Pseudohydryphantes chilensis, Smit, 2021

Smit, Harry, 2021, New records of water mites from Chile (Acari: Hydrachnidia), with the description of three new species, Acarologia 61 (2), pp. 274-290 : 275-277

Pseudohydryphantes chilensis n. sp.

Zoobank: 2EB4EDFD-6354-4674-9DCD-1CB97771AB01

( Figure 1 A­E)

Material examined. Holotype male, small stream crossing road W­480, W of Pidpid, prov. Chiloé, Chile, 42°23.545 ′ S 73°51.911 ′ W, 100 m a.s.l., 21 Dec. 2018 ( RMNH).

Diagnosis. Glandularia sclerites small, not crescent shaped; legs without swimming setae.

Description. Male: Idiosoma reticulate with large papillae, dorsally 535 long and 348 wide,

ventrally 559 long. Glandularia sclerites smaller than accompanying glandularia, rounded

( Figure 1A ). Median eye and postocularia on small platelets, the latter more or less between

Dgl­3. Chelicera 211 long. Coxae in four groups, with few small setae; tip of Cx­I with two small, stout setae. Genital field with three pairs of acetabula, genital flap 164 long; along medial margin a row of small setae ( Figure 1B ). Excretory pore sclerotized. Length of P1­5: 47, 72, 48, 96, 36. P2 and P3 with a medial seta and three and one dorsal setae, respectively.

P4 with a stout dorsodistal setae ( Figure 1D ). Length of I­leg­4­6: 100, 120, 124. Length of IV­leg­4­6: 170, 180, 136. Legs without swimming setae ( Figure 1E ). Claw of legs simple, without serrations or ventral clawlet, but with a small dorsal clawlet.

Female: Unknown.

Etymology. Named after the country of the type locality.

Remarks. This is the first Pseudohydryphantes species from South America. The new species differs from all known Pseudohydryphantes species in the absence of swimming setae. From North America two species are known, both insufficiently described by Marshall (1924, 1929). Main difference with the new species is the presence of swimming setae in the North American species.

Figures

Figure 1 Pseudohydryphantes chilensisn. sp., holotype male. A – dorsum; B – venter; C – chelicera; D – palp; E – IV­leg­4­6. Scale bars: A­B = 100 µm; C­E = 50 µm.