Momoniella rubripes, Orginal, 2021

Orginal, Harry Smit, 2021, The water mites of Western Australia (Acari: Hydrachnidia), with the description of 13 new species, Acarologia 61 (4), pp. 928-966 : 963

Momoniella rubripes n. sp.

Zoobank: 25A00C3B-39BE-49F3-83A8-34909B14537C

( Figures 19 A-F)

Material examined — Holotype male, Glenoran Pool , W of Glenoran, Western Australia, Australia, 34°12.979′ S 115°56.436′ E, alt. 160 m asl, 8 Feb. 2019 ( WAM) . Paratypes:

one female ( WAM), one male [juvenile], one female ( RMNH) same data as holotype ; one male, Rowell’s Pool, Mount Frankland South NP, Western Australia, Australia, 34°49.120′ S 116°35.657′ E, 34 m asl, 6 Feb. 2019 ( RMNH).

Other material: Two deutonymphs, same data as holotype.

Diagnosis — Idiosoma colour red, posterior margin of Cx-IV short, dorsal shield without glandularia, male gonopore relatively wide, in female acetabula covering only a small part of gonopore.

Description — Male: Idiosoma rugose, colour red, especially chitinized parts and legs, dorsally 535 (486) long and 567 (502) wide, ventrally 611 (559) long. Dorsal shield 405 (373) long and 393 (340) wide, with the postocularia located near anterior margin, lateral margin undulating. Five pairs of glandularia flanking the dorsal shield, the dorsal shield itself without glandularia ( Figure 19A). Anterior coxae projecting, suture lines of coxae incomplete, posterior margin of Cx-IV short, medial margin of Cx-IV angular. Coxae with longitudinal ridges. Projections associated with insertions of fourth legs lobe-like. A short ridge present posteromedial of insertions of fourth legs ( Figure 19B). Gonopore 76 long and 38 wide, with three pairs of acetabula; gonopore wide, leaving a large space between the rows of acetabula. Length of P1-5: 24, 40, 30, 38, 26 (palp not lying flat in the slide, so measurements not accurate). P4 stocky, ventrally with a pointed, stout seta, P5 bifurcated ( Figure 19C). Length of I-leg-4-6: 98, 212, 96. I-leg-5 elongated, I-leg-6 with a blunt distal claw, one of the setae elongated ( Figure 19F). Length of IV-leg-4-6: 136, 192, 164 (till tip of segments). IV-leg-5

with two swimming setae, III-leg-5 with one swimming seta.

Female: In all aspects similar to male, except measurements and genital field. Idiosoma dorsally 616 (567) long and 624 (591) wide, ventrally 688 (652) long. Dorsal shield 454 (510) long and 425 (405) wide. Gonopore 154 long and 106 wide, the three pairs of acetabula covering only a small part of the gonopore ( Figure 19E). Length of P1-5: 24, 43, 29, 38, 32.

Palp as in male ( Figure 19D). Length of I-leg-4-6: 100, 222, 102. First leg as in male, but ventral teeth of claw of I-leg-6 better visible. Length of IV-leg-4-6: 138, 178, 160. Legs as in male, but III-leg-4 of one female with three swimming setae, and III-leg-5 with two swimming setae.

Remarks — In the two known Australian species, i.e. Momoniella australica, 1986 and M. parva Cook, 1986, the acetabula of the males are lying medially much closer to each other, leaving no space between the rows of acetabula. Moreover, the reddish idiosoma colour of the new species differs from the more yellowish idiosoma colour of the two known species.