New records of water mites of the family Limnesiidae Thor from Australia (Acari: Hydrachnidia), with the description of seven new species Author Smit, Harry Naturalis Biodiversity Center, P. O. Box 9517, 2300 RA Leiden, the Netherlands. text Acarologia 2022 2022-02-07 62 1 193 222 https://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4504 journal article 10.24349/yu9v-w0lf 2107-7207 7160186 Limnesia ( Limnesia ) elongata sp. nov. Zoobank: 438702C7-2E70-4B3A-A155-D740227A7500 ( Figure 2 A-D) Figure 2 Limnesia ( Limnesia ) elongata sp. nov . , holotype female. A – dorsum; B – venter; C – palp; D – IV – leg-4-6. Scale bars: A-B = 100 µm, C-D = 50 µm. Material examined — Holotype female, Booloumba Creek at picnic area, hyporheic, Conondale National Park , Queensland , Australia , 26°38.686′ S 152°39.013′ E , 144 m a.s.l, 19 Nov. 2014 ( QM ). Diagnosis — Idiosoma elongated; posteromedial dorsal platelet absent; Cx-I medially separated; Cxgl-4 lying in a bifurcation of suture lines of Cx-III/IV; Vgl-1 posterior to Vgl-3; P4 with distinct setal tubercles. Description — Female: Idiosoma elongated ( Figure 2A ), dorsally 648 long and 348 wide, ventrally 689 long. Dorsum without a posteromedial dorsal platelet, postocularia on small platelets. Cx-I medially separated. Apodemes of anterior coxae short, extending onto Cx-III. Cxgl-4 lying in a bifurcation of suture line of Cx-III/IV; associated setae lying on Cx-III close to Cxgl-4 ( Figure 2B ). Genital field 150 long, with three pairs of acetabula. Vgl-1 posterior to Vgl-3. Length of P1-5: 22, 54, 77, 124, 44. P2 with a peg-like seta, P4 ventrally with distinct setal tubercles, the posterior tubercle larger than the anterior tubercle; P5 slender ( Figure 2C ). Length of I-leg-4-6: 120, 140, 130. Length of IV-leg-4-6: 142, 172, 168; terminal seta of IV-leg-6 94 long ( Figure 2D ). All leg segments slender, swimming setae absent. Remarks — The only two Australian Limnesia species without swimming setae and with little dorsal sclerotization are L. ugava Cook, 1986 and L. brinvoza Cook, 1986 . The new species differs from L. ugava in the medially separated Cx-I, from L. brinvoza in the absence of the small dorsalia, the elongated idiosoma and more slender palp segments (especially P2 and P3).