New Species Of Water Mites From New Guinea (Acari: Hydrachnidia, Halacaridae) Author Smit, H. text Acarologia 2011 2011-09-23 51 3 321 345 http://dx.doi.org/10.1051/acarologia/20112017 journal article 10.1051/acarologia/20112017 2107-7207 5392556 Australiobates (Australiobates) reticulatus Wiles, 1997 Material examined — 2/3/0, Bion River, Pass Valley, 3°51.267’ S ; 139°05.789’ E , alt. 1955 m a.s.l., 11-iii-2010 ; 0/1/0, Mulun stream, Pass Valley, 3°51.599’ S ; 139°05.876’ E , alt. 1970 m a.s.l., 12-iii-2010 ; 0/2/0, Bion River, upstream, Pass Valley, 3°51.513’ S ; 139°05.570’ E , alt. 2007 m a.s.l., 15- iii-2010 ; 0/1/0, Uwe River, Wamena, 4°06.521’ S ; 138°56.310’ E , alt. 1668 m a.s.l., 24-iii-2010 . Remarks — Wiles (1997a) named the species A. reticulata , but as the gender of the genus is masculine, the name should be A. reticulatus . The species has been reported previously from Papua New Guinea and Papua province (" Irian Jaya "), Indonesia ( Wiles 1997a ). Australiobates (Australiobates) setosus n. sp. ( Figure 11 ) Material examined — Holotype female, Maraut River , Vogelkop , New Guinea , 3-xii-1996 , leg. M. Argeloo. Diagnosis — Ventral margin of PIV with 3-4 stiff, thin setae, besides the two stout setae. Description — Female. Idiosoma 526 long dorsally and 421 wide, ventral length 583. Idiosoma without platelets or reticulation. Gnathosoma with a long anchoral process. Coxoglandularia 4 near suture line of third and fourth coxal plates. Posterior apodemes of fourth coxal plates long ( Figure 11a ). Genital field with three pairs of acetabula, these occupying most of the area of the genital field and lying in an arc. Lengths of PI-PV: 38, 90, 124, 134, 34. PIV slender, ventral margin of PIV with 3-4 stiff, thin setae, besides the two stout setae. PII and PIII with 3-4 short, stout setae near or on dorsal margin ( Figures 11b, 11c ). Lengths of I-leg-4-6: 227, 267, 143. I-leg-5 anteroventrally with two closely inserted, relatively blunt setae ( Figure 11d ). Lengths of IV-leg-4-6: 324, 318, 198. All legs with numerous short, fine setae, swimming setae absent. Male: Unknown. Etymology — Named for the relatively many setae on PIV . Remarks — The new species is somewhat close to A. bruijni Wiles, 1997 , but this species lacks the stiff setae of the ventral margin of PIV , and the genital field is more slender, with the posterior acetabulum not extending posteriorly of the gonopore. Australiobates (Australiobates) sylvestris n. sp. ( Figure 12 ) Material examined — Holotype female, small forest stream near UNCEN (= Cenderawasih University), Abepura, Papua province, New Guinea , Indonesia , 2°34.794’ S ; 140°39.292’ E , alt. 234 m a.s.l. , 31-iii-2010 . Paratypes : one male , 2 females , same data as holotype . Diagnosis — I-leg-5 anteroventrally with two pointed setae; PIV ventrally with two blunt setae. Description — Female: Idiosoma 575 (494 – 559) long and 445 (421 – 470) wide (measured dorsally). Idiosoma without platelets or reticulation. Gnathosoma with a long anchoral process (somewhat shifted in the illustrated holotype as a result of mounting). Coxoglandularia 4 near suture line of third and fourth coxal plates. Posterior apodemes of fourth coxal plates long ( Figure 12a ). Genital field 116 long, with three pairs of acetabula, these occupying most of the area of the genital field and lying in an arc. Lengths of PI-PV: 38, 76, 104, 100, 28; PIV ventrally with two well separated, blunt setae ( Figure 12b ). Lengths of I-leg-4-6: 160, 168, 110; I-leg-5 anteroventrally with two pointed setae ( Figure 12c ). Lengths of IV-leg-4-6: 251, 275, 160. Swimming setae absent. Male: Idiosoma 380 long and 300 wide (measured dorsally). Idiosoma without platelets or reticulation. Idiosoma without platelets or reticulation. Gnathosoma with a long anchoral process. Coxoglandularia 4 near suture line of third and fourth coxal plates. Posterior apodemes of fourth coxal plates long. Genital field 70 long and 74 wide, with three pairs of acetabula, anteriorly with 3-4 small setae ( Figure 12d ). Lengths of PI-PV: 26, 48, 64, 66, 18; palp as in female. Lengths of I-leg-4-6: 104, 110, 80. Lengths of IV-leg-4-6: 170, 182, 108. Legs as in female. FIGURE 11: Australiobates setosus n. sp. , holotype female: a – ventral view; b – palp; c – palp; d – I-leg-5-6. Scale bar = 50 µm. Etymology — Named for its occurrence in the forest. Remarks — No other Australiobates species from New Guinea has I-leg-5 with anteroventral acute setae and PIV with blunt setae. The only Australian species with the combination of these characters are A. ombatus Cook, 1986 ( PIV more slender and PV has large downturned setae) and A. rudagus Cook, 1986 ( PIV with heavy ventral setae).