Torrenticola brevisuturae Gu & Guo, 2022

Gu, Xinyao, Xiao, Haichuan, Jin, Daochao & Guo, Jianjun, 2022, Integrative approach of morphology and geometric morphometrics to species delimiation in Torrenticolidae (Acari: Hydrachnidiae), Zoological Systematics 47 (2), pp. 117-131 : 123-125

publication ID	https://doi.org/ 10.11865/zs.2022203
publication LSID	lsid:zoobank.org:pub:95BC1F6B-EA40-4831-8DB1-4B4EE6E917D5
persistent identifier	https://treatment.plazi.org/id/6B23AA7F-FFE5-FF95-CFA5-FED4A0EDFDD9
treatment provided by	Felipe
scientific name	Torrenticola brevisuturae Gu & Guo
status	sp. nov.

Treatment

Torrenticola brevisuturae Gu & Guo , sp. nov. ( Figs 9–12 View Figure 9 View Figure 10 View Figure 11 View Figure 12 )

Material examined. Holotype male, SX-TO-20181101, Pangquangou National Nature Reserve, Shanxi, China (37°48′3′′N, 111°28′25′′E, elev. 1670 m), 11 Nov. 2018, coll. Haichuan Xiao, Zhuhui Ding. Paratype. 0/1/0, SX-TO-2018 1102, same data as holotype GoogleMaps .

Diagnosis. Idiosoma elliptical, L/W ratio 1.4–1.5; E 4 at same level as 6th pair of acetabula; rostrum short, dorsal apodeme short, ventral apodeme slender; posterior margin of infracapitulum straight.

Description. Male (n = 1). Idiosoma elliptical, L 748, W 554, L/W ratio 1.4 ( Fig. 9B View Figure 9 ). Dorsal plate arrangement 4+1 ( Fig. 9A View Figure 9 ); dorsal shield L 702, W 559, dorsal plate L 669, frontal platelets L 134, W 55, shoulder platelets L 211, W 80. Infracapitular bay U-shaped, depth 180; Cx-I L 313, mL 134, Cx-II+III mL 38; Gf L 182, W 179; E 4 at same level as 6th pair of acetabula; V 1 anterior to V 2, V 2 almost at same level of Ap; distance between Gf and Ap 163 ( Fig. 9B View Figure 9 ). Infracapitulum ( Fig. 9D View Figure 9 ): dL 247, vL 315, rostrum short, dorsal apodeme short, ventral apodeme slender, posterior margin of infracapitulum straight, chelicera bs L 356, claw L 45. Palp ( Fig. 9C View Figure 9 ): P-1 long, with one dorsodistal seta; P-2 with three dorsal setae, one smooth ventral projection, and one ventral seta at base of ventral projection; P-3 with one short dorsal seta and one long dorsodistal seta, one ventral seta at base of ventral projection; P-4 with two dorsal, one dorsodistal and one mediodistal setae, and with one ventral extension, on which with three ventral setae. L of palp segments: P-1, 39; P-2, 114; P-3, 67; P-4, 88; P- 5, 17. Legs ( Figs 10A–C, E View Figure 10 ). L of leg segments: I-L-1–6: 66, 97, 86, 97, 86, 82; II-L-1–6: 59, 102, 79, 105, 127, 144; III-L- 1–6: 77, 107, 91, 129, 154, 162; IV-L-1–6: 129, 105, 134, 158, 183, 155. Ejaculatory complex ( Fig. 10E View Figure 10 ), L 224, aL 175.

Female (n = 1). Body features same as male except: idiosoma, L 843, W 634, L/W ratio 1.5 ( Fig. 11B View Figure 11 ). Dorsal shield L 702, W 559, dorsal plate L 669, frontal platelets L 135, W 55, shoulder platelets L 212, W 81. Infracapitular bay, depth 180; Cx-I L 313, mL 134, Cx-II+III mL 38; Gf L 181, W 179, distance between Gf and Ap 193. Infracapitulum ( Fig. 11D View Figure 11 ): dL 247, vL 315, chelicera bs L 356, claw L 45. Palp ( Fig. 11C View Figure 11 ): P-2 with three dorsal, one dorsodistal setae and one long ventral seta at base of ventral projection; P-4 with two dorsodistal and one mediodistal setae, and with a ventral extension, on which with three ventral setae. L of palp segments: P-1, 39; P-2, 114; P-3, 67; P-4, 92; P-5, 21. Legs ( Fig. 12 View Figure 12 ): L of leg segments: I-L-1–6: 69, 106, 88, 101, 92, 99; II-L-1–6: 72, 99, 85, 114, 131, 139; III-L-1–6: 69, 116, 92, 135, 162, 175; IV-L-1–6: 135, 117, 134, 173, 193, 185.

Habitat. Streamlet, about 3–4 m wide, 0.5 m depth, with many small stones at the bottom.

Remarks. By having a straight posterior margin of infracapitulum, a short dorsal apodeme, a slender ventral apodeme, a short rostrum, the new species is similar to T. bomiensis , but different by: (1) P-2 with a smooth projection, while with a serrated projection in T. bomiensis ; (2) P-4 with one ventral extension, while with two ventral extensions in T. bomiensis .

By the CVA and cluster analysis, the new species (group III in Table 1) is significantly different with T. bomiensis (group IV in Table 1) in the anterior margins of coxae and dorsoglandularia 1–4, which indicates they are different species. However, the analysis of infracapitulum was not statistically significant, which means both species have similar infracapitulum. This is consistent with their morphological description (Cook, 1966; Pešić & Smit, 2014).

Etymology. The specific name is from Latin words “ brevis ” (short, little, small) and “ suturae ” (seam, stitch), referring to Cx-II+III mL short; used as a noun in apposition.

Distribution. China (Shanxi).