Paratryssaturus montanus, Smit & Pešić, 2020

Smit, Harry & Pešić, Vladimir, 2020, New records of water mites from New Zealand, with the description of three new genera and ten new species (Acari: Hydrachnidia), Acarologia 60 (4), pp. 903-950 : 937

Paratryssaturus montanus n. sp.

Zoobank: E55CF9EC-93AA-4CFD-8513-9A4C9729AC37

( Figures 22 A­F, 23A­E)

Material examined. Holotype male, Twin Creek, Arthur’s Pass National Park, South Island New Zealand, 42°54.715 ′ S 171°33.535 ′ E, alt. 877 m asl, 5­iii­2020 (NMNZ). Paratypes: three females (NMNZ), two females, (RMNH), same data as holotype.

Diagnosis. Gonopore of male narrow and tapering posteriorly, IV­leg­5 of male with a dorsal angular hump. Idiosoma of female relatively broad, gonopore slender.

Description. Male: Idiosoma reticulate without papillae, dorsally 353 long and 264 wide, ventrally 409 long. Dorsum with a large unpaired and reticulated, anterior plate with the postocularia, 125 long, 163 wide, and a somewhat large posterior plate with two pairs of glandularia, 161 long and 170 wide. Moreover, dorsum with two pairs of lateral platelets, anterolateral platelets each with a glandularium, 137 long. Between posterior dorsal plate and laterodorsal platelets a pair of “free” glandularia. Cxgl­4 located near suture line of Cx­III/IV. Posterior margin of Cx­IV incomplete. Projections associated with insertions of fourth leg relatively large and rounded. Between insertions of fourth legs and genital field a pair of glandularia. Genital field large with numerous acetabula. Gonopore 31 long, narrow and tapering posteriorly. Excretory pore ventrally. Length of P1­5: 21, 47, 23, 55, 30. P2 anteroventrally with a few small papillae, P4 with a ridge in anterior half of segment. Length of I­leg­4­6: 55, 63, 77. Length of IV­leg­4­6: 66, 72, 78. IV­leg­5 stocky, with a dorsal angular hump, anteroventrally with a spoon­shaped seta.

Female: In most characters similar as male, except genital field and fourth leg. Idiosoma dorsally 403 long and 300 wide, ventrally 456 long. Length/width of anterodorsal plate 134/175, length/width of posterodorsal plate 205/193 length of anterolateral platelet 153. Gonopore 54 long, somewhat elongated, distanced from posterior idiosoma margin. Excretory pore ventrally near posterior idiosoma margin. Length of P1­5: 20, 48, 23, 55, 30. Palp as in male. Length of I­leg­4­6: 55, 61, 73. Length of IV­leg­4­6: 68, 77, 81. IV­leg­5 not modified.

Etymology. Named for its occurrence in the mountains.

Remarks. The male of the new species is distinguished easily from other Paratryssaturus species by the shape of IV­leg­5, in the other three species IV­leg­5 is rounded dorsally and not angular. The female of the new species is most similar to P. minutus (Hopkins) due to the position of the excretory pore near the posterior idiosoma margin, but the idiosoma of the new species is less slender, and the gonopore is more slender. However, the female of P. zodelus Cook is not known with certainty.