torrenticola spinextension Gu & Guo sp. nov., ♀, paratype (FJ-TO-20180805). A. leg-I. B. leg- II. C. leg-III. D. leg-IV-1–4. E. leg-IV-5–6. Scale bar = 100 μm.